A polymorphism was identified in the coding region of the human C5a anaphylatoxin receptor gene leading to C to T transition at nucleotide position 450 (a silent substitution in the Ala150 codon, GCC to GCT). Its distribution was studied in a population of healthy volunteers from the Québec city region (prevalence of 2.8%) and among patients with end-stage renal failure who had previously undergone renal graft (prevalence 1.4%, not significantly different from that of the control group). This new marker provides a valuable tool to assess the risk for putative C5a-associated disorders with genetic determinism.
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