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2015 ; 5
(ä): 16031
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Controlled delivery of ?-globin-targeting TALENs and CRISPR/Cas9 into mammalian
cells for genome editing using microinjection
#MMPMID26558999
Cottle RN
; Lee CM
; Archer D
; Bao G
Sci Rep
2015[Nov]; 5
(ä): 16031
PMID26558999
show ga
Tal-effector nucleases (TALEN) and clustered regularly interspaced short
palindromic repeats (CRISPR) with CRISPR-associated (Cas) proteins are genome
editing tools with unprecedented potential. However, the ability to deliver
optimal amounts of these nucleases into mammalian cells with minimal toxicity
poses a major challenge. Common delivery approaches are transfection- and
viral-based methods; each associated with significant drawbacks. An alternative
method for directly delivering genome-editing reagents into single living cells
with high efficiency and controlled volume is microinjection. Here, we
characterize a glass microcapillary-based injection system and demonstrate
controlled co-injection of TALENs or CRISPR/Cas9 together with donor template
into single K562 cells for targeting the human ?-globin gene. We quantified
nuclease induced insertions and deletions (indels) and found that, with
?-globin-targeting TALENs, similar levels of on- and off-target activity in cells
could be achieved by microinjection compared with nucleofection. Furthermore, we
observed 11% and 2% homology directed repair in single K562 cells co-injected
with a donor template along with CRISPR/Cas9 and TALENs respectively. These
results demonstrate that a high level of targeted gene modification can be
achieved in human cells using glass-needle microinjection of genome editing
reagents.