Genetic studies of low-abundance human plasma proteins. XI. Linkage analysis and population genetics of the C1S subcomponent of the first complement component

Leslie A Lyons, M. I. Kamboh, R. E. Ferrell

Research output: Contribution to journalArticle

1 Scopus citations


Although subcomponents C1r and C1s of the first complement component, C1, have been established to be in the same linkage group as the proline-rich protein gene cluster on chromosome 12p13.2, no direct analysis of linkage between the C1R and C1S structural gene loci has been available. We have detected through a population screening study 5 families which are heterozygous at the structural loci for both C1R and C1S. Three of the 5 families, 21 individuals, were informative for linkage. A maximum lod score of 1.505 at θ = 0.00 was found in a two-point analysis between C1R and C1S. Ten populations were screened for structural variation at the C1S locus. Only US Whites and a Kodiak Island Eskimo group expressed heterogeneity. The frequencies of the designated alleles, C1S*1 and C1S*2, were 0.992 and 0.007, respectively, in the US White population and 0.998 and 0.002, respectively, in the Kodiak Island Eskimo population. In addition, the product of a putative new allele, designated C1S*4, was observed in a single US White individual but segregation of this variant was not observed in the limited family data available.

Original languageEnglish (US)
Pages (from-to)81-87
Number of pages7
JournalComplement and Inflammation
Issue number2
StatePublished - 1989
Externally publishedYes


ASJC Scopus subject areas

  • Immunology
  • Hematology

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