Downsampling with HaplotypeCaller
Posted in Ask the GATK team | Last updated on


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Hello,

I'm running the Haplotype Caller on 80 bams, multithreaded (-nt 14), with either vcfs or bed files as the intervals file. I am trying to downsample to approximately 200 reads (-dcov 200). However, my output vcfs clearly have much higher depth (over 300-500 reads) in some areas. Also, HC drastically slows down whenever it hits a region of very deep pile-ups (over 1000 reads).

Is there any way to speed up HC on regions of very deep pileups? Is there a way to make downsampling stricter?

Thank you for your help. Elise


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