Mutation in Causes Hypomyelinating Leukodystrophy and Abnormal Ribosomal RNA Regulation

Overview

Journal Neurol Genet

Date 2018 Dec 26

PMID 30584594

Citations 43

Authors

Imen Dorboz

Helene Dumay-Odelot

Karima Boussaid

Yosra Bouyacoub

Pauline Barreau

Simon Samaan

Haifa Jmel

Eleonore Eymard-Pierre

Claude Cances

Celine Bar

Anne-Lise Poulat

Christophe Rousselle

Florence Renaldo

Monique Elmaleh-Berges

Martin Teichmann

Odile Boespflug-Tanguy

Affiliations

Soon will be listed here.

Abstract

Objective: To identify the genetic cause of hypomyelinating leukodystrophy in 2 consanguineous families.

Methods: Homozygosity mapping combined with whole-exome sequencing of consanguineous families was performed. Mutation consequences were determined by studying the structural change of the protein and by the RNA analysis of patients' fibroblasts.

Results: We identified a biallelic mutation in a gene coding for a Pol III-specific subunit, (c.121C>T/p.Arg41Trp), that cosegregates with the disease in 2 unrelated patients. Patients expressed neurologic and extraneurologic signs found in - and -related leukodystrophies with a peculiar severe digestive dysfunction. The mutation impaired the POLR3K-POLR3B interactions resulting in zebrafish in abnormal gut development. Functional studies in the 2 patients' fibroblasts revealed a severe decrease (60%-80%) in the expression of 5S and 7S ribosomal RNAs in comparison with control.

Conclusions: These analyses underlined the key role of ribosomal RNA regulation in the development and maintenance of the white matter and the cerebellum as already reported for diseases related to genes involved in transfer RNA or translation initiation factors.

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