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A Lot on Your Plate? Well-to-Well Contamination as an Additional Confounder in Microbiome Sequence Analyses.

Authors
  • Walker, Alan W1
  • 1 Rowett Institute, University of Aberdeen, Aberdeen, United Kingdom [email protected] , (United Kingdom)
Type
Published Article
Journal
mSystems
Publication Date
Jun 25, 2019
Volume
4
Issue
4
Identifiers
DOI: 10.1128/mSystems.00362-19
PMID: 31239398
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

DNA sequence-based microbiome studies can be impacted by a range of different methodological artefacts. Contamination originating from laboratory kits and reagents can lead to erroneous results, particularly in samples containing a low microbial biomass. Minich and colleagues (mSystems 4:e00186-19, 2019, https://doi.org/10.1128/mSystems.00186-19) report on a different form of contamination, cross-contamination between samples that are processed together. They find that transfer of material between samples in 96-well plates is a common occurrence. The DNA extraction step, particularly when carried out automatedly, is identified as the major source of this contamination type. Well-to-well contamination distorts diversity measures, with low-biomass samples particularly affected. This report has important implications for attempts to decontaminate microbiome sequencing results. As contamination is derived from both external sources and crossover between samples, it is not appropriate to simply remove sequence variants that are detected in negative-control blanks, and more-nuanced decontamination approaches may be required. Copyright © 2019 Walker.

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