A/Prof John O’Sullivan
MB BCh BAO, MMedSci, PhD, Cert. Biostat (Harvard), FRACP, FRCPI, FAHA

Clinical Academic Cardiologist
Leader of the Cardiometabolic Disease Group, Charles Perkins Centre and Heart Research Institute, University of Sydney
Associate Professor, Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney
Adjunct Professor, Faculty of Medicine, TU Dresden, Germany
  • A/Prof John O’Sullivan is a Clinical-Academic Cardiologist at the University of Sydney and the Royal Prince Alfred Hospital. He completed his medical training (MB BCh BAO) at the National University of Ireland, Galway, then internal medicine training (FRCPI) and cardiology training (CSCST, RCPI) with the Royal College of Physicians of Ireland.

    During his cardiology training, John was awarded a prestigious Molecular Medicine Ireland Clinician-Scientist Fellowship (2008-2011), which funded his PhD studying novel therapeutics and imaging modalities in myocardial infarction. His PhD (awarded 2012) was highly successful, receiving recognition by way of Young Investigator Awards from the American College of Cardiology (1st Place), American Heart Association (Melvin Judkins Award) (separate projects), and Irish Cardiac Society (1st Place), and was awarded Fellowship of the American Heart Association (FAHA) in 2011.

    John undertook postdoctoral training in functional genomics and metabolomics at the Massachusetts General Hospital and Harvard Medical School. Whilst at Harvard, John received the MGH Tosteson Award for Medical Discovery, a research award at the prestigious MGH Annual Scientific Advisory Committee Meeting, and a further Young Investigator Award at the AHA.

    In late 2016, John moved to Sydney and undertook a fellowship in cardiac imaging and MRI at the Royal Prince Alfred Hospital, receiving FRACP (2019). He was awarded the NSW Ministerial Award for Rising Stars in Research Excellence (2016), a Chapman Fellowship by Sydney Medical School (2018), and an EMCR Fellowship (2018-2020) and Clinician-Scientist Fellowship (2019-2021) from the NSW Ministry of Health. John is also group leader at HRI, and was recently appointed adjunct Professor at TU Dresden Medical School in Germany.

    John has a clinical interest in Heart Failure preserved Ejection Fraction (HFpEF), and has established a HFpEF clinic at RPAH with his colleague Dr Sean Lal. Together, they run a basic science group at the Charles Perkins Centre of the University of Sydney, where they apply a range of tools for fundamental discovery in this disease.
  • John has clinical and research interests in heart failure, particularly Heart Failure preserved Ejection Fraction (HFpEF), a type of heart failure that now accounts for more than half of all heart failure cases, but for which there are no treatments. He uses a range of tools to study this disease, including cardiac MRI. Employing new insights from his HFpEF research program, he aims to offer the most up-to-date, evidence-based therapeutic strategies to help patients with this disease.

    John has a strong clinical interest in cardiometabolic disease: how unhealthy diet, overweight / obesity, and insulin resistance interact with cardiovascular disease, driving atherosclerosis and heart failure. He also studies the role of the microbiome in these diseases.

    Cardiovascular prevention, particularly how to employ the latest evidence in dietary science and exercise to prevent and manage cardiovascular disease, is a core focus of John’s clinical interests.
  • Myocardial Metabolic Perturbations in Advanced Ischemic and Non-Ischemic Dilated Human Heart Failure. Jacob Cao, Yen Chin Koay, Lake-Ee Quek, Benjamin Parker, Sean Lal*, John F. O’Sullivan*. European Journal of Heart Failure, 2019 Aug;21(8):1042-1045. doi: 10.1002/ejhf.1479. Epub 2019 Jun 11. PMID: 31184404.
    Ingestion of resistant starch by mice markedly increases microbiome-derived metabolites. Yen Chin Koay*, Jibran A. Wali*, Alison W. S. Luk, Laurence Macia, Victoria C. Cogger, Tamara J. Pulpitel, Devin Wahl, Samantha M. Solon-Biet, Andrew Holmes, Stephen J. Simpson, John F. O’Sullivan. FASEB J 2019. Mar 29:fj201900177R. doi: 10.1096/fj.201900177R. PMID: 30925066.
    Metabolites downstream of predicted loss-of-function variants inform relationship to disease. Mengbo Li, Andy Wang, Lake-Ee Quek, Stephen Vernon, Gemma A. Figtree, Jean Yang, John F. O’Sullivan. Mol Genetics and Metab (https://doi.org/10.1016/j.ymgme.2019.10.002) (Epub ahead of print).
    MiRNA93-5p is a Novel Predictor of Coronary Artery Instent Restenosis. John F. O’Sullivan, Antoinette Neylon, Eoin F. Fahey, Pengyi Yang, Catherine McGorrian, Gavin J. Blake. Heart Asia. 2019 Feb 22;11(1):e011134. doi: 10.1136/heartasia-2018-011134. eCollection 2019. PMID: 31031831.

    Branched chain amino acids impact health and lifespan indirectly via diet balance and appetite control. Samantha M Solon-Biet, Victoria C Cogger, Tamara Pulpitel, Devin Wahl, Ximonie Clark, Alistair Senior, Qiaoping Wang, Amanda Brandon, Ruth Perks, John F. O’Sullivan, Yen C Koay, Kim Bell-Anderson, Melkam Kebede, Belinda Yau, Clare Atkinson, Gunbjorg Svineng, Rosilene Waern, Jibran A Wali, Matthew D Piper, Robert Cumming Vasant Hirani, David J Handelsman, Paula Juricic, Linda Partridge, David Raubenheimer, Gregory Cooney, David G Le Couteur , Stephen J Simpson. Nature Metabolism, volume 1, pages532–545 (2019).
    Dimethylguanidino valeric acid is a marker of liver fat and predicts diabetes. John F O’Sullivan, Jordan E Morningstar, Baohui Zheng, Sarah Jeanfavre, Justin Scot, Qiong Yang, Celine Fernandez, Ramachandran S. Vasan, Michelle T. Long, Olle Melander, Thomas J. Wang, Caroline Fox, Randall T. Peterson, Clary Clish, Kathleen Corey, Robert E. Gerszten. J Clin Invest. 2017 Dec 1;127(12):4394-4402. PMID: 29083323.
    Metabolite Profiles and the Risk of Cardiometabolic Disease. O’Sullivan J, Gerszten RE Eur Heart J 2014; 35; 2197–2204. DOI: 10.1093/eurheartj/ehu270.
    Induced Pluripotent Stem Cell Differentiation Enables Functional Validation of GWAS Variants in Metabolic Disease. Curtis R. Warren, John F. O’Sullivan, Max Friesen, Caroline E. Becker, Xiaoling Zhang, Yoshi Wakabayashi, Jordan E. Morningstar, Xu Shi, Jihoon Choi, Fang Xia, Mary H. C. Florido, Jennifer Shay, Derek T. Peters, Kiran Musunuru, Sekar Kathiresan, Laurence Daheron, Jun Zhu, Robert E. Gerszten, Rahul Deo, Vasan Ramachandran, Christopher J. O’Donnell, and Chad A. Cowan. Cell Stem Cell 2017 Apr 6;20(4):547-557. PMID: 28388431.
    Metabolite Profiling Identifies Anandamide as a Biomarker of Nonalcoholic Steatohepatitis. Taylor Kimberly, John O’Sullivan, Anjali Nath, Michelle Keyes, Qiong Yang, Martin G. Larson, Vasan Ramachandran, Randall T. Peterson, Thomas J. Wang, Kathleen Corey, and Robert E. Gerszten. J Clin Invest. Insight 2017 May 4;2(9). PMID: 28469090.
    Aptamer-based proteomic profiling reveals novel candidate biomarkers of cardiovascular disease. Debby Ngo, Sumita Sinha, Dongxiao Shen, Eric Kuhn, Michelle Keyes, Xu Shi, Mark Benson, John F. O’Sullivan, Hasmik Keshishian, Laurie Farrell, Michael A. Fifer, Ramachandran S. Vasan, Marc Sabatine, Martin G. Larson , Steven A. Carr,  Thomas J. Wang, Robert E. Gerszten. Circulation 2016; 134:270-285. PMID: 27444932.
    Integrative analysis of iPS cell models of PRKAG2 cardiomyopathy identifies AMPK as a regulator of cardiomyocyte survival, contractility and fibrosis in microtissues. Travis Hinson, Anant Chopra, Calvin C. Sheng, Rajat M. Gupta, Rajarajan Kuppusamy, John F. O’Sullivan, Glenn Rowe, Joshua Gorham, Kiran Musunuru, Robert E. Gerszten, Sean M. Wu, Christopher Chen, Jonathan E. Seidman, Christine E. Seidman. Cell Reports 2016 Dec 20;17(12):3292-3304. PMID: 28009297.
    Rapid and efficient generation of vascular endothelial and smooth muscle cells from human pluripotent stem cells. Christoph Patsch, Ludivine Challet-Meylan, Eva Christina Thoma, Eduard Urich, Tobias Heckel, John F O’Sullivan, Stephanie J Grainger, Friedrich G Karpp, Lin Sun, Klaus Christensen, Yulei Xia, Marie Florido, Wei He, Wei Pan, Michael Prummer, Curtis Warren, Oliver Wernet, Roland Jakob-Roetne, Ulrich Certa, Ravi Jagasia, Per-Ola Freskgård, Isaac Adatto, Dorothee Kling, Paul Huang, Leonard I Zon, Elliot Chaikof, Robert E. Gerzsten, Martin Graf, Roberto Iacone and Chad A. Cowan. Nature Cell Biology 2015 Aug;17(8):994-1003. PMID: 26214132.
    Increases in Myocardial Workload Induced by Rapid Atrial Pacing Trigger Alterations in Global Metabolism. Turer AT, Lewis GD, O'Sullivan JF, Elmariah S, Mega JL, Addo TA, Sabatine MS, de Lemos JA, Gerszten RE. PLoS One. 2014 Jun 16;9(6):e99058. PMID: 24932507.
    β-Aminoisobutyric Acid Increases Browning of White Fat and Hepatic β-Oxidation and is Inversely Correlated with Cardiometabolic Risk Factors in Humans. Lee D. Roberts, Pontus Boström, John F. O'Sullivan, Robert T. Schinzel, Gregory D. Lewis, Youn-Kyoung Lee, Melinda J. Palma, Sondra Calhoun, Ming-Huei Chen, Vasan S. Ramachandran, Martin G. Larson, Claude Bouchard, Tuomo Rankinen, Amanda L. Souza, Clary B. Clish, Thomas J. Wang, Alexander A. Soukas, Chad A. Cowan, Bruce M. Spiegelman, Robert E. Gerszten. Cell Metabolism Volume 19, Issue 1, 96-108, 7 January 2014. PMID: 24411942.
    2-aminoadipic acid is a novel biomarker of diabetes risk and modulates glucose homeostasis. Wang TJ, Ngo D, Psychogios N, Dejam A, Larson MG, Vasan RS, Ghorbani A, O'Sullivan J, Cheng S, Rhee EP, Sinha S, McCabe E, Fox CS, O'Donnell CJ, Ho JE, Florez JC, Magnusson M, Pierce KA, Souza AL, Yu Y, Carter C, Light PE, Melander O, Clish CB, Gerszten RE. J Clin Invest. 2013 Oct 1;123(10):4309-4317. PMID: 24091325.
    Multi Detector Computed Tomography Accurately Defines Infarct Size, but not Microvascular Obstruction After Myocardial Infarction (MI). John F O’Sullivan, MD, PhD, Anne-Laure Leblond, PhD, John O’Dea, MD, Ivalina Hristova, BS, Sujith Kumar, DMRIT, Noel M Caplice, MD, PhD. J Am Coll Cardiol. 2013;61(2):208-210. PMID: 23177294.
    Microribonucleic acids for Prevention of Plaque Rupture and Instent Restenosis: “A Finger in the Dam”. John F O’Sullivan, Kenneth Martin, Noel M Caplice. State of the Art Paper. J Am Coll Cardiol 2011 Jan 25;57(4):383-9. PMID: 21251577.
    Potent Long-term Cardioprotective Effects of Single Low Dose Insulin-like Growth Factor-1 (LD-IGF-1) Treatment Post Myocardial Infarction. John F O’Sullivan, Anne-Laure Leblond, Geraldine Kelly, Arun HS Kumar, Pat Metharom, Ivalina Hristova, Niki Alizadeh-Vikali, Brian G Hynes, Rosemary O’Connor, Noel M Caplice. Circulation: Cardiovascular Interventions 2011;4:327-335. PMID: 21712526.
    Potent EPC conditioned media induced anti-apoptotic, cardiotrophic and proangiogenic effects post myocardial infarction are mediated by IGF1. Brian Hynes, Arun HS Kumar, John O’Sullivan, Anne-Laure Leblond, Sharon Weiss, Jeffrey Schmeckpeper, Kenneth Martin, Noel M Caplice. Eur Heart J 2011 Dec 15. PMID: 22173909.
    Thrombin Stimulates Smooth Muscle Cell Differentiation From Peripheral Blood Mononuclear Cells via Protease-Activated Receptor-1, RhoA, and Myocardin. Kenneth Martin, Sharon Weiss, Pat Metharom, Jeffrey S Schmeckpeper, Brian G Hynes, John F O’Sullivan, Noel M Caplice. Circulation Research 2009;105:214-218. PMID: 19574550.
    Soft tissue neoplasm invading the heart with associated thrombus in a 74 year old man. John O'Sullivan, David Kerins, Peter McEneaney, Carl Vaughan Eur J Echocardiogr. 2007 Jul 30. PMID: 17669689.
    Massive thrombus in the aortic arch: A 59-year-old lady with an unknown familial predisposition to vascular thrombosis. O’Sullivan J, Kerins D, Vaughan C. Eur J Echocardiogr. 2007 Sep 19. PMID: 17888744.