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Evaluation of the apo-1/Fas promoter mva I polymorphism in multiple sclerosis
Q R Huang1, S M Teutsch, M M Buhler
1Department of Rheumatology, Neuroimmunology Unit, Westmead Hospital, Westmead, NSW, 2145, Australia.
Abstract:
The pathogenesis of multiple sclerosis is under strong genetic control involving several or more genes each of modest effect. Whilst the mechanisms underlying the pathogenesis of MS remain unknown, it has been hypothesised that either decreased apoptosis of autoreactive T cells in the CNS, or increased apoptosis of oligodendrocytes may play an important role. The Apo-1/Fas antigen (CD95), the gene for which is located in a chromosomal region showing linkage in MS genome screens, is a critical inducer of apoptosis and studies have shown aberrant expression of this molecule in MS, correlating with a decrease in T cell apoptosis or increase in CNS tissue damage. This study investigated an Mva I polymorphism in the Apo-1/Fas promoter region in a group of 124 Australian patients with relapsing-remitting MS and in 183 normal controls. Whilst there were increases in the Mva I*2 allele in MS individuals overall (59% vs 52%, P not corrected=0.08), and in HLA-DRB1*1501 negative MS patients (62% vs 55%), these were not significantly different from controls. Interactions were investigated between the Mva I alleles and T cell receptor beta chain variable region (TCRBV) germline polymorphisms, with a trend in MS individuals towards a decrease of the Mva I*1 allele when combined with the TCRBV3S1*2 allele (Relative Risk=0.25, P=0.067), and with the TCRBV8S1*1 allele (Relative Risk=0.44, P=0.12). Overall, the findings of this study indicate a possible effect of the Apo-1/Fas promoter Mva I polymorphism in MS susceptibility, which needs to be confirmed in further studies. Multiple Sclerosis (2000) 6 14 - 18
Insights
Genetic factors influence multiple sclerosis (MS) pathogenesis. This study explored the Apo-1/Fas promoter Mva I polymorphism
Area of Science:
- Neuroimmunology
- Genetics of autoimmune diseases
- Cellular apoptosis
Background:
- Multiple sclerosis (MS) pathogenesis involves complex genetic factors.
- The Apo-1/Fas antigen (CD95) is a key apoptosis inducer implicated in MS.
- Aberrant Apo-1/Fas expression correlates with T cell apoptosis and CNS damage in MS.
Purpose of the Study:
- To investigate the association of an Mva I polymorphism in the Apo-1/Fas promoter with MS susceptibility.
- To explore potential interactions between Apo-1/Fas and T cell receptor beta chain variable region (TCRBV) polymorphisms in MS.
Main Methods:
- Case-control study involving 124 Australian relapsing-remitting MS patients and 183 healthy controls.
- Genotyping of the Mva I polymorphism in the Apo-1/Fas promoter region.
- Analysis of interactions with known TCRBV germline polymorphisms.
Main Results:
- The Mva I*2 allele showed a non-significant trend towards increased frequency in MS patients.
- No significant differences were observed in allele frequencies between MS patients and controls.
- A trend suggested a decreased Mva I*1 allele frequency when combined with specific TCRBV alleles in MS individuals.
Conclusions:
- The Apo-1/Fas promoter Mva I polymorphism may have a subtle role in MS susceptibility.
- Further research is required to confirm these findings and elucidate the genetic contributions to MS.
- Investigating gene-gene interactions offers insights into complex autoimmune disease mechanisms.