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Familial dermatomyositis.

S Plamondon1, P B Dent, A M Reed

  • 1Department of Medicine, Children's Hospital, Hamilton Health Sciences Corporation, MacMaster University, Ontario, Canada.

The Journal of Rheumatology
|December 22, 1999
PubMed
Summary
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Familial occurrence of juvenile dermatomyositis (JDMS) was documented in two sisters. Both shared the HLA-DQA1*0501 allele, suggesting a genetic link to JDMS susceptibility.

Area of Science:

  • Immunogenetics
  • Rheumatology
  • Pediatric Autoimmunity

Background:

  • Connective tissue diseases, including juvenile dermatomyositis (JDMS), have variable links to human leukocyte antigen (HLA) genes.
  • The exact role of these genes in JDMS pathogenesis remains unclear.
  • Familial occurrence and twin studies in JDMS are rare, limiting understanding of genetic contributions.

Observation:

  • This study describes two sisters diagnosed with different forms of dermatomyositis: classical JDMS and amyopathic dermatomyositis.
  • Both affected sisters were found to share a specific HLA allele.

Findings:

  • The shared allele between the sisters was HLA-DQA1*0501.
  • This specific HLA allele is previously associated with increased susceptibility to JDMS.

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  • The findings support a potential genetic predisposition to JDMS within families.

    • Implications:

    • Documenting familial JDMS cases strengthens the evidence for a genetic component in the disease.
    • Identifying shared HLA alleles like HLA-DQA1*0501 may aid in understanding JDMS susceptibility.
    • Further research into HLA associations could inform diagnostic and prognostic strategies for JDMS.