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Article Dans Une Revue Science Translational Medicine Année : 2018

Microbial ecology perturbation in human IgA deficiency

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Nicolas Pons
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Emmanuelle Le Chatelier
Florence Levenez
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Sean Kennedy
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Marion Malphettes
Lionel Galicier
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Résumé

Paradoxically, loss of immunoglobulin A (IgA), one of the most abundant antibodies, does not irrevocably lead to severe infections in humans but rather is associated with relatively mild respiratory infections, atopy, and autoimmunity. IgA might therefore also play covert roles, not uniquely associated with control of pathogens. We show that human IgA deficiency is not associated with massive quantitative perturbations of gut microbial ecology. Metagenomic analysis highlights an expected pathobiont expansion but a less expected depletion in some typically beneficial symbionts. Gut colonization by species usually present in the oropharynx is also reminiscent of spatial microbiota disorganization. IgM only partially rescues IgA deficiency because not all typical IgA targets are efficiently bound by IgM in the intestinal lumen. Together, IgA appears to play a nonredundant role at the forefront of the immune/microbial interface, away from the intestinal barrier, ranging from pathobiont control and regulation of systemic inflammation to preservation of commensal diversity and community networks.
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Dates et versions

hal-01997107 , version 1 (07-07-2020)

Identifiants

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Jehane Fadlallah, Hela El Kafsi, Delphine Sterlin, Catherine Juste, Christophe Parizot, et al.. Microbial ecology perturbation in human IgA deficiency. Science Translational Medicine, 2018, 10 (439), pp.eaan1217. ⟨10.1126/scitranslmed.aan1217⟩. ⟨hal-01997107⟩
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