In Vivo Evolution of Drug-resistant Mycobacterium Tuberculosis in Patients During Long-term Treatment

Overview

Journal BMC Genomics

Publisher Biomed Central

Specialty Genetics

Date 2018 Aug 31

PMID 30157763

Citations 12

Authors

Yuhui Xu

Fei Liu

Suting Chen

Jiannan Wu

Yongfei Hu

Baoli Zhu

Zhaogang Sun

Affiliations

Soon will be listed here.

Abstract

Background: In the current scenario, the drug-resistant tuberculosis is a significant challenge in the control of tuberculosis worldwide. In order to investigate the in vivo evolution of drug-resistant M. tuberculosis, the present study envisaged sequencing of the draft genomes of 18 serial isolates from four pre-extensively drug-resistant (pre-XDR) tuberculosis patients for continuous genetic alterations.

Results: All of the isolates harbored single nucleotide polymorphisms (SNPs) ranging from 1303 to 1309 with M. tuberculosis H37Rv as the reference. SNPs ranged from 0 to 12 within patients. The evolution rates were higher than the reported SNPs of 0.5 in the four patients. All the isolates exhibited mutations at sites of known drug targets, while some contained mutations in uncertain drug targets including folC, proZ, and pyrG. The compensatory substitutions for rescuing these deleterious mutations during evolution were only found in RpoC I491T in one patient. Many loci with microheterogeneity showed transient mutations in different isolates. Ninety three SNPs exhibited significant association with refractory pre-XDR TB isolates.

Conclusions: Our results showed evolutionary changes in the serial genetic characteristics of the pre-XDR TB patients due to accumulation of the fixed drug-resistant related mutations, and the transient mutations under continuous antibiotics pressure over several years.

Citing Articles

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