Isoniazid resistance without a loss of fitness in Mycobacterium tuberculosis.

Isoniazid resistance without a loss of fitness in Mycobacterium tuberculosis.
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DOI:
10.1038/ncomms1724
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发表时间:
2012-03-20
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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耐多药结核病和广泛耐药结核病(分别为耐多药结核病和广泛耐药结核病)的出现加剧了这一全球性疾病对公共卫生的严重影响。结核分枝杆菌(Mycobacterium tuberculosis,M.tb.)显示MDR和XDR表型的菌株在预测MDR-/XDR-TB流行是否将在人群中持续方面具有根本重要性。在这里,我们描述了一个潜在的机制,结核病。对结核病药物异烟肼的耐药性是由σ因子SigI的缺失引起的。我们证明,获得异烟肼耐药性的结核分枝杆菌。ΔsigI突变体可能不会降低生物体致病的适应性。当考虑耐药结核分枝杆菌的能力时,这些发现具有重要意义。由于SigI功能的丧失或改变可能在MDR和XDR M. tb的产生中发挥作用,因此,适合在社区环境中传播的菌株。
The emergence of multi- and extensively drug-resistant tuberculosis (MDR-TB and XDR-TB, respectively) has intensified the critical public health implications of this global disease. The fitness of Mycobacterium tuberculosis (M.tb.) strains exhibiting MDR and XDR phenotypes is of fundamental importance in predicting whether the MDR-/XDR-TB epidemic will be sustained across the human population. Here we describe a potential mechanism of M.tb. resistance to the TB drug isoniazid conferred by loss of a sigma factor, SigI. We demonstrate that the gain of isoniazid resistance in the M.tb. ΔsigI mutant might not diminish the organism’s fitness for causing disease. These findings have significant implications when considering the ability of drug resistant M.tb. strains to initiate untreatable TB epidemics, as it is possible that loss or alteration of SigI function could play a role in the generation of MDR and XDR M.tb. strains of suitable fitness to spread in a community setting.
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