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Function associated transforming growth factor-beta gene polymorphism in chronic beryllium disease.
Karoline I Gaede1, Massimo Amicosante, Manfred Schürmann
1Medical University Hospital Freiburg, Department of Pneumology, Killianstrasse 5, 79106 Freiburg, Germany. kgaede@fz-borstel.de
Journal of Molecular Medicine (Berlin, Germany)
|March 8, 2005
Summary
Genetic factors influence chronic beryllium disease (CBD) susceptibility. Low TGF-beta(1) genotypes are linked to CBD in European/Israeli populations, while TNF-alpha variants are associated in US patients, suggesting diverse genetic contributions to this rare lung disease.
Area of Science:
- Immunogenetics
- Pulmonary Medicine
- Occupational Health
Background:
- Chronic beryllium disease (CBD) is a rare granulomatous lung disease mimicking sarcoidosis.
- Genetic susceptibility, particularly human leukocyte antigen-DP beta chain (HLA-DPB1-Glu69), is implicated in CBD development.
- Other genes regulating immune and inflammatory responses likely contribute to CBD pathogenesis.
Purpose of the Study:
- To investigate the role of functional gene polymorphisms (PMs) in tumor necrosis factor (TNF)A and transforming growth factor (TGF)-beta(1) in CBD.
- To analyze the association of TGF-beta(1) (codon 25) PM with CBD in European/Israeli and United States populations.
- To explore the interaction of gene PMs with HLA class II variants in determining CBD susceptibility.
Main Methods:
- Analysis of TGF-beta(1) (codon 25) PM in 59 CBD patients and 164 healthy controls from European/Israeli and US groups.
- Genotyping of HLA class II variants and TNFA (-308) PM in patients.
- Statistical comparison of genotype frequencies between patient and control groups, and between different ethnic cohorts.
Main Results:
- A significant shift towards low-producing TGF-beta(1) non-GG genotypes was observed in European/Israeli CBD patients (62.50% vs. 13.82% in controls, P<0.001).
- This TGF-beta(1) association was not found in US patients, whose TGF-beta(1) genotype frequencies differed significantly from European/Israeli patients.
- Increased frequencies of the high-producing TNFA2 allele were found in US CBD patients (28.20% vs. 8.96% in controls, P<0.005), but not in European/Israeli patients.
Conclusions:
- Low TGF-beta(1) production, indicated by specific PM genotypes, is associated with CBD pathogenesis, particularly in European/Israeli populations.
- Distinct genetic associations (TGF-beta(1) vs. TNF-alpha) in different ethnic groups suggest varied genetic backgrounds influencing CBD susceptibility.
- The interplay between immune response genes (e.g., HLA-DPB1) and regulatory cytokine genes (TNF-alpha, TGF-beta(1)) likely determines the overall susceptibility to beryllium-induced immune responses and CBD.