NIBR
POSTDOCTORAL PROGRAM

Jan TchorzJan Tchorz, PhD
Chemical Biology & Therapeutics
Basel, Switzerland


Despite tremendous progress in developmental biology research over the past decade, it is still not well understood how developmental pathways orchestrate tissue regeneration from epithelial stem cells. Our group is focused on identifying signaling pathways, mechanisms and molecules regulating tissue stem cell activation and differentiation. The liver is well known for its unique potential to regenerate. We therefore study liver regeneration in mice and man to identify global players of regeneration and translate our findings into other tissues and eventually into therapeutic concepts. Our group utilizes a variety of genetic, biochemical, and high-throughput technologies to identify molecules and mechanisms that regulate this process in mammals. Tissue stem cell lineage tracing allows tracing of cells during regeneration and the identification of novel stem cell markers. Gain- and loss-of-function mutants are analysed to get mechanistic insights into tissue stem cell regulation and differentiation. Organoid-based ex vivo assays and other cellular models are used to study developmental pathways in vitro. Collaborations with our high-throughput technology group enable us to perform large-scale pathway genetic screens that reveal novel targets within individual pathways. Academic collaborations with the University Hospital Basel further allow the study of developmental pathways in patient samples and validation of our findings in man. Ultimately, we aim to identify molecules and biologics with therapeutic potential in regenerative medicine to treat diseases with high unmet medical need.

Selected Publications

The RSPO–LGR4/5–ZNRF3/RNF43 module controls liver zonation and size.
Planas-Paz L, Orsini V, Boulter L, Calabrese D, Pikiolek M, Nigsch F, Xie Y, Roma G, Donovan A, Marti P, Beckmann N, Dill MT, Carbone W, Bergling S, Isken A, Mueller M, Kinzel B, Yang Y, Mao X, Nicholson TB, Zamponi R, Capodieci P, Valdez R, Rivera D, Loew A, Ukomadu C, Terracciano LM, Bouwmeester T, Cong F, Heim MH, Forbes SJ, Ruffner H, Tchorz JS.
Nat Cell Biol. 2016 Apr 18. doi: 10.1038/ncb3337.

YAP promotes proliferation, chemoresistance, and angiogenesis in human cholangiocarcinoma through TEAD transcription factors.
Marti P, Stein C, Blumer T, Abraham Y, Dill MT, Pikiolek M, Orsini V, Jurisic G, Megel P, Makowska Z, Agarinis C, Tornillo L, Bouwmeester T, Ruffner H, Bauer A, Parker CN, Schmelzle T, Terracciano LM, Heim MH, Tchorz JS.
Hepatology. 2015 Nov;62(5):1497-510. doi: 10.1002/hep.27992.

Constitutive Notch2 signaling induces hepatic tumors in mice.
Dill MT, Tornillo L, Fritzius T, Terracciano L, Semela D, Bettler B, Heim MH, Tchorz JS.
Hepatology. 2013 Apr;57(4):1607-19. doi: 10.1002/hep.26165.

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