Johan Bjorkegren, MD, PhD
- PROFESSOR | Genetics and Genomic Sciences
- PROFESSOR | Medicine, Cardiology
Focusing on cardiovascular diseases, the goal of my research is to use multi-modal big data analysis to create reliable network models of human biology and disease. Network models have enormous potential to improve our ability to predict disease risk, identify new therapeutic targets, and to monitor molecular effects of treatments. To achieve this goal, I have designed and generated a range of clinical datasets of cardiovascular disease that combine detailed clinical characteristics with imaging, genomics, proteomics, and other types of data. My research has long focused on cardiovascular disease. My early work explored the role of triglyceride-rich lipoproteins in coronary artery disease (CAD), and my postdoctoral studies in mouse models established the hepatic gene microsomal triglyceride transfer protein as a key target to lower plasma cholesterol levels and reduce atherosclerosis. Since then, my primary focus has been systems analyses to generate network models from large genomic datasets—both from CAD patients in the clinic and from cellular and mouse models of atherosclerosis progression and regression in the laboratory. Throughout the last decade, I have designed and led a range of clinical and mouse model studies to elucidate the inherit complexity of CAD. As one of the first clinical scientists to apply the emerging technologies of molecular profiling to large patient cohorts, I have revealed the role of functionally associated genes in several molecular networks that drive CAD. A common complex disease such as CAD cannot be understood nor cured by targeting isolated genes. Rather, the focus needs to be on molecular disease processes mirrored by regulatory-gene networks that capture the combined effects of many genetic and environmental risk factors. To this end, and before my arrival at Mount Sinai, much of my time has gone into gathering a truly unique biobank from CAD patients undergoing different forms of heart surgery. The Stockholm-Tartu Atherosclerosis Reverse Network Engineering Task (STARNET) is a joint study initiative between the cardiovascular chief surgeon at the Tartu University Hospital in Estonia, Dr. Arno Ruusalepp, and myself. Using the STARNET bio-bank in collaboration with the Department of Genetics and Genomic Sciences here at Mount Sinai, we have now generated RNA sequence data from up to nine CAD-relevant tissues isolated from over 500 hundred clinically well–characterized patients. This unprecedented dataset is the main resource for our current efforts to generate network models that predict the risk for and clinical outcomes of CAD. My entrepreneurial ambitions have focused on translating the results of our systems genetic research into new therapies and diagnostics for patients at risk for or suffering CAD. I have launched several entrepreneurial projects. Of particular importance is Clinical Gene Networks AB—the first Bio-IT company in Sweden, founded in 2003 with the goal of exploring “clinical” networks to generate the next generation of diagnostics and therapies based on network models of complex diseases. I am exited to be a member of the exceptional team at the Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multi-scale Biology, led by Eric E. Schadt. Eric and I have a longstanding collaboration based on similar ideas despite wide difference in our basic training. I am privileged to be part of this world-leading research center. It allows me to achieve my goals through access to a diversity of skills and talented collaborators.
Multi-Disciplinary Training AreaGenetics and Genomic Sciences [GGS]
MD, Karolinska University Hospital
PhD, Karolinska Institutet
Hauberg M, Giambartolomei C, Franzen O, Morris D, Vyse T, Ruusalepp A, Sklar P, Schadt E, Bjorkegren J, Roussos P. Large-Scale Identification of Common Trait and Disease Variants Affecting Gene Expression.. American Journal of Human Genetics 2017 May;.
Baliga N, Bjorkegren J, Boeke J, Boutros M, Crawford N. The State of Systems Genetics in 2017 . Cell Systems 2017 2017 January ;.
Franzen O, Cohain A, Kovacic J, Losic B, Hao K, Schadt E, Roussos P, Bjorkegren J. Cardiometabolic risk loci share downstream cis- and trans- gene regulation across tissues and diseases. . Science 2016 August ;.
Miller C, Pjanic M, Nguyen T, Cohain A, Bjorkegren J. Integrative functional genomics identifies regulatory mechanisms at coronary artery disease loci. . Nature Communications 2016 July ;.
Talukdar H, Foroughi A, Jain R, Ermel R, Kidd B, Giannarelli C, Kovacic J, Bjorkegren J. Cross-Tissue Regulatory Gene Networks in Coronary Artery Disease. . Cell Systems 2016 March ;.
Bjorkegren J, Kovacic J, Dudley J, Schadt E. Genome-wide significant loci: how important are they? Systems genetics to understand heritability of coronary artery disease and other common complex disorders.. Journal of the American College of Cardiology 2015 March ;.
Bjorkegren J, Hagg S, Talukdar H, Foroughi H, Jain R, Cedergren C, Shang M, Rossignoli A, Takolander R, Melander O, Hamsten A, Michoel T, Skogsberg J. Plasma Cholesterol–Induced Lesion Networks Activated before Regression of Early, Mature, and Advanced Atherosclerosis. PLos Genetics 2014 February;.
Bjorkegren J, Shang M, Talukdar H, Hofmann J, Niaudet C, Asl H, Jain R, Rossignoli A, Cedergren C, Silveira A, Gigante B, Leander K, Faire U, Hamsten A, Russalepp A, Melander O, Ivert T, Michoel T, Shadt E, Betsholtz C, Skogsberg J. Lim domain binding 2: a key driver of transendothelial migration of leukocytes and atherosclerosis. Arteriosclerosis, thrombosis, and vascular biology 2014;.
Bjorkegren J, Schadt E. New (Network Enabled Wisdom) in Biology, Medicine and Health Care. Science Translational Medicine 2012 January;.
Hagg S, Salehpour M, Noori P, Lundstrom J, Possnert G, Takolander R, Konrad P, Rosfors S, Ruusalepp A, Tegner J, Skogsberg J, Bjorkegren J. Carotid Plaque Regeneration Time Is a Feature of Plaque Stability Inversely Related to Levels of Plasma Insulin. PLoS ONE 2011 April;.
Hagg S, Skogsberg J, Lundstrom J, Noori P, Nilsson R, Zhong H, Maleki S, Shang M, Brinne B, Bradshaw M, Bajic V, Samnegard A, Silveira A, Kaplan L, Gigante B, Leander K, de Faire U, Rosfors S, Lockowandt U, Liska J, Konrad P, Takolander R, Franco-Cereceda A, Schadt E, Ivert T, Hamsten A, Tegner J, Bjorkegren J. Multi-organ expression profiling uncovers a gene module in coronary artery disease involving transendothelial migration of leukocytes and LIM domain binding 2: the Stockholm Atherosclerosis Gene Expression (STAGE) study. PLoS Genetics 2009 December;.