Malaria severity and human nitric oxide synthase type 2 (NOS2) promoter haplotypes.

Abstract:

:Nitric oxide (NO) mediates host resistance to severe malaria and other infectious diseases. NO production and mononuclear cell expression of the NO producing enzyme-inducible nitric oxide synthase (NOS2) have been associated with protection from severe falciparum malaria. The purpose of this study was to identify single nucleotide polymorphisms (SNPs) and haplotypes in the NOS2 promoter, to identify associations of these haplotypes with malaria severity and to test the effects of these polymorphisms on promoter activity. We identified 34 SNPs in the proximal 7.3 kb region of the NOS2 promoter and inferred NOS2 promoter haplotypes based on genotyping 24 of these SNPs in a population of Tanzanian children with and without cerebral malaria. We identified 71 haplotypes; 24 of these haplotypes comprised 82% of the alleles. We determined whether NOS2 promoter haplotypes were associated with malaria severity in two groups of subjects from Dar es Salaam (N = 185 and N = 250) and in an inception cohort of children from Muheza-Tanga, Tanzania (N = 883). We did not find consistent associations of NOS2 promoter haplotypes with malaria severity or malarial anemia, although interpretation of these results was potentially limited by the sample size of each group. Furthermore, cytokine-induced NOS2 promoter activity determined using luciferase reporter constructs containing the proximal 7.3 kb region of the NOS2 promoter and the G-954C or C-1173T SNPs did not differ from NOS2 promoter constructs that lacked these polymorphisms. Taken together, these studies suggest that the relationship between NOS2 promoter polymorphisms and malaria severity is more complex than previously described.

journal_name

Hum Genet

journal_title

Human genetics

authors

Levesque MC,Hobbs MR,O'Loughlin CW,Chancellor JA,Chen Y,Tkachuk AN,Booth J,Patch KB,Allgood S,Pole AR,Fernandez CA,Mwaikambo ED,Mutabingwa TK,Fried M,Sorensen B,Duffy PE,Granger DL,Anstey NM,Weinberg JB

doi

10.1007/s00439-009-0753-3

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

163-82

issue

2

eissn

0340-6717

issn

1432-1203

journal_volume

127

pub_type

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