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Persistence of Transmitted HIV-1 Drug Resistance Mutations Associated with Fitness Costs and Viral Genetic Backgrounds


The evolution of resistance is a universal challenge in antimicrobial chemotherapy. A key driver of resistance is that drug resistance mutations often persist even in the absence of drugs and despite the fact that resistance mutations are often associated with reduced pathogen replication (“fitness costs”). Such persistence may occur because fitness costs are low, especially if they are compensated by additional mutations in their “genetic background”. Here we assessed the role of fitness-cost and the genetic background for resistance in a real-world epidemiological setting by studying the persistence behavior of transmitted antiretroviral resistance mutations of HIV. This persistence behavior was associated with the predicted fitness cost of a given resistance mutation in the particular genetic background in which it occurred. We found that persistence behavior varied strongly across both mutation types and genetic backgrounds and that persistence was significantly associated with predicted fitness costs. In particular we found that even mutations of the same type tended to persist longer if they occurred in a genetic background where they caused weak fitness costs. Overall our results underline the variability of persistence behavior as well as the important role of fitness costs and the genetic background in the evolution of antimicrobial resistance.


Vyšlo v časopise: Persistence of Transmitted HIV-1 Drug Resistance Mutations Associated with Fitness Costs and Viral Genetic Backgrounds. PLoS Pathog 11(3): e32767. doi:10.1371/journal.ppat.1004722
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004722

Souhrn

The evolution of resistance is a universal challenge in antimicrobial chemotherapy. A key driver of resistance is that drug resistance mutations often persist even in the absence of drugs and despite the fact that resistance mutations are often associated with reduced pathogen replication (“fitness costs”). Such persistence may occur because fitness costs are low, especially if they are compensated by additional mutations in their “genetic background”. Here we assessed the role of fitness-cost and the genetic background for resistance in a real-world epidemiological setting by studying the persistence behavior of transmitted antiretroviral resistance mutations of HIV. This persistence behavior was associated with the predicted fitness cost of a given resistance mutation in the particular genetic background in which it occurred. We found that persistence behavior varied strongly across both mutation types and genetic backgrounds and that persistence was significantly associated with predicted fitness costs. In particular we found that even mutations of the same type tended to persist longer if they occurred in a genetic background where they caused weak fitness costs. Overall our results underline the variability of persistence behavior as well as the important role of fitness costs and the genetic background in the evolution of antimicrobial resistance.


Zdroje

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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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