Missense variants in TAF1 and developmental phenotypes: challenges of determining pathogenicity.
Fiche publication
Date publication
octobre 2019
Journal
Human mutation
Auteurs
Membres identifiés du Cancéropôle Est :
Pr FAIVRE Laurence
Tous les auteurs :
Cheng H, Capponi S, Wakeling E, Marchi E, Li Q, Zhao M, Weng C, Stefan PG, Ahlfors H, Kleyner R, Rope A, Lumaka A, Lukusa P, Devriendt K, Vermeesch J, Posey JE, Palmer EE, Murray L, Leon E, Diaz J, Worgan L, Mallawaarachchi A, Vogt J, de Munnik SA, Dreyer L, Baynam G, Ewans L, Stark Z, Lunke S, Gonçalves AR, Soares G, Oliveira J, Fassi E, Willing M, Waugh JL, Faivre L, Riviere JB, Moutton S, Mohammed S, Payne K, Walsh L, Begtrup A, Guillen Sacoto MJ, Douglas G, Alexander N, Buckley MF, Mark PR, Adès LC, Sandaradura SA, Lupski JR, Roscioli T, Agrawal PB, Kline AD, , Wang K, Timmers HTM, Lyon GJ
Lien Pubmed
Résumé
We recently described a new neurodevelopmental syndrome (TAF1/MRXS33 intellectual disability syndrome) (MIM# 300966) caused by pathogenic variants involving the X-linked gene TAF1, which participates in RNA polymerase II transcription. The initial study reported eleven families, and the syndrome was defined as presenting early in life with hypotonia, facial dysmorphia, and developmental delay that evolved into intellectual disability (ID) and/or autism spectrum disorder (ASD). We have now identified an additional 27 families through a genotype-first approach. Familial segregation analysis, clinical phenotyping, and bioinformatics were capitalized on to assess potential variant pathogenicity, and molecular modelling was performed for those variants falling within structurally characterized domains of TAF1. A novel phenotypic clustering approach was also applied, in which the phenotypes of affected individuals were classified using 51 standardized Human Phenotype Ontology (HPO) terms. Phenotypes associated with TAF1 variants show considerable pleiotropy and clinical variability, but prominent among previously unreported effects were brain morphological abnormalities, seizures, hearing loss, and heart malformations. Our allelic series broadens the phenotypic spectrum of TAF1/MRXS33 intellectual disability syndrome and the range of TAF1 molecular defects in humans. It also illustrates the challenges for determining the pathogenicity of inherited missense variants, particularly for genes mapping to chromosome X. This article is protected by copyright. All rights reserved.
Mots clés
Cornelia de Lange, MRXS33 intellectual disability syndrome, TAF1, exome sequencing, transcriptomopathy
Référence
Hum. Mutat.. 2019 Oct 23;: