Abstract
N-formylpeptides are phagocyte chemoattractants that act by binding to two structurally related receptors, FPR (formylpeptide receptor) and FPRL1R (FPR-like-1 receptor), which are encoded by the human genes FPR1 and FPRL1. Single nucleotide polymorphisms (SNPs) in the FPR coding region have been reported and two have been associated with the disease juvenile periodontitis; however, their frequency and linkage relationships are unknown. Here we systematically analyzed polymorphism in the open reading frames of FPR1 and FPRL1 by direct sequencing of cloned alleles from random blood donors from North America. For FPR1 we detected five non-synonymous SNPs and two synonymous SNPs in a sample of 26 chromosomes one each from 17 Caucasian and nine black random blood donors. Although all five non-synonymous SNPs were common in Caucasians, Blacks, and Asians, notable differences in allele frequency were found for each SNP in the different racial groups, suggesting differential selective pressures. We found that the FPR1 polymorphisms are linked in 15 common haplotypes. No polymorphisms were detected in FPRL1 after sampling 44 chromosomes from 36 random blood donors from the same three racial groups. Thus FPR1 and FPRL1, though they originated from a common gene, appear to have undergone markedly different evolutionary events.
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Acknowledgements
We thank Dr George Zhang of the Laboratory of Host Defenses of the National Institute of Allergy and Infectious Disease of the National Institutes of Health, Bethesda, MD for helpful discussions regarding FPR evolution.
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ASR is supported by a grant from the Pan-American Fellowship, US-Mexico Cooperative Biomedical and Behavioral Research Program (CoBRP), United States National Institutes of Health and Mexican National Council for Science and Technology (CONACYT).
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Sahagun-Ruiz, A., Colla, J., Juhn, J. et al. Contrasting evolution of the human leukocyte N-formylpeptide receptor subtypes FPR and FPRL1R . Genes Immun 2, 335–342 (2001). https://doi.org/10.1038/sj.gene.6363787
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DOI: https://doi.org/10.1038/sj.gene.6363787
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