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Confirmation of TACO1 as a Leigh Syndrome Disease Gene in Two Additional Families

Lookup NU author(s): Benjamin Munro, Dr Ana Topf, Professor Hanns Lochmuller, Professor Rita Horvath

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2020 - IOS Press and the authors. All rights reserved. Background: In 2009, we identified TACO1 as a novel mitochondrial disease gene in a single family, however no second family has been described to confirm the role of TACO1 in mitochondrial disease. Objective: In this report, we describe two independent consanguineous families carrying pathogenic variants in TACO1, confirming the phenotype. Methods: Detailed clinical investigations and whole exome sequencing with haplotype analysis have been performed in several members of the two reported families. Results: Clinical phenotype of the patients confirms the originally reported phenotype of a childhood-onset progressive cerebellar and pyramidal syndrome with optic atrophy and learning difficulties. Brain MRI showed periventricular white matter lesions with multiple cystic defects, suggesting leukoencephalopathy in both patients. One patient carried the previously described homozygous TACO1 variant (p.His158ProfsTer8) and haplotype analysis suggested that this variant is a rare founder mutation. The second patient from another family carried a homozygous novel frame shift variant (p.Cys85PhefsTer15). Conclusions: The identification of two Turkish families with similar characteristic clinical presentation and an additional homozygous nonsense mutation confirms that TACO1 is a human mitochondrial disease gene. Although most patients with this clinical presentation undergo next generation sequencing analysis, screening for selected founder mutations in the Turkish population based on the precise clinical presentation may reduce time and cost of finding the genetic diagnosis even in the era of massively parallel sequencing.


Publication metadata

Author(s): Oktay Y, Gungor S, Zeltner L, Wiethoff S, Schols L, Sonmezler E, Yilmaz E, Munro B, Bender B, Kernstock C, Kaemereit S, Liepelt I, Topf A, Yis U, Laurie S, Yaramis A, Zuchner S, Hiz S, Lochmuller H, Schule R, Horvath R

Publication type: Article

Publication status: Published

Journal: Journal of Neuromuscular Diseases

Year: 2020

Volume: 7

Issue: 3

Pages: 301-308

Online publication date: 02/06/2020

Acceptance date: 02/04/2018

Date deposited: 26/07/2021

ISSN (print): 2214-3599

ISSN (electronic): 2214-3602

Publisher: IOS Press

URL: https://doi.org/10.3233/JND-200510

DOI: 10.3233/JND-200510

PubMed id: 32444556


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