Nonribosomal Peptide Synthetase Specific Genome Amplification Using Rolling Circle Amplification for Targeted Gene...

Area of Science:

• Genomics and Molecular Biology
• Microbiology
• Biotechnology

Background:

• Next-generation sequencing provides vast genomic data but struggles with detecting rare species due to dominant ones.
• Sensitive amplification techniques are needed to selectively enrich target genes from complex microbial communities.
• Identifying novel genes, such as nonribosomal peptide synthetases (NRPS), is crucial for drug discovery and understanding microbial metabolism.

Purpose of the Study:

• To develop a highly sensitive and specific amplification technique for targeting bacterial genomes.
• To enable the detection and isolation of rare bacterial species and their specific genes from complex metagenomic samples.
• To apply the developed method for discovering novel NRPS sequences in sponge-associated bacteria.

Main Methods:

• Utilized rolling circle amplification (RCA) initiated by a single, gene-specific primer targeting nonribosomal peptide synthetase (NRPS).
• Tested the method using a mixed suspension of *Pseudomonas fluorescens* (target) and *Escherichia coli* (non-target).
• Applied the single-priming RCA technique to metagenomic DNA extracted from sponge-associated bacteria.

Main Results:

• The RCA reaction specifically amplified the *Pseudomonas fluorescens* genome, demonstrating high target specificity.
• Successful amplification of NRPS genes was achieved from as few as five target cells.
• The technique successfully identified NRPS sequences from an unknown sponge-associated bacterium in metagenomic samples.

Conclusions:

• Single-priming RCA is a sensitive and specific method for enriching target bacterial genomes using gene-specific primers.
• This technique effectively overcomes the limitations of dominant species in metagenomic analysis.
• The method provides a powerful tool for discovering species-specific genes, including NRPS, from unculturable and unknown bacteria.