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Association of cholecystokinin A receptor gene polymorphism with cholelithiasis and the molecular mechanisms of this polymorphism

  • Gastroenterology and genetics—polymorphic gene and disease-caused gene
  • Published:
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Abstract

Background. The etiology of gallstone formation is multifactorial, and genetic factors are involved. The genetic variations of cholecystokinin A receptor (CCK-AR) in patients having gallstones and the molecular mechanisms of this polymorhpism were examined. The involvement of CCK-AR in gallstone formation was confirmed using CCK-AR gene knockout mice. Methods. CCK-AR gene expression was determined by Northern transfer analysis in gallbladders with or without gallstones. Genetic variations were determined by Southern blot and by direct sequencing. Molecular mechanisms in terms of the transcriptional activity and methylation status were examined. Finally, we investigated whether gallstone formation was enhanced in CCK-AR gene knockout mice. Results. The gene expression of CCK-AR was significantly decreased in gallbladders with gallstones compared to those without gallstones. No genetic variations were detected in the coding region, but two sequence variations were detected in the promoter region in gallstone patients. However, no significant differences were found for the promoter activities of polymorphic promoter constructs. In contrast, less methylation in the promoter region was related to substantial expression of the CCK-AR gene. Gallstone formation was enhanced in CCK-AR gene knockout mice. The homozygote (GG/TT) polymorphism of the CCK-AR gene showed a significantly higher percentage of body fat. Conclusions. Deteriorating gallbladder contractions, possibly induced by alterations in the CCK-AR gene, as well as CCK-AR gene polymorphism, promoted gallstone formation.

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Authors and Affiliations

  1. Department of Clinical Physiology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashiku, Tokyo, 173-0015, Japan

    Kyoko Miyasaka

  2. Department of Gastroenterology, National Kyushu Cancer Center, Fukuoka, Japan

    Yutaka Takata & Akihiro Funakoshi

Authors
  1. Kyoko Miyasaka
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  2. Yutaka Takata
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  3. Akihiro Funakoshi
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Miyasaka, K., Takata, Y. & Funakoshi, A. Association of cholecystokinin A receptor gene polymorphism with cholelithiasis and the molecular mechanisms of this polymorphism. J Gastroenterol 37 (Suppl 14), 102–106 (2002). https://doi.org/10.1007/BF03326426

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  • DOI: https://doi.org/10.1007/BF03326426

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