title: mtDNA nt3243 mutation, external ophthalmoplegia, and hypogonadism in an adolescent girl.
abstract: A 14-year-old girl presented with a 3-month history of easy fatigue and exercise intolerance, especially when climbing stairs. She had a mild ptosis and mild limitation of upward gaze. Her puberty was delayed, and she manifested hypogonadotrophic hypogonadism. Serum lactic and pyruvic acids were elevated. Cranial magnetic resonance imaging was normal. Muscle biopsy documented typical ragged-red fibers. A point mutation at nucleotide 3243 in the tRNALeu(UUR) (typical mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) mutation) was detected in mitochondrial DNA from both blood and muscle tissues, indicating that our patient was suffering from a mitochondrial myopathy. Hypogonadism may be a manifestation of the MELAS nucleotide 3243 mutation.
authors.affiliation: Department of Paediatric Neurology, Hacettepe University Children's Hospital, Ankara, Turkey.
authors.forename: H
authors.initials: H
authors.lastname: Topaloğlu
authors.forename: V
authors.initials: V
authors.lastname: Seyrantepe
authors.forename: N
authors.initials: N
authors.lastname: Kandemir
authors.forename: Z
authors.initials: Z
authors.lastname: Akçören
authors.forename: M
authors.initials: M
authors.lastname: Ozgüç
mesh_terms: D000293:Adolescent; D004272:DNA, Mitochondrial / Q000235:genetics*; D005260:Female; D006801:Humans; D007006:Hypogonadism / Q000188:drug therapy / Q000235:genetics*; D017241:MELAS Syndrome / Q000235:genetics* / Q000503:physiopathology; D017243:MERRF Syndrome / Q000235:genetics / Q000473:pathology; D018482:Muscle, Skeletal / Q000473:pathology; D009886:Ophthalmoplegia / Q000235:genetics; D017354:Point Mutation; D016133:Polymerase Chain Reaction
chemical_list: D004272:DNA, Mitochondrial