High-throughput, single-microbe genomics with strain resolution, applied to a human gut microbiome

Area of Science:

• Microbiology
• Genomics
• Bioinformatics

Background:

• Characterizing microbial communities at single-cell resolution is crucial for understanding their functions.
• Existing methods often struggle with the complexity and diversity of microbial ecosystems.

Purpose of the Study:

• To develop a high-throughput, culture-free method for obtaining individual microbial genomes from complex communities.
• To apply this method to the human gut microbiome for detailed genomic analysis and interaction studies.

Main Methods:

• Microbial single-amplified genomes (SAGs) were generated using Microbe-seq, a microfluidics-based approach.
• Individual microbes were encapsulated in droplets, their DNA liberated, amplified, and barcoded.
• Sequencing and coassembly of over 20,000 SAGs from a single human donor.

Main Results:

• Successfully coassembled genomes from nearly 100 bacterial species, including multiple subspecies strains.
• Reconstructed the horizontal gene transfer (HGT) network, identifying HGT between 92 species pairs.
• Discovered a specific in vivo host-phage association between crAssphage and *Bacteroides vulgatus*.

Conclusions:

• Microbe-seq provides high-throughput, culture-free capabilities for single-microbe genomic analysis.
• This method significantly advances the study of complex microbial communities and their interactions.
• Enables detailed investigation of genomic blueprints and ecological dynamics within microbiomes.