Marcus Clark

Marcus Clark is a Professor of Medicine at the University of Chicago's Pritzker School of Medicine, where he leads a research laboratory focused on B cell biology and autoimmunity. His work spans fundamental immunological mechanisms and translational applications in autoimmune diseases, particularly lupus nephritis.

Dr. Clark's research centers on B cell antigen receptor (BCR) signaling and its role in cell fate decisions. In the bone marrow, his laboratory discovered the epigenetic reader BRWD1 as a critical regulator of immunoglobulin light chain gene recombination during B lymphopoiesis. More recently, his team demonstrated that the pre-BCR initiates an IRF4-CXCR4 feedforward loop that directly signals Ig-kappa recombination, fundamentally revising the canonical model of B cell development. In peripheral tissues, Dr. Clark has reshaped understanding of germinal center biology by identifying novel B cell populations within the dark zone that enable compartmentalization of core functions.

His laboratory has developed innovative approaches combining deep machine learning with single-cell technologies to study in situ adaptive immune responses in human lupus nephritis. This bioinformatics platform achieves sensitivity and specificity approaching two-photon excitation microscopy while being applicable to human disease studies. Analysis of his 15 most recent publications reveals a consistent focus on B cell development mechanisms, germinal center organization, and translational applications in autoimmune kidney disease, with increasing integration of computational methods and single-cell technologies over time.

Dr. Clark maintains an exceptionally robust research program with multiple active NIH grants including R01AI187357 (2025-2029) on BRWD1-mediated cohesin conversion in B cell biology and R01AI180222 (2024-2029) on using artificial intelligence to bridge human and murine lupus nephritis studies. He serves as Principal Investigator on the University of Chicago Autoimmunity Center of Excellence (U19AI082724, 2009-2024) and the Medical Scientist National Research Service Award (T32GM150375, 2023-2028).

His laboratory has trained numerous researchers who have become prominent in the field, including Malay Mandal, Anthony Chang, and Kichul Ko. Dr. Clark's team has developed novel in vivo models and targeted in vitro studies that provide definitive insights into complex immunological processes, with particular emphasis on the molecular regulation of B cell development and function in health and autoimmune disease.