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• W2990736599 abstract "In mammalian cells, the catabolic activity of the dNTP triphosphohydrolase SAMHD1 sets the balance and concentration of the four dNTPs. Deficiency of SAMHD1 leads to unequally increased pools and marked dNTP imbalance. Imbalanced dNTP pools increase mutation frequency in cancer cells, but it is not known if the SAMHD1-induced dNTP imbalance favors accumulation of somatic mutations in non-transformed cells. Here, we have investigated how fibroblasts from Aicardi-Goutières Syndrome (AGS) patients with mutated SAMHD1 react to the constitutive pool imbalance characterized by a huge dGTP pool. We focused on the effects on dNTP pools, cell cycle progression, dynamics and fidelity of DNA replication, and efficiency of UV-induced DNA repair. AGS fibroblasts entered senescence prematurely or upregulated genes involved in G1/S transition and DNA replication. The normally growing AGS cells exhibited unchanged DNA replication dynamics and, when quiescent, faster rate of excision repair of UV-induced DNA damages. To investigate whether the lack of SAMHD1 affects DNA replication fidelity, we compared de novo mutations in AGS and WT cells by exome next-generation sequencing. Somatic variant analysis indicated a mutator phenotype suggesting that SAMHD1 is a caretaker gene whose deficiency is per se mutagenic, promoting genome instability in non-transformed cells." @default.
• W2990736599 created "2019-12-05" @default.
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• W2990736599 date "2019-11-26" @default.
• W2990736599 modified "2023-10-10" @default.
• W2990736599 title "SAMHD1‐deficient fibroblasts from Aicardi‐Goutières Syndrome patients can escape senescence and accumulate mutations" @default.
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• W2990736599 doi "https://doi.org/10.1096/fj.201902508r" @default.
• W2990736599 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31914608" @default.
• W2990736599 hasPublicationYear "2019" @default.
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