1 Ocak 2023 Dergi makalesi Açık Erişim

Wong, Samantha; Tan, Yu Xuan; Loh, Abigail Yi Ting; Tan, Kiat Yi; Lee, Hane; Aziz, Zainab; Nelson, Stanley F.; Ozkan, Engin; Kayserili, Hülya; Escande-Beillard, Nathalie; Reversade, Bruno

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    <subfield code="a">RAF1 deficiency causes a lethal syndrome that underscores RTK signaling during embryogenesis</subfield>
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    <subfield code="a">&lt;p&gt;Somatic and germline gain-of-function point mutations in RAF, one of the first oncogenes to be discovered in humans, delineate a group of tumor-prone syndromes known as the RASopathies. In this study, we document the first human phenotype resulting from the germline loss-of-function of the proto-oncogene RAF1 (a.k.a. CRAF). In a consanguineous family, we uncovered a homozygous p.Thr543Met variant segregating with a neonatal lethal syndrome with cutaneous, craniofacial, cardiac, and limb anomalies. Structure-based prediction and functional tests using human knock-in cells showed that threonine 543 is essential to: (i) ensure RAF1's stability and phosphorylation, (ii) maintain its kinase activity toward substrates of the MAPK pathway, and (iii) protect from stress-induced apoptosis mediated by ASK1. In Xenopus embryos, mutant RAF1(T543M) failed to phenocopy the effects of normal and overactive FGF/MAPK signaling, confirming its hypomorphic activity. Collectively, our data disclose the genetic and molecular etiology of a novel lethal syndrome with progeroid features, highlighting the importance of RTK signaling for human development and homeostasis.&lt;/p&gt;</subfield>
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