Expanding arsenal of type III CRISPR-Cas antiviral defense.

Type III CRISPR-Cas systems are a complex, versatile antiviral defense in prokaryotes that combine sequence-specific interference with nucleotide-based signaling and diverse downstream immune responses.

• Why it matters: The field needs a consolidated mechanistic picture because new work keeps expanding type III subtypes, effectors, second messengers, and viral counter-defense strategies.
• What they did: This review synthesizes recent mechanistic and structural findings spanning adaptation, target recognition, immune signaling, ancillary effector responses, and regulation, and it also surveys emerging biotechnological uses.
• The result: The integrated view clarifies how type III systems coordinate interference and signaling, while highlighting unanswered questions that will guide future research and application development.

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