Mercurial > repos > gregory-minevich > snp_mapping_using_wgs
changeset 10:7d6bccd5f88c draft
Uploaded
| author | gregory-minevich |
|---|---|
| date | Thu, 14 Jun 2012 20:34:20 -0400 |
| parents | d4aa63bc2ef6 |
| children | cb4c388fb155 |
| files | SNP_Mapping.py |
| diffstat | 1 files changed, 249 insertions(+), 95 deletions(-) [+] |
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--- a/SNP_Mapping.py Tue Mar 27 11:33:24 2012 -0400 +++ b/SNP_Mapping.py Thu Jun 14 20:34:20 2012 -0400 @@ -5,6 +5,7 @@ import optparse import csv import re +import pprint from decimal import * from rpy import * @@ -16,10 +17,13 @@ parser.add_option('-v', '--haw_vcf', dest = 'haw_vcf', action = 'store', type = 'string', default = None, help = "vcf file of Hawaiian SNPs") parser.add_option('-l', '--loess_span', dest = 'loess_span', action = 'store', type = 'float', default = .01, help = "Loess span") parser.add_option('-d', '--d_yaxis', dest = 'd_yaxis', action = 'store', type = 'float', default = .7, help = "y-axis upper limit for dot plot") - parser.add_option('-y', '--h_yaxis', dest = 'h_yaxis', action = 'store', type = 'int', default = 500, help = "y-axis upper limit for dot plot") + parser.add_option('-y', '--h_yaxis', dest = 'h_yaxis', action = 'store', type = 'int', default = 5, help = "y-axis upper limit for histogram plot") parser.add_option('-c', '--points_color', dest = 'points_color', action = 'store', type = 'string', default = "gray27", help = "Color for data points") parser.add_option('-k', '--loess_color', dest = 'loess_color', action = 'store', type = 'string', default = "red", help = "Color for loess regression line") - parser.add_option('-z', '--standardize', dest = 'standardize', default= 'false', help = "Standardize X-axis") + parser.add_option('-z', '--standardize', dest = 'standardize', default= 'true', help = "Standardize X-axis") + parser.add_option('-b', '--break_file', dest = 'break_file', action = 'store', type = 'string', default = 'C.elegans', help = "File defining the breaks per chromosome") + parser.add_option('-x', '--bin_size', dest = 'bin_size', action = 'store', type = 'int', default = 1000000, help = "Size of histogram bins, default is 1mb") + parser.add_option('-n', '--do_not_normalize_bin', dest = 'do_not_normalize_bin', action = 'store_true', help = "Do not Normalize histograms") parser.add_option('-o', '--output', dest = 'output', action = 'store', type = 'string', default = None, help = "Output file name") parser.add_option('-s', '--location_plot_output', dest = 'location_plot_output', action = 'store', type = 'string', default = "SNP_Mapping_Plot.pdf", help = "Output file name of SNP plots by chromosomal location") @@ -30,10 +34,18 @@ haw_snps = build_haw_snp_dictionary(haw_vcf = options.haw_vcf) pileup_info = parse_pileup(sample_pileup = options.sample_pileup, haw_snps = haw_snps) - output_pileup_info(output = options.output, pileup_info = pileup_info) + output_pileup_info(output = options.output, pileup_info = pileup_info) + #output plot with all ratios - output_scatter_plots_by_location(location_plot_output = options.location_plot_output, pileup_info = pileup_info, loess_span=options.loess_span, d_yaxis=options.d_yaxis, h_yaxis=options.h_yaxis, points_color=options.points_color, loess_color=options.loess_color, standardize =options.standardize) + rounded_bin_size = int(round((float(options.bin_size) / 1000000), 1) * 1000000) + + normalized_histogram_bins_per_mb = calculate_normalized_histogram_bins_per_xbase(pileup_info = pileup_info, xbase = rounded_bin_size, do_not_normalize = options.do_not_normalize_bin) + normalized_histogram_bins_per_5kb = calculate_normalized_histogram_bins_per_xbase(pileup_info = pileup_info, xbase = (rounded_bin_size / 2), do_not_normalize = options.do_not_normalize_bin) + + break_dict = parse_breaks(break_file = options.break_file) + + output_scatter_plots_by_location(location_plot_output = options.location_plot_output, pileup_info = pileup_info, loess_span=options.loess_span, d_yaxis=options.d_yaxis, h_yaxis=options.h_yaxis, points_color=options.points_color, loess_color=options.loess_color, standardize =options.standardize, normalized_hist_per_mb = normalized_histogram_bins_per_mb, normalized_hist_per_5kb = normalized_histogram_bins_per_5kb, breaks = break_dict, rounded_bin_size = rounded_bin_size) #For plotting with map units on the X-axis instead of physical distance) #output_scatter_plots_by_mapping_units(mpu_plot_output = options.mpu_plot_output, pileup_info = pileup_info) @@ -49,6 +61,26 @@ for i in range(0, comment): reader.next() +def parse_breaks(break_file = None): + if break_file == 'C.elegans': + break_dict = { 'I' : 16 , 'II' : 16, 'III' : 14, 'IV' : 18, 'V' : 21, 'X' : 18 } + return break_dict + elif break_file == 'Arabadopsis': + break_dict = { '1' : 16 , '2' : 16, '3' : 21, '4' : 18, '5' : 21 } + return break_dict + else: + i_file = open(break_file, 'rU') + break_dict = {} + reader = csv.reader(i_file, delimiter = '\t') + for row in reader: + chromosome = row[0].upper() + chromosome = re.sub("chr", "", chromosome, flags = re.IGNORECASE) + chromosome = re.sub("CHROMOSOME_", "", chromosome, flags = re.IGNORECASE) + break_count = row[1] + break_dict[chromosome] = int(break_count) + return break_dict + + def location_comparer(location_1, location_2): chr_loc_1 = location_1.split(':')[0] pos_loc_1 = int(location_1.split(':')[1]) @@ -87,59 +119,63 @@ o_file.close() -def output_scatter_plots_by_location(location_plot_output = None, pileup_info = None, loess_span="", d_yaxis="", h_yaxis="", points_color="", loess_color="", standardize=None): - i = {} - ii = {} - iii = {} - iv = {} - v = {} - x = {} - - breaks = { 'I' : 16 , 'II' : 16, 'III' : 14, 'IV' : 18, 'V' : 21, 'X' : 18 } - - for location in pileup_info: - chromosome = location.split(':')[0] - position = location.split(':')[1] - - alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit = pileup_info[location] - - if chromosome == "I": - i[position] = ratio - elif chromosome == "II": - ii[position] = ratio - elif chromosome == "III": - iii[position] = ratio - elif chromosome == "IV": - iv[position] = ratio - elif chromosome == "V": - v[position] = ratio - elif chromosome == "X": - x[position] = ratio +def output_scatter_plots_by_location(location_plot_output = None, pileup_info = None, loess_span="", d_yaxis="", h_yaxis="", points_color="", loess_color="", standardize=None, normalized_hist_per_mb = None, normalized_hist_per_5kb = None, breaks = None, rounded_bin_size = 1000000): + positions = {} + current_chr = "" + prev_chr = "" x_label = "Location (Mb)" filtered_label = '' + location_sorted_pileup_info_keys = sorted(pileup_info.keys(), cmp=location_comparer) + + break_unit = Decimal(rounded_bin_size) / Decimal(1000000) + max_breaks = max(breaks.values()) try: - r.pdf(location_plot_output, 8, 8) - if i: - plot_data(chr_dict = i, chr = "I" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["I"], standardize=standardize) - if ii: - plot_data(chr_dict = ii, chr = "II" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["II"], standardize=standardize) - if iii: - plot_data(chr_dict = iii, chr = "III" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["III"], standardize=standardize) - if iv: - plot_data(chr_dict = iv, chr = "IV" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["IV"], standardize=standardize) - if v: - plot_data(chr_dict = v, chr = "V" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["V"], standardize=standardize) - if x: - plot_data(chr_dict = x, chr = "X" + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks["X"], standardize=standardize) + r.pdf(location_plot_output, 8, 8) + + for location in location_sorted_pileup_info_keys: + current_chr = location.split(':')[0] + position = location.split(':')[1] - r.dev_off() - except Exception as inst: + alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit = pileup_info[location] + + if prev_chr != current_chr: + if prev_chr != "": + hist_dict_mb = get_hist_dict_by_chr(normalized_hist_per_xbase = normalized_hist_per_mb, chr = prev_chr) + hist_dict_5kb = get_hist_dict_by_chr(normalized_hist_per_xbase = normalized_hist_per_5kb, chr = prev_chr) + + plot_data(chr_dict = positions, hist_dict_mb = hist_dict_mb, hist_dict_5kb = hist_dict_5kb, chr = prev_chr + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks[prev_chr], standardize=standardize, max_breaks = max_breaks, break_unit = break_unit) + + prev_chr = current_chr + positions = {} + + positions[position] = ratio + + hist_dict_mb = get_hist_dict_by_chr(normalized_hist_per_xbase = normalized_hist_per_mb, chr = current_chr) + hist_dict_5kb = get_hist_dict_by_chr(normalized_hist_per_xbase = normalized_hist_per_5kb, chr = current_chr) + + plot_data(chr_dict = positions, hist_dict_mb = hist_dict_mb, hist_dict_5kb = hist_dict_5kb, chr = current_chr + filtered_label, x_label = "Location (Mb)", divide_position = True, draw_secondary_grid_lines = True, loess_span=loess_span, d_yaxis=d_yaxis, h_yaxis=h_yaxis, points_color=points_color, loess_color=loess_color, breaks = breaks[current_chr], standardize=standardize, max_breaks = max_breaks, break_unit = break_unit) + + r.dev_off() + + except Exception as inst: print inst print "There was an error creating the location plot pdf... Please try again" +def get_hist_dict_by_chr(normalized_hist_per_xbase = None, chr = ''): + hist_dict = {} + + for location in normalized_hist_per_xbase: + chromosome = location.split(':')[0] + if chromosome == chr: + position = int(location.split(':')[1]) + hist_dict[position] = normalized_hist_per_xbase[location] + + return hist_dict + +''' def output_scatter_plots_by_mapping_units(mpu_plot_output = None, pileup_info = None): i = {} ii = {} @@ -181,83 +217,88 @@ except Exception as inst: print inst print "There was an error creating the map unit plot pdf... Please try again" - +''' -def plot_data(chr_dict = None, chr = "", x_label = "", divide_position = False, draw_secondary_grid_lines = False, loess_span=None, d_yaxis=None, h_yaxis=None, points_color="", loess_color="", breaks = None, standardize= None): +def plot_data(chr_dict = None, hist_dict_mb = None, hist_dict_5kb = None, chr = "", x_label = "", divide_position = False, draw_secondary_grid_lines = False, loess_span=None, d_yaxis=None, h_yaxis=None, points_color="", loess_color="", breaks = None, standardize= None, max_breaks = 1, break_unit = 1): ratios = "c(" positions = "c(" - z_ratios = "c(" - z_positions = "c(" - + for position in chr_dict: ratio = chr_dict[position] if divide_position: position = float(position) / 1000000.0 positions = positions + str(position) + ", " ratios = ratios + str(ratio) + ", " - if ratio == 0: - if divide_position: - z_position = float(position) / 1000000.0 - z_positions = z_positions + str(position) + ", " - z_ratios = z_ratios + str(ratio) + ", " - if len(ratios) == 2: ratios = ratios + ")" else: ratios = ratios[0:len(ratios) - 2] + ")" - if len(z_ratios) == 2: - z_ratios = z_ratios + ")" - else: - z_ratios = z_ratios[0:len(z_ratios) - 2] + ")" - - if len(positions) == 2: positions = positions + ")" else: positions = positions[0:len(positions) - 2] + ")" - if len(z_positions) == 2: - z_positions = z_positions + ")" - else: - z_positions = z_positions[0:len(z_positions) - 2] + ")" - r("x <- " + positions) r("y <- " + ratios) - r("xz <- " + z_positions) - r("yz <- " + z_ratios) + hist_mb_values = "c(" + for position in sorted(hist_dict_mb): + hist_mb_values = hist_mb_values + str(hist_dict_mb[position]) + ", " + + if len(hist_mb_values) == 2: + hist_mb_values = hist_mb_values + ")" + else: + hist_mb_values = hist_mb_values[0:len(hist_mb_values) - 2] + ")" + + hist_5kb_values = "c(" + for position in sorted(hist_dict_5kb): + hist_5kb_values = hist_5kb_values + str(hist_dict_5kb[position]) + ", " - if (standardize=='true'): - r("plot(x, y, cex=0.60, xlim=c(0,21), main='LG " + chr + "', xlab= '" + x_label + "', ylim = c(0, %f " %d_yaxis + "), ylab='HA Ratio [Hawaiian Reads / Total Read Depth]', pch=18, col='"+ points_color +"')") + if len(hist_5kb_values) == 2: + hist_5kb_values = hist_5kb_values + ")" + else: + hist_5kb_values = hist_5kb_values[0:len(hist_5kb_values) - 2] + ")" + + r("xz <- " + hist_mb_values) + r("yz <- " + hist_5kb_values) + + max_break_str = str(max_breaks) + break_unit_str = str(Decimal(break_unit)) + half_break_unit_str = str(Decimal(break_unit) / Decimal(2)) + break_penta_unit_str = str(Decimal(break_unit) * Decimal(5)) + + if (standardize=='true'): + r("plot(x, y, ,cex=0.60, xlim=c(0," + max_break_str + "), main='LG " + chr + "', xlab= '" + x_label + "', ylim = c(0, %f " %d_yaxis + "), ylab='Ratios of mapping strain alleles/total reads (at SNP positions)', pch=18, col='"+ points_color +"')") r("lines(loess.smooth(x, y, span = %f "%loess_span + "), lwd=5, col='"+ loess_color +"')") - r("axis(1, at=seq(0, 21, by=1), labels=FALSE, tcl=-0.5)") - r("axis(1, at=seq(0, 21, by=0.5), labels=FALSE, tcl=-0.25)") + r("axis(1, at=seq(0, " + max_break_str + ", by=" + break_unit_str + "), labels=FALSE, tcl=-0.5)") + r("axis(1, at=seq(0, " + max_break_str + ", by=" + half_break_unit_str + "), labels=FALSE, tcl=-0.25)") r("axis(2, at=seq(floor(min(y)), 1, by=0.1), labels=FALSE, tcl=-0.2)") elif (standardize=='false'): - r("plot(x, y, cex=0.60, main='LG " + chr + "', xlab= '" + x_label + "', ylim = c(0, %f " %d_yaxis + "), ylab='HA Ratio [Hawaiian Reads / Total Read Depth]', pch=18, col='"+ points_color +"')") + r("plot(x, y, cex=0.60, main='LG " + chr + "', xlab= '" + x_label + "', ylim = c(0, %f " %d_yaxis + "), ylab='Ratios of mapping strain alleles/total reads (at SNP positions)', pch=18, col='"+ points_color +"')") r("lines(loess.smooth(x, y, span = %f "%loess_span + "), lwd=5, col='"+ loess_color +"')") - r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by=1), labels=FALSE, tcl=-0.5)") - r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by=0.5), labels=FALSE, tcl=-0.25)") + r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by= " + break_unit_str + "), labels=FALSE, tcl=-0.5)") + r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by= " + half_break_unit_str + "), labels=FALSE, tcl=-0.25)") r("axis(2, at=seq(floor(min(y)), 1, by=0.1), labels=FALSE, tcl=-0.2)") - if draw_secondary_grid_lines: r("abline(h = seq(floor(min(y)), 1, by=0.1), v = seq(floor(min(x)), length(x), by= 1), col='gray')") else: r("grid(lty = 1, col = 'gray')") if (standardize=='true'): - r("hist(xz, col='darkgray', xlim=c(0,21), xlab='Location (Mb)', ylab='Frequency SNP Positions Where HA Ratio=0 ', ylim=c(0, %f " %h_yaxis + "), breaks = seq(0, as.integer( ' " + str(breaks) + " '), by=1), main='LG " + chr + "')") - r("hist(xz, add=TRUE, col=rgb(1, 0, 0, 1), xlim=c(0,21), xlab='Location (Mb)', ylab='Frequency SNP Positions Where HA Ratio=0 ', ylim=c(0, %f " %h_yaxis + "), breaks = seq(0, as.integer( ' " + str(breaks) + " '), by=.5), main='Chr " + chr + "')") - r("axis(1, at=seq(0, 21, by=1), labels=FALSE, tcl=-0.5)") - r("axis(1, at=seq(0, 21, by=0.5), labels=FALSE, tcl=-0.25)") + r("barplot(xz, xlim=c(0, " + max_break_str + "), ylim = c(0, " + str(h_yaxis) + "), yaxp=c(0, " + str(h_yaxis) + ", 1), space = 0, col='darkgray', width = " + break_unit_str + ", xlab='Location (Mb)', ylab='Normalized frequency of pure parental alleles ', main='LG " + chr + "')") + r("barplot(yz, space = 0, add=TRUE, width = " + half_break_unit_str + ", col=rgb(1, 0, 0, 1))") + r("axis(1, hadj = 1, at=seq(0, " + max_break_str + ", by= " + break_unit_str + "), labels=FALSE, tcl=-0.5)") + r("axis(1, at=seq(0, " + max_break_str + ", by= " + break_penta_unit_str + "), labels=TRUE, tcl=-0.5)") + r("axis(1, at=seq(0, " + max_break_str + ", by= " + half_break_unit_str + "), labels=FALSE, tcl=-0.25)") elif (standardize=='false'): - r("hist(xz, col='darkgray', xlab='Location (Mb)', ylab='Frequency SNP Positions Where HA Ratio=0 ', ylim=c(0, %f " %h_yaxis + "), breaks = seq(0, as.integer( ' " + str(breaks) + " '), by=1), main='LG " + chr + "')") - r("hist(xz, add=TRUE, col=rgb(1, 0, 0, 1), xlab='Location (Mb)', ylab='Frequency SNP Positions Where HA Ratio=0 ', ylim=c(0, %f " %h_yaxis + "), breaks = seq(0, as.integer( ' " + str(breaks) + " '), by=.5), main='Chr " + chr + "')") - r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by=1), labels=FALSE, tcl=-0.5)") - r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by=0.5), labels=FALSE, tcl=-0.25)") + r("barplot(xz, ylim = c(0, " + str(h_yaxis) + "), yaxp=c(0, " + str(h_yaxis) + ", 1), space = 0, col='darkgray', width = 1, xlab='Location (Mb)', ylab='Normalized frequency of pure parental alleles ', main='LG " + chr + "')") + r("barplot(yz, space = 0, add=TRUE, width = 0.5, col=rgb(1, 0, 0, 1))") + r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by= " + break_unit_str + "), labels=FALSE, tcl=-0.5)") + r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by= " + break_penta_unit_str + ", labels=TRUE, tcl=-0.5)") + r("axis(1, at=seq(0, as.integer( ' " + str(breaks) + " '), by= " + break_half_unit_str + "), labels=FALSE, tcl=-0.25)") def build_haw_snp_dictionary(haw_vcf = None): @@ -278,7 +319,8 @@ haw_snp_id = row[2] ref_allele = row[3] alt_allele = row[4] - info = row[7] + + info = row[7] mapping_unit = info.replace("MPU=", "") @@ -288,6 +330,116 @@ i_file.close() return haw_snps + +def calculate_normalized_histogram_bins_per_xbase(pileup_info = None, xbase = 1000000, do_not_normalize = False): + normalized_histogram_bins_per_xbase = {} + + ref_snp_count_per_xbase = get_ref_snp_count_per_xbase(pileup_info = pileup_info, xbase = xbase) + mean_zero_snp_count_per_chromosome = get_mean_zero_snp_count_per_chromosome(pileup_info = pileup_info, xbase = xbase) + zero_snp_count_per_xbase = get_zero_snp_count_per_xbase(pileup_info = pileup_info, xbase = xbase) + + for location in ref_snp_count_per_xbase: + chromosome = location.split(':')[0] + mean_zero_snp_count = mean_zero_snp_count_per_chromosome[chromosome] + ref_snp_count = ref_snp_count_per_xbase[location] + + zero_snp_count = 0 + if location in zero_snp_count_per_xbase: + zero_snp_count = zero_snp_count_per_xbase[location] + + if do_not_normalize == True: + normalized_histogram_bins_per_xbase[location] = zero_snp_count + else: + if zero_snp_count == 0 or ref_snp_count == 0: + normalized_histogram_bins_per_xbase[location] = 0 + elif zero_snp_count == ref_snp_count: + normalized_histogram_bins_per_xbase[location] = 0 + else: + normalized_histogram_bins_per_xbase[location] = (Decimal(zero_snp_count) / (Decimal(ref_snp_count)-Decimal(zero_snp_count))) * Decimal(mean_zero_snp_count) + + return normalized_histogram_bins_per_xbase + +def get_ref_snp_count_per_xbase(pileup_info = None, xbase = 1000000): + ref_snps_per_xbase = {} + + for location in pileup_info: + location_info = location.split(':') + + chromosome = location_info[0].upper() + chromosome = re.sub("chr", "", chromosome, flags = re.IGNORECASE) + chromosome = re.sub("CHROMOSOME_", "", chromosome, flags = re.IGNORECASE) + + position = location_info[1] + xbase_position = (int(position) / xbase) + 1 + + location = chromosome + ":" + str(xbase_position) + if location in ref_snps_per_xbase: + ref_snps_per_xbase[location] = ref_snps_per_xbase[location] + 1 + else: + ref_snps_per_xbase[location] = 1 + + return ref_snps_per_xbase + +def get_mean_zero_snp_count_per_chromosome(pileup_info, xbase = 1000000): + sample_snp_count_per_xbase = {} + + for location in pileup_info: + alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit = pileup_info[location] + + location_info = location.split(':') + chromosome = location_info[0] + position = location_info[1] + xbase_position = (int(position) / xbase) + 1 + xbase_location = chromosome + ":" + str(xbase_position) + + if alt_allele_count == 0: + if xbase_location in sample_snp_count_per_xbase: + sample_snp_count_per_xbase[xbase_location] = sample_snp_count_per_xbase[xbase_location] + 1 + else: + sample_snp_count_per_xbase[xbase_location] = 1 + + elif alt_allele_count != 0 and xbase_location not in sample_snp_count_per_xbase: + sample_snp_count_per_xbase[xbase_location] = 0 + + mean_zero_snp_count_per_chromosome = {} + for location in sample_snp_count_per_xbase: + chromosome = location.split(':')[0] + sample_count = sample_snp_count_per_xbase[location] + if chromosome in mean_zero_snp_count_per_chromosome: + mean_zero_snp_count_per_chromosome[chromosome].append(sample_count) + else: + mean_zero_snp_count_per_chromosome[chromosome] = [sample_count] + + for chromosome in mean_zero_snp_count_per_chromosome: + summa = sum(mean_zero_snp_count_per_chromosome[chromosome]) + count = len(mean_zero_snp_count_per_chromosome[chromosome]) + + mean_zero_snp_count_per_chromosome[chromosome] = Decimal(summa) / Decimal(count) + + return mean_zero_snp_count_per_chromosome + +def get_zero_snp_count_per_xbase(pileup_info = None, xbase = 1000000): + zero_snp_count_per_xbase = {} + + for location in pileup_info: + alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit = pileup_info[location] + + location_info = location.split(':') + chromosome = location_info[0] + position = location_info[1] + xbase_position = (int(position) / xbase) + 1 + xbase_location = chromosome + ":" + str(xbase_position) + + if alt_allele_count == 0: + if xbase_location in zero_snp_count_per_xbase: + zero_snp_count_per_xbase[xbase_location] = zero_snp_count_per_xbase[xbase_location] + 1 + else: + zero_snp_count_per_xbase[xbase_location] = 1 + + elif alt_allele_count != 0 and xbase_location not in zero_snp_count_per_xbase: + zero_snp_count_per_xbase[xbase_location] = 0 + + return zero_snp_count_per_xbase def parse_pileup(sample_pileup = None, haw_snps = None): i_file = open(sample_pileup, 'rU') @@ -309,14 +461,16 @@ if location in haw_snps: alt_allele, haw_snp_id, mapping_unit = haw_snps[location] ref_allele_count, alt_allele_count = parse_read_bases(read_bases = read_bases, alt_allele = alt_allele) - - getcontext().prec = 6 - ratio = Decimal(alt_allele_count) / Decimal(read_depth) + + if Decimal(read_depth!=0): + getcontext().prec = 6 + ratio = Decimal(alt_allele_count) / Decimal(read_depth) + #ratio = Decimal(alt_allele_count) / Decimal(ref_allele_count) + + pileup_info[location] = (alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit) - pileup_info[location] = (alt_allele_count, ref_allele_count, read_depth, ratio, haw_snp_id, mapping_unit) - - #debug line - #print chromosome, position, read_depth, ref_allele_count, alt_allele_count, ratio, id + #debug line + #print chromosome, position, read_depth, ref_allele_count, alt_allele_count, ratio, id i_file.close()