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2016 ; 6
(ä): 32386
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In vivo mutagenesis of miRNA gene families using a scalable multiplexed
CRISPR/Cas9 nuclease system
#MMPMID27572667
Narayanan A
; Hill-Teran G
; Moro A
; Ristori E
; Kasper DM
; A Roden C
; Lu J
; Nicoli S
Sci Rep
2016[Aug]; 6
(ä): 32386
PMID27572667
show ga
A large number of microRNAs (miRNAs) are grouped into families derived from the
same phylogenetic ancestors. miRNAs within a family often share the same
physiological functions despite differences in their primary sequences, secondary
structures, or chromosomal locations. Consequently, the generation of animal
models to analyze the activity of miRNA families is extremely challenging. Using
zebrafish as a model system, we successfully provide experimental evidence that a
large number of miRNAs can be simultaneously mutated to abrogate the activity of
an entire miRNA family. We show that injection of the Cas9 nuclease and two,
four, ten, and up to twenty-four multiplexed single guide RNAs (sgRNAs) can
induce mutations in 90% of the miRNA genomic sequences analyzed. We performed a
survey of these 45 mutations in 10 miRNA genes, analyzing the impact of our
mutagenesis strategy on the processing of each miRNA both computationally and in
vivo. Our results offer an effective approach to mutate and study the activity of
miRNA families and pave the way for further analysis on the function of complex
miRNA families in higher multicellular organisms.