Planetary-scale metagenomic analysis reveals CRISPR targeting dynamics across ecosystems.

A computational survey of 367,609 metagenomes collected 794 million CRISPR spacers and found 1.18 billion hits linking 41 million spacers to 2.5 million viruses and plasmids.

• Why it matters: Microbial interactions with mobile genetic elements shape microbiome dynamics, yet a global view of CRISPR spacer diversity and activity across biomes is missing.
• What they did: The approach mined short-read metagenomic data to assemble spacer catalogs and quantify spacer matches to viruses and plasmids across Earth’s biomes.
• The result: Spacer matches to known viruses were more prevalent and conserved, consistent with positive selection, and the data also suggest recurrent phage genome entry into non-host microbial cells.

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