title: Rolandic mitochondrial encephalomyelopathy and MT-ND3 mutations.
abstract: Mitochondrial encephalopathies may be caused by mutations in the respiratory chain complex I subunit genes. Described here are the cases of two pediatric patients who presented with MELAS-like calcarine lesions in addition to novel, bilateral rolandic lesions and epilepsia partialis continua, secondary to MT-ND3 mutations. Data were collected included neurologic symptoms, serial brain imaging, metabolic evaluations, skeletal muscle biopsies, mitochondrial biochemical and molecular testing. Permission for publication was given by the families. Muscle histology revealed nonspecific changes, with no ragged red or blue or COX-negative fibers. Sequencing of the mitochondrial DNA indicated patient 2 to be homoplasmic in muscle for the mt.10158T>C mutation in the ND3 subunit and Patient 1 to be 75% heteroplasmic for the mt.10191T>C mutation, also in ND3. Bilateral rolandic lesions and epilepsia partialis continua accompanied by suspicion of mitochondrial disease are indications to search for an underlying mutation in the MT-ND3 gene.
authors.affiliation: Division of Neurology and Pediatric Emergency Medicine, Hospital for Sick Children, Toronto, Ontario, Canada.
authors.forename: Klaus G E
authors.initials: KG
authors.lastname: Werner
authors.forename: Chantal F
authors.initials: CF
authors.lastname: Morel
authors.forename: Adam
authors.initials: A
authors.lastname: Kirton
authors.forename: Susanne M
authors.initials: SM
authors.lastname: Benseler
authors.forename: John M
authors.initials: JM
authors.lastname: Shoffner
authors.forename: Jane B L
authors.initials: JB
authors.lastname: Addis
authors.forename: Brian H
authors.initials: BH
authors.lastname: Robinson
authors.forename: Delilah M
authors.initials: DM
authors.lastname: Burrowes
authors.forename: Susan I
authors.initials: SI
authors.lastname: Blaser
authors.forename: Leon G
authors.initials: LG
authors.lastname: Epstein
authors.forename: Annette S J
authors.initials: AS
authors.lastname: Feigenbaum
mesh_terms: D000293:Adolescent; D001921:Brain / Q000378:metabolism / Q000473:pathology; D002574:Cervical Vertebrae; D002648:Child; D045303:Cytochromes b / Q000235:genetics; D004252:DNA Mutational Analysis; D004272:DNA, Mitochondrial; D003937:Diagnosis, Differential; D042967:Electron Transport Complex I / Q000235:genetics*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D008931:Mitochondria, Muscle / Q000235:genetics; D017237:Mitochondrial Encephalomyopathies / Q000175:diagnosis* / Q000235:genetics* / Q000473:pathology; D018482:Muscle, Skeletal / Q000473:pathology; D009154:Mutation; D012335:RNA, Ribosomal / Q000235:genetics; D013116:Spinal Cord / Q000473:pathology
chemical_list: D004272:DNA, Mitochondrial; D012335:RNA, Ribosomal; C075526:RNA, ribosomal, 12S; D045303:Cytochromes b; D042967:Electron Transport Complex I; C114961:MT-ND3 protein, human