Detection of homozygous deletions in tumor-suppressor genes ranging from dozen to hundreds nucleotides in cancer models

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Abstract

Tumor-suppressor genes can be inactivated by several mechanisms and, in a majority of cases, both alleles need to be affected. One of the mechanisms of inactivation is due to deletions ranging from dozen to hundreds of nucleotides; such deletions are often missed by variant callers. HomDelDetect is a method to detect such homozygous deletions in cancer models, such as cancer cell lines and potentially patient tumor-derived xenografts. This method can be applied to partial exome, whole-exome sequencing, whole-genome sequencing, and RNA-seq data. We applied our method across a panel of CCLE cancer cell lines and observed good concordance with SNP array-based analysis and also detected deletions that have been missed by variant callers and by SNP arrays, demonstrating the ability of HomDelDetect to improve the annotations of tumor-suppressor genes in cancer models.

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Chang, L. C., Vural, S., & Sonkin, D. (2017). Detection of homozygous deletions in tumor-suppressor genes ranging from dozen to hundreds nucleotides in cancer models. Human Mutation, 38(11), 1449–1453. https://doi.org/10.1002/humu.23308

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