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J Invertebr Pathol ; 170: 107323, 2020 Jan 09.
Artigo em Inglês | MEDLINE | ID: mdl-31926972


Bombyx mori nucleopolyhedrosis virus (BmNPV) has always been a great challenge to the development and stability of the sericulture industry. LncRNAs have been reported to play important roles in gene expression regulation, development and immune response but the roles of lncRNAs in BmNPV infection and silkworm-BmNPV interaction are not clear. We used a genome-wide transcriptome analysis to identify the lncRNAs in Bombyx mori cells (BmN cells) and analyzed the differentially expressed lncRNAs, microRNAs and protein-coding genes in silkworm cells with or without BmNPV infection. A total of 13,159 candidate lncRNAs were identified in the BmN cells, among which 4450 lncRNAs were differentially expressed (DE) with 2837 up-regulated and 1613 down-regulated. In addition, 66 differentially expressed miRNAs (DEmiRNAs) and 7448 differentially expressed mRNAs (DEmRNAs) were identified, and DElncRNA-DEmiRNA-DEmRNA regulatory network was constructed. Gene expression was variable in 4973 of predicted lncRNA cis target genes in BmNPV infected cells. KEGG pathway analysis indicated that the target genes of DElncRNAs are enriched in ubiquitin mediated proteolysis, endocytosis and lysosome pathways. qRT-PCR validated the differential expression of several lncRNAs and miRNAs. Our results suggested that DElncRNAs participate in host response to BmNPV infection via interactions with their target genes and miRNAs. Our results will help us to improve our understanding of lncRNA-mediated regulatory roles in BmNPV infection and provide new insights into silkworm-pathogen interactions.

BMC Genomics ; 20(1): 736, 2019 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-31615392


BACKGROUND: Bombyx mori nucleopolyhedrosis virus (BmNPV) is a major pathogen that threatens the sustainability of the sericultural industry. DNA methylation is a widespread gene regulation mode in epigenetics, which plays an important role in host immune response. Until now, little has been known about epigenetic regulation on virus diseases in insects. This study aims to explore the role of DNA methylation in BmNPV proliferation. RESULTS: Inhibiting DNA methyltransferase (DNMT) activity of silkworm can suppress BmNPV replication. The integrated analysis of transcriptomes and DNA methylomes in silkworm midguts infected with or without BmNPV showed that both the expression pattern of transcriptome and DNA methylation pattern are changed significantly upon BmNPV infection. A total of 241 differentially methylated regions (DMRs) were observed in BmNPV infected midguts, among which, 126 DMRs were hyper-methylated and 115 DMRs were hypo-methylated. Significant differences in both mRNA transcript level and DNA methylated levels were found in 26 genes. BS-PCR validated the hypermethylation of BGIBMGA014008, a structural maintenance of chromosomes protein gene in the BmNPV-infected midgut. In addition, DNMT inhibition reduced the expression of inhibitor of apoptosis family genes, iap1 from BmNPV, Bmiap2, BmSurvivin1 and BmSurvivin2. CONCLUSION: Our results indicate that DNA methylation plays positive roles in BmNPV proliferation and loss of DNMT activity could induce the apoptosis of infected cells to suppress BmNPV proliferation. Our results may provide a new idea and research direction for the molecular mechanism on insect-virus interaction.

Bombyx/virologia , Metilação de DNA , Inibidores Enzimáticos/farmacologia , Perfilação da Expressão Gênica/veterinária , /fisiologia , Animais , Bombyx/genética , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , DNA (Citosina-5-)-Metiltransferases/antagonistas & inibidores , Epigênese Genética , Epigenômica , Regulação da Expressão Gênica , Interações entre Hospedeiro e Microrganismos , Análise de Sequência de RNA , Replicação Viral/efeitos dos fármacos