CRISPR-Cas immunity in prokaryotes.
Level 5 - mechanism / opinion, no new human data
Narrative review of basic biological mechanisms (Level 5 by CEBM rules).
PubMed 26432244 · doi:10.1038/nature15386
What was done
This review outlines the molecular mechanism of clustered, regularly interspaced short palindromic repeat (CRISPR)-Cas adaptive immune systems in prokaryotes, summarizing how foreign viral genetic sequences are captured, processed into guide RNAs, and targeted for nuclease cleavage.
What was found
The abstract describes the functional stages of CRISPR immunity qualitatively and contains no numerical data or statistical measures. It details the process wherein host cells integrate a viral genome fragment (spacer) into the CRISPR locus, transcribe it into small RNA guides, and use Cas nucleases to cleave matching viral DNA, establishing vertically heritable resistance across generations.
Why it matters
It provides a foundational synthesis of the natural prokaryotic adaptive immune mechanism that serves as the basis for CRISPR-Cas genome engineering tools.
Limits
The abstract contains no empirical data, sample counts, quantitative metrics, or comparative analyses of specific Cas enzymes or microbial species.
Cited by
- supports CRISPR repeat sequences naturally function as an adaptive immune defense mechanism in bacteria against bacteriophage viruses.