Mycobacterium tuberculosis genetic features associated with pulmonary tuberculosis severity
Résumé
Objective: Mycobacterium tuberculosis (Mtb) infections result in a wide spectrum of clinical presentations but without proven Mtb genetic determinants. Herein, we hypothesised that genetic features of Mtb clinical isolates, such as specific polymorphisms or micro-diversity, may be linked to tuberculosis (TB) severity.
Methods: 234 pulmonary TB patients (including 193 drug-susceptible and 14 mono-resistant cases diagnosed between 2017 and 2020 and 27 multidrug-resistant cases diagnosed between 2010 and 2020) were stratified according to TB disease severity and Mtb genetic features were explored using whole genome sequencing, including heterologous single nucleotide polymorphism (SNP) calling to explore micro-diversity. Finally, we performed a structural equation modelling (SEM) analysis to relate TB severity to Mtb genetic features.
Results: Clinical isolates from patients with mild TB carried mutations in genes associated with host-pathogen interaction, while those from patients with moderate/severe TB carried mutations associated with regulatory mechanisms. Genome-wide association study identified a SNP in the promoter of the gene coding for the virulence regulator EspR statistically associated with moderate/severe disease. SEM and model comparisons indicated that TB severity was associated with the detection of Mtb micro-diversity within clinical isolates and to the espR SNP.
Conclusions: Taken together, these results provide a new insight to better understand TB pathophysiology and could provide new prognosis tool for pulmonary TB severity.
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