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A missense mutation in SNRPE linked to non-syndromal microcephaly interferes with U snRNP assembly and pre-mRNA splicing

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Item Type:Article
Title:A missense mutation in SNRPE linked to non-syndromal microcephaly interferes with U snRNP assembly and pre-mRNA splicing
Creators Name:Chen, T. and Zhang, B. and Ziegenhals, T. and Prusty, A.B. and Fröhler, S. and Grimm, C. and Hu, Y. and Schaefke, B. and Fang, L. and Zhang, M. and Kraemer, N. and Kaindl, A.M. and Fischer, U. and Chen, W.
Abstract:Malfunction of pre-mRNA processing factors are linked to several human diseases including cancer and neurodegeneration. Here we report the identification of a de novo heterozygous missense mutation in the SNRPE gene (c.65T>C (p.Phe22Ser)) in a patient with non-syndromal primary (congenital) microcephaly and intellectual disability. SNRPE encodes SmE, a basal component of pre-mRNA processing U snRNPs. We show that the microcephaly-linked SmE variant is unable to interact with the SMN complex and as a consequence fails to assemble into U snRNPs. This results in widespread mRNA splicing alterations in fibroblast cells derived from this patient. Similar alterations were observed in HEK293 cells upon SmE depletion that could be rescued by the expression of wild type but not mutant SmE. Importantly, the depletion of SmE in zebrafish causes aberrant mRNA splicing alterations and reduced brain size, reminiscent of the patient microcephaly phenotype. We identify the EMX2 mRNA, which encodes a protein required for proper brain development, as a major mis-spliced down stream target. Together, our study links defects in the SNRPE gene to microcephaly and suggests that alterations of cellular splicing of specific mRNAs such as EMX2 results in the neurological phenotype of the disease.
Keywords:Animal Disease Models, Alternative Splicing, Cell Line, HEK293 Cells, Homeodomain Proteins, Intellectual Disability, Messenger RNA, Microcephaly, Missense Mutation, Pedigree, RNA Splicing, Small Nuclear Ribonucleoproteins, snRNP Core Proteins, Transcription Factors, Whole Exome Sequencing, Animals, Zebrafish
Source:PLoS Genetics
Publisher:Public Library of Science
Page Range:e1008460
Date:31 October 2019
Official Publication:https://doi.org/10.1371/journal.pgen.1008460
PubMed:View item in PubMed

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