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2017 ; 8
(ä): 529-541
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USH2A Gene Editing Using the CRISPR System
#MMPMID28918053
Fuster-García C
; García-García G
; González-Romero E
; Jaijo T
; Sequedo MD
; Ayuso C
; Vázquez-Manrique RP
; Millán JM
; Aller E
Mol Ther Nucleic Acids
2017[Sep]; 8
(ä): 529-541
PMID28918053
show ga
Usher syndrome (USH) is a rare autosomal recessive disease and the most common
inherited form of combined visual and hearing impairment. Up to 13 genes are
associated with this disorder, with USH2A being the most prevalent, due partially
to the recurrence rate of the c.2299delG mutation. Excluding hearing aids or
cochlear implants for hearing impairment, there are no medical solutions
available to treat USH patients. The repair of specific mutations by gene editing
is, therefore, an interesting strategy that can be explored using the CRISPR/Cas9
system. In this study, this method of gene editing is used to target the
c.2299delG mutation on fibroblasts from an USH patient carrying the mutation in
homozygosis. Successful in vitro mutation repair was demonstrated using
locus-specific RNA-Cas9 ribonucleoproteins with subsequent homologous
recombination repair induced by an engineered template supply. Effects on
predicted off-target sites in the CRISPR-treated cells were discarded after a
targeted deep-sequencing screen. The proven effectiveness and specificity
of these correction tools, applied to the c.2299delG pathogenic variant of USH2A,
indicates that the CRISPR system should be considered to further explore a
potential treatment of USH.