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Functional MxA promoter polymorphism associated with subacute sclerosing panencephalitis
1Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. htorys@pediatr.med.kyushu-u.ac.jp
Neurology
|February 12, 2004
Summary
Genetic variations in the MxA gene promoter may increase susceptibility to subacute sclerosing panencephalitis (SSPE). Japanese individuals with a specific MxA gene variant showed higher MxA protein production, potentially promoting persistent measles virus infection.
Area of Science:
- Virology
- Immunogenetics
- Neuroscience
Background:
- The MxA protein, induced by interferon (IFN), inhibits single-stranded RNA virus replication, including measles virus (MV).
- Subacute sclerosing panencephalitis (SSPE) is a severe neurological complication of measles virus infection.
Purpose of the Study:
- To investigate the association between MxA gene single-nucleotide polymorphisms (SNPs) and the development of SSPE in Japanese individuals.
- To determine if MxA promoter variants influence MxA gene expression and host susceptibility to SSPE.
Main Methods:
- Screening of MxA gene promoter SNPs.
- Association studies between two MxA SNPs and SSPE in Japanese patients.
- Dual luciferase reporter assay to assess MxA promoter activity.
Main Results:
- Four MxA promoter SNPs were identified: -88 G/T, -123 C/A, -200 T/C, and -213 G/T.
- SSPE patients showed a higher frequency of the -88T allele and -88TT genotype compared to controls.
- The MxA promoter with the -88T variant exhibited significantly higher IFN-induced activity than the -88G variant.
Conclusions:
- The MxA promoter -88 G/T SNP may confer genetic susceptibility to SSPE in Japanese individuals.
- Homozygotes for the MxA -88T allele, associated with high MxA production, were more prevalent in SSPE patients.
- This suggests that MxA protein may facilitate persistent MV infection in neural cells, contributing to SSPE pathogenesis.