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

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 NevanlinnaÅke Borg, Annika Lindblom

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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.

Original languageEnglish
Article number14763
JournalScientific Reports
Publication statusPublished - Jul 2021
Publication typeA1 Journal article-refereed

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • General


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