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Distinct developmental outcomes in DNA repair-deficient FANCC c.67delG mutant and FANCC−/− Mice

Abstract

Fanconi Anemia (FA) is an autosomal recessive disorder characterized by diverse clinical manifestations such as aplastic anemia, cancer predisposition, and developmental defects including hypogonadism, microcephaly, organ dysfunction, infertility, hyperpigmentation, microphthalmia, and skeletal defects. In addition to the well-described defects in DNA repair, mitochondrial dysfunction due to defects in mitochondrial autophagy (mitophagy) is also associated with FA, although its contribution to FA phenotypes is unknown. This study focused on the FANCC gene, which, alongside other FA genes, is integral to DNA repair and mitochondrial quality control. In the present study, we created a FANCC mutant mouse model, based on a human mutation (FANCC c.67delG) that is defective in DNA repair but proficient in mitophagy. We found that the FANCC c.67delG mutant mouse model recapitulates some phenotypes observed in FA patients, such as cellular hypersensitivity to DNA cross-linking agents and hematopoietic defects. In contrast, FA phenotypes such as microphthalmia, hypogonadism, and infertility, present in FANCC-deficient mice, were absent in the FANCC c.67delG mice, suggesting that the N-terminal 55 amino acids of FANCC are dispensable for these developmental processes. Furthermore, the FANCC c.67delG mutation preserved mitophagy, and unlike the FANCC null mutation, did not lead to the accumulation of damaged mitochondria in cells or tissues. This study highlights the multifaceted nature of the FANCC protein, with distinct domains responsible for DNA repair and mitophagy. Our results suggest that developmental defects in FA may not solely stem from DNA repair deficiencies but could also involve other functions, such as mitochondrial quality control.

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Fig. 1: Cellular sensitivity to DNA damage in cells from FANCC c.67delG homozygous mutant mice is similar to that of FANCC-deficient animals.
Fig. 2: FANCC c.67delG mutant mice maintain normal ocular and reproductive health despite sharing hematopoietic abnormalities with FANCC null mice.
Fig. 3: FANCC null but not FANCC c.67delG cells display defective mitophagy.

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Acknowledgements

We would like to thank the Transgenic and Gene Knockout Shared Resource at St. Jude Children’s Research Hospital, Memphis, TN, for technical assistance.

Funding

This work was supported by NCI R35 231620 (D.R.G.) and the John H Sununu named Fellowship (S.B).

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Contributions

S.B. contributed to conceptualization, performed experiments and data analysis, writing, review, and editing of the manuscript. C.G. performed experiments and analysis of imaging results, S.S. performed experiments, M.Y provided intellectual input, R.S. contributed to conceptualization, project administration, resource provision, and supervision. H.S analyzed results including pathology evaluations and provided technical support, S.P contributed to the methodology for the mutant mice generation, M.W provided Intellectual input and reviewed the manuscript, D.R.G contributed to conceptualization, funding, project administration, resources, supervision, writing, review, and editing of the manuscript.

Corresponding author

Correspondence to Douglas R. Green.

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Competing interests

During the course of this research, D.R.G. consulted for or received support from Amgen, Ventus, ASHA, Boehringer Ingelheim, Mirumus, and Sonata. The authors declare no conflicts of interest.

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All Mouse studies were conducted in accordance with protocols approved by the St. Jude Children’s Research Hospital Committee on Care and Use of Animals and in compliance with all relevant ethical guidelines.

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Beesetti, S., Guy, C., Sirasanagandla, S. et al. Distinct developmental outcomes in DNA repair-deficient FANCC c.67delG mutant and FANCC−/− Mice. Cell Death Differ 32, 1294–1302 (2025). https://doi.org/10.1038/s41418-025-01461-3

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