New MT-ND1 pathologic mutation for Leber hereditary optic neuropathy

Martínez-Romero, Íñigo ; Herrero-Martín, M Dolores ; Llobet, Laura (Universidad de Zaragoza) ; Emperador, Sonia ; Martín-Navarro, Antonio ; Narberhaus, Bernat ; Ascaso, Francisco J (Universidad de Zaragoza) ; López-Gallardo, Ester (Universidad de Zaragoza) ; Montoya, Julio (Universidad de Zaragoza) ; Ruiz-Pesini, Eduardo (Universidad de Zaragoza)

Resumen: AbstractMutations causing Leber hereditary optic neuropathy are usually homoplasmic, show incomplete penetrance, and many of the affected positions are not well conserved through evolution. A large percentage of patients harbouring these mutations have no family history of disease. Moreover, the transfer of the mutation in the cybrid model is frequently not accompanied by the transfer of the cellular, biochemical and molecular phenotype. All these features make difficult their classification as the etiologic factors for this disease. We report a patient who exhibits typical clinical features of Leber hereditary optic neuropathy but lacks all three of the most common mitochondrial DNA mutations.MethodsThe diagnosis was made based on clinical studies. The mitochondrial DNA was completely sequenced, and the candidate mutation was analysed in more than 18 000 individuals around the world, its conservation index was estimated in more than 3100 species from protists to mammals, its position was modelled in the crystal structure of a bacteria ortholog subunit, and its functional consequences were studied in a cybrid model.ResultsGenetic analysis revealed an m.3472T>C transition in the MT‐ND1 gene that changes a phenylalanine to leucine at position 56. Bioinformatics, molecular‐genetic analysis and functional studies suggest that this transition is the etiological factor for the disorder.ConclusionsThis mutation expands the spectrum of deleterious changes in mitochondrial DNA‐encoded complex I polypeptides associated with this pathology and highlights the difficulties in assigning pathogenicity to new homoplasmic mutations that show incomplete penetrance in sporadic Leber hereditary optic neuropathy patients.

Idioma: Inglés

DOI: 10.1111/ceo.12355

Año: 2014

Publicado en: CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY 42, 9 (2014), 856-864
ISSN: 1442-6404

Factor impacto JCR: 2.347 (2014)

Categ. JCR: OPHTHALMOLOGY rank: 18 / 57 = 0.316 (2014) - Q2 - T1

Financiación: info:eu-repo/grantAgreement/ES/FIS/FI12/00217
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/FIS/PI10-00662
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/FIS/PI11-01301

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Oftalmología (Dpto. Cirugía,Ginecol.Obstetr.)
Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)