Human immunodeficiency as a window to explore the integration of signalling and metabolic functions of STAT3

Prof. Dr. Stephan Ehl (CIBSS-AI), CCI Centre for Chronical Immunodeficiency (University Medical Center Freiburg, Faculty of Medicine)

CIBSS Profile page


Monogenetic diseases of the immune system provide unique insights into the function of the human immune system. Apart from increased susceptibility to infection, patients also frequently suffer from consequences of impaired immune regulation. Recently, germline gain-of-function STAT3 mutations have been associated with a syndrome of early-onset autoimmunity, T cell-mediated immunopathology and lymphoproliferation. We have identified more than 20 patients with STAT3 GOF associated disease, have cloned their mutations and expressed them in STAT3 deficient cell lines. The experimental characterization of these clinically relevant mutant STAT3 alleles offers a unique opportunity to understand how signalling and metabolic functions of STAT3 are integrated to determine the differentiation, function and life-span of human T cells. The cellular systems established in this project will also allow testing novel treatment approaches targeting the identified key functions of the canonical and non-canonical STAT3 pathway. Successful strategies can then be validated in primary patient cells and eventually in clinical studies.


Publications resulting from the project:

STAT3-confusion-of-function: beyond the loss and gain dualism.
Lodi L, Faletti LE, Maccari ME, Consonni F, Groß M, Pagnini I, Ricci S, Heeg M, Simonini G, Azzari C, Ehl S.
J Allergy Clin Immunol. 2022 doi: 10.1016/j.jaci.2022.06.007.

Germline STAT3 gain-of-function mutations in primary immunodeficiency: Impact on the cellular and clinical phenotype.
Faletti L, Ehl S, Heeg M.
Biomed J. 2021; doi: 10.1016/

Distinct molecular response patterns of activating STAT3 mutations associate with penetrance of lymphoproliferation and autoimmunity.
Jägle S, Heeg M, Grün S, Rensing-Ehl A, Maccari ME, Klemann C, Jones N, Lehmberg K, Bettoni C, Warnatz K, Grimbacher B, Biebl A, Schauer U, Hague R, Neth O, Mauracher A, Pachlopnik Schmid J, Fabre A, Kostyuchenko L, Führer M, Lorenz MR, Schwarz K, Rohr J, Ehl S.
Clin Immunol. 2020; doi: 10.1016/j.clim.2019.108316.