Xavier, Ramnik

Phone: 617-643-3331


Ramnik Xavier is the Kurt Isselbacher Professor of Medicine at Harvard Medical School and the Chief of Gastroenterology at the Massachusetts General Hospital. He is Board Certified in Medicine and Gastroenterology. Ramnik is also the Director of the Center for the Study of Inflammatory Bowel Disease (CSIBD) and a Senior Associate Member of the Broad Institute of MIT and Harvard. Ramnik is clinically active, teaching medical students, residents in medicine, and gastroenterology fellows rotating through the MGH.

Following his clinical training, he completed a postdoctoral fellowship with Professor Brian Seed in the Department of Molecular Biology at MGH and the Department of Genetics at the Harvard Medical School. The overall goal in the laboratory is to discover and understand the function of important mediators and effectors involved in innate (autophagy, pathogen-containing vacuole) and adaptive (T cell activation) immunity. Of particular interest are the cellular components and regulatory networks, which interact dynamically within temporal, spatial and pathophysiological contexts of innate and adaptive immunity. The lab is pursuing integrative systems approaches that closely couple genome-wide experimentation with high-throughput assays and computational methods.

A second area of focus is to examine the pathway defects associated with genetic variants in IBD/T1D and identify novel small molecules that interrupt signal transduction pathways associated with disease risk.

Selected Publications (from total of 221)


Paulus GL, Xavier RJ
Autophagy and checkpoints for intracellular pathogen defense.
Curr Opin Gastroenterol. 2014;:ePub - PMID: 25394238
Buffen K, Oosting M, Quintin J, Ng A, Kleinnijenhuis J, Kumar V, van de Vosse E, Wijmenga C, van Crevel R, Oosterwijk E, Grotenhuis AJ, Vermeulen SH, Kiemeney LA, van de Veerdonk FL, Chamilos G, Xavier RJ, van der Meer JW, Netea MG, Joosten LA
Autophagy Controls BCG-Induced Trained Immunity and the Response to Intravesical BCG Therapy for Bladder Cancer.
PLoS Pathog. 2014;10(10):e1004485 - PMID: 25356988 - PMCID: PMC4214925
Liao J, Jijon HB, Kim IR, Goel G, Doan A, Sokol H, Bauer H, Herrmann BG, Lassen KG, Xavier RJ
An Image-Based Genetic Assay Identifies Genes in T1D Susceptibility Loci Controlling Cellular Antiviral Immunity in Mouse.
PLoS One. 2014;9(9):e108777 - PMID: 25268627 - PMCID: PMC4182575
Platt RJ, Chen S, Zhou Y, Yim MJ, Swiech L, Kempton HR, Dahlman JE, Parnas O, Eisenhaure TM, Jovanovic M, Graham DB, Jhunjhunwala S, Heidenreich M, Xavier RJ, Langer R, Anderson DG, Hacohen N, Regev A, Feng G, Sharp PA, Zhang F
CRISPR-Cas9 Knockin Mice for Genome Editing and Cancer Modeling.
Cell. 2014;159(2):440-55 - PMID: 25263330
Draberova L, Bugajev V, Potuckova L, Halova I, Bambouskova M, Polakovicova I, Xavier RJ, Seed B, Draber P
Transmembrane adaptor protein PAG/CBP is involved in both positive and negative regulation of mast cell signaling.
Mol Cell Biol. 2014;34(23):4285-300 - PMID: 25246632
Sundberg TB, Xavier RJ, Schreiber SL, Shamji AF
Small-molecule control of cytokine function: new opportunities for treating immune disorders.
Curr Opin Chem Biol. 2014;23C:23-30 - PMID: 25222143
Kumar V, Cheng SC, Johnson MD, Smeekens SP, Wojtowicz A, Giamarellos-Bourboulis E, Karjalainen J, Franke L, Withoff S, Plantinga TS, van de Veerdonk FL, van der Meer JW, Joosten LA, Sokol H, Bauer H, Herrmann BG, Bochud PY, Marchetti O, Perfect JR, Xavier RJ, Kullberg BJ, Wijmenga C, Netea MG
Immunochip SNP array identifies novel genetic variants conferring susceptibility to candidaemia.
Nat Commun. 2014;5:4675 - PMID: 25197941
Doench JG, Hartenian E, Graham DB, Tothova Z, Hegde M, Smith I, Sullender M, Ebert BL, Xavier RJ, Root DE
Rational design of highly active sgRNAs for CRISPR-Cas9-mediated gene inactivation.
Nat Biotechnol. 2014;:ePub - PMID: 25184501
Saeed S, Quintin J, Kerstens HH, Rao NA, Aghajanirefah A, Matarese F, Cheng SC, Ratter J, Berentsen K, van der Ent MA, Sharifi N, Janssen-Megens EM, Ter Huurne M, Mandoli A, van Schaik T, Ng A, Burden F, Downes K, Frontini M, Kumar V, Giamarellos-Bourboulis EJ, Ouwehand WH, van der Meer JW, Joosten LA, Wijmenga C, Martens JH, Xavier RJ, Logie C, Netea MG, Stunnenberg HG
Epigenetic programming of monocyte-to-macrophage differentiation and trained innate immunity.
Science. 2014;345(6204):1251086 - PMID: 25258085
Cheng SC, Quintin J, Cramer RA, Shepardson KM, Saeed S, Kumar V, Giamarellos-Bourboulis EJ, Martens JH, Rao NA, Aghajanirefah A, Manjeri GR, Li Y, Ifrim DC, Arts RJ, van der Meer BM, Deen PM, Logie C, O'Neill LA, Willems P, van de Veerdonk FL, van der Meer JW, Ng A, Joosten LA, Wijmenga C, Stunnenberg HG, Xavier RJ, Netea MG
mTOR- and HIF-1?-mediated aerobic glycolysis as metabolic basis for trained immunity.
Science. 2014;345(6204):1250684 - PMID: 25258083 - PMCID: PMC4226238
Goel G, Conway KL, Jaeger M, Netea MG, Xavier RJ
Multivariate inference of pathway activity in host immunity and response to therapeutics.
Nucleic Acids Res. 2014;42(16):10288-306 - PMID: 25147207
Lassen KG, Xavier RJ
An alteration in ATG16L1 stability in Crohn disease.
Autophagy. 2014;10(10):1858-1860 - PMID: 25136803 - PMCID: PMC4198368
Sundberg TB, Choi HG, Song JH, Russell CN, Hussain MM, Graham DB, Khor B, Gagnon J, O'Connell DJ, Narayan K, Dan?ík V, Perez JR, Reinecker HC, Gray NS, Schreiber SL, Xavier RJ, Shamji AF
Small-molecule screening identifies inhibition of salt-inducible kinases as a therapeutic strategy to enhance immunoregulatory functions of dendritic cells.
Proc Natl Acad Sci U S A. 2014;111(34):12468-12473 - PMID: 25114223 - PMCID: PMC4151730
Haberman Y, Tickle TL, Dexheimer PJ, Kim MO, Tang D, Karns R, Baldassano RN, Noe JD, Rosh J, Markowitz J, Heyman MB, Griffiths AM, Crandall WV, Mack DR, Baker SS, Huttenhower C, Keljo DJ, Hyams JS, Kugathasan S, Walters TD, Aronow B, Xavier RJ, Gevers D, Denson LA
Pediatric Crohn disease patients exhibit specific ileal transcriptome and microbiome signature.
J Clin Invest. 2014;124(8):3617-33 - PMID: 25003194 - PMCID: PMC4109533
Wei SC, Tan YY, Weng MT, Lai LC, Hsiao JH, Chuang EY, Shun CT, Wu DC, Kao AW, Chuang CS, Ni YH, Shieh MJ, Tung CC, Chen Y, Wang CY, Xavier RJ, Podolsky DK, Wong JM
SLCO3A1, a Novel Crohn's Disease-Associated Gene, Regulates NF-?B Activity and Associates with Intestinal Perforation.
PLoS One. 2014;9(6):e100515 - PMID: 24945726 - PMCID: PMC4063938