A pathogenic CtBP1 missense mutation causes altered cofactor binding and transcriptional activity.

Autor: Beck, David B., Subramanian, T., Vijayalingam, S., Ezekiel, Uthayashankar R., Donkervoort, Sandra, Yang, Michele L., Dubbs, Holly A., Ortiz-Gonzalez, Xilma R., Lakhani, Shenela, Segal, Devorah, Au, Margaret, Graham, John M., Verma, Sumit, Waggoner, Darrel, Shinawi, Marwan, Bönnemann, Carsten G., Chung, Wendy K., Chinnadurai, G.
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Zdroj: Neurogenetics; Aug2019, Vol. 20 Issue 3, p129-143, 15p
Abstrakt: We previously reported a pathogenic de novo p.R342W mutation in the transcriptional corepressor CTBP1 in four independent patients with neurodevelopmental disabilities [1]. Here, we report the clinical phenotypes of seven additional individuals with the same recurrent de novo CTBP1 mutation. Within this cohort, we identified consistent CtBP1-related phenotypes of intellectual disability, ataxia, hypotonia, and tooth enamel defects present in most patients. The R342W mutation in CtBP1 is located within a region implicated in a high affinity-binding cleft for CtBP-interacting proteins. Unbiased proteomic analysis demonstrated reduced interaction of several chromatin-modifying factors with the CtBP1 W342 mutant. Genome-wide transcriptome analysis in human glioblastoma cell lines expressing -CtBP1 R342 (wt) or W342 mutation revealed changes in the expression profiles of genes controlling multiple cellular processes. Patient-derived dermal fibroblasts were found to be more sensitive to apoptosis during acute glucose deprivation compared to controls. Glucose deprivation strongly activated the BH3-only pro-apoptotic gene NOXA, suggesting a link between enhanced cell death and NOXA expression in patient fibroblasts. Our results suggest that context-dependent relief of transcriptional repression of the CtBP1 mutant W342 allele may contribute to deregulation of apoptosis in target tissues of patients leading to neurodevelopmental phenotypes. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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