Toggle Main Menu Toggle Search

Open Access padlockePrints

Adult-onset Mendelian PEO Associated with Mitochondrial Disease

Lookup NU author(s): Dr Ewen Sommerville, Professor Patrick Chinnery, Dr Grainne Gorman, Professor Robert Taylor

Downloads


Licence

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


Abstract

© 2014 – IOS Press and the authors. All rights reservedBackground: Progressive external ophthalmoplegia (PEO) is an eye movement disorder characterised by paresis of the extra ocular muscles and muscle restricted multiple mitochondrial DNA (mtDNA) deletions. Classification of patients is particularly difficult due to overlapping phenotypes and a poor genotype-phenotype relationship. Despite the identification of several nuclear encoded genes causing PEO, over half of patients with clinically confirmed PEO do not have a genetic diagnosis. Objective: To systematically review genotypic and phenotypic correlates of published cases of adult-onset PEO. Methods: Patients were identified from interrogation of articles from Scopus, Medline via PubMed, and Genetic Abstracts databases using electronic searches (1st January 1970 to 8th November 2013). Reference lists and UniProt entries were also manually checked for additional articles. Results: Twelve nuclear encoded genes were identified (TYMP, SLC25A4, POLG, C10ORF2, OPA1, POLG2, RRM2B, TK2, DGUOK, MPV17, MGME1, and DNA2) systematically from 583 patients. At the time of writing, mutations in SPG7 and AFG3L2 genes were reported to be associated with ophthalmoparesis and multiple mtDNA deletions in fourteen additional adult-onset PEO patients, bringing the total number of known genes to fourteen. Conclusions: Diagnostic yield is still critically dependent on the meticulous clinical and biochemical characterisation of patients. Understanding the intimate relationship between genotype and phenotype remains a fundamental challenge. The results of this systematic review provide guidance to both patients and clinician about future prognosis, and will serve, in future, to assess methods of disease prevention and evaluation of targeted therapeutic strategies.


Publication metadata

Author(s): Sommerville EW, Chinnery PF, Gorman GS, Taylor RW

Publication type: Review

Publication status: Published

Journal: Journal of Neuromuscular Diseases

Year: 2014

Volume: 1

Issue: 2

Pages: 119-133

Online publication date: 01/01/2014

Acceptance date: 01/01/1900

ISSN (print): 2214-3599

ISSN (electronic): 2214-3602

Publisher: IOS Press

URL: https://doi.org/10.3233/JND-140041

DOI: 10.3233/JND-140041


Actions

Find at Newcastle University icon    Link to this publication


Share