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Shown below is the start of a coding region within the first exon of a gene. 5'-GCTCTTAGATATTCCACGACACAGCATGTCAAGAGAAGTACAGTAATGACGGACTAGTA-3' 3'-CGAGAATCTATAAGGTGCTGTGTCGTACAGTTCTCTTCATGTCATTACTGCCTGATCAT-5' What is the PAM sequence of the bottom strand of DNA?

Answer :

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Answer:

3'-GGT-5'

Explanation:

  • Protospacer adjacent motif or PAM is an important part of the CRISPR/Cas 9 gene editing system.
  • CRISPR/Cas 9 is a popular gene editing tool that uses an RNA guided endonuclease that cuts DNA at precise target points.
  • As shown in the picture, the CRISPR/Cas9 system consists of the following parts:
  1. Cas9 endonuclease
  2. Guide RNA complementary to the target sequence.
  3. PAM sequence - a 3 nucleotide sequence on the guide RNA that helps the Cas9 in recognizing and binding to the target DNA.
  • PAM sequences are located 3-6 nucleotides downstream of the target DNA.
  • Every endonuclease recognizes a different PAM sequence. However, the most commonly used Cas9 from Streptococcus pyogenes recognizes the sequence 5' NGG 3'. The "N" represents any nucleotide.
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