Parasites, Hosts and Diseases

  • 제40권4호
  • /
  • Pages.165-172
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  • 2002
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  • 2982-5164(pISSN)
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  • 1738-0006(eISSN)
대한기생충학·열대의학회 (The Korea Society for Parasitology and Tropical Medicine)
권호 표지

Genetic factors associated with development of cerebral malaria and fibrotic schistosomiasis

  • Hirayama, Kenji (Department of Molecular Immunogenetics, Institute of Tropical Medicine Nagasaki University)
  • 발행 : 2002.12.01
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초록

Collaborative studies have identified some genetic factors contributing to the development of severe forms of malaria and schistosomiasis. In Thailand, the $TNF-{\alpha}{\;}5'-flanking$ region shows biallelic polymorphic sites at nucleotides -238, -308, -857, -863, and -1031, and seven alleles have been identified in patients from Myanmar. We found that the TNF promoter (TNFP)-D allele was significantly associated with cerebral malaria in populations from Karen (P < 0.0001. OR ＝ 124.86) and ethnic Burma (P < 0.0001, OR = 34.50) . In China, we have identified two major genes related to the severity of liver fibrosis, one an HLA class II gene, and the other the IL-13 gene. The frequency of the HLA- DRB5*0101 allele and that of the IL-13 promoter A/A (IL- l3P- A/A) genotype were elevated in fibrotic patients, although the two genes are located on different chromosomes, chromosomes 6p and 5q, respectively Subjects with both genotypes had odds ratios (OR = 24.5) much higher than the sum of the ratios for each individual genotype (OR ＝ 5.1,95% Confidence Interval 1.3-24.7 for HLA-DRB5*0101, OR ＝ 3.1 95% CI 1.5 - 6.5 for IL-l3P-A/A). That the effects of the two susceptibility markers are synergistic rather than additive, strongly suggests that the pathogenic Th2 response directly influences the prognosis of post-schistosomal liver fibrosis.

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