ABSTRACT
The antigen gene expression level of a DNA vaccine is the key factor influencing the efficacy of the DNA vaccine. Accordingly, one of the ways to improve the antigen gene expression level of a DNA vaccine is to utilize a plasmid vector that is replicable in eukaryotic cells. A replicative DNA vaccine vector pCMVori was constructed based on the non-replicative pcDNA3.1 and the replicon of porcine circovirus 2 (PCV2) in this study. An EGFP gene was cloned into pCMVori and the control plasmid pcDNA3.1. The two recombinant vectors were transfected into PK-15 cell, and the plasmid DNA and RNA were extracted from the transfected cells. Real-time PCR was used to determine the plasmid replication efficiency of the two plasmids using plasmid before and after Bcl Ⅰ digestion as templates, and the transcription level of the Rep gene in PCV2 replicon was detected by RT-PCR. The average fluorescence intensity of cells transfected with the two plasmids was analyzed with software Image J, and the transcription level of EGFP was determined by means of real-time RT-PCR. The results showed that the replication efficiency of pCMVori in PK-15 cells incubated for 48 h was 136%, and the transcriptions of Rep and Rep' were verified by RT-PCR. The average fluorescence intensity of the cells transfected with pCMVori-EGFP was 39.14% higher than that of pcDNA3.1-EGFP, and the transcription level of EGFP in the former was also 40% higher than that in the latter. In conclusion, the DNA vaccine vector pCMVori constructed in this study can independently replicate in eukaryotic cells. As a result, the expression level of cloned target gene was elevated, providing a basis for developing the pCMVori-based DNA vaccine.
Subject(s)
Animals , Swine , Circovirus/genetics , Vaccines, DNA/genetics , Replicon/genetics , Genetic Vectors/genetics , Plasmids/geneticsABSTRACT
ObjectiveThe type 2C protein phosphatases （PP2C） are involved in numerous plant signal transduction pathways. They mainly participate in plant stress response and regulate second metabolites biosynthesis via negatively regulating MAPK signaling pathway. Herein，we were to identify and analyze PP2C （CsPP2C） gene family from hemp genome，in hope of providing comprehensive insights for studying CsPP2C function during the development of hemp. MethodMolecular Evolutionary Genetics Analysis （MAGA）-X was used to construct phylogenetic tree. Expert Protein Analysis System （ExPASy），WoLF PSORT，Multiple EM for Motif Elicitation （MEME），Batch Conserved Domain Search （Batch-CD-Search），PlantCare，and TBtools were used，respectively，to predict CsPP2C physicochemical properties，subcellular localization，conserved motifs，protein structure，cis-element in promoter and collinearity with Arabidopsis PP2C. Cannabis sativa transcriptome and Real-time polymerase chain reaction（Real-time PCR） were used to analyze and verify gene expressions，respectively. ResultFifty-two CsPP2C with conserved domains were identified from the entire genome of hemp，encoding proteins ranging from 244 to 1 089 aa in length and with molecular weights ranging from 26.76 to 122.53 kDa. Those genes were mainly distributed in the nucleus，cytoplasm and chloroplast. The 47 CsPP2C were divided into 10 subfamilies，and the remaining 5 were not clustered. Seven pairs of homologous genes between hemp and Arabidopsis thaliana were identified according to collinear analysis. The light-responsive elements and abscisic acid elements are most abundant in the prediction. The gene expression heat map showed varied expression pattern of CsPP2C in different tissues. Real-time PCR results of three CsPP2C were consistent with transcriptome data. Moreover，alternative splicing analysis showed that some CsPP2C had alternative-splicing genes during evolution. ConclusionWe predicted and analyzed CsPP2C gene family in genomic scale and showed that CsPP2C are involved in many biological processes，whereby provides foundation for CsPP2C functional study.
ABSTRACT
ObjectiveThe type 2C protein phosphatases （PP2C） are involved in numerous plant signal transduction pathways. They mainly participate in plant stress response and regulate second metabolites biosynthesis via negatively regulating MAPK signaling pathway. Herein，we were to identify and analyze PP2C （CsPP2C） gene family from hemp genome，in hope of providing comprehensive insights for studying CsPP2C function during the development of hemp. MethodMolecular Evolutionary Genetics Analysis （MAGA）-X was used to construct phylogenetic tree. Expert Protein Analysis System （ExPASy），WoLF PSORT，Multiple EM for Motif Elicitation （MEME），Batch Conserved Domain Search （Batch-CD-Search），PlantCare，and TBtools were used，respectively，to predict CsPP2C physicochemical properties，subcellular localization，conserved motifs，protein structure，cis-element in promoter and collinearity with Arabidopsis PP2C. Cannabis sativa transcriptome and Real-time polymerase chain reaction（Real-time PCR） were used to analyze and verify gene expressions，respectively. ResultFifty-two CsPP2C with conserved domains were identified from the entire genome of hemp，encoding proteins ranging from 244 to 1 089 aa in length and with molecular weights ranging from 26.76 to 122.53 kDa. Those genes were mainly distributed in the nucleus，cytoplasm and chloroplast. The 47 CsPP2C were divided into 10 subfamilies，and the remaining 5 were not clustered. Seven pairs of homologous genes between hemp and Arabidopsis thaliana were identified according to collinear analysis. The light-responsive elements and abscisic acid elements are most abundant in the prediction. The gene expression heat map showed varied expression pattern of CsPP2C in different tissues. Real-time PCR results of three CsPP2C were consistent with transcriptome data. Moreover，alternative splicing analysis showed that some CsPP2C had alternative-splicing genes during evolution. ConclusionWe predicted and analyzed CsPP2C gene family in genomic scale and showed that CsPP2C are involved in many biological processes，whereby provides foundation for CsPP2C functional study.