Genome Analysis Toolkit

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

After apply gatk ApplyBQSR, the total reads become less

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    Gökalp Çelik

    Hi shouweizhang

    Looks like you applied a bed file to the ApplyBQSR step which restricts the reads to be written to those regions. We do not recommend that practice, therefore if you remove that bed file from the ApplyBQSR step your reads will be the same before and after. 

    Regards. 

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    shouweizhang

    Thank you!  When i removed this parameter "-L", the bam before and after BQSR have the same reads.

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