Variant classification: Difference between revisions
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Created page with "= Introduction = The Variant Call Format (VCF) is a flexible file format specification that allows us to represent many different variant types ranging from SNPs, indels to c..." |
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= Definitions = | = Definitions = | ||
The normalization of a variant representation in VCF consists of two parts: parsimony and left alignment pertaining to the nature of a variant's length and position respectively. | The normalization of a variant representation in VCF consists of two parts: parsimony and left alignment pertaining to the nature of a variant's length and position respectively. | ||
== Example == | |||
Summarizes the variants in a VCF file | |||
<div class=" mw-collapsible mw-collapsed"> | |||
#summarizes the variants found in mills.vcf | |||
vt peek mills.vcf | |||
<div class="mw-collapsible-content"> | |||
usage : vt peek [options] <in.vcf> | |||
options : -o output VCF file [-] | |||
-I file containing list of intervals [] | |||
-i intervals [] | |||
-r reference sequence fasta file [] | |||
-- ignores the rest of the labeled arguments following this flag | |||
-h displays help | |||
</div> | |||
</div> | |||
#This is a sample output of a peek command which summarizes the variants found in a VCF file. | |||
stats: no. of samples : 0 | |||
no. of chromosomes : 22<br> | |||
========== Micro variants ==========<br> | |||
no. of SNPs : 77228885 | |||
2 alleles (ts/tv) : 77011302 (2.11) [52287790/24723512] | |||
3 alleles (ts/tv) : 216560 (0.75) [185520/247600] | |||
4 alleles (ts/tv) : 1023 (0.50) [1023/2046]<br> | |||
no. of MNPs : 0 | |||
2 alleles (ts/tv) : 0 (-nan) [0/0] | |||
>=3 alleles (ts/tv) : 0 (-nan) [0/0]<br> | |||
no. Indels : 2147564 | |||
2 alleles (ins/del) : 2124842 (0.47) [683250/1441592] | |||
>=3 alleles (ins/del) : 22722 (2.12) [32411/15286]<br> | |||
no. SNP/MNP : 0 | |||
3 alleles (ts/tv) : 0 (-nan) [0/0] | |||
>=4 alleles (ts/tv) : 0 (-nan) [0/0] <br> | |||
no. SNP/Indels : 12913 | |||
2 alleles (ts/tv) (ins/del) : 412 (0.41) [120/292] (3.68) [324/88] | |||
>=3 alleles (ts/tv) (ins/del) : 12501 (0.43) [7670/17649] (18.64) [12434/667]<br> | |||
no. MNP/Indels : 153 | |||
2 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0] | |||
>=3 alleles (ts/tv) (ins/del) : 153 (0.30) [138/465] (0.27) [67/248]<br> | |||
no. SNP/MNP/Indels : 2 | |||
3 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0] | |||
4 alleles (ts/tv) (ins/del) : 2 (0.00) [3/5] (1.00) [3/3] | |||
>=5 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0]<br> | |||
no. of clumped variants : 19025 | |||
2 alleles : 0 (-nan) [0/0] (-nan) [0/0] | |||
3 alleles : 18508 (0.16) [12152/75366] (0.00) [93/18653] | |||
4 alleles : 451 (0.15) [369/2390] (0.33) [201/609] | |||
>=5 alleles : 66 (0.09) [37/414] (1.19) [107/90]<br> | |||
====== Other useful categories =====<br> | |||
no. complex variants : 32093 | |||
2 alleles (ts/tv) (ins/del) : 412 (0.41) [120/292] (3.68) [324/88] | |||
>=3 alleles (ts/tv) (ins/del) : 31681 (0.21) [20369/96289] (0.64) [12905/20270]<br> | |||
======= Structural variants ========<br> | |||
no. of structural variants : 41217 | |||
2 alleles : 38079 | |||
deletion : 13135 | |||
insertion : 16451 | |||
mobile element : 16253 | |||
ALU : 12513 | |||
LINE1 : 2911 | |||
SVA : 829 | |||
numt : 198 | |||
duplication : 664 | |||
inversion : 100 | |||
copy number variation : 7729 | |||
>=3 alleles : 3138 | |||
copy number variation : 3138 <br> | |||
========= General summary ========== <br> | |||
no. of reference : 0 <br> | |||
no. of observed variants : 79449759 | |||
no. of unclassified variants : 0 | |||
= Maintained by = | = Maintained by = | ||
This page is maintained by [mailto:atks@umich.edu Adrian]. | This page is maintained by [mailto:atks@umich.edu Adrian]. | ||
Revision as of 10:13, 5 September 2014
Introduction
The Variant Call Format (VCF) is a flexible file format specification that allows us to represent many different variant types ranging from SNPs, indels to copy number variations. However, variant representation in VCF is non-unique for variants that have explicitly expressed reference and alternate sequences.
On this wiki page, we describe a a variant classification system for VCF variants.
Definitions
The normalization of a variant representation in VCF consists of two parts: parsimony and left alignment pertaining to the nature of a variant's length and position respectively.
Example
Summarizes the variants in a VCF file
#summarizes the variants found in mills.vcf vt peek mills.vcf
usage : vt peek [options] <in.vcf>
options : -o output VCF file [-]
-I file containing list of intervals []
-i intervals []
-r reference sequence fasta file []
-- ignores the rest of the labeled arguments following this flag
-h displays help
#This is a sample output of a peek command which summarizes the variants found in a VCF file.
stats: no. of samples : 0
no. of chromosomes : 22
========== Micro variants ==========
no. of SNPs : 77228885
2 alleles (ts/tv) : 77011302 (2.11) [52287790/24723512]
3 alleles (ts/tv) : 216560 (0.75) [185520/247600]
4 alleles (ts/tv) : 1023 (0.50) [1023/2046]
no. of MNPs : 0
2 alleles (ts/tv) : 0 (-nan) [0/0]
>=3 alleles (ts/tv) : 0 (-nan) [0/0]
no. Indels : 2147564
2 alleles (ins/del) : 2124842 (0.47) [683250/1441592]
>=3 alleles (ins/del) : 22722 (2.12) [32411/15286]
no. SNP/MNP : 0
3 alleles (ts/tv) : 0 (-nan) [0/0]
>=4 alleles (ts/tv) : 0 (-nan) [0/0]
no. SNP/Indels : 12913
2 alleles (ts/tv) (ins/del) : 412 (0.41) [120/292] (3.68) [324/88]
>=3 alleles (ts/tv) (ins/del) : 12501 (0.43) [7670/17649] (18.64) [12434/667]
no. MNP/Indels : 153
2 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0]
>=3 alleles (ts/tv) (ins/del) : 153 (0.30) [138/465] (0.27) [67/248]
no. SNP/MNP/Indels : 2
3 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0]
4 alleles (ts/tv) (ins/del) : 2 (0.00) [3/5] (1.00) [3/3]
>=5 alleles (ts/tv) (ins/del) : 0 (-nan) [0/0] (-nan) [0/0]
no. of clumped variants : 19025
2 alleles : 0 (-nan) [0/0] (-nan) [0/0]
3 alleles : 18508 (0.16) [12152/75366] (0.00) [93/18653]
4 alleles : 451 (0.15) [369/2390] (0.33) [201/609]
>=5 alleles : 66 (0.09) [37/414] (1.19) [107/90]
====== Other useful categories =====
no. complex variants : 32093
2 alleles (ts/tv) (ins/del) : 412 (0.41) [120/292] (3.68) [324/88]
>=3 alleles (ts/tv) (ins/del) : 31681 (0.21) [20369/96289] (0.64) [12905/20270]
======= Structural variants ========
no. of structural variants : 41217
2 alleles : 38079
deletion : 13135
insertion : 16451
mobile element : 16253
ALU : 12513
LINE1 : 2911
SVA : 829
numt : 198
duplication : 664
inversion : 100
copy number variation : 7729
>=3 alleles : 3138
copy number variation : 3138
========= General summary ==========
no. of reference : 0
no. of observed variants : 79449759
no. of unclassified variants : 0
Maintained by
This page is maintained by Adrian.
