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• W2097905193 abstract "Artemis is required for V(D)J recombination and the repair of a subset of radiation-induced DNA double strand breaks (DSBs). Artemis-null patients display radiosensitivity (RS) and severe combined immunodeficiency (SCID), classified as RS-SCID. Strongly impacting hypomorphic Artemis mutations confer marked infant immunodeficiency and a predisposition for EBV-associated lymphomas. Here, we provide evidence that a polymorphic Artemis variant (c.512C > G: p.171P > R), which has a world-wide prevalence of 15%, is functionally impacting. The c.512C > G mutation causes an ∼3-fold decrease in Artemis endonuclease activity in vitro. Cells derived from a patient who expressed a single Artemis allele with the polymorphic mutational change, showed radiosensitivity and a DSB repair defect in G2 phase, with Artemis cDNA expression rescuing both phenotypes. The c.512C > G change has an additive impact on Artemis function when combined with a novel C-terminal truncating mutation (p.436C > X), which also partially inactivates Artemis activity. Collectively, our findings provide strong evidence that monoallelic expression of the c.512C > G variant impairs Artemis function causing significant radiosensitivity and a G2 phase DSB repair defect. The patient exhibiting monoallelic c.512C > G-Artemis expression showed immunodeficiency only in adulthood, developed bilateral carcinoma of the nipple and myelodysplasia raising the possibility that modestly decreased Artemis function can impact clinically." @default.
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• W2097905193 date "2010-09-04" @default.
• W2097905193 modified "2023-09-25" @default.
• W2097905193 title "An Artemis polymorphic variant reduces Artemis activity and confers cellular radiosensitivity" @default.
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• W2097905193 doi "https://doi.org/10.1016/j.dnarep.2010.07.001" @default.
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