title: Mutational analysis in patients with neuromuscular disorders: Detection of mitochondrial deletion and double mutations in the MT-ATP6 gene.
abstract: Mitochondrial diseases encompass a wide variety of pathologies characterized by a dysfunction of the mitochondrial respiratory chain resulting in an energy deficiency. The respiratory chain consists of five multi-protein complexes providing coupling between nutrient oxidation and phosphorylation of ADP to ATP. In the present report, we studied mitochondrial genes of complex I, III, IV and V in 2 Tunisian patients with mitochondrial neuromuscular disorders. In the first patient, we detected the m.8392C>T variation (P136S) in the mitochondrial ATPase6 gene and the m.8527A>G transition at the junction MT-ATP6/MT-ATP8 which change the initiation codon AUG to GUG. The presence of these two variations in such an important gene could probably affect the ATP synthesis in the studied patient. In the second patient, we detected several known variations in addition to a mitochondrial deletion in the major arc of the mtDNA eliminating tRNA and respiratory chain protein genes. This deletion could be responsible of an inefficient translation leading to an inefficient mitochondrial protein synthesis in P2.
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Rahma
authors.initials: R
authors.lastname: Felhi
authors.affiliation: Département des Sciences de la Vie, Faculté des Sciences de Sfax, Université de Sfax, Tunisia. Electronic address: emna_mkaouar@mail2world.com.
authors.forename: Emna
authors.initials: E
authors.lastname: Mkaouar-Rebai
authors.affiliation: Service de pédiatrie, C.H.U. Hedi Chaker de Sfax, Tunisia.
authors.forename: Lamia
authors.initials: L
authors.lastname: Sfaihi-Ben Mansour
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Olfa
authors.initials: O
authors.lastname: Alila-Fersi
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Mouna
authors.initials: M
authors.lastname: Tabebi
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Bochra
authors.initials: B
authors.lastname: Ben Rhouma
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Marwa
authors.initials: M
authors.lastname: Ammar
authors.affiliation: Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Tunisia.
authors.forename: Leila
authors.initials: L
authors.lastname: Keskes
authors.affiliation: Service de pédiatrie, C.H.U. Hedi Chaker de Sfax, Tunisia.
authors.forename: Mongia
authors.initials: M
authors.lastname: Hachicha
authors.affiliation: Département des Sciences de la Vie, Faculté des Sciences de Sfax, Université de Sfax, Tunisia.
authors.forename: Faiza
authors.initials: F
authors.lastname: Fakhfakh
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002648:Child; D003062:Codon; D004252:DNA Mutational Analysis; D017353:Gene Deletion; D014644:Genetic Variation; D006801:Humans; D008297:Male; D008928:Mitochondria / Q000378:metabolism*; D028361:Mitochondrial Diseases / Q000235:genetics*; D025261:Mitochondrial Proton-Translocating ATPases / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D009468:Neuromuscular Diseases / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012343:RNA, Transfer / Q000737:chemistry; D017384:Sequence Deletion; D017386:Sequence Homology, Amino Acid
chemical_list: D003062:Codon; C501005:MT-ATP6 protein, human; D012343:RNA, Transfer; D025261:Mitochondrial Proton-Translocating ATPases
keywords: ATP6 synthase gene; Mitochondrial deletion; Mitochondrial mutations; Neuromuscular disorders; mtDNA