Comprehensive mapping of essential-gene interactions in M. tuberculosis.

Dual-sgRNA CRISPR-interference GI mapping in Mycobacterium tuberculosis and Mycobacterium smegmatis uncovers thousands of previously unrecognized essential-gene interactions.

• Why it matters: Many Mycobacterium tuberculosis genes remain uncharacterized, limiting tuberculosis biology insight and constraining drug development. Genetic interaction mapping can reveal functional relationships between genes beyond single-gene effects.
• What they did: The study built a dual-sgRNA CRISPR-interference platform with unique barcodes per sgRNA pair and a robust statistical pipeline to detect GIs. It generated comprehensive essential-gene GI maps in Mycobacterium smegmatis and Mycobacterium tuberculosis, then used AlphaFold3-based protein-protein interaction predictions for all gene pairs.
• The result: The GI maps recapitulate known biology, identify functional links between essential genes and drug targets, and suggest that a subset of GIs reflects physical associations. Validation of selected interactions confirms novel relationships and opportunities for synergistic targeting.

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