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Article Abstract

Background: Monoallelic germline pathogenic variants (GPVs) in five Fanconi anemia (FA) genes (BRCA1/FANCS, BRCA2/FANCD1, PALB2/FANCN, BRIP1/FANCJ, and RAD51C/FANCO) confer an increased risk of breast (BC) and/or ovarian (OC) cancer, but the role of GPVs in 17 other FA genes remains unclear.

Methods: Here, we investigated the association of germline variants in FANCG/XRCC9 with BC and OC risk.

Results: The frequency of truncating GPVs in FANCG did not differ between BC (20/10,204; 0.20%) and OC (8/2966; 0.27%) patients compared to controls (6/3250; 0.18%). In addition, only one out of five tumor samples showed loss-of-heterozygosity of the wild-type FANCG allele. Finally, none of the nine functionally tested rare recurrent missense FANCG variants impaired DNA repair activities (FANCD2 monoubiquitination and FANCD2 foci formation) upon DNA damage, in contrast to all tested FANCG truncations.

Conclusion: Our study suggests that heterozygous germline FANCG variants are unlikely to contribute to the development of BC or OC.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11327753PMC
http://dx.doi.org/10.1002/cam4.70103DOI Listing

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Article Synopsis
  • Monoallelic germline pathogenic variants in certain Fanconi anemia genes are known to increase breast and ovarian cancer risk, but the effects of variants in FANCG/XRCC9 remain unclear.
  • Researchers found that the frequency of truncating variants in FANCG did not significantly differ between breast cancer, ovarian cancer patients, and controls.
  • The study concludes that heterozygous germline FANCG variants are unlikely to play a role in developing breast or ovarian cancer.
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