ArticleEuropean journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology2026
Deciphering the different Mycobacterium avium complex infections of HIV and non-HIV patients by bacterial GWAS and immune cells flow cytometry.
Article in European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposePulmonary diseases caused by Mycobacterium avium complex (MAC) show species-specific epidemiology: M. avium predominates in HIV-positive patients, while M. intracellulare mainly affects immunocompetent hosts. This study aimed to elucidate the bacterial and host mechanisms underlying these differences.
methodsWe integrated clinical metagenomic next-generation sequencing (mNGS), k-mer-based bacterial genome-wide association study (GWAS) of clinical isolates, peripheral blood immunophenotyping of 175 patients, and mouse infection models with or without CD4 depletion.
resultsK-mer GWAS identified lipid metabolism and transport genes (notably mce) enriched in isolates from hosts with different HIV statuses. Immunophenotyping showed that in HIV-negative patients, M. intracellulare infection elicited higher NKT cell frequencies than M. avium, a difference absent in HIV-positive hosts. In mice, anti-CD4
conclusionMAC species exhibit fundamentally divergent infection dynamics driven by differential NKT cell activation, likely shaped by species-specific lipid antigens. This lipid-NKT axis explains contrasting clinical patterns of M. avium and M. intracellulare and highlights a potential target for host-directed interventions.
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