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2017 ; 12
(9
): e0184009
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gab.com Text
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Cas9/gRNA targeted excision of cystic fibrosis-causing deep-intronic splicing
mutations restores normal splicing of CFTR mRNA
#MMPMID28863137
Sanz DJ
; Hollywood JA
; Scallan MF
; Harrison PT
PLoS One
2017[]; 12
(9
): e0184009
PMID28863137
show ga
Cystic Fibrosis is an autosomal recessive disorder caused by mutations in the
CFTR gene. CRISPR mediated, template-dependent homology-directed gene editing has
been used to correct the most common mutation, c.1521_1523delCTT / p.Phe508del
(F508del) which affects ~70% of individuals, but the efficiency was relatively
low. Here, we describe a high efficiency strategy for editing of three different
rare CFTR mutations which together account for about 3% of individuals with
Cystic Fibrosis. The mutations cause aberrant splicing of CFTR mRNA due to the
creation of cryptic splice signals that result in the formation of pseudoexons
containing premature stop codons c.1679+1634A>G (1811+1.6kbA>G) and
c.3718-2477C>T (3849+10kbC>T), or an out-of-frame 5' extension to an existing
exon c.3140-26A>G (3272-26A>G). We designed pairs of Cas9 guide RNAs to create
targeted double-stranded breaks in CFTR either side of each mutation which
resulted in high efficiency excision of the target genomic regions via
non-homologous end-joining repair. When evaluated in a mini-gene splicing assay,
we showed that targeted excision restored normal splicing for all three
mutations. This approach could be used to correct aberrant splicing signals or
remove disruptive transcription regulatory motifs caused by deep-intronic
mutations in a range of other genetic disorders.