Scalable genotyping of microbial colonies.

Area of Science:

• Microbiology
• Genomics
• Molecular Biology

Background:

• The 16S ribosomal RNA (rRNA) gene sequence is crucial for microbial genotyping and taxonomic identification.
• Sanger sequencing is cost-prohibitive for large-scale microbial isolate genotyping.
• High-throughput sequencing offers scalability but faces challenges in DNA purification and multiplex library preparation.

Purpose of the Study:

• To develop a scalable and cost-effective protocol for microbial isolate genotyping.
• To streamline high-throughput sequencing workflows for microbial identification.
• To enable efficient multiplexing and library preparation for large numbers of microbial samples.

Main Methods:

• Implementation of a colony polymerase chain reaction (PCR) with simple cell lysis.
• Development of a four-barcode indexing scheme for scalable multiplexing.
• Simultaneous amplification with four primers in a single reaction for streamlined library preparation.

Main Results:

• Successful application of the protocol to 93 microbial isolates from environmental samples.
• Achieved accurate identification of approximately 90% of microbial isolates.
• Demonstrated the scalability and efficiency of the developed genotyping protocol.

Conclusions:

• The developed protocol offers a scalable and cost-effective solution for microbial genotyping.
• The four-barcode indexing scheme facilitates streamlined library preparation and multiplexing.
• This method significantly enhances the feasibility of high-throughput microbial identification from environmental samples.