Bacteriophage
Bacteriophage (or phage) is a virus that infects and replicates within bacteria and archaea. They are the most abundant biological entities on Earth and play a critical role in horizontal gene transfer and bacterial population control.
Key Concepts
- CRISPR-Cas Systems: Originally discovered as an adaptive immune system in bacteria and archaea against phage infection.
- Reverse Transcriptase: Enzymes that synthesize DNA from an RNA template, commonly found in retroviruses and retrotransposons.
- Array-associated Reverse Transcriptase (ART): A novel CRISPR-like system recently identified via AI analysis, expanding the known repertoire of phage-defense mechanisms.
Recent Developments
- 2026 AI Discovery: Claude AI Discovers Novel CRISPR-like System, Array-associated Reverse Transcriptase (ART)
- Identified a new class of defense systems involving array-associated reverse transcriptases.
- Suggests a broader evolutionary link between phage genomes and host adaptive immunity than previously understood.
- Challenges traditional boundaries between viral and host genetic machinery.