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cal_AI_3pop.py
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cal_AI_3pop.py
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# -*- coding: utf-8 -*-
"""
Created on Thu Nov 26 15:35:14 2020
@author: YudongCai
@Email: [email protected]
"""
import allel
import click
import numpy as np
import pandas as pd
def select_samples(samples_all, samples_query):
"""
从samples_all里面筛选samples_query，产生布尔掩码
"""
return [True if sample in samples_query else False for sample in samples_all]
def load_vcf2array(vcffile, samples_queried, outsamples: None):
callset = allel.read_vcf(vcffile, samples=samples_queried,
fields=['samples', 'calldata/GT', 'variants/CHROM', 'variants/POS'])
gt_array = callset['calldata/GT'] # 三维array
samples_all = callset['samples']
pos_array = callset['variants/POS']
chrom_array = callset['variants/CHROM']
# 样本是否都在vcf里
if len(samples_queried) != len(samples_all):
samples_notexist = set(samples_queried) - set(samples_all)
print(f'{len(samples_notexist)} samples not exist in the vcf file:')
print(', '.join(samples_notexist))
# 只保留双等位, 多等位以后再考虑
selection_biallelic = np.max(np.max(gt_array, axis=2), axis=1) < 2
gt_array = gt_array[selection_biallelic, :, :]
pos_array = pos_array[selection_biallelic]
chrom_array = chrom_array[selection_biallelic]
n_sites, n_samples, n_hap = gt_array.shape
print(f'{n_sites} biallelic sites were remained.')
# 把outsamples中最高频率的allele设置为alt
if outsamples:
selection_outsamples = select_samples(samples_all, outsamples)
print(f'{np.sum(selection_outsamples)} outgroup samples in vcf file.')
gt_array_out = gt_array[:, selection_outsamples, :].reshape(n_sites, np.sum(selection_outsamples)*n_hap)
selection_swtich = np.sum(gt_array_out==0, axis=1) > np.sum(gt_array_out>0, axis=1) # ref(0)的数量比非ref(!=0)但不是miss(-1)的数量多
print(f'Swtich REF and ALT in {np.sum(selection_swtich)} sites.')
assert gt_array.min() >= -1
assert gt_array.max() <= 1
gt_swtich = gt_array[selection_swtich, :, :]
gt_swtich[gt_swtich == 1] = 9
gt_swtich[gt_swtich == 0] = 1
gt_swtich[gt_swtich == 9] = 0
gt_array[selection_swtich, :, :] = gt_swtich
return gt_array, callset['samples'], pos_array, chrom_array
def cal_alt1_freq(gt_array):
"""
gt_array为load_vcf2array产生的3维ndarray
注意，返回的是第一个ALT的frequency
"""
return allel.GenotypeArray(gt_array).count_alleles().to_frequencies()[:, 1]
@click.command()
@click.option('--vcffile', help='输入的vcf文件')
@click.option('--popa', help='群体A(非渗入群体)的ID列表，一行一个')
@click.option('--popb', help='群体B(被渗入群体)的ID列表，一行一个')
@click.option('--popc', help='群体C(渗入来源群体)的ID列表，一行一个')
@click.option('--binwidth', type=int, default=50000, help='滑动窗口大小')
@click.option('--stepsize', type=int, default=10000, help='滑动窗口步长')
@click.option('--outprefix', help='输出文件前缀')
def main(vcffile, popa, popb, popc, binwidth, stepsize, outprefix):
"""
U_A,B,C(w,x,y)
A是非渗入群体，B是被渗入群体，C是渗入来源群体
在窗口内A中频率小于w，B中大于x，C中大于y的SNP位点数即为U_A,B,C(w,x,y)
详见：Signatures of Archaic Adaptive Introgression in Present-Day Human Populations
"""
samples_popA = [x.strip() for x in open(popa)]
samples_popB = [x.strip() for x in open(popb)]
samples_popC = [x.strip() for x in open(popc)]
samples_queried = samples_popA + samples_popB + samples_popC
assert len(set(samples_queried)) == len(samples_queried), "样本ID有重复"
gt_array, samples_all, pos_array, chrom_array = load_vcf2array(vcffile, samples_queried, outsamples=samples_popC)
# 群体C频率
selection_popC = select_samples(samples_all, samples_popC)
af_popC = cal_alt1_freq(gt_array[:, selection_popC, :]) # 这个返回的是第一个ALT的frequency
# 只保留群体C中频率百分百的位点, ALT按popC转换过了，所以直接算ALT的频率
selection_freq_popC = af_popC == 1
gt_array = gt_array[selection_freq_popC, :, :]
pos_array = pos_array[selection_freq_popC]
chrom_array = chrom_array[selection_freq_popC]
af_popC = af_popC[selection_freq_popC]
# 群体AB的频率，使用筛选后的位点计算
selection_popA = select_samples(samples_all, samples_popA)
af_popA = cal_alt1_freq(gt_array[:, selection_popA, :]) # 这个返回的是第一个ALT的frequency
selection_popB = select_samples(samples_all, samples_popB)
af_popB = cal_alt1_freq(gt_array[:, selection_popB, :]) # 这个返回的是第一个ALT的frequency
# 先把频率文件保存一下
df = pd.DataFrame({'chrom': chrom_array, 'pos': pos_array, 'popA': af_popA, 'popB': af_popB, 'popC': af_popC})
df.to_csv(f'{outprefix}_altFreq.tsv.gz', index=False, compression='gzip', sep='\t', float_format='%.3f')
print('freq file saved.')
# 过滤满足指标要求的位点
selection_popA_1percent = df['popA'].values < 0.01
df = df.iloc[selection_popA_1percent, :]
selection_popC_1percent = df['popC'].values == 1
df = df.iloc[selection_popC_1percent, :]
print(f'{df.shape[0]} sites remained after frequency filtering.')
# 滑动窗口计算统计量
odf = []
for offset in range(0, binwidth, stepsize):
df['bin_index'] = ((df['pos'].values - 1) - offset) // binwidth
for group_name, gdf in df.groupby(by=['chrom', 'bin_index']):
chrom, bin_index = group_name
start = bin_index * binwidth + offset + 1
if start < 0: # 开头几个窗口长度不足的就直接跳过
continue
end = start + binwidth - 1
n_snp = gdf.shape[0]
print(chrom, start, end, n_snp)
# Q_1_100_q90, Q_1_100_q95, Q_1_100_q100 = np.quantile(gdf['popB'].values, [0.9, 0.95, 1]) # A和B群体的频率已经提前过滤了 New in version 1.15.0.
Q_1_100_q90, Q_1_100_q95, Q_1_100_q100 = np.percentile(gdf['popB'].values, [90, 95, 100])
U_1_10_100 = np.sum(gdf['popB'].values >= 0.1)
U_1_20_100 = np.sum(gdf['popB'].values >= 0.2)
U_1_50_100 = np.sum(gdf['popB'].values >= 0.5)
U_1_80_100 = np.sum(gdf['popB'].values >= 0.8)
odf.append([chrom, start, end, n_snp, Q_1_100_q90, Q_1_100_q95, Q_1_100_q100, U_1_10_100, U_1_20_100, U_1_50_100, U_1_80_100])
odf = pd.DataFrame(odf, columns=['chrom', 'start', 'end', 'n_snp', 'Q90', 'Q95', 'Q100', 'U10', 'U20', 'U50', 'U80']).sort_values(by=['chrom', 'start'])
odf.to_csv(f'{outprefix}_stat.tsv.gz', index=False, compression='gzip', sep='\t', float_format='%.3f')
if __name__ == '__main__':
main()