Human Molecular Genetics Advance Access originally published online on July 6, 2004
Human Molecular Genetics 2004 13(17):1951-1958; doi:10.1093/hmg/ddh201
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Human Molecular Genetics, Vol. 13, No. 17 © Oxford University Press 2004; all rights reserved
Affected sib-pair analysis of the contribution of HLA class I and class II loci to development of cervical cancer
1Department of Genetics and Pathology, Section of Medical Genetics, Rudbeck Laboratory, University of Uppsala, S-751 85 Uppsala, Sweden and 2Roche Molecular Systems, Berkeley, CA, USA
Received March 29, 2004; Accepted June 22, 2004
Cervical cancer is a multifactorial disease and infection by oncogenic human papilloma viruses represents the main environmental risk factor. Only a subset of infections becomes persistent and develops into cancer, implying that genetic susceptibility factors are needed for malignant progression. Here, we use a population-based cohort of affected sib-pairs (ASPs) to examine the role of the human leukocyte antigen (HLA) class I and class II loci in cervical cancer susceptibility. Analysis of 278 ASPs revealed significant excess genetic sharing for all three HLA class II loci studied, DPB1, DQB1 and DRB1, with the strongest evidence for DQB1 and DRB1. No evidence of excess sharing was observed for the HLA class I HLA-B and HLA-A loci. When the material was stratified on the basis of the DQB1*0602/DRB1*1501 susceptibility haplotype, carriers showed significant sharing for all loci, whereas non-carriers showed no evidence of excess genetic sharing at any of the loci. However, for the DPB1 locus there was no difference in allele frequency between carriers and non-carriers indicating that the effect seen in DPB1 is not simply due to linkage disequilibrium. Our results show that the HLA class II represents a major genetic susceptibility locus to cervical cancer in contrary to the class I that do not appear to have a significant impact on predisposition to the disease. The strongest class II effects are coming from the DQB1 and DRB1 loci, but the DPB1 locus also contributes to the susceptibility to cervical cancer.
* To whom correspondence should be addressed. Tel: +46 184714909; Fax: +46 184714931; Email: ulf.gyllensten{at}genpat.uu.se
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