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Molecular genetics of systemic sclerosis

J D Reveille1

  • 1Department of Rheumatology and Clinical Immunogenetics, University of Texas Health Science Center at Houston 77225.

Current Opinion in Rheumatology
|November 1, 1993
PubMed
Summary

Genetic factors, especially the major histocompatibility complex, are linked to systemic sclerosis. Ethnic differences may explain variable findings, suggesting HLA class II associations with autoantibody responses are key.

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Area of Science:

  • Immunogenetics
  • Rheumatology
  • Human Genetics

Background:

  • Progressive systemic sclerosis (PSS) shows associations with genetic factors, particularly the major histocompatibility complex (MHC).
  • Previous studies reported inconsistent frequencies of MHC genes, potentially due to the disease's heterogeneity and ethnic variations in autoantibody subsets.
  • Systemic sclerosis is recognized as a clinically and serologically diverse condition.

Purpose of the Study:

  • To investigate the role of genetic factors, specifically the human leukocyte antigen (HLA) complex, in the development of progressive systemic sclerosis.
  • To explore the influence of ethnic variations on the association between genetic factors and autoantibody responses in PSS.
  • To identify specific genetic components, such as HLA class II molecules, contributing to PSS pathogenesis.

Main Methods:

  • Review of recent genetic association studies in progressive systemic sclerosis.
  • Analysis of major histocompatibility complex gene frequencies across different ethnic groups.
  • Examination of HLA class II molecule associations with specific autoantibody responses.

Main Results:

  • Variability in major histocompatibility complex associations may stem from ethnic differences in patient cohorts.
  • Progressive systemic sclerosis appears to be a composite disease driven by HLA class II-associated autoantibody responses.
  • Specific amino acid residues in HLA class II molecules, particularly HLA-DQ beta domains, are implicated in promoting these responses.

Conclusions:

  • Human leukocyte antigen class II associations with autoantibody responses are central to progressive systemic sclerosis.
  • Ethnic diversity is a critical factor to consider in genetic association studies of PSS.
  • Further research is needed to elucidate the role of other genetic factors in systemic sclerosis.

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