title: Leber's hereditary optic neuropathy with the 3434, 9011 mitochondrial DNA point mutation.
abstract: BACKGROUND
  Leber's hereditary optic neuropathy (LHON) contains several well-known mitochondrial DNA (mtDNA) point mutations. We report a case with characteristic clinical manifestations of LHON involving a possible new LHON point mutation.
  
  
  METHODS
  A 34-year-old man was diagnosed with LHON. The patient exhibited (1) sudden onset of bilateral visual loss, (2) normal light reflex, and (3) swelling of the peripapillary nerve fiber layer. After subsequent development of bilateral optic disc pallor, we concluded that the patient had LHON. mtDNA analysis was conducted using non-radioisotopic single-strand conformational polymorphism followed by direct sequencing. There was no change in the patient's visual acuity during the 26-month follow-up period.
  
  
  METHODS
  The mtDNA point mutations were found at T3434C, G3483A, and V9011A. The confirmed mtDNA substitutions included (1) A-G at nucleotide position 3434, (2) G-A at nucleotide position 3483, and (3) C-T at nucleotide position 9011. The amino acid code at the nucleotide positions 3434 and 9011 was phylogenetically highly conserved.
  
  
  CONCLUSIONS
  The 3434 and 9011 mtDNA point mutations are candidates for a new LHON mutation.
authors.affiliation: Inouye Eye Hospital, 4-3 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-0062, Japan. shidara-k@inouye-eye.or.jp
authors.forename: Kyoko
authors.initials: K
authors.lastname: Shidara
authors.forename: Masato
authors.initials: M
authors.lastname: Wakakura
mesh_terms: D000328:Adult; D004272:DNA, Mitochondrial / Q000235:genetics*; D006801:Humans; D008297:Male; D008928:Mitochondria / Q000235:genetics; D009412:Nerve Fibers / Q000473:pathology; D029242:Optic Atrophy, Hereditary, Leber / Q000235:genetics* / Q000503:physiopathology; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012165:Retinal Ganglion Cells / Q000473:pathology; D014786:Vision Disorders / Q000503:physiopathology; D014792:Visual Acuity / Q000502:physiology; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology
chemical_list: D004272:DNA, Mitochondrial