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Breast Cancer Research
Published in: Breast Cancer Research 1/2018

Open Access 01-12-2018 | Research Article

Evaluating the breast cancer predisposition role of rare variants in genes associated with low-penetrance breast cancer risk SNPs

Authors: Na Li, Simone M. Rowley, Ella R. Thompson, Simone McInerny, Lisa Devereux, Kaushalya C. Amarasinghe, Magnus Zethoven, Richard Lupat, David Goode, Jason Li, Alison H. Trainer, Kylie L. Gorringe, Paul A. James, Ian G. Campbell

Published in: Breast Cancer Research | Issue 1/2018

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Abstract

Background

Genome-wide association studies (GWASs) have identified numerous single-nucleotide polymorphisms (SNPs) associated with small increases in breast cancer risk. Studies to date suggest that some SNPs alter the expression of the associated genes, which potentially mediates risk modification. On this basis, we hypothesised that some of these genes may be enriched for rare coding variants associated with a higher breast cancer risk.

Methods

The coding regions and exon-intron boundaries of 56 genes that have either been proposed by GWASs to be the regulatory targets of the SNPs and/or located < 500 kb from the risk SNPs were sequenced in index cases from 1043 familial breast cancer families that previously had negative test results for BRCA1 and BRCA2 mutations and 944 population-matched cancer-free control participants from an Australian population. Rare (minor allele frequency ≤ 0.001 in the Exome Aggregation Consortium and Exome Variant Server databases) loss-of-function (LoF) and missense variants were studied.

Results

LoF variants were rare in both the cases and control participants across all the candidate genes, with only 38 different LoF variants observed in a total of 39 carriers. For the majority of genes (n = 36), no LoF variants were detected in either the case or control cohorts. No individual gene showed a significant excess of LoF or missense variants in the cases compared with control participants. Among all candidate genes as a group, the total number of carriers with LoF variants was higher in the cases than in the control participants (26 cases and 13 control participants), as was the total number of carriers with missense variants (406 versus 353), but neither reached statistical significance (p = 0.077 and p = 0.512, respectively). The genes contributing most of the excess of LoF variants in the cases included TET2, NRIP1, RAD51B and SNX32 (12 cases versus 2 control participants), whereas ZNF283 and CASP8 contributed largely to the excess of missense variants (25 cases versus 8 control participants).

Conclusions

Our data suggest that rare LoF and missense variants in genes associated with low-penetrance breast cancer risk SNPs may contribute some additional risk, but as a group these genes are unlikely to be major contributors to breast cancer heritability.
Appendix
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Metadata
Title
Evaluating the breast cancer predisposition role of rare variants in genes associated with low-penetrance breast cancer risk SNPs
Authors
Na Li
Simone M. Rowley
Ella R. Thompson
Simone McInerny
Lisa Devereux
Kaushalya C. Amarasinghe
Magnus Zethoven
Richard Lupat
David Goode
Jason Li
Alison H. Trainer
Kylie L. Gorringe
Paul A. James
Ian G. Campbell
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 1/2018
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/s13058-017-0929-z

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