Purpose To delineate the genotype-phenotype correlation in individuals with likely pathogenic variants in the CLTC gene. Methods We describe 13 individuals with de novo CLTC variants. Causality of variants was determined by using the tolerance landscape of CLTC and computer-assisted molecular modeling where applicable. Phenotypic abnormalities observed in the individuals identified with missense and in-frame variants were compared with those with nonsense or frameshift variants in CLTC. Results All de novo variants were judged to be causal. Combining our data with that of 14 previously reported affected individuals (n = 27), all had intellectual disability (ID), ranging from mild to moderate/severe, with or without additional neurologic, behavioral, craniofacial, ophthalmologic, and gastrointestinal features. Microcephaly, hypoplasia of the corpus callosum, and epilepsy were more frequently observed in individuals with missense and in-frame variants than in those with nonsense and frameshift variants. However, this difference was not significant.
De novo CLTC variants are associated with a variable phenotype from mild to severe intellectualdisability, microcephaly, hypoplasia of the corpus callosum, and epilepsy / Nabais Sá MJ, Venselaar H, Wiel L, Trimouille A, Lasseaux E, Naudion S, Lacombe D, Piton A, Vincent-Delorme C, Zweier C, Reis A,Trollmann R, Ruiz A, Gabau E, Vetro A, Guerrini R, Bakhtiari S, Kruer MC, Amor DJ, Cooper MS, Bijlsma EK, Barakat TS, van Dooren MF, van Slegtenhorst M, Pfundt R, Gilissen C, Willemsen MA, de Vries BBA, de Brouwer APM, Koolen DA. - In: GENETICS IN MEDICINE. - ISSN 1098-3600. - ELETTRONICO. - 22:(2020), pp. 797-802. [10.1038/s41436-019-0703-y]
De novo CLTC variants are associated with a variable phenotype from mild to severe intellectualdisability, microcephaly, hypoplasia of the corpus callosum, and epilepsy
Vetro A;Guerrini R;
2020
Abstract
Purpose To delineate the genotype-phenotype correlation in individuals with likely pathogenic variants in the CLTC gene. Methods We describe 13 individuals with de novo CLTC variants. Causality of variants was determined by using the tolerance landscape of CLTC and computer-assisted molecular modeling where applicable. Phenotypic abnormalities observed in the individuals identified with missense and in-frame variants were compared with those with nonsense or frameshift variants in CLTC. Results All de novo variants were judged to be causal. Combining our data with that of 14 previously reported affected individuals (n = 27), all had intellectual disability (ID), ranging from mild to moderate/severe, with or without additional neurologic, behavioral, craniofacial, ophthalmologic, and gastrointestinal features. Microcephaly, hypoplasia of the corpus callosum, and epilepsy were more frequently observed in individuals with missense and in-frame variants than in those with nonsense and frameshift variants. However, this difference was not significant.
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