Microbial ecology perturbation in human IgA deficiency

作者：Fadlallah, Jehane; El Kafsi, Hela; Sterlin, Delphine; Juste, Catherine; Parizot, Christophe; Dorgham, Karim; Autaa, Gaelle; Gouas, Doriane; Almeida, Mathieu; Lepage, Patricia; Pons, Nicolas; Le Chatelier, Emmanuelle; Levenez, Florence; Kennedy, Sean; Galleron, Nathalie; de Barros, Jean-Paul Pais; Malphettes, Marion; Galicier, Lionel; Boutboul, David; Mathian, Alexis; Miyara, Makoto; Oksenhendler, Eric; Amoura, Zahir; Dore, Joel; Fieschi, Claire; Ehrlich, S. Dusko; Larsen, Martin^*

来源：Science Translational Medicine, 2018, 10(439): eaan1217.

DOI：10.1126/scitranslmed.aan1217

• HUMAN GUT MICROBIOME
• MEMORY B-CELLS
• IMMUNOGLOBULIN-A
• T-CELLS
• SECRETORY ANTIBODIES
• BACTERIA
• HOMEOSTASIS
• INNATE
• LIPOPOLYSACCHARIDE
• COLONIZATION

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.

• 出版日期2018-5-2
• 单位上海生物信息技术研究中心