John C. Yoon, M.D., Ph.D. for UC Davis Health

John C. Yoon, M.D., Ph.D.

Assistant Professor, Division of Endocrinology

To see if John C. Yoon is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).



Endocrinology, Diabetes, and Metabolism

Locations and Contact

Lawrence J. Ellison Ambulatory Care Center

Endocrinology, Diabetes & Metabolism Clinic
4860 Y St.
Sacramento, CA 95817

Get Directions

Phone: 916-734-2737

Additional Numbers

Clinic Fax


Clinic Referral Phone

800-2-UCDAVIS (800-282-3284)

Physician Referrals

800-4-UCDAVIS (800-482-3284)

Clinical Interests

Dr. Yoon's clinical interest is diabetes mellitus.

Research/Academic Interests

Dr. Yoon is interested in molecular studies of metabolic regulation and human disease. Ongoing work utilizes a combination of experimental systems and approaches to investigate the roles of several molecules that his laboratory has identified as controlling energy balance in cells and organisms.

A sustained positive energy balance from excessive dietary intake and/or reduced energy expenditure results in obesity, predisposing to diabetes and other serious medical conditions. While most available anti-obesity drugs work by suppressing appetite, increasing energy expenditure via thermogenesis is an alternative and promising approach to improving energy balance. Conversely, certain human conditions such as cachexia or cystic fibrosis are characterized by a negative energy balance from inadequate nutrition and/or increased energy expenditure, lowering survival and compromising quality of life. A long-term goal of Dr. Yoon’s research program is to develop new therapeutic agents for human disorders associated with abnormally regulated energy balance. A related area of interest is the contribution of mitochondrial defects and inflammatory processes to the development of metabolic disease.


Endocrinology, Diabetes, and Metabolism

Center/Program Affiliation

UC Davis Medical Group

Undergraduate School

A.B., Harvard University, Cambridge MA 1990

Medical School

M.D., Harvard Medical School, Boston MA 2002

Other School

Ph.D., Harvard Graduate School, Boston MA 2002


Internal Medicine, New York Presbyterian Hospital, New York NY 2002-2003


Internal Medicine, New York Presbyterian Hospital, New York NY 2003-2004


Genetics, Brigham and Women's Hospital, Boston MA 2007-2009


Endocrinology, Massachusetts General Hospital, Boston MA 2004-2007

Damon Runyon Cancer Research Foundation Fellow, 2007

Leon Reznick Prize for Excellence in Research, Harvard Medical School, 2002

Choi KM, Ryan KK, Yoon JC. Adipose Mitochondrial Complex I Deficiency Modulates Inflammation and Glucose Homeostasis in a Sex-Dependent Manner. Endocrinology. 2022 Apr 1;163(4):bqac018. doi:10.1210/endocr/bqac018. PMID:35171275.

Choi KM, Kim JH, Kong X, Isik M, Zhang J, Lim HW, Yoon JC. Defective brown adipose tissue thermogenesis and impaired glucose metabolism in mice lacking Letmd1. Cell Rep. 2021 Dec 14;37(11):110104. doi:10.1016/j.celrep.2021.110104. PMID:34910916.

Litvin M, Yoon JC, Leey Casella J, Blackman SM, Brennan AL. Energy balance and obesity in individuals with cystic fibrosis. J Cyst Fibros. 2019 Oct;18 Suppl 2:S38-S47. doi:10.1016/j.jcf.2019.08.015. PMID:31679728.

Yoon JC. Evolving Mechanistic Views and Emerging Therapeutic Strategies for Cystic Fibrosis-Related Diabetes. J Endocr Soc. 2017 Oct 30;1(11):1386-1400. doi:10.1210/js.2017-00362. PMID:29264462.

Yoon JC, Ling AJ, Isik M, Lee DY, Steinbaugh MJ, Sack LM, Boduch AN, Blackwell TK, Sinclair DA, Elledge SJ. GLTSCR2/PICT1 links mitochondrial stress and Myc signaling. Proc Natl Acad Sci U S A. 2014 Mar 11;111(10):3781-6. doi:10.1073/pnas.1400705111. Epub 2014 Feb 20. PMID:24556985.

Davoli T, Xu AW, Mengwasser KE, Sack LM, Yoon JC, Park PJ, Elledge SJ. Cumulative haploinsufficiency and triplosensitivity drive aneuploidy patterns and shape the cancer genome. Cell. 2013 Nov 7;155(4):948-62. doi:10.1016/j.cell.2013.10.011. Epub 2013 Oct 31. PMID:24183448.

Yoon JC, Ng A, Kim BH, Bianco A, Xavier RJ, Elledge SJ. Wnt signaling regulates mitochondrial physiology and insulin sensitivity. Genes Dev. 2010 Jul 15;24(14):1507-18. doi:10.1101/gad.1924910. PMID:20634317.

Puigserver P, Rhee J, Donovan J, Walkey CJ, Yoon JC, Oriente F, Kitamura Y, Altomonte J, Dong H, Accili D, Spiegelman BM. Insulin-regulated hepatic gluconeogenesis through FOXO1-PGC-1alpha interaction. Nature. 2003 May 29;423(6939):550-5. doi:10.1038/nature01667. Epub 2003 May 18. PMID:12754525.

Yoon JC, Puigserver P, Chen G, Donovan J, Wu Z, Rhee J, Adelmant G, Stafford J, Kahn CR, Granner DK, Newgard CB, Spiegelman BM. Control of hepatic gluconeogenesis through the transcriptional coactivator PGC-1. Nature. 2001 Sep 13;413(6852):131-8. doi:10.1038/35093050. PMID:11557972.