Expansion of CRISPR targeting sites in Bombyx mori

Abstract

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

The Masc gene product controls masculinization in the black cutworm, Agrotis ipsilon

“…The recombinant plasmids were extracted and purified with phenol chloroform. Transfection was performed as described (Zeng et al ., ). Cells were assessed by fluorescence microscopy at 72 h after transfection.…”

Mutation of doublesex in Hyphantria cunea results in sex‐specific sterility

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“…A custom gRNA was synthesized with the 500 bp fragment template which was amplified from the sequenced vector using specific primers (PJET‐F500, gRNA‐R20, Table S2) in vitro using the MAXIscript T7 Kit (Ambion, Austin, TX, USA). Cas9 mRNA was prepared using the mMESSAGE mMACHINE kit (Ambion) according to the manufacturer's instructions and as previously described …”

Genome editing in Bombyx mori: New opportunities for silkworm functional genomics and the sericulture industry

“…Zeng et al . () expanded the targeting sites by verifying the initial nucleotides of the BmU6 promoter. Ma et al .…”