Jeffrey David Roizen, M.D., Ph.D.

Assistant Professor of Pediatrics (Endocrinology and Diabetes) at the Children's Hospital of Philadelphia
Department: Pediatrics
Contact information
Children's Hospital of Philadelphia
Division of Endocrinology and Diabetes
3401 Civic Center Blvd.
Philadelphia, PA 19104
Division of Endocrinology and Diabetes
3401 Civic Center Blvd.
Philadelphia, PA 19104
Office: 215-590-3174
Fax: 215-590-3053
Lab: 267 678 3597
Fax: 215-590-3053
Lab: 267 678 3597
Email:
jeffroizen@gmail.com
jeffroizen@gmail.com
Publications
Links
Search PubMed for articles
lab website
CHOP faculty page
Perelman Faculty Web Page
Google Scholar Page
Search PubMed for articles
lab website
CHOP faculty page
Perelman Faculty Web Page
Google Scholar Page
Education:
BA (Chemistry and Biology)
Williams College, Williamstown, MA, 2000.
MD
Washington University School of Medicine, St. Louis, MO, 2008.
PhD (Molecular and Cell Biology)
Washington University School of Medicine, St. Louis, MO, 2008.
Permanent linkBA (Chemistry and Biology)
Williams College, Williamstown, MA, 2000.
MD
Washington University School of Medicine, St. Louis, MO, 2008.
PhD (Molecular and Cell Biology)
Washington University School of Medicine, St. Louis, MO, 2008.
Description of Research Expertise
The goal of our laboratory is to understand non-calciometabolic effects of vitamin D and to exploit this understanding to design new therapeutic approaches to common diseases such as sarcopenia and obesity. Towards this goal we use large human data sets and mouse physiology combined with high throughput sequencing to drive questions in mouse models of disease and cell culture and results from unbiased screening in cell culture to drive test-of-principle experiments and trials in mice and humans. Additionally, we rely on core principles of improv (“LISTEN” (to your collagues and to the data), say “yes, and…” (if you encounter a fact that doesn’t fit your theory, follow the fact), “find the game” (what is interesting, can you set up your Qs so that any answer is interesting), “If this is true, then what else is true…” (if you find something interesting, does it imply other interesting things), “there are no mistakes” (for well designed experiments, there are no failures)) to drive our science.Selected Publications
Nguyen, M., Roizen, J: 25(OH)D and not 1,25(OH)D is responsible for high-dose dietary vitamin D benefits in muscle. PAS Meeting, Honolulu, HI, United States. E-PAS 2025 Page: 1982764, May 2025.Levine MA, Li D, Roizen J, Weber D.: Letter to the editor regarding Duan et al, "CYP4A22 loss-of-function causes a new type of vitamin D-dependent rickets (VDDR1C)" J Bone Miner Res 40: 445-446, Mar 2025.
Roizen J, Long C, Casella A, Nguyen M, Danahy L, Seiler C, Lei M, Mark J.: High dose dietary vitamin D allocates surplus calories to muscle and growth instead of fat via modulation of myostatin and leptin signaling. Res Sq May 2024.
Roizen, JD and Levine, MA: The role of genetic variation in CYP2R1, the principal vitamin D 25-hydroxylase, and CYP3A4 in vitamin D homeostasis. Feldman and Pike's Vitamin D. Feldman and Pike (eds.). Academic Press, Page: 341-357, Jan 2024.
McCormack SE, Wang Z, Wade KL, Dedio A, Cilenti N, Crowley J, Plessow F, Bamba V, Roizen JD, Jiang Y, Stylli J, Ramakrishnan A, Platt ML, Shekdar K, Fisher MJ, Vetter VL, Hocking M, Xiao R, Lawson EA.: A Pilot Randomized Clinical Trial of Intranasal Oxytocin to Promote Weight Loss in Individuals With Hypothalamic Obesity. J Endocr Soc 7(1): bvad037, Mar 2023.
Qu HQ, Qu J, Glessner J, Liu Y, Mentch F, Chang X, March M, Li J, Roizen JD, Connolly JJ, Sleiman P, Hakonarson H.: Improved genetic risk scoring algorithm for type 1 diabetes prediction. Pediatr Diabetes 23(3): 320-323, May 2022.
Qu HQ, Qu J, Bradfield J, Glessner J, Chang X, March M, Mentch FD, Roizen JD, Connolly JJ, Sleiman P, Hakonarson H.: Combined Application of Genetic and Polygenic Risk Score for Type 1 Diabetes Risk Prediction. Diabetes Obes Metab 23(8): 2001-2003, Aug 2021.
Qu J, Qu HQ, Bradfield JP, Glessner JT, Chang X, Tian L, March M, Connolly JJ, Roizen JD, Sleiman PMA, Hakonarson H.: Insights into non-autoimmune type 1 diabetes with 13 novel loci in low polygenic risk score patients. Sci Rep 11(1): 16013, Aug 2021.
Mancilla EE, Zielonka B, Roizen JD, Dodds KM, Rand EB, Heimall JR, Chen F, Wu C, Goldberg DJ, Rychik J.: Growth in Children with a Fontan Circulation. J Pediatr 235(1): 149-155, Aug 2021.
Qu HQ, Qu J, Bradfield J, Marchand L, Glessner J, Chang X, March M, Li J, Connolly JJ, Roizen JD, Sleiman P, Polychronakos C, Hakonarson H.: Genetic architecture of type 1 diabetes with low genetic risk score informed by 41 unreported loci. Commun Biol 4(1): 908, Jul 2021.