1. Association Between HLA Haplotypes and Increased Serum Levels of IgG4 in Patients With Primary Sclerosing Cholangitis.
- Author
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Berntsen NL, Klingenberg O, Juran BD, Benito de Valle M, Lindkvist B, Lazaridis KN, Boberg KM, Karlsen TH, and Hov JR
- Subjects
- Biomarkers blood, Cholangitis, Sclerosing blood, Cholangitis, Sclerosing diagnosis, Gene Frequency, Genetic Predisposition to Disease, HLA-B7 Antigen genetics, HLA-B8 Antigen genetics, HLA-DRB1 Chains genetics, Humans, Norway, Phenotype, Sweden, United States, Up-Regulation, Cholangitis, Sclerosing genetics, Cholangitis, Sclerosing immunology, HLA Antigens genetics, Haplotypes, Immunoglobulin G blood
- Abstract
Increased serum levels of IgG4 have been reported in 9%-15% of patients with primary sclerosing cholangitis (PSC); it is not clear whether this increase contributes to pathogenesis. We performed genetic analyses of the HLA complex in patients with PSC from Norway, Sweden, and from the United States. We found an association between levels of IgG4 above the upper reference limit and specific HLA haplotypes. These patients had a significantly lower frequency of the strongest PSC risk factor, HLA-B*08, than patients without increased IgG4, and significantly higher frequencies of HLA-B*07 and HLA-DRB1*15. HLA genotype therefore might affect the serum concentration of IgG4, and increased IgG4 might be a marker of a distinct phenotype of PSC., (Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.)
- Published
- 2015
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