J Korean Med Sci.  2012 Apr;27(4):423-429. 10.3346/jkms.2012.27.4.423.

Heterogeneous Characteristics of Korean Patients with Dysferlinopathy

• Park HJ
• Hong JM
• Suh GI
• Shin HY
• Kim SM
• Sunwoo IN
• Suh BC
• Choi YC

• KMID: 2157904
• DOI: http://doi.org/10.3346/jkms.2012.27.4.423

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.

Keyword

Dysferlin; mmunohistochemistry; Limb-Girdle Muscular Dystrophy Type 2B; Miyoshi Myopathy

MeSH Terms

Adolescent
Adult
Age of Onset
Creatine Kinase/blood
Distal Myopathies/pathology
Female
Humans
Immunohistochemistry
Male
Membrane Proteins/genetics
Middle Aged
Muscle Proteins/genetics
Muscular Atrophy/pathology
Muscular Dystrophies, Limb-Girdle/*diagnosis/genetics/pathology
Mutation
Phenotype
Republic of Korea
Tomography, X-Ray Computed
Young Adult