Extensive genomic and functional polymorphism of the complement control proteins

Immunogenetics. 2005 Dec;57(11):805-15. doi: 10.1007/s00251-005-0049-2. Epub 2005 Nov 11.


Using combinations of genomic markers, we describe more than 20 distinct ancestral haplotypes (AH) of complement control proteins (CCPs), located within the regulators of complement activation (RCA) alpha block at 1q32. This extensive polymorphism, including functional sites, is important because CCPs are involved in the regulation of complement activation whilst also serving as self and viral receptors. To identify haplotypes, we used the genomic matching technique (GMT) based on the pragmatic observation that extreme nucleotide polymorphism is packaged with duplicated sequences as polymorphic frozen blocks (PFB). At each PFB, there are many alternative sequences (haplotypes) which are inherited faithfully from very remote ancestors. We have compared frequencies of RCA haplotypes and report differences in recurrent spontaneous abortion (RSA) and psoriasis vulgaris (PV).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Chromosomes, Human, Pair 1
  • Complement Activation*
  • Female
  • Gene Dosage
  • Gene Duplication
  • Gene Frequency
  • Genetic Markers
  • Genetic Techniques
  • Haplotypes
  • Humans
  • Membrane Cofactor Protein / genetics
  • Molecular Sequence Data
  • Polymorphism, Genetic
  • Pregnancy
  • Receptors, Complement / genetics
  • Receptors, Complement 3b / genetics
  • Reproducibility of Results
  • Sequence Homology


  • CR1L protein, human
  • Genetic Markers
  • Membrane Cofactor Protein
  • Receptors, Complement
  • Receptors, Complement 3b

Associated data

  • GENBANK/DQ007054
  • GENBANK/DQ007055
  • GENBANK/DQ007056
  • GENBANK/DQ007057
  • GENBANK/DQ007058
  • GENBANK/DQ007059
  • GENBANK/DQ007060
  • GENBANK/DQ007061
  • GENBANK/DQ007062
  • GENBANK/DQ007063
  • GENBANK/DQ007064
  • GENBANK/DQ007065
  • GENBANK/DQ007066
  • GENBANK/DQ007067
  • GENBANK/DQ007068
  • GENBANK/DQ007069
  • GENBANK/DQ007070
  • GENBANK/DQ007071
  • GENBANK/DQ007072
  • GENBANK/DQ007073
  • GENBANK/DQ007074
  • GENBANK/DQ007075
  • GENBANK/DQ007076