title: Association analysis of SLC22A4, SLC22A5 and DLG5 in Japanese patients with Crohn disease.
abstract: Crohn disease (CD) is an inflammatory bowel disease characterized by chronic transmural, segmental, and typically granulomatous inflammation of the gut. Recently, two novel candidate gene loci associated with CD, SLC22A4 and SLC22A5 on chromosome 5 known as IBD5 and DLG5 on chromosome 10, were identified through association analysis of Caucasian CD patients. We validated these candidate genes in Japanese patients with CD and found a weak but possible association with both SLC22A4 (P=0.028) and DLG5 (P=0.023). However, the reported genetic variants that were indicated to be causative in the Caucasian population were completely absent in or were not associated with Japanese CD patients. These findings imply significant differences in genetic background with CD susceptibility among different ethnic groups and further indicate some difficulty of population-based studies.
authors.affiliation: Laboratory of Molecular Medicine, Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Yamazaki
authors.affiliation: Department of Medicine, Division of Gastroenterology, Social Insurance Central General Hospital, Tokyo, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Takazoe
authors.affiliation: Department of Medicine, Division of Gastroenterology, Social Insurance Central General Hospital, Tokyo, Japan.
authors.forename: Torao
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: Department of Medicine, Division of Gastroenterology, Suzaki Kuroshio Hospital, Kouchi, Japan.
authors.forename: Toshiki
authors.initials: T
authors.lastname: Ichimori
authors.affiliation: Laboratory for Genotyping, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Saito
authors.affiliation: Laboratory for Genotyping, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan.
authors.forename: Aritoshi
authors.initials: A
authors.lastname: Iida
authors.affiliation: Laboratory for Gastrointestinal Diseases, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Onouchi
authors.affiliation: Laboratory for Gastrointestinal Diseases, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Hata
authors.affiliation: Laboratory of Molecular Medicine, Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan. yusuke@ims.u-tokyo.ac.jp.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakamura
mesh_terms: D016022:Case-Control Studies; D002879:Chromosomes, Human, Pair 10 / Q000235:genetics*; D002895:Chromosomes, Human, Pair 5 / Q000235:genetics*; D003424:Crohn Disease / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006801:Humans; D007564:Japan; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D040641:Quantitative Trait Loci / Q000235:genetics*; D044465:White People
chemical_list: D008565:Membrane Proteins