Abstract
“CRISPR" is short and used for "CRISPR-Cas9. CRISPR stands for clustered regularly interspaced short palindromic repeats. CRISPRs are specialized stretches of DNA. The protein Cas9 (or "CRISPR-associated") is an enzyme that acts like a pair of molecular scissors, capable of cutting strands of DNA and can be used in conjunction with engineered CRISPR sequences to hunt down codes and slice into them like a molecular scalpel, allowing geneticists to cut out a target gene, either to remove it or replace it with a new sequence. Therefore it is a simple and powerful tool for editing genomes to easily alter DNA sequences and amend gene function. In 1987, The CRISPR locus was first identified in Escherichia coli and discovered when a genetic structure containing 5 highly homologous repeats of 29 nucleotides separated by 32-nucleotide spacers (Ishino Y 1987).
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