Abstract:
:Complement receptor 1 (CR1/CD35) levels on erythrocytes and related CR1 polymorphisms have been associated with response to falciparum malaria in populations inhabiting malaria-endemic regions. Differences in disease association profiles of its low expression alleles have been observed in populations from different regions of the world. We analyzed the influence of CR1 levels and associated SNPs on susceptibility/resistance to falciparum malaria in Indian populations. Two CR1 SNPs [exon 22 (A/G) and intron 27 (A/T)] define the low expression (L) CR1 allele in populations inhabiting a Plasmodium falciparum-endemic and a nonendemic region of India. Populations of the endemic region have very low red blood cell surface CR1 levels and higher frequencies of the exon 22 and intron 27 mutant L alleles. Whereas low CR1 levels correlated with susceptibility to severe malaria in the nonendemic region, high CR1 levels were associated with manifestation of disease in the endemic region. In addition, the exon 22 L allele was a risk factor for severe malaria in the nonendemic region. Absence of correlation between levels of tumor necrosis factor-alpha, interferon-gamma, and interleukin-6 with CR1 levels in patients with severe disease indicated that RBC CR1 levels in individuals are not the major determinants of pro-inflammatory cytokine release during infection. Our results are interpreted in the context of differences in the pathogenesis of severe malaria in the malaria-endemic and nonendemic region.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Sinha S,Jha GN,Anand P,Qidwai T,Pati SS,Mohanty S,Mishra SK,Tyagi PK,Sharma SK,Venkatesh V,Habib Sdoi
10.1016/j.humimm.2009.02.001subject
Has Abstractpub_date
2009-04-01 00:00:00pages
244-50issue
4eissn
0198-8859issn
1879-1166pii
S0198-8859(09)00041-Xjournal_volume
70pub_type
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