A search for modifying genetic factors in CHEK2:c.1100delC breast cancer patients

Abstract The risk of breast cancer associated with CHEK2:c.1100delC is 2–threefold but higher in carriers with a family history of breast cancer than without, suggesting that other genetic loci in combination with CHEK2:c.1100delC confer an increased risk in a polygenic model. Part of the excess fam...

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Autores principales: Camilla Wendt, Taru A. Muranen, Lotta Mielikäinen, Jessada Thutkawkorapin, Carl Blomqvist, Xiang Jiao, Hans Ehrencrona, Emma Tham, Brita Arver, Beatrice Melin, Ekaterina Kuchinskaya, Marie Stenmark Askmalm, Ylva Paulsson-Karlsson, Zakaria Einbeigi, Anna von Wachenfeldt Väppling, Eija Kalso, Tiina Tasmuth, Anne Kallioniemi, Kristiina Aittomäki, Heli Nevanlinna, Åke Borg, Annika Lindblom
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/602994982db2421bbe135a9df5feb72b
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Sumario:Abstract The risk of breast cancer associated with CHEK2:c.1100delC is 2–threefold but higher in carriers with a family history of breast cancer than without, suggesting that other genetic loci in combination with CHEK2:c.1100delC confer an increased risk in a polygenic model. Part of the excess familial risk has been associated with common low-penetrance variants. This study aimed to identify genetic loci that modify CHEK2:c.1100delC-associated breast cancer risk by searching for candidate risk alleles that are overrepresented in CHEK2:c.1100delC carriers with breast cancer compared with controls. We performed whole-exome sequencing in 28 breast cancer cases with germline CHEK2:c.1100delC, 28 familial breast cancer cases and 70 controls. Candidate alleles were selected for validation in larger cohorts. One recessive synonymous variant, rs16897117, was suggested, but no overrepresentation of homozygous CHEK2:c.1100delC carriers was found in the following validation. Furthermore, 11 non-synonymous candidate alleles were suggested for further testing, but no significant difference in allele frequency could be detected in the validation in CHEK2:c.1100delC cases compared with familial breast cancer, sporadic breast cancer and controls. With this method, we found no support for a CHEK2:c.1100delC-specific genetic modifier. Further studies of CHEK2:c.1100delC genetic modifiers are warranted to improve risk assessment in clinical practice.