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B cells have important functions in gut homeostasis, and dysregulated B cell populations are frequently observed in patients with inflammatory bowel diseases, including both ulcerative colitis (UC) and Crohn's disease (CD). How these B cell perturbations contribute to disease remains largely unknown. Here, we perform deep sequencing of the B cell receptor (BCR) repertoire in four cohorts of patients with CD, together with healthy controls and patients with UC. We identify BCR clones that are shared between patients with CD but not found in healthy individuals nor in patients with UC, indicating CD-associated B cell immune responses. Shared clones are present in the inflamed gut mucosa, draining intestinal lymph nodes and blood, suggesting the presence of common CD-associated antigens that drive B cell responses in CD patients.

Original publication

DOI

10.1038/s41467-025-58977-y

Type

Journal article

Journal

Nature communications

Publication Date

04/2025

Volume

16

Addresses

Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK. pk488@cam.ac.uk.

Keywords

Intestinal Mucosa, Lymph Nodes, B-Lymphocytes, Clone Cells, Humans, Colitis, Ulcerative, Crohn Disease, Receptors, Antigen, B-Cell, Case-Control Studies, Adult, Middle Aged, Female, Male, High-Throughput Nucleotide Sequencing