title: Heterogeneous characteristics of Korean patients with dysferlinopathy.
abstract: Dysferlinopathy is caused by mutations in the DYSF gene. To characterize the clinical spectrum, we investigated the characteristics of 31 Korean dysferlinopathy patients confirmed by immunohistochemistry. The mean age of symptom onset was 22.23 ± 7.34 yr. The serum creatine kinase (CK) was highly increased (4- to 101-fold above normal). The pathological findings of muscle specimens showed nonspecific dystrophic features and frequent inflammatory cell infiltration. Muscle imaging studies showed fatty atrophic changes dominantly in the posterolateral muscles of the lower limb. The patients with dysferlinopathy were classified by initial muscle weakness: fifteen patients with Miyoshi myopathy phenotype (MM), thirteen patients with limb girdle muscular dystrophy 2B phenotype (LGMD2B), two patients with proximodistal phenotype, and one asymptomatic patient. There were no differences between LGMD2B and MM groups in terms of onset age, serum CK levels and pathological findings. Dysferlinopathy patients usually have young adult onset and high serum CK levels. However, heterogeneity of clinical presentations and pathologic findings upon routine staining makes it difficult to diagnose dysferlinopathy. These limitations make immunohistochemistry currently the most important method for the diagnosis of dysferlinopathy.
authors.affiliation: Department of Neurology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyung Jun
authors.initials: HJ
authors.lastname: Park
authors.forename: Ji-Man
authors.initials: JM
authors.lastname: Hong
authors.forename: Gyoung Im
authors.initials: GI
authors.lastname: Suh
authors.forename: Ha Young
authors.initials: HY
authors.lastname: Shin
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Il Nam
authors.initials: IN
authors.lastname: Sunwoo
authors.forename: Bum Chun
authors.initials: BC
authors.lastname: Suh
authors.forename: Young-Chul
authors.initials: YC
authors.lastname: Choi
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D003402:Creatine Kinase / Q000097:blood; D049310:Distal Myopathies / Q000473:pathology; D000073939:Dysferlin; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000235:genetics; D008875:Middle Aged; D009124:Muscle Proteins / Q000235:genetics; D009133:Muscular Atrophy / Q000473:pathology; D049288:Muscular Dystrophies, Limb-Girdle / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D009154:Mutation; D010641:Phenotype; D056910:Republic of Korea; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: C114839:DYSF protein, human; D000073939:Dysferlin; D008565:Membrane Proteins; D009124:Muscle Proteins; D003402:Creatine Kinase