2 .TH vcf 5 "August 2013" "htslib" "Bioinformatics formats"
4 vcf \- Variant Call Format
6 .\" Copyright (C) 2011 Broad Institute.
7 .\" Copyright (C) 2013 Genome Research Ltd.
9 .\" Author: Heng Li <lh3@sanger.ac.uk>
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30 The Variant Call Format (VCF) is a TAB-delimited format with each data line
31 consisting of the following fields:
34 1 CHROM CHROMosome name
35 2 POS the left-most POSition of the variant
36 3 ID unique variant IDentifier
37 4 REF the REFerence allele
38 5 ALT the ALTernate allele(s) (comma-separated)
39 6 QUAL variant/reference QUALity
40 7 FILTER FILTERs applied
41 8 INFO INFOrmation related to the variant (semicolon-separated)
42 9 FORMAT FORMAT of the genotype fields (optional; colon-separated)
43 10+ SAMPLE SAMPLE genotypes and per-sample information (optional)
46 The following table gives the \fBINFO\fP tags used by samtools and bcftools.
49 Max-likelihood estimate of the site allele frequency (AF) of the first ALT allele
53 Raw read depth (without quality filtering)
57 # high-quality reference forward bases, ref reverse, alternate for and alt rev bases
61 Consensus quality. Positive: sample genotypes different; negative: otherwise
65 Root-Mean-Square mapping quality of covering reads
69 Phred probability of AF in group1 samples being larger (,smaller) than in group2
73 Posterior weighted chi^2 P-value between group1 and group2 samples
77 P-value for strand bias, baseQ bias, mapQ bias and tail distance bias
85 # permutations yielding a smaller PCHI2
89 Phred log ratio of genotype likelihoods with and without the trio/pair constraint
93 Most probable genotype configuration without the trio constraint
97 Most probable configuration with the trio constraint
101 Tests variant positions within reads. Intended for filtering RNA-seq artifacts around splice sites
105 Mann-Whitney rank-sum test for tail distance bias
109 Hardy-Weinberg equilibrium test (Wigginton et al)
114 https://github.com/samtools/hts-specs
115 The full VCF/BCF file format specification
117 .I A note on exact tests of Hardy-Weinberg equilibrium
120 .\" (http://www.ncbi.nlm.nih.gov/pubmed/15789306)