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Published on: May 2, 2018
Gut microbial dysbiosis, IgA, and Enterococcus in common variable immunodeficiency with immune dysregulation
Roos-Marijn Berbers1,2, Fernanda L Paganelli1, Joris M van Montfrans3
1Department of Medical Microbiology, University Medical Center Utrecht and Utrecht University, Utrecht, the Netherlands.
Background:
Common variable immunodeficiency (CVID) is characterized by hypogammaglobulinemia and recurrent infections. Significant morbidity and mortality are caused by immune dysregulation complications (CVIDid), which affect around one-third of CVID patients and have a poorly understood etiology. Here, we investigate the hypothesis that gut microbial dysbiosis contributes to the inflammation underlying CVIDid.
Results:
Bacterial invasion of colonic crypts was observed in CVID (3/15) and X-linked agammaglobulinemia (XLA, 1/3), but not in healthy control (HC, 0/9) biopsies. Fecal gut microbiota was characterized using 16S rRNA-targeted amplicon sequencing. Increased bacterial load, decreased alpha diversity and distinct beta diversity were observed in CVIDid (n = 42) compared to HC (n = 48), and similar results were seen in CVID with IgA deficiency (n = 40) compared to HC. CVIDid and CVID-IgA showed enrichment of the genus Enterococcus, and in vitro studies confirmed the inflammatory potential of Enterococcus gallinarum and Enterococcus hirae in patient monocytes.
Conclusions:
This study further supports the hypothesis that a dysregulated gut microbiota, with IgA deficiency as an important driving factor, contributes to systemic inflammation in primary antibody deficiency, and introduces enterococci as potential pathobionts in CVIDid. Video Abstract.
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