TCRBV20S1 and TCRBV3S1 gene segment polymorphisms in systemic sclerosis
Markus Bredemeier1, José Artur Bogo Chies, Andréa Wieck
1Division of Rheumatology, Radiology, and Cardiology of the Hospital de Clínicas de Porto Alegre, RS, Brazil.
The Journal of Rheumatology
|April 17, 2008
Summary
The null allele of TCRBV20S1 is a risk factor for systemic sclerosis (SSc), while TCRBV3S1 allele 1 is linked to interstitial lung disease in SSc patients. This suggests Vbeta20+ and Vbeta3.1+ cells may protect against SSc pathogenesis.
Area of Science:
- Immunogenetics
- Rheumatology
Background:
- T-cell receptor (TCR) gene segments play a role in immune responses.
- Specific TCRBV gene variants, TCRBV20S1 and TCRBV3S1, have been implicated in T-cell populations.
Purpose of the Study:
- To investigate the association between TCRBV20S1 and TCRBV3S1 gene segment variants and systemic sclerosis (SSc).
- To determine if these variants correlate with clinical manifestations of SSc, such as interstitial lung disease.
Main Methods:
- Genotyping of TCRBV20S1 and TCRBV3S1 variants using PCR-RFLP in 130 SSc patients and 118-130 controls.
- Clinical evaluation, serology, pulmonary function tests, CT scans, and echocardiography were performed on patients.
Main Results:
- Significantly higher frequencies of the TCRBV20S1 null allele (allele 2) were observed in SSc patients compared to controls (p < 0.001).
- The TCRBV3S1 gene segment frequencies did not differ between groups, but TCRBV3S1 allele 1 carriers had increased interstitial lung disease prevalence in SSc patients (p = 0.032).
Conclusions:
- The TCRBV20S1 null allele is a potential risk factor for developing SSc.
- TCRBV3S1 allele 1 may be a risk factor for interstitial lung disease in SSc patients, suggesting a protective role for Vbeta20+ and Vbeta3.1+ T-cells.
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