title: An empirical Bayesian framework for somatic mutation detection from cancer genome sequencing data.
abstract: Recent advances in high-throughput sequencing technologies have enabled a comprehensive dissection of the cancer genome clarifying a large number of somatic mutations in a wide variety of cancer types. A number of methods have been proposed for mutation calling based on a large amount of sequencing data, which is accomplished in most cases by statistically evaluating the difference in the observed allele frequencies of possible single nucleotide variants between tumours and paired normal samples. However, an accurate detection of mutations remains a challenge under low sequencing depths or tumour contents. To overcome this problem, we propose a novel method, Empirical Bayesian mutation Calling (https://github.com/friend1ws/EBCall), for detecting somatic mutations. Unlike previous methods, the proposed method discriminates somatic mutations from sequencing errors based on an empirical Bayesian framework, where the model parameters are estimated using sequencing data from multiple non-paired normal samples. Using 13 whole-exome sequencing data with 87.5-206.3 mean sequencing depths, we demonstrate that our method not only outperforms several existing methods in the calling of mutations with moderate allele frequencies but also enables accurate calling of mutations with low allele frequencies (≤ 10%) harboured within a minor tumour subpopulation, thus allowing for the deciphering of fine substructures within a tumour specimen.
authors.affiliation: Laboratory of DNA Information Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan. yshira@hgc.jp
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Shiraishi
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Sato
authors.forename: Kenichi
authors.initials: K
authors.lastname: Chiba
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Okuno
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Nagata
authors.forename: Kenichi
authors.initials: K
authors.lastname: Yoshida
authors.forename: Norio
authors.initials: N
authors.lastname: Shiba
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Haruki
authors.initials: H
authors.lastname: Kume
authors.forename: Yukio
authors.initials: Y
authors.lastname: Homma
authors.forename: Masashi
authors.initials: M
authors.lastname: Sanada
authors.forename: Seishi
authors.initials: S
authors.lastname: Ogawa
authors.forename: Satoru
authors.initials: S
authors.lastname: Miyano
mesh_terms: D000465:Algorithms; D001499:Bayes Theorem; D004252:DNA Mutational Analysis / Q000379:methods*; D005787:Gene Frequency; D023281:Genomics; D059014:High-Throughput Nucleotide Sequencing; D006801:Humans; D009369:Neoplasms / Q000235:genetics*