title: Fifteen novel mutations in the mitochondrial NADH dehydrogenase subunit 1, 2, 3, 4, 4L, 5 and 6 genes from Iranian patients with Leber's hereditary optic neuropathy (LHON).
abstract: Leber's hereditary optic neuropathy (LHON) is an optic nerve dysfunction resulting from mutations in mitochondrial DNA (mtDNA), which is transmitted in a maternal pattern of inheritance. It is caused by three primary point mutations: G11778A, G3460A and T14484C; in the mitochondrial genome. These mutations are sufficient to induce the disease, accounting for the majority of LHON cases, and affect genes that encode for the different subunits of mitochondrial complexes I and III of the mitochondrial respiratory chain. Other mutations are secondary mutations associated with the primary mutations. The purpose of this study was to determine MT-ND variations in Iranian patients with LHON. In order to determine the prevalence and distribution of mitochondrial mutations in the LHON patients, their DNA was studied using PCR and DNA sequencing analysis. Sequencing of MT-ND genes from 35 LHON patients revealed a total of 44 nucleotide variations, in which fifteen novel variations-A14020G, A13663G, C10399T, C4932A, C3893G, C10557A, C12012A, C13934T, G4596A, T12851A, T4539A, T4941A, T13255A, T14353C and del A 4513-were observed in 27 LHON patients. However, eight patients showed no variation in the ND genes. These mutations contribute to the current database of mtDNA polymorphisms in LHON patients and may facilitate the definition of disease-related mutations in human mtDNA. This research may help to understand the disease mechanism and open up new diagnostic opportunities for LHON.
authors.affiliation: Department of Biotechnology, Faculty of Chemistry, University of Kashan, Kashan, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Rezvani
authors.forename: Elmira
authors.initials: E
authors.lastname: Didari
authors.forename: Ahoura
authors.initials: A
authors.lastname: Arastehkani
authors.forename: Vadieh
authors.initials: V
authors.lastname: Ghodsinejad
authors.forename: Omid
authors.initials: O
authors.lastname: Aryani
authors.forename: Behnam
authors.initials: B
authors.lastname: Kamalidehghan
authors.forename: Massoud
authors.initials: M
authors.lastname: Houshmand
mesh_terms: D020022:Genetic Predisposition to Disease; D006801:Humans; D007492:Iran; D008297:Male; D008928:Mitochondria / Q000201:enzymology*; D009154:Mutation / Q000235:genetics*; D009245:NADH Dehydrogenase / Q000235:genetics*; D029242:Optic Atrophy, Hereditary, Leber / Q000201:enzymology* / Q000235:genetics*; D016133:Polymerase Chain Reaction; D021122:Protein Subunits / Q000235:genetics*; D055815:Young Adult
chemical_list: D021122:Protein Subunits; D009245:NADH Dehydrogenase