Antibiotic Resistance in Environmental Microbiomes: Molecular Mechanisms, Implications and Mitigation Strategies

Abstract

The ambient microbiome serves as a crucial reservoir for antibiotic resistance genes (ARGs), acting as a catalyst for their evolution and a pathway for global distribution. The discharge of antibiotic resistance genes (ARGs) from clinical and agricultural environments into ecosystems through wastewater, soil, and aquatic systems diminishes antimicrobial effectiveness and poses a significant One Health concern. This study consolidates existing knowledge about the emergence, persistence, and fate of antibiotic resistance genes in environmental compartments. It elucidates the molecular underpinnings of resistance, including horizontal gene transfer, efflux pumps, and enzymatic drug inactivation. It identifies significant ecological reservoirs, such as wastewater treatment facilities and manure-amended soils. The study assesses sophisticated molecular detection and surveillance technologies, ranging from droplet digital PCR to metagenomic sequencing, crucial for delineating the ambient resistome. The connections between environmental ARGs and human health hazards are outlined, with emphasis on exposure pathways and the growing clinical burden. Moreover, the research evaluates a range of mitigation and remediation measures designed to disrupt the resistance cycle. This includes engineered wastewater and potable water treatments, soil bioremediation via Verm remediation, and manure management, as well as innovative medicinal methods such as phage therapy, CRISPR-mediated gene editing, and fecal microbiota transplantation. This synthesis underscores the critical need for coordinated surveillance and targeted interventions within a comprehensive One Health framework to prevent the environmental spread of antibiotic resistance and safeguard public health.