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MHC2TA rs4774C and HHV-6A active replication in multiple sclerosis patients
R Alvarez-Lafuente1, A Martinez, M Garcia-Montojo
1Servicio de Neurología, Hospital Clínico San Carlos, Madrid, Spain. ralvarezlafuente@yahoo.es
European Journal of Neurology
|August 8, 2009
Summary
This study confirms a strong gene-environment interaction between human herpesvirus 6A (HHV-6A) replication and the MHC2TA rs4774C gene variant. Patients with both factors showed poorer disease progression and treatment response in multiple sclerosis (MS).
Area of Science:
- Genetics and Immunology
- Neuroscience
- Infectious Diseases
Background:
- Previous research identified a significant gene-environment interaction between human herpesvirus 6A (HHV-6A) active replication and the MHC2TA rs4774C polymorphism.
- The role of viral infections and genetic factors in the pathogenesis of multiple sclerosis (MS) is an area of ongoing investigation.
Purpose of the Study:
- To re-evaluate the previously reported association between HHV-6A active replication and the MHC2TA rs4774C variant.
- To investigate whether MS patients with the MHC2TA rs4774C minor allele and active HHV-6A infection exhibit distinct clinical characteristics.
- To explore a potential association between the MHC2TA rs4774C polymorphism and Epstein-Barr virus (EBV) infection.
Main Methods:
- Analysis of 149 MS patients for the MHC2TA rs4774 G/C polymorphism using TaqMan Assay-on-Demand.
- Quantification of HHV-6A genomes in serum via quantitative PCR.
- Collection of comprehensive clinical data, including disease progression (EDSS) and response to interferon beta treatment.
- Comparison with a control group of 562 healthy Spanish individuals for genetic analysis.
Main Results:
- The strong association between the MHC2TA rs4774C allele and active HHV-6A replication was confirmed (P = 0.0001).
- MS patients with both HHV-6A active infection and the rs4774C allele showed a significant tendency towards not being progression-free at 2 years post-diagnosis (P = 0.01).
- This subgroup of patients demonstrated a lower response rate to interferon beta treatment, with only one-third responding positively (P = 0.05).
Conclusions:
- The study validates the significant gene-environment interaction between HHV-6A active replication and the MHC2TA rs4774C polymorphism.
- A distinct clinical behavior, characterized by increased disease progression and reduced treatment efficacy, was observed in MS patients with concurrent HHV-6A infection and the MHC2TA rs4774C allele.
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