A recessive variant of XRCC4 predisposes to non- BRCA1/2 breast cancer in chinese women and impairs the DNA damage response via dysregulated nuclear localization.

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He, Min
Hu, Xin
Chen, Li
Cao, A-Yong
Yu, Ke-Da
Shi, Ting-Yan
Kuang, Xia-Ying
Shi, Wen-Biao
Ling, Hong
Li, Shan

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XRCC4 plays a crucial role in the non-homologous end joining pathway that maintains genome stability. In this two-stage case-control study with 1,764 non-BRCA1/2 breast cancer patients and 1,623 cancer-free controls, we investigated the contribution of genetic variants of XRCC4 to breast cancer susceptibility in Chinese women. We identified a recessive missense variant, rs3734091 (c.739G>T, p.Ala247Ser), of XRCC4 that was significantly associated with an increased risk of breast cancer (odds ratio [OR] = 3.92, P = 0.007), particularly with the risk of developing triple-negative breast cancer (OR = 18.65, P < 0.0001). This p.Ala247Ser variant disturbed the nuclear localization of XRCC4 in cells homozygous for the rs3734091-T allele but not in heterozygous cells at both the cellular and tissue levels. In heterozygous cells, wild-type XRCC4 facilitated the nuclear localization of the XRCC4A247S mutant, thus compensating for the impaired localization of XRCC4A247S. This provided a biological mechanism by which rs3734091 conferred an increased susceptibility to non-BRCA1/2 breast cancer exclusively under a recessive model. Further functional analyses revealed that p.Ala247Ser impaired the DNA damage repair capacity and ultimately perturbed genomic stability. Taken together, our findings document the role of XRCC4 in non-BRCA1/2 breast cancer predisposition and reveal its underlying biological mechanism of action.





Cell Nucleus, Humans, Breast Neoplasms, DNA Damage, Genetic Predisposition to Disease, DNA-Binding Proteins, RNA, Small Interfering, Fluorescent Antibody Technique, Blotting, Western, Comet Assay, Immunohistochemistry, Case-Control Studies, Polymerase Chain Reaction, Immunoprecipitation, Protein Transport, Genotype, Genes, BRCA1, Genes, BRCA2, Asian Continental Ancestry Group, Female


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He, Min, Xin Hu, Li Chen, A-Yong Cao, Ke-Da Yu, Ting-Yan Shi, Xia-Ying Kuang, Wen-Biao Shi, et al. (2014). A recessive variant of XRCC4 predisposes to non- BRCA1/2 breast cancer in chinese women and impairs the DNA damage response via dysregulated nuclear localization. Oncotarget, 5(23). pp. 12218–12232. 10.18632/oncotarget.2623 Retrieved from https://hdl.handle.net/10161/18034.

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Qingyi Wei

Professor in Population Health Sciences

Qingyi Wei, MD, PhD, Professor in the Department of Medicine, is Associate Director for Cancer Control and Population Sciences, Co-leader of CCPS and Co-leader of Epidemiology and Population Genomics (Focus Area 1). He is a professor of Medicine and an internationally recognized epidemiologist focused on the molecular and genetic epidemiology of head and neck cancers, lung cancer, and melanoma. His research focuses on biomarkers and genetic determinants for the DNA repair deficient phenotype and variations in cell death. He is Editor-in-Chief of the open access journal "Cancer Medicine" and Associate Editor-in-Chief of the International Journal of Molecular Epidemiology and Genetics.

Area of Expertise: Epidemiology

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