Current status of marker genes of Bacteroides and related taxa for identifying sewage pollution in environmental waters

Ahmed, Warish, Hughes, Bridie and Harwood, Valerie J. (2016) Current status of marker genes of Bacteroides and related taxa for identifying sewage pollution in environmental waters. Water, 8 6: . doi:10.3390/w8060231


Author Ahmed, Warish
Hughes, Bridie
Harwood, Valerie J.
Title Current status of marker genes of Bacteroides and related taxa for identifying sewage pollution in environmental waters
Formatted title
Current status of marker genes of Bacteroides and related taxa for identifying sewage pollution in environmental waters
Journal name Water   Check publisher's open access policy
ISSN 2073-4441
Publication date 2016-05-31
Year available 2016
Sub-type Critical review of research, literature review, critical commentary
DOI 10.3390/w8060231
Open Access Status DOI
Volume 8
Issue 6
Total pages 27
Place of publication Basel, Switzerland
Publisher MDPI AG
Collection year 2017
Language eng
Formatted abstract
Microbial source tracking (MST) endeavors to determine sources of fecal pollution in environmental waters by capitalizing on the association of certain microorganisms with the gastrointestinal tract and feces of specific animal groups. Several decades of research have shown that bacteria belonging to the gut-associated order Bacteroidales, and particularly the genus Bacteroides, tend to co-evolve with the host, and are, therefore, particularly suitable candidates for MST applications. This review summarizes the current research on MST methods that employ genes belonging to Bacteroidales/Bacteroides as tracers or “markers” of sewage pollution, including known advantages and deficiencies of the many polymerase chain reaction (PCR)-based methods that have been published since 2000. Host specificity is a paramount criterion for confidence that detection of a marker is a true indicator of the target host. Host sensitivity, or the prevalence of the marker in feces/waste from the target host, is necessary for confidence that absence of the marker is indicative of the absence of the pollution source. Each of these parameters can vary widely depending on the type of waste assessed and the geographic location. Differential decay characteristics of bacterial targets and their associated DNA contribute to challenges in interpreting MST results in the context of human health risks. The HF183 marker, derived from the 16S rRNA gene of Bacteroides dorei and closely related taxa, has been used for almost two decades in MST studies, and is well characterized regarding host sensitivity and specificity, and in prevalence and concentration in sewage in many countries. Other markers such as HumM2 and HumM3 show promise, but require further performance testing to demonstrate their widespread utility. An important limitation of the one-marker-one-assay approach commonly used for MST is that given the complexities of microbial persistence in environmental waters, and the methodological challenges of quantitative PCR (qPCR) in such samples, the absence of a given marker does not ensure the absence of fecal pollution in the source water. Approaches under development, such as microarray and community analysis, have the potential to improve MST practices, thereby increasing our ability to protect human and ecosystem health.
Keyword Microbial source tracking
Bacteroides
Fecal pollution
Fecal indicator bacteria
Wastewater
Water quality
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
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