We’re moving the GATK website, docs and forum to a new platform. Read the full story and breakdown of key changes on this blog.
If you happen to see a question you know the answer to, please do chime in and help your fellow community members. We encourage our fourm members to be more involved, jump in and help out your fellow researchers with their questions. GATK forum is a community forum and helping each other with using GATK tools and research is the cornerstone of our success as a genomics research community.We appreciate your help!
Test-drive the GATK tools and Best Practices pipelines on Terra
Check out this blog post to learn how you can get started with GATK and try out the pipelines in preconfigured workspaces (with a user-friendly interface!) without having to install anything.
Unified Genotyper: Minimum fraction for SNPs
In working with a mapping that has a very large coverage in certain places, I have noticed that the Unified Genotyper often calls SNPs even if the alternate allele is only present in a minuscule <1% fraction of the reads at a position. It is difficult to filter these SNPs out because QUAL is high for these SNPs the and QD, which is low in these situations, is also low for many other (good) SNPs.
There already is a fractional threshold option for indel calling, -minIndelFrac. Is there any similar option for SNPs – and if not, what is your reasoning for omitting this option and what steps do you recommend for filtering out these SNPs?