Editing of Genomic TNFSF9 by CRISPR-Cas9 Can Be Followed by Re-Editing of Its Transcript.
Mol Cells
; 41(10): 917-922, 2018 Oct 31.
Article
in En
| MEDLINE
| ID: mdl-30352492
ABSTRACT
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.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Genomics
/
4-1BB Ligand
/
CRISPR-Cas Systems
/
Gene Editing
Limits:
Humans
Language:
En
Journal:
Mol Cells
Journal subject:
BIOLOGIA MOLECULAR
Year:
2018
Document type:
Article