Abstract
CRISPR is the acronym for a recently discovered defense system against the invasion of foreign genetic elements, such as transposons, phages, or plasmids. Originally observed during genome sequencing of bacteria and archaea, the CRISPR system has been proven to confer adaptive and inheritable immunity against foreign nucleic acid. Although quite different in the components and mechanisms involved, it resembles the RNA interference phenomenon of eukaryotes (RNAi), an important control and defense tool with widespread applications in research and medical developments. The CRISPR system consists of genomic clusters of short repeat sequences flanking unique spacer sequences of similar length (CRISPR = Clustered Regularly Interspaced Short Palindromic Repeats). The spacer sequences derive from the DNA of previous invaders and are taken up in the bacterial CRISPR array by mechanisms not yet solved. In case of a new infection, CRISPR arrays are transcribed and the RNA is processed and assembled into ribonucleoprotein complexes, which target the DNA of the invader through base pair complementarity. The targeted DNA is then inactivated by hydrolytic destruction.
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Wagner, R., Pul, Ü. (2012). CRISPR: A Bacterial Immunity System Based on Small RNAs. In: Erdmann, V., Barciszewski, J. (eds) From Nucleic Acids Sequences to Molecular Medicine. RNA Technologies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27426-8_6
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DOI: https://doi.org/10.1007/978-3-642-27426-8_6
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