Genetics of liver disease: From pathophysiology to clinical practice

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Genetics of liver disease: From pathophysiology to clinical practice Tom H. Karlsen, Frank Lammert, Richard J. Thompson  Journal of Hepatology  Volume 62, Issue 1, Pages S6-S14 (April 2015) DOI: 10.1016/j.jhep.2015.02.025 Copyright © 2015 European Association for the Study of the Liver Terms and Conditions

Fig. 1 Scope of review. With an emphasis on the developments of the last 30years, the present article aims to discuss the implications of genetic studies in liver diseases onto relevant aspects of research and clinical hepatology. Topics covered range from descriptions of basic pathophysiology to practical aspects of diagnosis and treatment of the individual patient. The examples have been selected to illustrate the utility of genetic tools for specific aspects of clinical practice. For details, see text; for gene name abbreviations, see http://www.ncbi.nlm.nih.gov/gene/. Journal of Hepatology 2015 62, S6-S14DOI: (10.1016/j.jhep.2015.02.025) Copyright © 2015 European Association for the Study of the Liver Terms and Conditions

Fig. 2 Genetic architecture of complex diseases. Genetic studies have unambiguously pinpointed a role for adaptive immune responses in causing primary sclerosing cholangitis (PSC, panel A). The overall genetic architecture of PSC shows similar features as prototypical autoimmune diseases (e.g., type 1 diabetes, panel C) and only a partial overlap with that of inflammatory bowel disease (panel B). Diseases caused by distinct exogenous factors (e.g., drug-induced liver injury, celiac disease, panel D) show a similar genetic architecture, where a strong association with genes in the major histocompatibility complex (MHC, plotted in red) is the defining feature. Plots derived from data in reference [52]; the X axis shows chromosomal location, the Y axis shows association statistic for investigated variants (individual dots). Journal of Hepatology 2015 62, S6-S14DOI: (10.1016/j.jhep.2015.02.025) Copyright © 2015 European Association for the Study of the Liver Terms and Conditions

Fig. 3 Major molecular proteins involved in genetic cholestasis. Multidrug resistance-associated protein 2 (MRP2) transports organic anion (OA) conjugates, including bilirubin, and is mutated in Dubin–Johnson syndrome. Bile salt export pump (BSEP) is the major bile acid (BA) transporter. Multidrug resistance 3 (MDR3) flops phosphatidylcholine (PC) and familial intrahepatic cholestasis protein 1 (FIC1) flips aminophospholipids (AL). TJP proteins are involved in maintaining the stability of integral tight junction proteins, including claudins. Journal of Hepatology 2015 62, S6-S14DOI: (10.1016/j.jhep.2015.02.025) Copyright © 2015 European Association for the Study of the Liver Terms and Conditions

Fig. 4 Distinguishing Mendelian from complex liver diseases. For complex phenotypes, the contribution from genetics to overall disease liability is limited (typically less than 50%). In addition, only a fraction (typically 10–20%) of the genetic susceptibility is known. In both Mendelian and complex disease manifestations the gene findings serve clues as to the underlying pathophysiology. Only for the case of Mendelian liver affections do genetic findings have clinically useful predictive power. Modified from [109]. Journal of Hepatology 2015 62, S6-S14DOI: (10.1016/j.jhep.2015.02.025) Copyright © 2015 European Association for the Study of the Liver Terms and Conditions

Journal of Hepatology 2015 62, S6-S14DOI: (10.1016/j.jhep.2015.02.025) Copyright © 2015 European Association for the Study of the Liver Terms and Conditions