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2016 ; 113
(20
): 5676-81
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Site-specific genome editing for correction of induced pluripotent stem cells
derived from dominant dystrophic epidermolysis bullosa
#MMPMID27143720
Shinkuma S
; Guo Z
; Christiano AM
Proc Natl Acad Sci U S A
2016[May]; 113
(20
): 5676-81
PMID27143720
show ga
Genome editing with engineered site-specific endonucleases involves nonhomologous
end-joining, leading to reading frame disruption. The approach is applicable to
dominant negative disorders, which can be treated simply by knocking out the
mutant allele, while leaving the normal allele intact. We applied this strategy
to dominant dystrophic epidermolysis bullosa (DDEB), which is caused by a
dominant negative mutation in the COL7A1 gene encoding type VII collagen (COL7).
We performed genome editing with TALENs and CRISPR/Cas9 targeting the mutation,
c.8068_8084delinsGA. We then cotransfected Cas9 and guide RNA expression vectors
expressed with GFP and DsRed, respectively, into induced pluripotent stem cells
(iPSCs) generated from DDEB fibroblasts. After sorting, 90% of the iPSCs were
edited, and we selected four gene-edited iPSC lines for further study. These
iPSCs were differentiated into keratinocytes and fibroblasts secreting COL7.
RT-PCR and Western blot analyses revealed gene-edited COL7 with frameshift
mutations degraded at the protein level. In addition, we confirmed that the
gene-edited truncated COL7 could neither associate with normal COL7 nor undergo
triple helix formation. Our data establish the feasibility of mutation
site-specific genome editing in dominant negative disorders.