Mol. Cells 2018; 41(10):
Editing of Genomic TNFSF9 by CRISPR-Cas9 Can Be Followed by Re-Editing of Its Transcript
Hyeon-Woo Lee*
Institute of Oral Biology, School of Dentistry, Graduate School, Kyung Hee University, Seoul 02447, Korea
Received May 15, 2018; Accepted August 14, 2018.; Published online October 1, 2018.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

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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 TCT of human TNSFSF9 in HepG2 cells to TAG to create an amber stop codon. The TCT triplet is the codon for Ser at the 172nd 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 TAG had been re-edited to the wild type triplet TCT, 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.
Keywords: CRISPR-Cas9, genomic DNA editing, RNA editing, TNFSF9

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30 September 2018 Volume 41,
Number 9, pp. 809~880

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