Tandem repeats in methanogenic archaea and their viruses reveal a shared potential for rapid genomic diversification

Tandem repeats in methanogenic Methanosarcina genomes occur at over 30-fold higher density than the prokaryotic average, with conserved loci but minimal strain-to-strain sequence identity.

• Why it matters: Methanogens show rapid, reversible physiological flexibility that horizontal gene transfer alone cannot readily explain, motivating a mechanism for intrinsic genomic change.
• What they did: The authors screened 50,567 prokaryotic genomes, then assessed repeat locus conservation, transcription and ribosome occupancy, genomic neighborhood patterns, and protein disorder and viral occurrence.
• The result: Repeat regions are transcribed, ribosome-occupied, and enriched near regulatory and cofactor-related genes while being depleted near core energy and translation machinery, and they appear in methanogen-infecting viruses, suggesting rapid diversification potential.

AI summary of the abstract · may contain errors · not medical advice · read the paper.