Multiple intestinal atresia (MIA) is a rare cause of bowel obstruction that is sometimes associated with a combined immunodeficiency (CID), leading to increased susceptibility to infections. The factors underlying this rare disease are poorly understood. We characterized the immunological and intestinal features of 6 unrelated MIA-CID patients. All patients displayed a profound, generalized lymphocytopenia, with few lymphocytes present in the lymph nodes. The thymus was hypoplastic and exhibited an abnormal distribution of epithelial cells. Patients also had profound disruption of the epithelial barrier along the entire gastrointestinal tract. Using linkage analysis and whole-exome sequencing, we identified 10 mutations in tetratricopeptide repeat domain–7A (
Amélie E. Bigorgne, Henner F. Farin, Roxane Lemoine, Nizar Mahlaoui, Nathalie Lambert, Marine Gil, Ansgar Schulz, Pierre Philippet, Patrick Schlesser, Tore G. Abrahamsen, Knut Oymar, E. Graham Davies, Christian Lycke Ellingsen, Emmanuelle Leteurtre, Brigitte Moreau-Massart, Dominique Berrebi, Christine Bole-Feysot, Patrick Nischke, Nicole Brousse, Alain Fischer, Hans Clevers, Geneviève de Saint Basile
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