de novo variant calling identifies cancer mutation signatures in the 1000 Genomes Project

Jeffrey K. Ng, Pankaj Vats, Elyn Fritz-Waters, Stephanie Sarkar, Eleanor I. Sams, Evin M. Padhi, Zachary L. Payne, Shawn Leonard, Marc A. West, Chandler Prince, Lee Trani, Marshall Jansen, George Vacek, Mehrzad Samadi, Timothy T. Harkins, Craig Pohl, Tychele N. Turner

Research output: Contribution to journalArticlepeer-review

Abstract

Detection of de novo variants (DNVs) is critical for studies of disease-related variation and mutation rates. To accelerate DNV calling, we developed a graphics processing units-based workflow. We applied our workflow to whole-genome sequencing data from three parent-child sequenced cohorts including the Simons Simplex Collection (SSC), Simons Foundation Powering Autism Research (SPARK), and the 1000 Genomes Project (1000G) that were sequenced using DNA from blood, saliva, and lymphoblastoid cell lines (LCLs), respectively. The SSC and SPARK DNV callsets were within expectations for number of DNVs, percent at CpG sites, phasing to the paternal chromosome of origin, and average allele balance. However, the 1000G DNV callset was not within expectations and contained excessive DNVs that are likely cell line artifacts. Mutation signature analysis revealed 30% of 1000G DNV signatures matched B-cell lymphoma. Furthermore, we found variants in DNA repair genes and at Clinvar pathogenic or likely-pathogenic sites and significant excess of protein-coding DNVs in IGLL5; a gene known to be involved in B-cell lymphomas. Our study provides a new rapid DNV caller for the field and elucidates important implications of using sequencing data from LCLs for reference building and disease-related projects.

Original languageEnglish
Pages (from-to)1979-1993
Number of pages15
JournalHuman mutation
Volume43
Issue number12
DOIs
StatePublished - Dec 2022

Keywords

  • 1000 Genomes Project
  • GPU accelerated workflow
  • Simons Simplex Collection
  • cell line artifacts
  • de novo variants

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