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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2018 ; 9
(1
): 939
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Microhomology-assisted scarless genome editing in human iPSCs
#MMPMID29507284
Kim SI
; Matsumoto T
; Kagawa H
; Nakamura M
; Hirohata R
; Ueno A
; Ohishi M
; Sakuma T
; Soga T
; Yamamoto T
; Woltjen K
Nat Commun
2018[Mar]; 9
(1
): 939
PMID29507284
show ga
Gene-edited induced pluripotent stem cells (iPSCs) provide relevant isogenic
human disease models in patient-specific or healthy genetic backgrounds. Towards
this end, gene targeting using antibiotic selection along with engineered point
mutations remains a reliable method to enrich edited cells. Nevertheless,
integrated selection markers obstruct scarless transgene-free gene editing. Here,
we present a method for scarless selection marker excision using engineered
microhomology-mediated end joining (MMEJ). By overlapping the homology arms of
standard donor vectors, short tandem microhomologies are generated flanking the
selection marker. Unique CRISPR-Cas9 protospacer sequences nested between the
selection marker and engineered microhomologies are cleaved after gene targeting,
engaging MMEJ and scarless excision. Moreover, when point mutations are
positioned unilaterally within engineered microhomologies, both mutant and normal
isogenic clones are derived simultaneously. The utility and fidelity of our
method is demonstrated in human iPSCs by editing the X-linked HPRT1 locus and
biallelic modification of the autosomal APRT locus, eliciting disease-relevant
metabolic phenotypes.