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Variant Discovery in High-Throughput Sequencing Data

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Developed in the Data Sciences Platform at the Broad Institute, the toolkit offers a wide variety of tools with a primary focus on variant discovery and genotyping. Its powerful processing engine and high-performance computing features make it capable of taking on projects of any size. Learn more

Mutect2 Calls for non-tumor pooled samples - no variants pass filters

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    Gökalp Çelik

    Hi Ren Hamm

    Since you are using Mutect2 to call variants with allelic fractions in your pooled samples there is no need for adjusting ploidy for your samples. You might want to enable high sensitivity settings for Mutect2 to call very low fraction calls. We enable these settings under --mitochondria-mode so you can enable that mode to call and filter variant calls for your case. 

    Hard filtering with Mutect2 calls is not a recommended step as Mutect2's dynamics are different from germline. 

    If you can try with the mitochondria mode you may be able to get a better result for your variants. 

    I hope this helps. 

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    Ren Hamm

    I was able to successfully run everything in -mitochondia-mode, but FilterMutectCalls is still failing with the same error:

    java.lang.IllegalArgumentException: alpha must be greater than 0 but got NaN

     

    How should I approach solving this?

     

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    Gökalp Çelik

    Hi again.

    Can you try without additional mapping and base quality filters in FilterMutectCalls step?

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    Ren Hamm

    I ran everything again after removing all the additional filter parameters, and I am still recieving the same error.

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    Gökalp Çelik

    Hi Ren Hamm

    Can you tell us about how these samples were processed before Mutect2? Are these of DNA or RNA origin? What aligner did you use to map reads?

    The answer could be lying somewere along those lines.

     

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    Ren Hamm

    Of course! This DNA data is from WGS 150bp paired-end Illumina reads, which were aligned using BWA-mem. 

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    Gökalp Çelik

    Hi again.

    Did you happen to build GATK from source? It may be possible that you might have picked a source that is not fully tested. Can you try downloading the latest build and see if the problem still exitsts?

    Regards. 

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