Optofluidic Single-Cell Genome Amplification of Sub-micron Bacteria in the Ocean Subsurface

Area of Science:

• Marine microbiology
• Genomics
• Optofluidics

Background:

• Sub-micron marine plankton cells are challenging to study due to small sample volumes.
• Previous methods limited the ability to obtain high-quality genomes from individual marine bacteria.

Purpose of the Study:

• To demonstrate the efficacy of optofluidic single-cell genome amplification for retrieving and analyzing genomes from marine bacterioplankton.
• To characterize novel bacterial genomes from the Sargasso Sea and infer their metabolic functions and ecological niches.

Main Methods:

• Optofluidic single-cell genome amplification and sequencing.
• Visual selection and optical trapping of plankton cells.
• Metagenomic analysis and metabolic reconstruction.

Main Results:

• Successfully obtained 20 partial genome sequences from seven bacterial phyla.
• Detailed characterization of E01-9C-26 (Gammaproteobacteria) and Opi.OSU.00C (Verrucomicrobia), including their metabolic pathways and ecological distribution.
• Identified novel monooxygenase genes in E01-9C-26 and carbohydrate metabolism genes in Opi.OSU.00C.

Conclusions:

• Optofluidics is an effective tool for retrieving diverse single-cell bacterioplankton genomes, particularly from small sample volumes.
• The study expands our understanding of marine microbial diversity and function in the Sargasso Sea.
• This technology holds promise for future microbiology applications requiring targeted cell isolation and genomic analysis.