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Gastroenterology Research and Practice
Volume 2012 (2012), Article ID 408723, 8 pages
http://dx.doi.org/10.1155/2012/408723
Research Article

Vitamin D Receptor Polymorphisms Predispose to Primary Biliary Cirrhosis and Severity of the Disease in Polish Population

1Medical Biology Laboratory, Pomeranian Medical University, Szczecin, Poland
2Liver Unit and Liver Research Laboratories, Pomeranian Medical University, Szczecin, Poland
3Department of Neonatal Diseases, Pomeranian Medical University, Szczecin, Poland
4Department of Clinical and Molecular Biochemistry, Pomeranian Medical University, Szczecin, Poland

Received 2 January 2012; Accepted 6 February 2012

Academic Editor: P. Gionchetti

Copyright © 2012 Agnieszka Kempińska-Podhorecka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Primary biliary cirrhosis (PBC) is a chronic cholestatic liver condition characterized by the immune-mediated damage of the intrahepatic bile ducts. Polymorphisms of vitamin D receptor (VDR) are considered to contribute to its pathogenesis however their incidence varies in different populations and their potential association with the course of the disease has not been studied. In this paper we investigated the incidence and correlation of three VDR polymorphisms (BsmI, ApaI or TaqI) with various clinical, biochemical, and serological factors in a homogenous group of 143 Caucasian patients with PBC. Control group comprises 306 DNA samples from umbilical cord blood of healthy newborn children. When compared to controls, we observed a significant dominance of the b allele in the BsmI ( O R = 1 . 6 9 [1.27–2.24]; 𝑃 = 0 . 0 0 0 3 ) and t allele in the TaqI ( O R = 0 . 6 2 [0.47–0.82], 𝑃 = 0 . 0 0 0 1 ) in patients with PBC. Moreover the BsmI and TaqI polymorphisms were associated with the presence of advanced fibrosis/liver cirrhosis at the diagnosis of PBC. Pairwise linkage disequilibrium (LD) calculations proved that the analyzed SNPs are within an LD block (100% of LDs were 𝐷 > 0 . 9 ). Our study showed, for the first time, that the analyzed polymorphisms of VRD may exert an effect on a natural history of PBC.