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Modeling tissue-specific breakpoint proximity of structural variations from whole-genomes to identify cancer drivers

Alexander Martinez-Fundichely (), Austin Dixon and Ekta Khurana ()
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Alexander Martinez-Fundichely: Weill Cornell Medicine
Austin Dixon: Weill Cornell Medicine
Ekta Khurana: Weill Cornell Medicine

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Structural variations (SVs) in cancer cells often impact large genomic regions with functional consequences. However, identification of SVs under positive selection is a challenging task because little is known about the genomic features related to the background breakpoint distribution in different cancers. We report a method that uses a generalized additive model to investigate the breakpoint proximity curves from 2,382 whole-genomes of 32 cancer types. We find that a multivariate model, which includes linear and nonlinear partial contributions of various tissue-specific features and their interaction terms, can explain up to 57% of the observed deviance of breakpoint proximity. In particular, three-dimensional genomic features such as topologically associating domains (TADs), TAD-boundaries and their interaction with other features show significant contributions. The model is validated by identification of known cancer genes and revealed putative drivers in cancers different than those with previous evidence of positive selection.

Date: 2022
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DOI: 10.1038/s41467-022-32945-2

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