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Xu JJ, Shi C, Hong XQ, Chu F, Bai QK, Wang J, Shi YM, Guo ZX, Zhang XR, Wang FC, Zhang M, Chang XT, Zhang XC, Zhong YW. [Study of the predictive role of serum HBV RNA on HBeAg serological conversion in children with chronic hepatitis B]. Zhonghua Gan Zang Bing Za Zhi 2023; 31:1182-1186. [PMID: 38238952 DOI: 10.3760/cma.j.cn501113-20220121-00038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Objective: To investigate the role of serum hepatitis B virus RNA (HBV RNA) in predicting HBeAg serological conversion in children with chronic hepatitis B. Methods: 175 children aged 1~17 years with chronic hepatitis B who received interferon α (IFNα) for 48 weeks were selected. Patients were divided into HBeAg seroconversion and non-conversion based on whether HBeAg seroconversion occurred at 48 weeks of treatment.T-test and Mann-Whitney U test were used to compare between groups; chisquare test or Fisher exact probability method was used to compare the frequency between groups of classified variables; and Pearson correlation was used to analyze the correlation between indicators. Univariate and multivariate logistic regression analyses were used to identify influencing factors associated with HBeAg serological conversion. The predictive effect of HBV RNA, HBV DNA, and HBsAg on HBeAg serological conversion was compared and analyzed by the receiver operating characteristic curve (ROC). Results: The seroconversion rate of HBeAg at 48 weeks was 36.0% (63/175). The reduction in HBVRNA levels from baseline to the 12th, 24th, 36th, and 48th weeks of antiviral therapy was significantly greater in the HBeAg serological conversion group than that in the non-conversion group, and the difference was statistically significant between the two groups (P < 0.05). Univariate and multivariate regression analyses showed that age and a decline in HBV RNA levels at week 12 were independent predictors of HBeAg serological conversion. The area under the ROC curve (AUROC) of HBV RNA decline at week 12 was 0.677(95% CI∶0.549-0.806, P = 0.012), which was significantly better than the same period of AUROC of HBV DNA (0.657, 95% CI∶0.527-0.788, P = 0.025) and HBsAg (0.660, 95% CI∶0.526-0.795, P = 0.023) decline. HBV RNA levels decreased (>1.385 log10 copies/ml) at week 12, with a positive predictive value of 53.2%, a negative predictive value of 72.2%, a sensitivity of 77.4%, and a specificity of 57.9% for HBeAg seroconversion. Conclusion: HBV RNA level lowering during the 12th week of antiviral therapy can serve as an early predictor marker for HBeAg serological conversion in children with chronic hepatitis B.
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Affiliation(s)
- J J Xu
- Hebei North University, Zhangjiakou 075000, China the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - C Shi
- the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - X Q Hong
- Hebei North University, Zhangjiakou 075000, China the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - F Chu
- the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - Q K Bai
- Hebei North University, Zhangjiakou 075000, China
| | - J Wang
- Hebei North University, Zhangjiakou 075000, China
| | - Y M Shi
- The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou 450000, China
| | - Z X Guo
- Hebei North University, Zhangjiakou 075000, China
| | - X R Zhang
- Hebei North University, Zhangjiakou 075000, China
| | - F C Wang
- the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - M Zhang
- the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
| | - X T Chang
- Hebei North University, Zhangjiakou 075000, China
| | - X C Zhang
- Hebei North University, Zhangjiakou 075000, China
| | - Y W Zhong
- the Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
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Zhong YW, Fan YY, Zuo ZQ, Shu RG, Liu YQ, Luan JB, Li F, Liu SS. A chromosome-level genome assembly of the parasitoid wasp Eretmocerus hayati. Sci Data 2023; 10:585. [PMID: 37673910 PMCID: PMC10482854 DOI: 10.1038/s41597-023-02450-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 08/07/2023] [Indexed: 09/08/2023] Open
Abstract
Hymenoptera is an order accounting for a large proportion of species in Insecta, among which Chalcidoidea contains many parasitoid species of biocontrol significance. Currently, some species genomes in Chalcidoidea have been assembled, but the chromosome-level genomes of Aphelinidae are not yet available. Using Illumina, PacBio HiFi and Hi-C technologies, we assembled a genome assembly of Eretmocerus hayati (Aphelinidae, Hymenoptera), a worldwide biocontrol agent of whiteflies, at the chromosome level. The assembled genome size is 692.1 Mb with a contig N50 of 7.96 Mb. After Hi-C scaffolding, the contigs was assembled onto four chromosomes with a mapping rate of > 98%. The scaffold N50 length is 192.5 Mb, and Benchmarking Universal Single-Copy Orthologues (BUSCO) value is 95.9%. The genome contains 370.8 Mb repeat sequences and total of 24471 protein coding genes. P450 gene families were identified and analyzed. In conclusion, our chromosome-level genome assembly provides valuable support for future research on the evolution of parasitoid wasps and the interaction between hosts and parasitoid wasps.
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Affiliation(s)
- Yu-Wei Zhong
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Yun-Yun Fan
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Zhang-Qi Zuo
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Run-Guo Shu
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Yin-Quan Liu
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Jun-Bo Luan
- College of Plant Protection, Shenyang Agricultural University, 110866, Shenyang, China
| | - Fei Li
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China
| | - Shu-Sheng Liu
- Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, 310058, Hangzhou, China.
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Fan YY, Zhong YW, Zhao J, Chi Y, Bouvaine S, Liu SS, Seal SE, Wang XW. Bemisia tabaci Vesicle-Associated Membrane Protein 2 Interacts with Begomoviruses and Plays a Role in Virus Acquisition. Cells 2021; 10:1700. [PMID: 34359870 PMCID: PMC8306474 DOI: 10.3390/cells10071700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/29/2021] [Accepted: 06/29/2021] [Indexed: 12/03/2022] Open
Abstract
Begomoviruses cause substantial losses to agricultural production, especially in tropical and subtropical regions, and are exclusively transmitted by members of the whitefly Bemisia tabaci species complex. However, the molecular mechanisms underlying the transmission of begomoviruses by their whitefly vector are not clear. In this study, we found that B. tabaci vesicle-associated membrane protein 2 (BtVAMP2) interacts with the coat protein (CP) of tomato yellow leaf curl virus (TYLCV), an emergent begomovirus that seriously impacts tomato production globally. After infection with TYLCV, the transcription of BtVAMP2 was increased. When the BtVAMP2 protein was blocked by feeding with a specific BtVAMP2 antibody, the quantity of TYLCV in B. tabaci whole body was significantly reduced. BtVAMP2 was found to be conserved among the B. tabaci species complex and also interacts with the CP of Sri Lankan cassava mosaic virus (SLCMV). When feeding with BtVAMP2 antibody, the acquisition quantity of SLCMV in whitefly whole body was also decreased significantly. Overall, our results demonstrate that BtVAMP2 interacts with the CP of begomoviruses and promotes their acquisition by whitefly.
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Affiliation(s)
- Yun-Yun Fan
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
| | - Yu-Wei Zhong
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
| | - Jing Zhao
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
| | - Yao Chi
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
| | - Sophie Bouvaine
- Natural Resources Institute, University of Greenwich, Chatham, Kent ME4 4TB, UK;
| | - Shu-Sheng Liu
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
| | - Susan E. Seal
- Natural Resources Institute, University of Greenwich, Chatham, Kent ME4 4TB, UK;
| | - Xiao-Wei Wang
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-Y.F.); (Y.-W.Z.); (J.Z.); (Y.C.); (S.-S.L.)
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Lei T, Zhong YW, Liu YQ. Complete mitochondrial genome of the whitefly Aleyrodes shizuokensis Kuwana (Hemiptera: Aleyrodidae), new record from Chinese mainland. Mitochondrial DNA B Resour 2021; 6:397-398. [PMID: 33659691 PMCID: PMC7872568 DOI: 10.1080/23802359.2020.1869617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The complete mitochondrial genome was determined for the whitefly Aleyrodes shizuokensis (Hemiptera: Aleyrodidae), the first record from Chinese mainland. The mitochondrial genome is 16,687 bp in length and contains 13 protein-coding genes (PCGs), 22 transfer RNAs, and two ribosomal RNAs. The overall base composition is 33.8% A, 47.0% T, 12.2% G, and 7.0% C. All PCGs start with ATN codon. COX1 ends with a T, and the other 12 PCGs use TAA or TAG as the stop codon. Gene arrangement of the 13 PCGs is identical to that of the giant whitefly Aleurodicus dugesii and greenhouse whitefly Trialeurodes vaporariorum. The resultant Bayesian inference and maximum-likelihood trees based on the sequence data of 13 PCGs support its close relationship with sugarcane whitefly Neomaskellia andropogonis.
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Affiliation(s)
- Teng Lei
- Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Yu-Wei Zhong
- Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Yin-Quan Liu
- Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
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Chen YS, Zhao YY, Zhang Y, Wang Y, Zhong YW, Zhang AQ. [Application of cervical lifting suture in hemostasis of placenta previa with increta and percreta]. Zhonghua Fu Chan Ke Za Zhi 2018; 53:459-463. [PMID: 30078255 DOI: 10.3760/cma.j.issn.0529-567x.2018.07.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To evaluate the effect of cervical lifting suture in treatment of placenta previa with increta and percreta. Methods: From January 2016 to June 2017, 65 cases (0.78%, 65/8 322) were diagnosed placenta previa with increta and percreta by prenatal ultrasonic score system and confirmed by intraoperative findings in the department of obstetrics and gynecology of Peking University Third Hospital. Totally 62 cases (0.75%, 62/8 322) were included, because 3 cases underwent hysterectomy with placenta in situ. According to ultrasonic score system, 62 cases were divided into two groups, score 5-9 group (n=42, 67.7%) and score≥10 group (n=20, 32.3%) , cervical lifting suture techniques were all performed in cesarean sections. Demographic and clinical data were collected and compared. Results: (1) There were no significant differences between two groups in age, gravidity, parity, cesarean section history ratio and gestational week of termination (all P>0.05) . (2) In score≥10 group, the median intraoperative bleeding volume was 4 000 ml (1 200-13 000 ml) , while in score 5-9 group, it was 1 600 ml (700-10 000 ml) , intraoperative blood transfusion volume was 2 000 ml (800-8 800 ml) in score≥10 group, while 1 200 ml (0-8 000 ml) in score 5-9 group. The median operation time was 240 minutes (108-1 200 minutes) in score≥10 group, significantly higher than that in score 5-9 group, which was 135 minutes (69-335 minutes; all P< 0.05). In 8 cases for hysterectomy (12.9%,8/62) , 3 cases in score 5-9 group, 5 cases in score≥10 group. (3) In score≥10 group, the rate of postoperative ICU registration was 80% and mean hospitalization time was (6.3±1.7) days, were significantly different, compared with those in score 5-9 group, which were 26%, (4.9±1.9) days. No serious postpartum complications were found in both groups, and there were no significant differences in Apgar score and weight of newborns (all P>0.05) . Conclusion: Cervical lifting suture in placenta previa with increta and percreta could significantly reduce postpartum hemorrhage and retain uterine.
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Affiliation(s)
- Y S Chen
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
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Shi YM, Zhang B, Zhang HF, Zhang M, Xu ZQ, Chen DW, Dong Y, Zhang XC, Zhong YW. [Association between interleukin-28B polymorphisms and antiviral effect in children with chronic hepatitis C]. Zhonghua Gan Zang Bing Za Zhi 2016; 24:446-448. [PMID: 27465949 DOI: 10.3760/cma.j.issn.1007-3418.2016.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- Y M Shi
- Hebei North University, Zhangjiakou 075000, China
| | - B Zhang
- 302 Military Hospital of China, Beijing 100039, China
| | - H F Zhang
- 302 Military Hospital of China, Beijing 100039, China
| | - M Zhang
- 302 Military Hospital of China, Beijing 100039, China
| | - Z Q Xu
- 302 Military Hospital of China, Beijing 100039, China
| | - D W Chen
- 302 Military Hospital of China, Beijing 100039, China
| | - Y Dong
- 302 Military Hospital of China, Beijing 100039, China
| | - X C Zhang
- Hebei North University, Zhangjiakou 075000, China
| | - Y W Zhong
- 302 Military Hospital of China, Beijing 100039, China
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Zhong YW, Di FL, Liu C, Zhang XC, Bi JF, Li YL, Wu SQ, Dong H, Liu LM, He J, Shi YM, Zhang HF, Zhang M. Hepatitis B virus basal core promoter/precore mutants and association with liver cirrhosis in children with chronic hepatitis B virus infection. Clin Microbiol Infect 2015; 22:379.e1-379.e8. [PMID: 26577140 DOI: 10.1016/j.cmi.2015.10.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 10/29/2015] [Accepted: 10/30/2015] [Indexed: 02/08/2023]
Abstract
We investigated 168 children and analysed the virological characterization and association with disease progression in children with hepatitis B virus (HBV) basal core promoter/precore (BCP/PC) mutants. Among 168 patients with HBV infection (aged 0.5-18 years old, mean 10.1), 86 of them had HBV-related liver cirrhosis (LC) and 82 had HBV-related chronic hepatitis B (CHB). A direct sequencing method was employed to determine the HBV genotypes and the mutations in BCP/PC regions. In all, 133 of them were infected with genotype C viruses (79.17%); only 35 patients (20.83%) were infected with genotype B viruses. Both LC patients and CHB patients had significantly higher ratios of genotype C when compared with the ratios of genotype B (83.7%-16.3% versus 74.4%-25.6%). For patients with CHB, the prevalence of BCP/PC wild-type viruses was 52.4%; but this was only 4.7% in patients with LC. The C1653T, T1753C, A1762T/G1764A and G1896A mutations had a significantly higher prevalence in patients with LC. Among all the patients with genotype B viruses, those with LC had lower HBV DNA levels and higher G1899A mutation frequency than patients with CHB. Among all the patients with genotype C viruses, the patients with LC had higher prevalence of C1653T, A1762T/G1764A and G1896A mutation frequency, higher hepatitis B e antigen (HBeAg) -negative rates, lower viral load, lower elevated alanine aminotransferase and lower anti-HBe positive rates than CHB patients. The HBV BCP/PC variants were more common in HBeAg-negative LC patients than in the CHB group (BCP, 53.4% versus 15.6%; PC, 18.6% versus 3.7%, respectively, p < 0.001). Patients with HBV genotype C viruses, high viral load and C1653T, A1762T/G1764A, G1896A mutant viruses, were more susceptible to developing LC.
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Affiliation(s)
- Y W Zhong
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China.
| | - F L Di
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - C Liu
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - X C Zhang
- HeBei North University, Zhangjiakou, China.
| | - J F Bi
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - Y L Li
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - S Q Wu
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - H Dong
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - L M Liu
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - J He
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - Y M Shi
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China
| | - H F Zhang
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China.
| | - M Zhang
- Institute of Infectious Diseases, Pediatric Liver Disease Therapy and Research Centre, Beijing 302 Hospital, Beijing, China.
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Zhong YW, Cheng J, Qu JH, Zhang LY, Guo J, Li XD, Xu DP. [Screening and cloning of the down-regulation gene by recombinant interferon-B using suppression subtractive hybridization technique.]. Zhonghua Shi Yan He Lin Chuang Bing Du Xue Za Zhi 2006; 20:273-5. [PMID: 17086292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
BACKGROUND To construct a subtractive cDNA library of target genes down-regulated in human hepatocarcinoma cell line HepG2 cells treated with IFNB, and clone genes of the down-regulation by IFNB using suppression subtractive hybridization (SSH) technology and bioinformatics techniques. METHODS The mRNA was isolated from HepG2 cells induced by recombinant interferon-B and 0.9 percent sodium chloride, respectively, then cDNA was synthesized. After restriction enzyme Rsa I digestion, small sizes cDNAs were obtained. Then tester cDNA was divided into two portions and each was ligated to the specific cDNA adaptor 1 and adaptor 2 respectively. After tester cDNA was hybridized with driver cDNA twice and underwent two times of nested PCR, the DNA fragment was subcloned into T/A plasmid vectors to set up the subtractive library. Amplification of the library was carried out with E.coli strain DH5a. The cDNA was sequenced and analyzed in GenBank with Blast search after PCR. RESULTS The subtractive library of genes down-regulation in HepG2 cells treated with recombination interferon-B was constructed successfully. The amplified library contained 58 positive clones. Colony PCR and sequence analysis was performed in 35 clones randomly, and the full length sequences were obtained with bioinformatics method. Altogether 12 coding sequences were obtained. CONCLUSION A subtractive cDNA library of genes down-regulation in HepG2 cells treated with IFNB using SSH technique was constructed successfully, which brings some new clues for studying the regulation mechenism of IFNB in liver cells.
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Affiliation(s)
- Y W Zhong
- Viral Hepatitis Research Center, Institute of Infectious Diseases, The No.302 Hospital of The People's Liberation Army, Beijing 100039, China. Corresponding author: ZHONG Yan-wei, E-mail: , Tel: 010-66933392
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Lun YZ, Cheng J, Zhong YW, Zhao BC. Cloning, expression and identification of the gene of human single-chain variable fragment antibody against Hepatitis B virus surface antigen. Acta Virol 2006; 50:195-200. [PMID: 17131939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Expression of single-chain variable fragment (scFv) antibodies on the surface of bacteriophage is widely used to prepare antibodies with pre-defined specificities. A phage antibody library containing the gene for scFv antibody against Hepatitis B virus surface antigen (HBsAg) was panned with HBsAg immobilized on microtiter plate wells. After five rounds of panning 30 phage clones specific to HBsAg were obtained and one selected clone was sequenced. It was found to consist of 789 bp and its amino acid sequence and specifically detected the respective antigen in the patients but not in healthy persons.
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Affiliation(s)
- Y Z Lun
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 110027, P.R. China
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Chen J, Si CW, Wang QH, Liu Y, Zhong YW, Yang JZ, Hong WG. [Cloning and sequence analysis of a gene encoding amastin from Leishmania major]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 18:30-2. [PMID: 12567469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To clone a gene encoding surface protein from Leishmania major. METHODS Using T. cruzi amastin DNA sequence as a reference, computer search was done on GenBank and dbEST databases by using BLAST path. A Leishmania major DNA library has been constructed and screened by in situ colony hybridization. RESULTS A 309nt DNA fragment from Leishmania major was found in dbEST. Leishmania major DNA library was screened using specific primers synthesized according to 309 nt DNA sequence, and a full-length coding sequence for Leishmania major amastin was cloned. The coding sequence consisted of 552 nt, and translated into 183 amino acid residues. The homology is 23.5% at amino acid sequence level between Leishmania major and T. cruzi amastins. CONCLUSION A full length amastin coding gene for Leishmania major has been cloned.
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Affiliation(s)
- J Chen
- Gene Therapy Research Center, Institute of Infectious Diseases, 302 Hospital of PLA, Beijing 100039
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