Studies of the 6.7 family of dispersed genomic fragments within the MHC class I region

Laurent Pichon, Charles Venditti, James Harris, Amy Ten Elshof, Mario Pinelli, Michael Chorney

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2 Scopus citations


Searches for MHC-encoded disease susceptibility genes have led to considerable knowledge of the content of the class I region. In an effort to further understand the nature of the five 6.7 family members previously mapped to this region of the genome, we have further analyzed the cross-reactive members of the family and have observed additional genomic instability within the HLA-A subregion. Such genomic variation may underscore the slower evolutionary rates of the HLA-A allelic family and the extended linkage disequilibrium of markers distal to this locus. Moreover, one of the largest genes associated with a member of the 6.7 family, the 3.8-1 gene found proximal to HLA-B, was found to demonstrate limited, composite similarity to RAG2 and complement C4a gene sequences. A pancreas-specific transcript embedded in a 6.7 cross-reactive fragment was found distal to HLA-H and suggests that the fragments have remained linked to transcriptionally active chromatin comprised of both a major class I gene and a second novel coding sequence since the time of their dispersal. The absence of a 6.7 fragment in the HLA-B subregions of higher nonhuman primates lends credence to the possibility that the great apes have suffered a recent deletion event within this region following the emergence of Homo sapiens.

Original languageEnglish (US)
Pages (from-to)131-140
Number of pages10
JournalExperimental and Clinical Immunogenetics
Issue number2
StatePublished - Oct 1997

All Science Journal Classification (ASJC) codes

  • Immunology
  • Genetics
  • Genetics(clinical)


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