首页|MicroRNA let-7 targets BmCDK1 to regulate cell proliferation and endomitosis of silk gland in the silkworm,Bombyx mori
MicroRNA let-7 targets BmCDK1 to regulate cell proliferation and endomitosis of silk gland in the silkworm,Bombyx mori
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MicroRNAs play critical roles in multiple developmental processes in insects.Our previous study showed that CRISPR/Cas9-mediated knock down of the microRNA let-7 in silkworms increased the size of larvae and silk glands,thereby improving the silk production capacity.In this study,we elucidate the molecular mechanism underlying of let-7 regulates growth.Identification of differentially expressed genes in response to let-7 knock down revealed enrichment of pathways associated with cell proliferation and DNA replication.let-7 dysregulation affected the cell cycle and proliferation of the Bombyx mori cell line BmN.Dual-luciferase and target site mutation assays showed that BmCDK1 is a direct target gene of let-7,with only 1 binding site on its 3'-untranslated region.RNA interference of BmCDK1 inhibited cell proliferation,but this effect was counteracted by co-transfection with let-7 antagomir.Moreover,let-7 knock down induced BmCDK1 ex-pression and promoted cell proliferation in multiple tissues,and further induced endomi-tosis in the silk gland in vivo.Knock down of BmCDK1 resulted in abnormal formation of a new epidermis,and larval development was arrested at the 2nd or 3rd molt stage.Taken together,our results demonstrated that BmCDK1 is a novel target of let-7 in cell fate determination,possessing potential for improving silk yield in silkworm.
Integrative Science Center of Germplasm Creation in Western China(Chongqing)Science City,Biological Science Research Center,Southwest University,China
Key Laboratory for Germplasm Creation in Upper Reaches of the Yangtze River,Ministry of Agriculture and Rural Affairs,Chongqing,China
Engineering Laboratory of Sericultural and Functional Genome and Biotechnology,Development and Reform Commission,Chongqing,China
National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNatural Science Foundation of Chongqing,ChinaChongqing Special Support fund for Post Doctor
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