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Diverse CRISPRs evolving in human microbiomes.

Mina Rho1, Yu-Wei Wu, Haixu Tang

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Summary
This summary is machine-generated.

This study explores CRISPR-Cas systems in the human microbiome, discovering 86 novel CRISPRs and revealing body-site specific distributions. CRISPR analysis aids in tracking microbes and viral exposure within individuals.

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Area of Science:

  • Microbiology and Genomics
  • Bioinformatics and Computational Biology

Background:

  • CRISPR-Cas systems provide adaptive immunity in prokaryotes against foreign nucleic acids.
  • Human Microbiome Project datasets offer opportunities to study CRISPR diversity in human-associated microbes.

Purpose of the Study:

  • To explore the distribution and diversity of known and novel CRISPRs in human microbiomes.
  • To develop and apply a targeted assembly strategy for comprehensive CRISPR identification.

Main Methods:

  • Utilized shotgun metagenomic datasets from the Human Microbiome Project.
  • Developed a targeted assembly strategy using CRISPR repeat consensus sequences to recruit and assemble reads.
  • Identified known and novel CRISPR variants from whole-metagenome assemblies and targeted assemblies.

Main Results:

  • Identified 64 known and 86 novel CRISPR loci across human-associated microbial communities.
  • Observed largely body-site specific distributions for identified CRISPRs.
  • Demonstrated CRISPRs' utility in tracing rare species and individual viral exposure, with high spacer similarity within individuals and oral sites.

Conclusions:

  • CRISPR-Cas systems exhibit significant diversity and body-site specificity within the human microbiome.
  • Targeted assembly is crucial for comprehensive identification of CRISPR loci.
  • CRISPR analysis holds potential for microbiome research, including tracking microbial populations and viral exposure.