Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29899280
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Genes+(Basel)
2018 ; 9
(6
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Efficient Knock-in of a Point Mutation in Porcine Fibroblasts Using the
CRISPR/Cas9-GMNN Fusion Gene
#MMPMID29899280
Gerlach M
; Kraft T
; Brenner B
; Petersen B
; Niemann H
; Montag J
Genes (Basel)
2018[Jun]; 9
(6
): ä PMID29899280
show ga
During CRISPR/Cas9 mediated genome editing, site-specific double strand breaks
are introduced and repaired either unspecific by non-homologous end joining
(NHEJ) or sequence dependent by homology directed repair (HDR). Whereas
NHEJ-based generation of gene knock-out is widely performed, the HDR-based
knock-in of specific mutations remains a bottleneck. Especially in primary cell
lines that are essential for the generation of cell culture and animal models of
inherited human diseases, knock-in efficacy is insufficient and needs significant
improvement. Here, we tested two different approaches to increase the knock-in
frequency of a specific point mutation into the MYH7-gene in porcine fetal
fibroblasts. We added a small molecule inhibitor of NHEJ, SCR7
(5,6-bis((E)-benzylideneamino)-2-mercaptopyrimidin-4-ol), during genome editing
and screened cell cultures for the point mutation. However, this approach did not
yield increased knock-in rates. In an alternative approach, we fused humanized
Cas9 (hCas9) to the N-terminal peptide of the Geminin gene (GMNN). The fusion
protein is degraded in NHEJ-dominated cell cycle phases, which should increase
HDR-rates. Using hCas9-GMNN and point mutation-specific real time PCR screening,
we found a two-fold increase in genome edited cell cultures. This increase of HDR
by hCas9-GMNN provides a promising way to enrich specific knock-in in porcine
fibroblast cultures for somatic cloning approaches.