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A Fanci knockout mouse model reveals common and distinct functions for FANCI and FANCD2
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Edité par CCSD ; Oxford University Press -
Emilie L Dubois : CHU de Québec Research Center, HDQ Pavilion, Oncology Division, 9 McMahon, Québec City, QC G1R 3S3, Canada - Department of Molecular Biology, Medical Biochemistry and Pathology; Laval University Cancer Research Center, Québec City, QC G1V 0A6, Canada.. International audience. Fanconi Anemia (FA) clinical phenotypes are het-erogenous and rely on a mutation in one of the 22 FANC genes (FANCA-W) involved in a common inter-strand DNA crosslink-repair pathway. A critical step in the activation of FA pathway is the monoubiquiti-nation of FANCD2 and its binding partner FANCI. To better address the clinical phenotype associated with FANCI and the epistatic relationship with FANCD2, we created the first conditional inactivation model for FANCI in mouse. Fanci −/− mice displayed typical FA features such as delayed development in utero, microphtalmia, cellular sensitivity to mitomycin C, occasional limb abnormalities and hematological deficiencies. Interestingly, the deletion of Fanci leads to a strong meiotic phenotype and severe hypogo-nadism. FANCI was localized in spermatocytes and spermatids and in the nucleus of oocytes. Both FANCI and FANCD2 proteins co-localized with RPA along meiotic chromosomes, albeit at different levels. Consistent with a role in meiotic recombina-tion, FANCI interacted with RAD51 and stimulated D-loop formation, unlike FANCD2. The double knockout Fanci −/− Fancd2 −/− also showed epistatic relationship for hematological defects while being not epistatic with respect to generating viable mice in crosses of double heterozygotes. Collectively, this study highlights common and distinct functions of FANCI and FANCD2 during mouse development, mei-otic recombination and hematopoiesis.
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