Enhanced Extraction of Low-Molecular Weight DNA from Wastewater for Comprehensive Assessment of Antimicrobial Resistance

Jyotsna Karan; Sreya Mandal; Gulafsha Khan; Harshit Arya; Laasya Samhita

doi:10.3791/66899

Extracción mejorada de ADN de bajo peso molecular de aguas residuales para una evaluación integra...

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Enhanced Extraction of Low-Molecular Weight DNA from Wastewater for Comprehensive Assessment of Antimicrobial Resistance

Extracción mejorada de ADN de bajo peso molecular de aguas residuales para una evaluación integral de la resistencia a los antimicrobianos

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06:54 min

July 19, 2024

DOI: 10.3791/66899-v

Jyotsna Karan¹, Sreya Mandal¹, Gulafsha Khan¹, Harshit Arya¹, Laasya Samhita¹

¹Ashoka University

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Overview

This study develops a novel technique for assessing environmental antimicrobial resistance (AMR) by enriching low-molecular-weight extracellular DNA from wastewater samples. The protocol allows for the detection of genomic and horizontally transferred AMR genes, offering a cost-effective, kit-free method for environmental AMR tracking.

Key Study Components

Research Area

Antimicrobial resistance (AMR)
Environmental microbiology
Molecular genetics

Background

The evolution and transmission of antibiotic resistance in environmental settings
Current deficiencies in high yield extraction techniques of low molecular weight DNA
The importance of tracking AMR for public health

Methods Used

PCR and shotgun sequencing for microbial diversity profiling
Use of polyethylene glycol and sodium chloride for DNA extraction
Advanced AMR detection via metabar coding and gene-based panels

Main Results

Enhanced extraction of linear and low molecular weight DNA
Successful capture of both genomic and free DNA fractions associated with AMR
Foundational work for future developments in environmental AMR detection techniques

Conclusions

The study provides an efficient method for assessing environmental AMR
Promotes further research into both genetic and non-genetic factors contributing to antibiotic resistance

Frequently Asked Questions

What is the significance of low-molecular-weight extracellular DNA in AMR?

Low-molecular-weight extracellular DNA serves as a reservoir for AMR genes, thus its enrichment allows better detection and understanding of AMR dynamics.

How does this protocol enhance DNA extraction?

The protocol utilizes polyethylene glycol and sodium chloride to increase the yield of low molecular weight DNA during extraction from wastewater samples.

What are the applications of this research?

This research can help in monitoring trends in AMR, improving public health responses, and developing environmental policies.

What genetic mechanisms are being explored in relation to AMR?

The study compares contributions of horizontal gene transfer and genomic mutations to the development of antibiotic resistance.

Can this technique be developed for commercial use?

Yes, the protocol is designed to be cost-effective and potentially kit-free with further optimization.

How will the results impact future biological research?

This method opens avenues for more comprehensive studies on AMR in various environments, bridging gaps in genetic and environmental research.

What are the future directions for the authors' research?

Future studies will focus on expanding the database for tracking spatial-temporal variations in AMR and exploring non-genetic resistance mechanisms.

Aquí, presentamos una técnica simple para evaluar la resistencia a los antimicrobianos (RAM) ambiental mediante el aumento de la proporción de ADN extracelular de bajo peso molecular. El tratamiento previo con PEG al 20%-30% y NaCl 1,2 M permite la detección de genes de AMR tanto genómicos como transferidos horizontalmente. El protocolo se presta a un proceso sin kits con optimización adicional.

Estamos interesados en la evolución, la transmisión y los mecanismos moleculares que subyacen a la resistencia a los antibióticos. En concreto, el trabajo que alimenta este trabajo proviene de nuestro interés por la resistencia ambiental. Actualmente, estamos tratando de crear una base de datos local para rastrear la variación espacial temporal de la resistencia a los antimicrobianos utilizando datos de un año.

Se utiliza una combinación de técnicas basadas en cultivos y genómica para detectar y controlar la resistencia a los antimicrobianos. El ADN de las muestras se somete a PCR o secuenciación de escopeta para perfilar la diversidad microbiana y detectar genes de resistencia. Además, los códigos de metabarras y los paneles de AMR basados en genes se utilizan para la detección avanzada de AMR.

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