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A new molecular approach based on qPCR for the quantification of fecal bacteria in contaminated marine sediments.

Abstract：

:Harbour sediments are periodically subjected to dredging operations and their management is mainly based on the assessment of the chemical contamination levels, but the potential risks posed by the presence of pathogenic microorganisms have been largely neglected. Here we first developed new molecular protocols based on the use of Real Time Quantitative PCR (qPCR), targeting both bacterial DNA and the transcription product (rRNA), for the identification and quantification of bacteria of fecal origin (Escherichia coli, Enterococcus spp. and Salmonella spp.) in contaminated harbour sediments. Then, we assessed the effects of bioremediation treatments, conventionally utilized for abating the hydrocarbon contamination in the sediment, on the abundance of fecal bacteria (FB). The qPCR technique was highly specific, sensitive and reproducible, and detected a number of fecal bacteria significantly higher than the classical cultivation techniques. Sediments subjected to bioremediation experiments by biostimulation with inorganic nutrients at different temperatures displayed a significant increase of the abundance of E. coli and Enterococcus spp. These findings suggest the risk of a potential increase of the contamination by pathogenic microorganisms of fecal origin during bioremediation and, as such, highlight the importance of careful monitoring this biological component in harbour sediments when subjected to bio-treatments.

journal_name

J Biotechnol

journal_title

Journal of biotechnology

authors

Luna GM,Dell'Anno A,Pietrangeli B,Danovaro R

doi

10.1016/j.jbiotec.2011.07.033

subject

Has Abstract

pub_date

2012-02-20 00:00:00

pages

446-53

issue

4

eissn

0168-1656

issn

1873-4863

pii

S0168-1656(11)00423-8

journal_volume

157

pub_type

杂志文章

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