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HLA-Cw alleles associated with HLA extended haplotypes and C2 deficiency
O P Clavijo1, J C Delgado, Z L Awdeh
1Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
Insights
Researchers identified specific HLA-Cw alleles linked to extended MHC haplotypes, including a distinct association in C2 deficiency patients. These conserved genetic combinations offer insights into human evolution and aid transplant donor selection.
Area of Science:
- Immunogenetics
- Human Molecular Genetics
- Complement System Biology
Background:
- Four MHC-linked complement genes (BF, C2, C4A, C4B) are inherited as complotypes.
- Extended haplotypes were previously defined by complotype distribution with HLA-B and HLA-DR loci in Caucasians.
Purpose of the Study:
- To analyze the distribution of Human Leukocyte Antigen (HLA)-Cw alleles in relation to extended MHC haplotypes.
- To investigate specific HLA-Cw associations within Caucasian-derived extended haplotypes and C2 deficiency patients.
Main Methods:
- Studied a large panel of MHC homozygous and heterozygous cell lines representing Caucasian-derived extended haplotypes.
- Analyzed 14 patients with complete C2 deficiency.
- Assigned HLA alleles using sequence-specific oligonucleotide probe hybridization (SSOP) and family analysis for haplotype assignment.
Main Results:
- Identified distinctive and statistically significant HLA-Cw alleles associated with each independent extended haplotype.
- Found a consistent association of HLA-Cw*1203 with the [HLA-B18, S042, DR2] haplotype in C2 deficiency patients.
Conclusions:
- Conserved allelic combinations of MHC-linked genes and HLA-Cw alleles exist.
- These findings can advance the study of human evolution.
- Potential application in expediting donor selection for clinical transplantation.
Abstract:
There are four MHC-linked complement genes, BF, C2, C4A and C4B, that are inherited as single DNA units, known as complotypes. Extended haplotypes were initially defined by studying the distribution of complotypes in relation to HLA-B and HLA-DR loci in Caucasian families. In order to analyze the distribution of HLA-Cw alleles in relation to extended haplotypes, we studied a large panel of MHC homozygous and heterozygous cell lines representing previously described Caucasian-derived extended haplotypes and 14 patients with complete C2 deficiency. HLA alleles were assigned using sequence-specific oligonucleotide probe hybridization (SSOP). Family analysis served to assign haplotypes for heterozygous samples. We found distinctive HLA-Cw alleles for each independent extended haplotype. Their association in each instance was statistically significant. All patients with C2 deficiency carrying the haplotype [HLA-B18, S042, DR2] were associated with HLA-Cw*1203. These conserved allelic combinations may become an important tool for the study of human evolution and may contribute to the expeditious selection of prospective donors in clinical transplantation.