Origins and clonal convergence of gastrointestinal IgE+ B cells in human peanut allergy. Science immunology Hoh, R. A., Joshi, S. A., Lee, J. Y., Martin, B. A., Varma, S., Kwok, S., Nielsen, S. C., Nejad, P., Haraguchi, E., Dixit, P. S., Shutthanandan, S. V., Roskin, K. M., Zhang, W., Tupa, D., Bunning, B. J., Manohar, M., Tibshirani, R., Fernandez-Becker, N. Q., Kambham, N., West, R. B., Hamilton, R. G., Tsai, M., Galli, S. J., Chinthrajah, R. S., Nadeau, K. C., Boyd, S. D. 2020; 5 (45)


B cells in human food allergy have been studied predominantly in the blood. Little is known about IgE+ B cells or plasma cells in tissues exposed to dietary antigens. We characterized IgE+ clones in blood, stomach, duodenum, and esophagus of 19 peanut-allergic patients, using high-throughput DNA sequencing. IgE+ cells in allergic patients are enriched in stomach and duodenum, and have a plasma cell phenotype. Clonally related IgE+ and non-IgE-expressing cell frequencies in tissues suggest local isotype switching, including transitions between IgA and IgE isotypes. Highly similar antibody sequences specific for peanut allergen Ara h 2 are shared between patients, indicating that common immunoglobulin genetic rearrangements may contribute to pathogenesis. These data define the gastrointestinal tract as a reservoir of IgE+ B lineage cells in food allergy.

View details for DOI 10.1126/sciimmunol.aay4209

View details for PubMedID 32139586