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Published on: December 4, 2021
Metatranscriptomic array analysis of 'Candidatus Accumulibacter phosphatis'-enriched enhanced biological phosphorus
Shaomei He1, Victor Kunin, Matthew Haynes
1Department of Civil and Environmental Engineering, University of Wisconsin at Madison, Madison, WI 53706, USA.
Environmental Microbiology
|February 13, 2010
Summary
This study reveals gene expression in enhanced biological phosphorus removal (EBPR) sludge, identifying key metabolic pathways and gene regulation in 'Candidatus Accumulibacter'. Findings support EBPR models for efficient nutrient removal.
Area of Science:
- Environmental microbiology
- Metagenomics and transcriptomics
- Wastewater treatment technologies
Background:
- Enhanced biological phosphorus removal (EBPR) is crucial for wastewater treatment.
- Understanding microbial gene expression in EBPR is vital for process optimization.
- 'Candidatus Accumulibacter' is a key genus involved in EBPR.
Purpose of the Study:
- To perform the first metatranscriptomic analysis of 'Candidatus Accumulibacter' in EBPR sludge.
- To investigate gene expression patterns during anaerobic and aerobic phases.
- To identify genes involved in carbon and phosphate metabolism and regulation.
Main Methods:
- Metatranscriptomic analysis using medium density oligonucleotide microarrays.
- Targeting genes crucial for the EBPR phenotype.
- RNA sample collection at early anaerobic and aerobic stages.
Main Results:
- Detected expression of genes involved in polyhydroxyalkanoate synthesis, TCA cycle, and polyphosphate formation.
- Most gene expression levels were similar between anaerobic and aerobic phases.
- Aerobic upregulation of genes for transcription, translation, protein translocation, TCA cycle, and ATP synthesis observed.
- Nitrous oxide reductase upregulated in anaerobic conditions, suggesting oxygen-deprivation induction.
Conclusions:
- Findings support EBPR metabolic models, indicating stored carbon polymer oxidation fuels aerobic growth.
- Gene expression patterns provide insights into 'Candidatus Accumulibacter' regulation during EBPR.
- Novel genes discovered through metagenomic analysis expand understanding of EBPR microbial communities.
