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Editing of Genomic TNFSF9 by CRISPR-Cas9 Can Be Followed by Re-Editing of Its Transcript

  • Lee, Hyeon-Woo (Institute of Oral Biology, School of Dentistry, Graduate School, Kyung Hee University)
  • 투고 : 2018.05.15
  • 심사 : 2018.08.14
  • 발행 : 2018.10.31

초록

The CRISPR-Cas system is a well-established RNA-guided DNA editing technique widely used to modify genomic DNA sequences. I used the CRISPR-Cas9 system to change the second and third nucleotides of the triplet $T{\underline{CT}}$ of human TNSFSF9 in HepG2 cells to $T{\underline{AG}}$ to create an amber stop codon. The $T{\underline{CT}}$ triplet is the codon for Ser at the $172^{nd}$ position of TNSFSF9. The two substituted nucleotides, AG, were confirmed by DNA sequencing of the PCR product followed by PCR amplification of the genomic TNFSF9 gene. Interestingly, sequencing of the cDNA of transcripts of the edited TNFSF9 gene revealed that the $T{\underline{AG}}$ had been re-edited to the wild type triplet $T{\underline{CT}}$, and 1 or 2 bases just before the triplet had been deleted. These observations indicate that CRISPR-Cas9-mediated editing of bases in target genomic DNA can be followed by spontaneous re-editing (correcting) of the bases during transcription.

키워드

참고문헌

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