O1群El Tor霍亂弧菌產(chǎn)毒株超級整合予的結(jié)構(gòu)特征及不同培養(yǎng)條件下的轉(zhuǎn)錄譜分析
[Abstract]:Cholera remains an important public health problem in many developing countries so far. Vibrio cholerae is the pathogen of cholera. In 1999, superintegron (super-integron SI) .SI was first found in El Tor Vibrio cholerae N16961, except for a few known genes related to the adaptive survival of Vibrio cholerae. The results showed that the structural variation of SI in Vibrio cholerae was obvious, and the difference of SI among strains produced by Vibrio cholerae of different ElTor was the important reason for the difference among these strains. The SI structures of 60 strains of Vibrio cholerae isolated from 1961 to 2008 in China were studied by PCR scanning and sequencing. In addition, the transcription of SI gene of Vibrio cholerae N16961 in M9 medium, bile salt medium and AKI medium was studied by real-time fluorescence PCR, and compared with that of LB (luria bertani medium). BLAST,Artemis Comparison Tool,Clustal W and MEGA 4.0 software were used to determine the conserved and variant sites of repeat (Vibrio cholerae repeat sequence VCR) of Vibrio cholerae in N16961 SI, as well as the composition and distribution of VCR and gene cassette. On the basis of VCR analysis, we analyzed the structural characteristics of 60 strains of Vibrio cholerae O1E1 Tor produced by Vibrio cholerae O1E1 isolated from 19 provinces, autonomous regions and municipalities of China from 1961 to 2008, and plotted the composition of ORF (open reading frame) in SI of these 60 strains. It was found that the arrangement of most gene cassettes in the experimental strain SI was collinear, but the SI of the strains in different epidemic years still had obvious diversity. Diversity forms include sequence insertion, sequence substitution and sequence deletion. It is very likely that the diversity of SI in the strains isolated in the 1960s and 1970s was more evident through the recombination of repeat sequences between VCRs. However, the diversity of SI of the strains isolated in the 1990s was very low. The SI of the strains isolated in the 1990s had a signature deletion of 24kb, suggesting that the isolated strains had characteristic SI structure in different cholera epidemic peaks. The structure of the experimental strain SI suggests that with the change of cholera epidemic age, the type of SI structure of the epidemic strain is gradually decreasing. Sequence analysis of the inserted gene cassette in the experimental strain suggested that the SI gene box of El Tor producing strain might come from Vibrio cholerae of other serogroup and SI structure of Vibrio mimicus. El Tor strain. The method of sequencing is effective in studying the structure of El Tor virulent strain SI. The results showed that gene box flow in SI of different cholera strains persisted. N16961 was cultured in bile salt M9 and AKI medium, and the transcription level of ORF in Sl was studied by real-time fluorescence PCR. The results showed that, compared with the results of transcription cultured in LB medium, a small amount of ORF transcriptional level was changed under the condition of bile salt Aki culture, while most of the ORF in the super integron of strain M9 was transcripted under the condition of M9 culture. And showed a high level of expression. A few of the ORF functions have been known. These functions are mainly concentrated in the culture conditions of metabolic and removable extrinsic element M9, and the transcription level of ORF related to DNA metabolism and lipid metabolism is increased. The results showed that SI was closely related to the adaptive survival of the strain under low nutrition.
【學(xué)位授予單位】:中國疾病預(yù)防控制中心
【學(xué)位級別】:博士
【學(xué)位授予年份】:2011
【分類號】:R378
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