Volume 139, Issue 3, Pages 836-845.e1 (September 2010) Genetic Covariance Between γ-Glutamyl Transpeptidase and Fatty Liver Risk Factors: Role of β2-Adrenergic Receptor Genetic Variation in Twins Rohit Loomba, Fangwen Rao, Lian Zhang, Srikrishna Khandrika, Michael G. Ziegler, David A. Brenner, Daniel T. O'Connor Gastroenterology Volume 139, Issue 3, Pages 836-845.e1 (September 2010) DOI: 10.1053/j.gastro.2010.06.009 Copyright © 2010 AGA Institute Terms and Conditions
Figure 1 Heritability (h2) estimates of γ-glutamyl transpeptidase (GGT) and fatty liver risk factors are shown in the present twin cohort. These h2 estimates (±standard error of mean) are similar to previously published studies, suggesting generalizability of findings from our cohort. GGT has substantial heritability, at 49% ± 8%. BMI, body mass index; DBP, diastolic blood pressure; LDL, low-density lipoprotein. Gastroenterology 2010 139, 836-845.e1DOI: (10.1053/j.gastro.2010.06.009) Copyright © 2010 AGA Institute Terms and Conditions
Figure 2 Linkage disequilibrium (LD) across the β2-adrenergic receptor (ADRB2) locus using Haploview. Darker block color denotes stronger pair-wise correlation among single nucleotide polymorphisms, within one major LD block. Gastroenterology 2010 139, 836-845.e1DOI: (10.1053/j.gastro.2010.06.009) Copyright © 2010 AGA Institute Terms and Conditions
Figure 3 (A) β2-adrenergic receptor (ADRB2) haplotype-1 (AGGCCGGGC) effect on γ-glutamyl transpeptidase (GGT) in age-/sex-adjusted models. Results demonstrate a significant association (P < .024), suggesting that ADRB2 plays a role in regulation of GGT secretion. (B) ADRB2 haplotype-1 (AGGCCGGGC) increases both GGT and triglycerides in plasma. Results illustrate the pleiotropic effect of ADRB2 genetic variation on fatty liver risk factors. Gastroenterology 2010 139, 836-845.e1DOI: (10.1053/j.gastro.2010.06.009) Copyright © 2010 AGA Institute Terms and Conditions
Supplementary Figure 1 ADRB2 haplotype (AGGCCGGGC) excluding HWE-violating SNP (T-47C) increases both GGT and triglycerides in plasma. Results illustrate the pleiotropic effect of ADRB2 genetic variation on fatty liver risk factors. Gastroenterology 2010 139, 836-845.e1DOI: (10.1053/j.gastro.2010.06.009) Copyright © 2010 AGA Institute Terms and Conditions