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Elsevier, Journal of the Neurological Sciences, 1-2(308), p. 173-176, 2011

DOI: 10.1016/j.jns.2011.05.042

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Two novel mutations in PEO1 (twinkle) gene associated with chronic external ophthalmoplegia.

Journal article published in 2011 by Dario Ronchi, Elisa Fassone, Andreina Bordoni, Monica Sciacco, Valeria Lucchini, Alessio Di Fonzo ORCID, Mafalda Rizzuti, Irene Colombo, Laura Napoli, Patrizia Ciscato, Maurizio Moggio, Alessandra Cosi, Martina Collotta, Stefania Corti ORCID, Nereo Bresolin and other authors.
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This paper is available in a repository.

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Abstract

Maintenance and replication of mitochondrial DNA require the concerted action of several factors encoded by nuclear genome. The mitochondrial helicase Twinkle is a key player of replisome machinery. Heterozygous mutations in its coding gene, PEO1, are associated with progressive external ophthalmoplegia (PEO) characterised by ptosis and ophthalmoparesis, with cytochrome c oxidase (COX)-deficient fibres, ragged-red fibres (RRF) and multiple mtDNA deletions in muscle. Here we describe clinical, histological and molecular features of two patients presenting with mitochondrial myopathy associated with PEO. PEO1 sequencing disclosed two novel mutations in exons 1 and 4 of the gene, respectively. Although mutations in PEO1 exon 1 have already been described, this is the first report of mutation occurring in exon 4.