RFLP analysis in the TNF-beta gene and the susceptibility to alloreactive NK cells in Behçet's disease
N Mizuki1, H Inoko, K Sugimura
1Department of Ophthalmology, Yokohama City University School of Medicine, Japan.
Investigative Ophthalmology & Visual Science
|October 1, 1992
Summary
Genetic factors beyond HLA-B51 may influence Behçet's disease. A specific TNF-beta gene variant was less common in patients, particularly those with eye issues, suggesting a role in disease susceptibility.
Area of Science:
- Immunogenetics
- Molecular Biology
- Rheumatology
Background:
- Behçet's disease (BD) is a multisystem inflammatory disorder.
- Association with Human Leukocyte Antigen (HLA)-B51 is well-established.
- The role of other genes near HLA-B in BD susceptibility requires investigation.
Purpose of the Study:
- To investigate the association of tumor necrosis factor (TNF)-beta gene polymorphisms and natural killer (NK) cell activity with Behçet's disease.
- To explore non-HLA genetic factors contributing to BD susceptibility.
Main Methods:
- Restriction Fragment Length Polymorphism (RFLP) analysis of TNF-beta gene (NcoI and EcoRI).
- Assessment of susceptibility to lysis by alloreactive NK cells.
- Comparison between Behçet's disease patients and healthy controls.
Main Results:
- A significantly decreased frequency of the NcoI 5.5 kb homozygote in the TNF-beta gene was observed in Behçet's disease patients, especially those with ocular lesions.
- No significant differences were found in EcoRI RFLP distribution or NK cell lysis susceptibility.
- These findings suggest a specific TNF-beta gene variant's association with BD.
Conclusions:
- A non-HLA gene in the TNF gene region, centromeric to HLA-B, is a candidate for controlling genetic susceptibility to Behçet's disease.
- The NcoI 5.5 kb homozygote of TNF-beta may confer a protective effect or be linked to protective alleles.
- Further research is needed to elucidate the precise genetic mechanisms in Behçet's disease pathogenesis.
