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In recent years, Cas12a, a new member of the CRISPR family, has been found to have both DNase and RNase activities, have a simple structure, and a single promoter can simultaneously initiate multiple crRNAs, making the CRISPR/Cas12a editing system more advantageous in terms of structure and mechanism of action. Our team has successfully constructed Cas12a system that can be used in silkworm. Cas12a can be used to edit the multiple target sites. In production, a lot of factors can affect the production of silk industry. In order to make the silkworm resistant to the virus, using gene editing technology to knock out key genes for replication and proliferation in the Bombyx mori nuclearpolyhedrosisvirus (BmNPV) genome. Multiple sites on the BmNPV genome were selected as the target sites. We constructed the multi-sites expression vector of gie1-M (361 bp, 597 bp, 927 bp of ie-1) that edited multiple sites of BmNPV ie-1. The effects of multi-sites editing system on the proliferation and replication of the virus after the BmNPV genome was knocked out were examined. The results show that compared with CRISPR/FnCas12a single-site editing (gie1), multi-sites editing (gie1-M) can knock out the BmNPV genome more effectively and have a higher inhibitory effect on virus replication and proliferation. This system can provide a new direction for the breeding of silkworm resistant materials, and it can also lay a good technical platform for the identification and research of biological gene function.
Microsporidia are obligate single-celled eukaryote parasites. Microsporidian infection can cause large economic losses to beneficial insects such as silkworms and honey bees. Identification of resistance biomacromolecules and breeding of transgenic lines resistant to the microsporidian Nosema bombycis are important for disease management. We previously used transcriptome analysis to identify a guanylate binding protein family BmAtlastin-n gene that was significantly upregulated after Nosema bombycis infection, and we determined that the molecule was highly expressed in resistance-related tissues such as the midgut, fat body and the epidermis. The transgenic silkworm line overexpressing BmAtlastin-n biomolecules had economic characters similar to those of non-transgenic lines. The transgenic OE-BmAtlastin-n lines had significantly improved survival after microspore infection. We used RT-PCR and H&E staining to show that the number of spores in the transgenic lines was significantly lower than in the control lines. In this study, we identified a BmAtlastin-n macromolecule with resistance to N. bombycis and developed a transgenic line. The results improved understanding of the GBP protein family and provided biomacromolecule material for the treatment and prevention of microsporidia.
DNA methylation is an important epigenetic modification and has been shown to be involved in the response to abiotic stress. However, there are few studies on DNA methylation in insect response to environmental signals. In this study, we conducted a comprehensive comparative analysis of DNA methylation profiles between two silkworm strains with significantly different resistance to heat and humidity by whole-genome bisulfite sequencing (WGBS). We identified, in total, 2934 differentially methylated regions (DMRs) between RT_48h (resistant strain with high-temperature/humidity treatment for 48 h) and ST_48h (sensitive strain with high-temperature/humidity treatment for 48 h) under cytosine context (CG), which corresponded to 1230 DMR-related genes (DMGs), and the DMRs were primarily located in the gene body (exon and intron) region. Gene ontology (GO) and KEGG analysis showed that these DMGs were most significantly enriched in binding, cellular metabolic process, and RNA transport pathways. Moreover, 10 DMGs have been revealed to be involved in the heat-humidity stress response in the silkworm. The results of this study indicated that DNA methylation plays crucial roles in silkworm response to environmental stressors and provides important clues to identify key resistance genes in silkworm under high-temperature/humidity stress response.
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