Detecting SNV in human populations

Hello Geraldine,

First thank you a lot for your amazing work on this forum. My project deals with discovering rare population-specific variants in human exomes, and I would like to know how the VQSR step would affect the discovery of these variants. I was wondering whether it is better to perform VQSR on all the populations together (420 individuals but with a risk to clean out "true" rare population-specific variants ) or to run it by population (between 30 and 100 individuals each but I read that VQSR is loosing power with a reduced number of samples) ?

Thank you for your help,
Best
Marie

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  • tommycarstensentommycarstensen United KingdomMember

    @Lopez_Marie I had a very similar case with 420 samples distributed across 4 populations. I did various combinations. I found that calling and filtering the populations together yielded a slightly better result in terms of sensitivity and specificity. I agree with the recommendation from @Geraldine_VdAuwera.

  • Many thanks to both of you for your quick support ! Have a great day.

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