Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats
Abstract Tumor suppressor BRCA2 executes homologous recombination to repair DNA double-strand breaks in collaboration with RAD51, involving exon 11 and 27. Exon 11 constitutes a region where pathogenic variants (PVs) accumulate, and mutations in this region are known to contribute to carcinogenesis....
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Nature Portfolio
2025-01-01
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| Online Access: | https://doi.org/10.1038/s41598-024-84184-8 |
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| author | Yashiro Motooka Hideaki Tanaka Yuki Maeda Misako Katabuchi Tomoji Mashimo Shinya Toyokuni |
| author_facet | Yashiro Motooka Hideaki Tanaka Yuki Maeda Misako Katabuchi Tomoji Mashimo Shinya Toyokuni |
| author_sort | Yashiro Motooka |
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| description | Abstract Tumor suppressor BRCA2 executes homologous recombination to repair DNA double-strand breaks in collaboration with RAD51, involving exon 11 and 27. Exon 11 constitutes a region where pathogenic variants (PVs) accumulate, and mutations in this region are known to contribute to carcinogenesis. However, the impact of the heterozygous PVs of BRCA2 exon 11 on the life quality beyond cancer risk, including male fertility, remains unclear. Here, we established a rat model with a frameshift on the seventh BRC repeat in Brca2 exon 11 (Brca2 +/p.T1942fs), which is homologous to human BRCA2 +/p.T1974fs, using CRISPR/Cas9 system. Our analyses revealed that the heterozygous rats with the PV in the BRCA2 exon 11 showed increased DNA double-strand breaks and apoptosis in spermatogonia and spermatocytes, accelerated testicular germ cell loss, and deterioration in sperm quality according with aging, ultimately resulting in early male reproductive dysfunction. Of note, these alterations in testes and sperm, including DNA fragmentation in spermatozoa, were observed from completion of sexual maturation. The present findings suggest that it is crucial to consider not only cancer risk but also potential declines in reproductive capacity in men carrying BRCA2 exon 11 PVs. Further investigation is warranted to determine whether similar traits appear in humans. |
| format | Article |
| id | doaj-art-a4f8692d33a642efa4439f54bfabf929 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-a4f8692d33a642efa4439f54bfabf9292025-01-05T12:18:15ZengNature PortfolioScientific Reports2045-23222025-01-0115111710.1038/s41598-024-84184-8Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in ratsYashiro Motooka0Hideaki Tanaka1Yuki Maeda2Misako Katabuchi3Tomoji Mashimo4Shinya Toyokuni5Department of Pathology and Biological Responses, Nagoya University Graduate School of MedicineDepartment of Pathology and Biological Responses, Nagoya University Graduate School of MedicineDepartment of Pathology and Biological Responses, Nagoya University Graduate School of MedicineDepartment of Pathology and Biological Responses, Nagoya University Graduate School of MedicineLaboratory Animal Research Center, Institute of Medical Science, The University of TokyoDepartment of Pathology and Biological Responses, Nagoya University Graduate School of MedicineAbstract Tumor suppressor BRCA2 executes homologous recombination to repair DNA double-strand breaks in collaboration with RAD51, involving exon 11 and 27. Exon 11 constitutes a region where pathogenic variants (PVs) accumulate, and mutations in this region are known to contribute to carcinogenesis. However, the impact of the heterozygous PVs of BRCA2 exon 11 on the life quality beyond cancer risk, including male fertility, remains unclear. Here, we established a rat model with a frameshift on the seventh BRC repeat in Brca2 exon 11 (Brca2 +/p.T1942fs), which is homologous to human BRCA2 +/p.T1974fs, using CRISPR/Cas9 system. Our analyses revealed that the heterozygous rats with the PV in the BRCA2 exon 11 showed increased DNA double-strand breaks and apoptosis in spermatogonia and spermatocytes, accelerated testicular germ cell loss, and deterioration in sperm quality according with aging, ultimately resulting in early male reproductive dysfunction. Of note, these alterations in testes and sperm, including DNA fragmentation in spermatozoa, were observed from completion of sexual maturation. The present findings suggest that it is crucial to consider not only cancer risk but also potential declines in reproductive capacity in men carrying BRCA2 exon 11 PVs. Further investigation is warranted to determine whether similar traits appear in humans.https://doi.org/10.1038/s41598-024-84184-8BRCA2 exon 11Pathogenic variantHeterozygoteSpermatogenesisAgingMale subfertility |
| spellingShingle | Yashiro Motooka Hideaki Tanaka Yuki Maeda Misako Katabuchi Tomoji Mashimo Shinya Toyokuni Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats Scientific Reports BRCA2 exon 11 Pathogenic variant Heterozygote Spermatogenesis Aging Male subfertility |
| title | Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats |
| title_full | Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats |
| title_fullStr | Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats |
| title_full_unstemmed | Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats |
| title_short | Heterozygous mutation in BRCA2 induces accelerated age-dependent decline in sperm quality with male subfertility in rats |
| title_sort | heterozygous mutation in brca2 induces accelerated age dependent decline in sperm quality with male subfertility in rats |
| topic | BRCA2 exon 11 Pathogenic variant Heterozygote Spermatogenesis Aging Male subfertility |
| url | https://doi.org/10.1038/s41598-024-84184-8 |
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