Mercurial > repos > petr-novak > dante_ltr
annotate R/ltr_utils.R @ 3:6ae4a341d1f3 draft
"planemo upload commit 8bd6029a4de4a8f5031a5cc71303bb06217cc88a"
author | petr-novak |
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date | Tue, 03 May 2022 12:38:12 +0000 |
parents | f131886ea194 |
children | c33d6583e548 |
rev | line source |
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0
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1 add_coordinates_of_closest_neighbor <- function(gff) { |
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2 gff <- gff[order(seqnames(gff), start(gff))] |
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3 # split to chromosomes: |
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4 gff_parts <- split(gff, seqnames(gff)) |
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5 upstreams <- c(sapply(gff_parts, function(x) c(1, head(end(x), -1)))) |
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6 downstreams <- c(sapply(gff_parts, function(x) c(start(x)[-1], seqlengths(x)[runValue(seqnames(x[1]))]))) |
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7 gff_updated <- unlist(gff_parts) |
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8 gff_updated$upstream_domain <- unlist(upstreams) |
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9 gff_updated$downstream_domain <- unlist(downstreams) |
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10 names(gff_updated) <- NULL |
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11 return(gff_updated) |
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12 } |
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13 |
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14 get_domain_clusters <- function(gff) { |
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15 # get consecutive domains from same linage |
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16 # must be sorted! |
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17 gag_plus <- as.numeric(cumsum(gff$Name == "GAG" & strand(gff) == '+')) |
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18 gag_minus <- rev(as.numeric(cumsum(rev(gff$Name == "GAG" & strand(gff) == '-')))) |
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19 # split based on classification - must be same and consecutive |
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20 x <- rle(gff$Final_Classification) |
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21 # split on strand change |
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22 s <- rep(seq_along(runLength(strand(gff))), runLength(strand(gff))) |
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23 domain_cluster <- paste0(rep(seq_along(x$lengths), x$lengths), "_", seqnames(gff), |
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24 "_", gag_plus, "_", gag_minus, "_", s) |
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25 gff_clusters <- split(as.data.frame(gff), factor(domain_cluster, levels = unique(domain_cluster))) |
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26 gff_clusters |
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27 } |
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28 |
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29 clean_domain_clusters <- function(gcl) { |
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30 ## remove clusters wich does not have enough domains or domains |
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31 ## are on different strand |
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32 N_domains <- sapply(gcl, nrow) |
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33 N_unique_domains <- sapply(gcl, function(x)length(unique(x$Name))) |
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34 S <- sapply(gcl, function(x)paste(sort(unique(x$strand)), collapse = " ")) |
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35 S_OK <- S %in% c("+", "-") |
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36 min_domains <- 5 |
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37 maxlength <- 15000 # max span between domains |
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38 span <- sapply(gcl, function(x)max(x$end) - min(x$start)) |
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39 cond1 <- S_OK & |
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40 N_unique_domains == N_domains & |
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41 N_domains >= min_domains & |
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42 span <= maxlength |
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43 return(gcl[cond1]) |
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44 } |
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45 |
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46 check_ranges <- function(gx, s, offset = OFFSET) { |
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47 # check is range is not out of sequence length |
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48 START <- sapply(gx, function(x)min(x$start)) - offset |
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49 END <- sapply(gx, function(x)max(x$end)) + offset |
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50 MAX <- seqlengths(s)[sapply(gx, function(x)as.character(x$seqnames[1]))] |
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51 good_ranges <- (START > 0) & (END <= MAX) |
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52 return(good_ranges) |
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53 } |
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54 |
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55 get_ranges <- function(gx, offset = OFFSET) { |
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56 S <- sapply(gx, function(x)min(x$start)) |
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57 E <- sapply(gx, function(x)max(x$end)) |
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58 gr <- GRanges(seqnames = sapply(gx, function(x)x$seqnames[1]), IRanges(start = S - offset, end = E + offset)) |
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59 } |
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60 |
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61 get_ranges_left <- function(gx, offset = OFFSET, offset2 = 300) { |
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62 S <- sapply(gx, function(x)min(x$start)) |
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63 max_offset <- S - sapply(gx, function(x)min(x$upstream_domain)) |
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64 offset_adjusted <- ifelse(max_offset < offset, max_offset, offset) |
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65 gr <- GRanges(seqnames = sapply(gx, function(x)x$seqnames[1]), IRanges(start = S - offset_adjusted, end = S + offset2)) |
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66 return(gr) |
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67 } |
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68 |
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69 get_ranges_right <- function(gx, offset = OFFSET, offset2 = 300) { |
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70 E <- sapply(gx, function(x)max(x$end)) |
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71 max_offset <- sapply(gx, function(x)max(x$downstream_domain)) - E |
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72 offset_adjusted <- ifelse(max_offset < offset, max_offset, offset) |
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73 gr <- GRanges(seqnames = sapply(gx, function(x)x$seqnames[1]), IRanges(start = E - offset2, end = E + offset_adjusted)) |
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74 return(gr) |
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75 } |
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76 |
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77 firstTG <- function(ss) { |
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78 x <- matchPattern("TG", ss) |
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79 if (length(x) == 0) { |
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80 return(0) |
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81 }else { |
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82 return(min(start(x))) |
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83 } |
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84 } |
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85 |
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86 lastCA <- function(ss) { |
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87 x <- matchPattern("CA", ss) |
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88 if (length(x) == 0) { |
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89 return(0) |
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90 }else { |
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91 return(max(start(x))) |
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92 } |
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93 } |
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94 |
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95 |
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96 |
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97 trim2TGAC <- function(bl) { |
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98 for (i in 1:nrow(bl)) { |
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99 cons <- consensusString(c(bl$qseq[i], bl$sseq[i]), ambiguityMap="?") |
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100 tg_P <- firstTG(cons) |
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101 ca_P <- lastCA(cons) |
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102 e_dist <- bl$length[i] - ca_P |
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103 max_dist = 50 # was 25 |
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104 no_match <- any(tg_P == 0, ca_P == 0) |
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105 if (!no_match & |
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106 tg_P < max_dist & |
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107 e_dist < max_dist) { |
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108 ## trim alignment |
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109 bl[i,] <- trim_blast_table(bl[i,], tg_P, e_dist - 1) |
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110 } |
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111 |
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112 } |
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113 return(bl) |
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114 } |
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115 |
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116 trim_blast_table <- function(b, T1, T2) { |
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117 b$qstart <- b$qstart + T1 |
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118 b$sstart <- b$sstart + T1 |
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119 b$qend <- b$qend - T2 |
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120 b$send <- b$send - T2 |
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121 b$sseq <- substring(b$sseq, T1, b$length - T2) |
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122 b$qseq <- substring(b$qseq, T1, b$length - T2) |
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123 b$length <- nchar(b$sseq) |
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124 return(b) |
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125 } |
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126 |
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127 blast_all2all <- function(seqs, db=NULL, ncpus=1, word_size=20, perc_identity=90, max_target_seq = 5000, task = "megablast", additional_params= ""){ |
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128 if (ncpus == 1){ |
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129 query <- list(seqs) |
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130 }else{ |
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131 query <-split(seqs, round(seq(1,ncpus,length.out = length(seqs)))) |
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132 } |
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133 if(is.null(db)){ |
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134 # search against itself |
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135 db <- seqs |
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136 } |
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137 qf <-tempfile(fileext=paste0("_",1:ncpus,".fasta")) |
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138 outf <-tempfile(fileext=paste0("_",1:ncpus,".csv")) |
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139 dbf <- tempfile() |
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140 script <- tempfile() |
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141 writeXStringSet(db, dbf) |
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142 mapply(query, qf, FUN = writeXStringSet) |
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143 cols <- "qaccver saccver pident length mismatch gapopen qstart qend sstart send evalue bitscore qlen slen" |
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144 cmd_db <- paste("makeblastdb -dbtype nucl -in ", dbf) |
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145 cmd_blast <- paste("blastn -task ", task, " -word_size", word_size, |
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146 "-outfmt \"6 ", cols, "\" ", |
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147 "-perc_identity", perc_identity, " -min_raw_gapped_score 500", |
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148 "-max_target_seqs", max_target_seq, additional_params, |
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149 "-query", qf, "-db", dbf, "-out", outf, |
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150 "&" |
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151 ) |
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152 |
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153 # TODO - inspect only forward strand?? |
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154 system(cmd_db) |
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155 cmd_all <- paste(paste(cmd_blast,collapse="\n"),"\nwait") |
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156 cat(cmd_all, file = script) |
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157 system(paste("sh ", script)) |
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158 |
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159 bl_list <- lapply(outf, read.table, stringsAsFactors = FALSE, col.names = unlist(strsplit(cols, " ")), sep="\t", comment.char = "") |
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160 bl_table <- do.call(rbind, bl_list) |
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161 unlink(qf) |
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162 #unlink(outf) |
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163 unlink(dbf) |
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164 unlink(script) |
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165 return(bl_table) |
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166 } |
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167 |
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168 identify_conflicts <- function (bl){ |
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169 QL <- gsub(".+[|]", "", bl$qaccver) |
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170 SL <- gsub(".+[|]", "", bl$saccver) |
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171 id_with_conflict <- unique(c(bl$qaccver[QL != SL],bl$saccver[QL != SL])) |
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172 id_ok <- setdiff(unique(c(bl$qaccver,bl$saccver)), id_with_conflict) |
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173 single_hit <- sapply( |
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174 sapply( |
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175 split(bl$qaccver, bl$saccver), unique |
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176 ), length) == 1 |
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177 id_with_no_hits <- names(single_hit)[single_hit] # except hit to itself |
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178 return(list( |
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179 ok = id_ok, |
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180 conflict = id_with_conflict, |
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181 no_hit = id_with_no_hits) |
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182 ) |
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183 } |
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184 |
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185 |
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186 analyze_TE <- function(seqs, ncpus = 10, word_size = 20){ |
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187 blt <- blast_all2all(seqs, ncpus = ncpus, word_size = word_size, perc_identity = 90) |
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188 te_conflict_info <- identify_conflicts(blt) |
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189 blt_te_ok <- blast_table_subset(blt, te_conflict_info$ok) |
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190 te_ok_lineages <- split(blt_te_ok, |
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191 gsub( |
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192 ".+[|]", |
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193 "", |
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194 blt_te_ok$qaccver)) |
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195 gr_representative <- GRangesList(mclapply(te_ok_lineages, |
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196 FUN = get_representative_ranges, |
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197 mc.cores = ncpus |
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198 )) |
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199 seqs_representative <- getSeq(seqs, Reduce(c, gr_representative)) |
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200 names(seqs_representative) <- seqnames(Reduce(c, gr_representative)) |
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201 # TODO - add swithin group verification here, ! exclude self hits!! |
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202 |
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203 return( |
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204 list( |
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205 seqs_representative = seqs_representative, |
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206 te_conflict_info = te_conflict_info, |
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207 gr_representative = gr_representative, |
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208 blast = blt |
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209 ) |
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210 ) |
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211 } |
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212 |
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213 query_coverage <- function(blt){ |
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214 blt <- blt[blt$qaccver != blt$saccver,] |
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215 Q_lengths <- blt$qlen[!duplicated(blt$qaccver)] |
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216 names(Q_lengths) <- blt$qaccver[!duplicated(blt$qaccver)] |
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217 gr <- GRanges(seqnames = blt$qaccver, seqlengths = Q_lengths, |
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218 IRanges(start = blt$qstart, end = blt$qend)) |
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219 return(coverage(gr)) |
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220 } |
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221 |
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222 multiplicity_of_te <- function(blt){ |
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223 # exclude self to self hits and calculate coverage + mean_multiplicity of TE |
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224 # assuption is that TE which are 'identical' to other TE from the same lineage are |
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225 # likely correct |
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226 blt_no_self <- blt[blt$qaccver != blt$saccver,] |
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227 cvr <- query_coverage(blt_no_self) |
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228 L <- sapply(cvr, function(x) sum(width(x))) |
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229 C1 <- sapply(cvr, function(x) sum(as.numeric(runValue(x) >= 1) * runLength(x))) |
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230 multiplicity <- sapply(cvr, function(x) sum(as.numeric(runValue(x)) * runLength(x)))/L |
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231 data.frame(L = L, C1 = C1, multiplicity = multiplicity ) |
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232 } |
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233 |
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234 verify_based_on_multiplicity <- function(TE_info, min_coverage=0.99, min_multiplicity=3){ |
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235 blt <- TE_info$blast[TE_info$blast$qaccver %in% TE_info$te_conflict_info$ok,] |
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236 mp <- multiplicity_of_te(blt) |
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237 id_ok_mp_verified <- rownames(mp)[mp$C1/mp$L > min_coverage & mp$multiplicity >= min_multiplicity] |
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238 return(list(multiplicity = mp, |
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239 id_ok_mp_verified = id_ok_mp_verified)) |
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240 |
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241 } |
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242 |
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243 compare_TE_datasets <- function(Q, S, word_size = 20, min_coverage = 0.95, ncpus=10){ |
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244 blt <- blast_all2all(seqs = Q, db = S, ncpus = ncpus, word_size = word_size) |
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245 QL <- gsub(".+[|]", "", blt$qaccver) |
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246 SL <- gsub(".+[|]", "", blt$saccver) |
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247 id_with_conflict <- unique(c(blt$qaccver[QL != SL])) |
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248 id_ok <- setdiff(unique(blt$qaccver), id_with_conflict) |
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249 # check coverage hits |
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250 blt_ok <- blt[blt$qaccver %in% id_ok,] |
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251 Q_lengths <- blt_ok$qlen[!duplicated(blt_ok$qaccver)] |
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252 names(Q_lengths) <- blt_ok$qaccver[!duplicated(blt_ok$qaccver)] |
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253 gr <- GRanges(seqnames = blt_ok$qaccver, seqlengths = Q_lengths, |
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254 IRanges(start = blt_ok$qstart, end = blt_ok$qend)) |
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255 cvr <- coverage(gr) |
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256 L <- sapply(cvr, function(x) sum(width(x))) |
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257 C1 <- sapply(cvr, function(x) sum(as.numeric(runValue(x) >= 1) * runLength(x))) |
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258 Max_uncovered <- sapply(cvr, function(x){ |
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259 if(any(runValue(x)==0)){ |
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260 return(max(runLength(x)[runValue(x) == 0])) |
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261 }else{ |
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262 return(0) |
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263 } |
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264 }) |
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265 |
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266 # verified based on hit to reference - S |
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267 C1_prop <- C1/L |
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268 pass <- (C1_prop >= min_coverage & Max_uncovered < 500) |
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269 if (any(pass)){ |
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270 id_ok_verified <- names(C1_prop) |
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271 }else { |
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272 id_ok_verified <- NULL |
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273 } |
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274 return(list(id_with_conflict = id_with_conflict, |
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275 id_ok = id_ok, |
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276 id_ok_verified = id_ok_verified |
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277 )) |
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278 } |
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279 |
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280 |
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281 |
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282 blast_table_subset <- function(bl,id){ |
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283 return(bl[bl$qaccver %in% id & bl$saccver %in% id,, drop = FALSE]) |
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284 } |
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285 |
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286 get_representative_ranges <- function(bl, min_length = 200, min_identity = 98){ |
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287 bl <- bl[bl$pident>=min_identity, , drop=FALSE] |
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288 bl <- bl[bl$pident>=min_identity & bl$length >= min_length, , drop=FALSE] |
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289 score <- sort(unlist(by(bl$bitscore, bl$qaccver, sum, simplify = FALSE)), |
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290 decreasing = TRUE) |
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291 L <- bl$qlen[!duplicated(bl$qaccver)] |
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292 names(L) <- bl$qaccver[!duplicated(bl$qaccver)] |
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293 gr <- GRanges(seqnames = bl$qaccver, |
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294 IRanges(start = bl$qstart, end = bl$qend), |
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295 seqlengths = L, |
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296 subject = bl$saccver, |
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297 sstart = ifelse(bl$send < bl$sstart, bl$send, bl$sstart), |
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298 send = ifelse(bl$send > bl$sstart, bl$send, bl$sstart)) |
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299 SN <- levels(seqnames(gr)) |
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300 inc <- rep(TRUE, length(gr)) |
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301 MSK <- GRangesList() |
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302 for (i in names(score)){ |
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303 inc[gr$subject %in% i] <- FALSE |
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304 gr_part <- gr[seqnames(gr) %in% i & inc] |
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305 MSK[[i]] <- GRanges(seqnames = factor(gr_part$subject, levels = SN), |
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306 IRanges(start = gr_part$sstart, end = gr_part$send), |
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307 seqlengths = L |
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308 ) |
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309 } |
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310 gout <- unlist(MSK) |
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311 |
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312 full_gr <- GRanges(seqnames = factor(SN, levels = SN), |
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313 IRanges(start = rep(1,length(L)), |
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314 end = L) |
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315 ) |
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316 unmasked_gr <- GenomicRanges::setdiff(full_gr, gout) |
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317 return(unmasked_gr[width(unmasked_gr) >= min_length]) |
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318 } |
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319 |
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320 expected_diversity <- function(seqs, niter=100, km = 6){ |
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321 L <- nchar(seqs) |
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322 R <- matrix(ncol = niter, nrow = length(seqs)) |
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323 for (i in 1:niter){ |
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324 seqs_rnd <- DNAStringSet(sapply(L, function(n) paste(sample(c("A", "C", "T", "G"), n, replace=TRUE), collapse=""))) |
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325 R[,i] <- seq_diversity(seqs_rnd, km = km)$richness |
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326 } |
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327 R |
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328 |
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329 } |
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330 |
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331 seq_diversity <- function (seqs, km=6){ |
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332 K <- oligonucleotideFrequency(seqs, width=km)>0 |
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333 P <- t(K)/rowSums(K) |
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334 # shannon index |
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335 SI <- apply(P, 2, function(x) {x1 <- x[x>0]; -sum(x1*log(x1))}) |
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336 # richness |
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337 R <- rowSums(K) |
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338 list(richness=R, shannon_index=SI) |
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339 } |
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340 |
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341 |
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342 |
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343 blast <- function(s1, s2) { |
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344 tmp1 <- tempfile() |
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345 tmp2 <- tempfile() |
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346 tmp_out <- tempfile() |
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347 writeXStringSet(DNAStringSet(s1), tmp1) |
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348 writeXStringSet(DNAStringSet(s2), tmp2) |
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349 # alternative blast: |
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350 cmd <- paste("blastn -task blastn -word_size 7 -dust no -gapextend 1 -gapopen 2 -reward 1 -penalty -1", |
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351 " -query ", tmp1, ' -subject ', tmp2, ' -strand plus ', |
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352 '-outfmt "6 qaccver saccver pident length mismatch gapopen qstart qend sstart send evalue bitscore qseq sseq"', |
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353 ' -out', tmp_out) |
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354 |
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355 system(cmd) |
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356 out_raw <- read.table(tmp_out, as.is = TRUE, sep = "\t", |
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357 col.names = strsplit("qaccver saccver pident length mismatch gapopen qstart qend sstart send evalue bitscore qseq sseq", split = ' ')[[1]]) |
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358 |
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359 if (nrow(out_raw) == 0) { |
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360 return(out_raw) |
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361 } |
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362 out <- trim2TGAC(out_raw) |
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363 # remove alingment shorted that |
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364 out <- out[out$length > 100,] |
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365 if (nrow(out) == 0) { |
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366 return(out) |
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367 } |
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368 ## filter for TGCA |
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369 TG_L <- substring(out$qseq, 1, 2) == "TG" |
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370 TG_R <- substring(out$sseq, 1, 2) == "TG" |
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371 CA_L <- substring(out$qseq, out$length - 1, out$length) == "CA" |
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372 CA_R <- substring(out$sseq, out$length - 1, out$length) == "CA" |
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373 cond <- TG_L & TG_R & CA_L & CA_R |
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374 out <- out[cond, , drop = FALSE] |
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375 unlink(tmp1) |
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376 unlink(tmp2) |
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377 unlink(tmp_out) |
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378 # TODO - detele all temp files! |
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379 # unlink(tmp1, tmp2, tmp_out) |
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380 return(out) |
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381 } |
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382 |
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383 get_correct_coordinates <- function(b) { |
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384 do.call(rbind, strsplit(b$qaccver, split = "_")) |
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385 } |
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386 |
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387 evaluate_ltr <- function(GR, GRL, GRR, blast_line, Lseq, Rseq) { |
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388 LTR_L <- makeGRangesFromDataFrame(data.frame(seqnames = seqnames(GR), |
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389 start = start(GRL) + blast_line$qstart - 2, |
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390 end = start(GRL) + blast_line$qend - 1)) |
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391 LTR_R <- makeGRangesFromDataFrame(data.frame(seqnames = seqnames(GR), |
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392 start = start(GRR) + blast_line$sstart - 2, |
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393 end = start(GRR) + blast_line$send - 1)) |
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394 |
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395 TSD_L <- makeGRangesFromDataFrame(data.frame(seqnames = seqnames(GR), |
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396 start = start(GRL) + blast_line$qstart - 3:10, |
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397 end = start(GRL) + blast_line$qstart - 3)) |
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398 TSD_R <- makeGRangesFromDataFrame(data.frame(seqnames = seqnames(GR), |
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399 start = start(GRR) + blast_line$send, |
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400 end = start(GRR) + blast_line$send + 0:7)) |
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401 |
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402 TSD_L_seq <- DNAStringSet(substring(Lseq, blast_line$qstart - 2:9, blast_line$qstart - 2)) |
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403 TSD_R_seq <- DNAStringSet(substring(Rseq, blast_line$send + 1, blast_line$send + 1:8)) |
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404 |
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405 matching_tsd <- TSD_R_seq == TSD_L_seq |
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406 matching_tsd[1:3] <- FALSE # remove short tsd |
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407 p <- which(matching_tsd) |
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408 if (length(p) > 0) { |
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409 TSD_Length <- max(p) |
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410 TSD_sequence <- TSD_L_seq[TSD_Length] |
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411 TSD_position <- append(TSD_R[TSD_Length], TSD_L[TSD_Length]) |
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412 }else { |
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413 TSD_Length <- 0 |
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414 TSD_sequence <- "" |
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415 TSD_position <- NA |
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416 } |
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417 |
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418 TE_Length <- end(LTR_R) - start(LTR_L) |
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419 LTR_Identity <- blast_line$pident |
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420 out <- list(TSD_position = TSD_position, TSD_sequence = TSD_sequence, TSD_Length = TSD_Length, |
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421 LTR_R_position = LTR_R, LTR_L_position = LTR_L, TE_Length = TE_Length, LTR_Identity = LTR_Identity) |
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422 return(out) |
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423 } |
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424 |
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425 get_best_ltr <- function(x) { |
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426 tsd_ok <- sapply(x, function(k)k$TSD_Length > 3) |
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427 te_length_ok <- sapply(x, function(k)k$TE_Length < 30000) |
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428 ltr_length_ok <- sapply(x, function(k)width(k$LTR_R_position) >= 100 & width(k$LTR_L_position) >= 100) |
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429 if (sum(tsd_ok & te_length_ok & ltr_length_ok) >= 1) { |
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430 # return the first one (best bitscore) |
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431 return(x[tsd_ok & te_length_ok][1]) |
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432 } |
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433 if (any(te_length_ok & ltr_length_ok)) { |
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434 return(x[te_length_ok & ltr_length_ok][1]) |
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435 }else { |
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436 return(NULL) |
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437 } |
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438 } |
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439 |
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440 get_te_gff3 <- function(g, ID) { |
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441 D <- makeGRangesFromDataFrame(g$domain, keep.extra.columns = TRUE) |
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442 sn <- seqnames(D)[1] |
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443 S <- strand(D)[1] |
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444 TE <- GRanges(seqnames = sn, |
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445 IRanges(start = start(g$ltr_info[[1]]$LTR_L_position), |
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446 end = end(g$ltr_info[[1]]$LTR_R_position)), strand = S) |
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447 TE$type <- "transposable_element" |
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448 TE$ID <- ID |
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449 |
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450 if (as.character(S) == "+") { |
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451 LTR_5 <- g$ltr_info[[1]]$LTR_L |
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452 LTR_3 <- g$ltr_info[[1]]$LTR_R |
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453 }else { |
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454 LTR_3 <- g$ltr_info[[1]]$LTR_L |
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455 LTR_5 <- g$ltr_info[[1]]$LTR_R |
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456 } |
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457 LTR_5$LTR <- '5LTR' |
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458 LTR_3$LTR <- '3LTR' |
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459 LTR_5$type <- "long_terminal_repeat" |
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460 LTR_3$type <- "long_terminal_repeat" |
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461 strand(LTR_3) <- S |
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462 strand(LTR_5) <- S |
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463 LTR_3$Parent <- ID |
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464 LTR_5$Parent <- ID |
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465 LTR_3$Final_Classification <- D$Final_Classification[1] |
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466 LTR_5$Final_Classification <- D$Final_Classification[1] |
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467 LTR_5$LTR_Identity <- g$ltr_info[[1]]$LTR_Identity |
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468 LTR_3$LTR_Identity <- g$ltr_info[[1]]$LTR_Identity |
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469 |
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470 TE$LTR_Identity <- g$ltr_info[[1]]$LTR_Identity |
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471 TE$LTR5_length <- width(LTR_5) |
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472 TE$LTR3_length <- width(LTR_3) |
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473 |
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474 if (is.na(g$ltr_info[[1]]$TSD_position)[1]) { |
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475 # no TSD found |
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476 TSD <- NULL |
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477 TE$TSD <- 'not_found' |
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478 }else { |
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479 TSD <- g$ltr_info[[1]]$TSD_position |
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480 TSD$type <- "target_site_duplication" |
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481 TSD$Parent <- ID |
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482 TE$TSD <- as.character(g$ltr_info[[1]]$TSD_sequence) |
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483 } |
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484 |
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485 TE$Final_Classification <- D$Final_Classification[1] |
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486 |
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487 D$Parent <- ID |
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488 out <- c(TE, LTR_3, LTR_5, D, TSD) |
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489 return(out) |
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490 } |
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491 |
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492 get_TE <- function(Lseq, Rseq, domains_gff, GR, GRL, GRR) { |
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493 xx <- blast(Lseq, Rseq) |
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494 if (nrow(xx) == 0) { |
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495 return(NULL) |
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496 }else { |
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497 ltr_tmp <- list() |
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498 for (j in 1:nrow(xx)) { |
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499 ltr_tmp[[j]] <- evaluate_ltr(GR, GRL, GRR, xx[j, , drop = FALSE], Lseq, Rseq) |
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500 } |
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501 ltr <- get_best_ltr(ltr_tmp) |
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502 if (length(ltr) == 0) { |
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503 return(NULL) |
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504 ## add good ltr |
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505 }else { |
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506 return(list(domain = domains_gff, ltr_info = ltr, blast_out = xx)) |
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507 } |
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508 } |
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509 } |
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510 |
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511 add_pbs <- function(te, s, trna_db) { |
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512 ltr5 <- te[which(te$LTR == "5LTR")] |
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513 STRAND <- as.character(strand(te)[1]) |
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514 if (STRAND == "+") { |
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515 pbs_gr <- GRanges(seqnames(ltr5), IRanges(start = end(ltr5) + 1, end = end(ltr5) + 31)) |
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516 pbs_s <- reverseComplement(getSeq(s, pbs_gr)) |
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517 }else { |
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518 pbs_gr <- GRanges(seqnames(ltr5), IRanges(end = start(ltr5) - 1, start = start(ltr5) - 30)) |
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519 pbs_s <- getSeq(s, pbs_gr) |
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520 } |
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521 |
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522 names(pbs_s) <- "pbs_region" |
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523 # find trna match |
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524 tmp <- tempfile() |
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525 tmp_out <- tempfile() |
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526 writeXStringSet(DNAStringSet(pbs_s), tmp) |
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527 # alternative blast: |
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528 cmd <- paste("blastn -task blastn -word_size 7 -dust no -perc_identity 100", |
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529 " -query ", tmp, ' -db ', trna_db, ' -strand plus ', |
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530 '-outfmt "6 qaccver saccver pident length mismatch gapopen qstart qend sstart send evalue bitscore qseq sseq"', |
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531 ' -out', tmp_out) |
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532 |
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533 system(cmd) |
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534 pbs_exact_gr <- NULL |
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535 out_raw <- read.table(tmp_out, as.is = TRUE, sep = "\t", |
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536 col.names = strsplit( |
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537 "qaccver saccver pident length mismatch gapopen qstart qend sstart send evalue bitscore qseq sseq", |
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538 split = ' ')[[1]]) |
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539 if (nrow(out_raw) > 0) { |
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540 cca <- grepl("CCA$", out_raw$qseq) |
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541 to_end <- out_raw$send == 23 # align to end of sequence |
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542 max_dist <- out_raw$qend > 25 # max 5 bp from ltr |
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543 min_length <- out_raw$length >= 10 |
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544 out_pass <- out_raw[cca & to_end & max_dist & min_length,] |
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545 if (nrow(out_pass) > 0) { |
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546 trna_id <- out_pass$saccver[1] |
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547 if (STRAND == "+") { |
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548 S <- end(ltr5) + 32 - out_pass$qend[1] |
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549 E <- end(ltr5) + 32 - out_pass$qstart[1] |
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550 }else { |
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551 S <- start(ltr5) - 31 + out_pass$qstart[1] |
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552 E <- start(ltr5) - 31 + out_pass$qend[1] |
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553 } |
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554 pbs_exact_gr <- GRanges(seqnames(ltr5), IRanges(start = S, end = E)) |
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555 pbs_exact_gr$trna_id <- trna_id |
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556 pbs_exact_gr$Length <- out_pass$Length |
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557 strand(pbs_exact_gr) <- STRAND |
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558 pbs_exact_gr$type <- 'primer_binding_site' |
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559 pbs_exact_gr$Parent <- te[1]$ID |
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560 te$trna_id <- c(trna_id, rep(NA, length(te) - 1)) |
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561 |
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562 } |
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563 } |
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564 te <- append(te, pbs_exact_gr) |
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565 unlink(tmp) |
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566 unlink(tmp_out) |
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567 return(te) |
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568 } |
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569 |
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570 |
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571 get_te_rank <- function (gr){ |
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572 DL_id <- gr$ID[gr$type == "transposable_element" & |
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573 gr$TSD == "not_found" & |
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574 is.na(gr$trna_id)] |
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575 DLT_id <- gr$ID[gr$type == "transposable_element" & |
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576 gr$TSD != "not_found" & |
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577 is.na(gr$trna_id)] |
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578 DLTP_id <- gr$ID[gr$type == "transposable_element" & |
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579 gr$TSD != "not_found" & |
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580 !is.na(gr$trna_id)] |
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581 DLP_id <- gr$ID[gr$type == "transposable_element" & |
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582 gr$TSD == "not_found" & |
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583 !is.na(gr$trna_id)] |
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584 Rank <- character(length(gr)) |
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585 ID <- unlist(ifelse(is.na(gr$ID), gr$Parent, gr$ID)) |
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586 |
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587 Rank[ID %in% DL_id] <- "DL" |
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588 Rank[ID %in% DLT_id] <- "DLT" |
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589 Rank[ID %in% DLP_id] <- "DLP" |
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590 Rank[ID %in% DLTP_id] <- "DLTP" |
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591 return(Rank) |
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592 } |
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593 |
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594 get_te_statistics <- function(gr, RT) { |
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595 DOMAINS_LTR <- gr[gr$type == "transposable_element" & |
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596 gr$TSD == "not_found" & |
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597 is.na(gr$trna_id)] |
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598 DOMAINS_LTR_TSD <- gr[gr$type == "transposable_element" & |
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599 gr$TSD != "not_found" & |
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600 is.na(gr$trna_id)] |
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601 DOMAINS_LTR_TSD_PBS <- gr[gr$type == "transposable_element" & |
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602 gr$TSD != "not_found" & |
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603 !is.na(gr$trna_id)] |
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604 DOMAINS_LTR_PBS <- gr[gr$type == "transposable_element" & |
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605 gr$TSD == "not_found" & |
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606 !is.na(gr$trna_id)] |
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607 |
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608 all_class <- names(sort(table(RT$Final_Classification), decreasing = TRUE)) |
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609 RT_domain <- as.integer(table(factor(RT$Final_Classification, levels = all_class))) |
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610 DL <- as.integer(table(factor(DOMAINS_LTR$Final_Classification, levels = all_class))) |
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611 DLT <- as.integer(table(factor(DOMAINS_LTR_TSD$Final_Classification, levels = all_class))) |
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612 DLTP <- as.integer(table(factor(DOMAINS_LTR_TSD_PBS$Final_Classification, levels = all_class))) |
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613 DLP <- as.integer(table(factor(DOMAINS_LTR_PBS$Final_Classification, levels = all_class))) |
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614 out <- data.frame(RT_domain = RT_domain, |
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615 DOMAINS_LTR = DL, |
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616 DOMAINS_LTR_TSD = DLT, |
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617 DOMAINS_LTR_PBS = DLP, |
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618 DOMAINS_LTR_TSD_PBS = DLTP, |
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619 row.names = all_class |
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620 ) |
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621 total <- colSums(out) |
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622 out <- rbind(out, Total = total) |
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623 return(out) |
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624 } |
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625 |
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626 getSeqNamed <- function(s, gr, name = NULL) { |
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627 spart <- getSeq(s, gr) |
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628 if (is.null(name)){ |
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629 id1 <- paste0(seqnames(gr), '_', start(gr), "_", end(gr)) |
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630 }else{ |
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631 id1 <- mcols(gr)[,name] |
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632 } |
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633 id2 <- gr$Final_Classification |
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634 names(spart) <- paste0(id1, "#", id2) |
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635 spart |
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636 } |
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637 |
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638 get_TE_id <- function (gr){ |
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639 gr_te <- gr[gr$type == "transposable_element"] |
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640 ID <- gr_te$ID |
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641 A <- paste0(seqnames(gr_te), '_', start(gr_te), "_", end(gr_te)) |
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642 B <- gr_te$Final_Classification |
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643 names(ID) <- paste0(A, "#", B) |
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644 |
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645 } |
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646 |
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647 get_te_sequences <- function(gr, s) { |
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648 # return list of biostrings |
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649 DOMAINS_LTR <- gr[gr$type == "transposable_element" & |
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650 gr$TSD == "not_found" & |
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651 is.na(gr$trna_id)] |
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652 DOMAINS_LTR_TSD <- gr[gr$type == "transposable_element" & |
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653 gr$TSD != "not_found" & |
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654 is.na(gr$trna_id)] |
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655 DOMAINS_LTR_TSD_PBS <- gr[gr$type == "transposable_element" & |
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656 gr$TSD != "not_found" & |
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657 !is.na(gr$trna_id)] |
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658 DOMAINS_LTR_PBS <- gr[gr$type == "transposable_element" & |
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659 gr$TSD == "not_found" & |
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660 !is.na(gr$trna_id)] |
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661 s_DL <- getSeqNamed(s, DOMAINS_LTR) |
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662 s_DLT <- getSeqNamed(s, DOMAINS_LTR_TSD) |
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663 s_DLP <- getSeqNamed(s, DOMAINS_LTR_PBS) |
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664 s_DLTP <- getSeqNamed(s, DOMAINS_LTR_TSD_PBS) |
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665 return(DNAStringSetList( |
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666 DL = s_DL, |
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667 DLT = s_DLT, |
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668 DLP = s_DLP, |
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669 DLTP = s_DLTP |
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670 )) |
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671 |
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672 } |
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673 |
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674 cd_hit_est <- function(seqs, min_identity = 0.9, word_size = 10, ncpu = 2){ |
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675 # runs cd-hi-est and return table with cluster membership, and size and if reads was repesentative |
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676 # input sequences must be in the same orientation!!! |
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677 sfile <- tempfile() |
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678 fasta_out <- tempfile() |
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679 clstr <- paste0(fasta_out,".clstr") |
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680 # cdhit is triming names!! |
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681 ori_names <- names(seqs) |
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682 names(seqs) <- seq_along(seqs) |
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683 writeXStringSet(seqs, sfile) |
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684 cmd <- paste("cd-hit-est", |
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685 "-i", sfile, |
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686 "-o", fasta_out, |
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687 "-c", min_identity, |
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688 "-n", word_size, |
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689 "-T", ncpu, |
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690 "-r", 0) |
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691 system(cmd) |
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692 cls_raw <- grep("^>", readLines(clstr), invert = TRUE, value = TRUE) |
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693 unlink(fasta_out) |
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694 unlink(clstr) |
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695 index <- gsub("\t.+","",cls_raw) |
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696 id <- as.numeric(gsub("[.].+","", |
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697 gsub(".+>", "", cls_raw)) |
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698 ) |
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699 is_representative <- id %in% id[grep("[*]$",cls_raw)] |
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700 membership <- cumsum(index=="0") |
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701 cluster_size <- tabulate(membership)[membership] |
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702 # reorder |
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703 ord <- order(id) |
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704 cls_info <- data.frame( |
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705 seq_id = ori_names, |
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706 membership = membership[ord], |
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707 cluster_size = cluster_size[ord], |
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708 is_representative = is_representative[ord] |
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709 ) |
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710 return(cls_info) |
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711 } |
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712 |