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Bio Biology

BiologyNEB 2075 (old course)

What is the role of 'restriction endonucleases' in genetic engineering?

1

Answer

· Based on the official syllabus and past papers
Updated

Restriction endonucleases play a crucial role in genetic engineering by facilitating the precise cutting of DNA molecules at specific sequences. These enzymes recognize and bind to specific nucleotide sequences, typically 4–8 base pairs long, known as restriction sites. Once bound, they cleave the DNA either within or adjacent to these sites, generating fragments with sticky ends (overhangs) or blunt ends.

Key Roles:

  • DNA Fragmentation: They cut foreign DNA (e.g., plasmids, viral DNA) into manageable pieces for cloning.
  • Recombinant DNA Formation: By cutting both the vector DNA (e.g., plasmid) and target DNA, they allow insertion of foreign genes via ligation.
  • Gene Isolation: Enable extraction of specific genes for further manipulation.
  • Molecular Cloning: Essential for creating recombinant plasmids or artificial chromosomes in gene cloning.

Their specificity ensures precise genetic modifications, a cornerstone of techniques like PCR, gene therapy, and CRISPR editing.

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