pBac[3xp3-EGFP-IE1Cas9] plasmid vector家蠶基因編輯質(zhì)粒載體

The CRISPR/Cas9 system has been proven as a revolutionary genome engineering tool. In most
40 cases, single guide RNA (sgRNA) targeting sites have been designed as GN19NGG or GGN18NGG,
41 because of restriction of the initiation nucleotide for RNA Pol III promoters. Here, we demonstrate that
42 the U6 promoter from a lepidopteran model insect, Bombyx mori, effectively expressed the sgRNA
43 initiated with any nucleotide bases (adenine, thymine, guanine or cytosine), which further expands the
44 CRISPR targeting space. A detailed expansion index in the genome was analysed when N20NGG was
45 set as the CRISPR targeting site instead of GN19NGG, and revealed a significant increase of suitable
46 targets, with the highest increase occurring on the Z sex chromosome. Transfection of different types of
47 N20NGG sgRNAs targeting the enhanced green fluorescent protein (EGFP) combined with Cas9,
48 significantly reduced EGFP expression in the BmN cells. An endogenous gene, BmBLOS2, was also
49 disrupted by using various types of N20NGG sgRNAs, and the cleavage efficiency of N20NGG
50 sgRNAs with different initial nucleotides and GC contents was evaluated in vitro. Furthermore,
51 transgenic silkworms expressing Cas9 and sgRNAs targeting the BmBLOS2 gene were generated with
52 many types of mutagenesis. The typical transparent skin phenotype in knock-out silkworms was stable
53 and inheritable, suggesting that N20NGG sgRNAs function sufficiently in vivo. Our findings represent
54 a renewal of CRISPR/Cas9 target design and will greatly facilitate insect functional genetics research.

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