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  • Title: The human complement C8G gene, a member of the lipocalin gene family: polymorphisms and mapping to chromosome 9q34.3.
    Author: Dewald G, Cichon S, Bryant SP, Hemmer S, Nöthen MM, Spurr NK.
    Journal: Ann Hum Genet; 1996 Jul; 60(4):281-91. PubMed ID: 8865989.
    Abstract:
    Complement component C8 is a plasma glycoprotein consisting of three nonidentical polypeptide chains (alpha, beta, gamma) which are encoded by three separate genes (C8A, C8B, C8G). The gamma chain whose functional role remains undefined is not related to any other complement protein but is a member of the lipocalins, a family of proteins that bind small hydrophobic ligands. The present report describes the first known polymorphisms for the human C8G gene, namely one polymorphic site in exon 1 (207T/G) and two polymorphic sites in intron 1 (213 + 37G --> A; 213 + 65del3). Specific typing can be performed using simple polymerase chain reaction-based assays. C8G genotyping in eight CEPH reference families demonstrated that C8G is closely linked to a series of marker loci located in the most telomeric region of chromosome 9q. Multipoint analysis placed C8G with 1000:1 support distal to D9S207. C8G is thus located at 9q34.3. Remarkably, this chromosomal region contains at least four other lipocalin genes.
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