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.

Two novel mutations in PEO1 (twinkle) gene associated with chronic external ophthalmoplegia / D. Ronchi, E. Fassone, A. Bordoni, M. Sciacco, V. Lucchini, A. Di Fonzo, M. Rizzuti, I. Colombo, L. Napoli, P. Ciscato, M. Moggio, A. Cosi, M. Collotta, S. Corti, N. Bresolin, G.P. Comi. - In: JOURNAL OF THE NEUROLOGICAL SCIENCES. - ISSN 0022-510X. - 308:1/2(2011 Sep 15), pp. 173-176.

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

D. Ronchi
Primo
;
E. Fassone
Secondo
;
A. Bordoni;V. Lucchini;A. Di Fonzo;I. Colombo;A. Cosi;S. Corti;N. Bresolin
Penultimo
;
G.P. Comi
Ultimo
2011-09-15

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.
COX deficiency; Mitochondrial myopathy; mtDNA multiple deletions; PEO1 (C10ORF2); Progressive external ophthalmoplegia
Settore MED/26 - Neurologia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/190761
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