title: Twin studies on the effect of genetic factors on serum agalactosyl immunoglobulin G levels.
abstract: The level of immunoglobulin G (IgG) lacking the terminal galactose, referred to as agalactosyl IgG, was found to be increased in chronic inflammatory diseases, such as rheumatoid arthritis and inflammatory bowel disease (IBD), particularly in Crohn's disease, which is suggested to have a genetic component. This oligosaccharide modification of IgG is mainly regulated by the expression of glyco-genes; however, the association between genetic factors and changes in the IgG glycosylation has not been fully elucidated. The aim of the present study was to assess the role of genetics in this process by comparing the serum agalactosyl IgG levels between members of monozygotic and dizygotic twin pairs who underwent medical check-ups at the same time. The serum agalactosyl IgG level was assayed using high-performance liquid chromatography. Hematological and biochemical markers, including γ-glutamyltranspeptidase (γGTP), alanine aminotransferase (ALT) and white blood cell (WBC) count, were also measured. Although the serum γGTP levels (and, to a lesser extent, ALT and WBC levels) exhibited a correlation within monozygotic twin pairs, agalactosyl IgG levels were not found to be correlated between members of either type of twin pairs. Thus, the role of genetic factors in determining serum agalactosyl IgG levels may be less significant compared to the effect of environmental factors or the onset of inflammatory disease.
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Kanako
authors.initials: K
authors.lastname: Azuma
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Shinzaki
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Hitomi
authors.initials: H
authors.lastname: Asazawa
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Eri
authors.initials: E
authors.lastname: Kuroki
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Sayuri
authors.initials: S
authors.lastname: Kawamoto
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kamada
authors.affiliation: Health Promotion Science, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Hayakawa
authors.affiliation: Departments of Molecular Biochemistry and Clinical Investigation, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Miyoshi
keywords: agalactosyl immunoglobulin G; dizygotic twin pairs; environmental factors; genetic factors; monozygotic twin pairs