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GenotypeVCFs provide wrong AC value ?

I did HaplotypeCaller + genotypeVCFs on 4 sample bam files (with low coverage/depth).
I saw that AC INFO field do not represent the sum of all alternate allele seen.

grep -we rs10753352 -we rs80146807 -we rs707592 trisomie.vcf
chr1    5184689 rs10753352      G       C       147.81  .       AC=4;AF=0.667;AN=6;DB;DP=7;FS=0.000;GQ_MEAN=6.00;GQ_STDDEV=6.00;MLEAC=5;MLEAF=0.833;MQ=93.02;MQ0=0;NCC=1;QD=24.64     GT:AD:DP:GQ:PL  1/1:0,4:4:12:116,12,0   ./.:0,0:0       1/1:0,2:2:6:59,6,0      0/0:1,0:1:0:0,0,8
chr1    5730409 rs80146807      G       T       142.09  .       AC=5;AF=0.625;AN=8;BaseQRankSum=0.804;ClippingRankSum=0.804;DB;DP=6;FS=0.000;GQ_MEAN=12.75;GQ_STDDEV=17.56;MLEAC=5;MLEAF=0.625;MQ=82.96;MQ0=0;MQRankSum=0.804;NCC=0;QD=26.86;ReadPosRankSum=0.804     GT:AD:DP:GQ:PL  0/0:1,0:1:3:0,3,45      1/1:0,1:1:3:45,3,0      1/1:0,2:2:6:90,6,0   0/1:1,1:2:39:39,0,62
chr1    5732382 rs707592        T       C       194.63  .       AC=5;AF=0.833;AN=6;BaseQRankSum=-7.360e-01;ClippingRankSum=0.736;DB;DP=9;FS=8.451;GQ_MEAN=13.33;GQ_STDDEV=8.08;MLEAC=5;MLEAF=0.833;MQ=26.49;MQ0=0;MQRankSum=0.736;NCC=1;QD=32.44;ReadPosRankSum=0.736 GT:AD:DP:GQ:PL  ./.:0,0:0       1/1:0,4:4:12:149,12,0   0/1:2,1:3:22:22,0,49    1/1:0,2:2:6:53,6,0

I join the corresponding ##GATKCommandLine in case.

If I misunderstand what AC is, feel free to teach me.


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