Liu Y, Cheng J, Wang L, Wang JJ, Lu YY, Li K. Cloning and identification of human gene 1 transactivated by hepatitis B virus X antigen.
Shijie Huaren Xiaohua Zazhi 2003;
11:1107-1113. [DOI:
10.11569/wcjd.v11.i8.1107]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM
To study the transactivation effects of HBxAg, and clone the target genes of HBxAg transactivating effects, in order to help understand the mechanism of pathogenesis of HBxAg.
METHODS
Polymerase chain reaction (PCR) was employed to amplify the coding sequence of HBxAg. The hepatoblastoma cell HepG2 was transfected by pcDNA3.1(-) and pcDNA3.1(-)-X, respectively. Total mRNA was purified from the HepG2 cells transfected and suppression subtractive hybridization(SSH) method was used to analyze the differentially expressed DNA sequence between the two groups. The sequences were searched for homologous DNA sequence from GenBank. The new DNA sequence was confirmed and the full-length coding sequence was identified according to the Kozak rule and the existence of polyadenyl signal sequences. Reverse transcription PCR (RT-PCR)was used to amplify the new gene by using mRNA from HepG2 cell as the template. The coding sequence for the new gene was deduced according to the nucleotide sequence.
RESULTS
PCR technique was employed to amplify the coding sequence for HBxAg by using pCP10 plasmid containing whole HBV genome as the template. The recombinant plasmid expressing HBxAg was confirmed by restriction enzyme digestion and sequencing. HepG2 cells were transfected with pcDNA3.1(-) and pcDNA3.1(-)-X by lipofectamine, respectively. Total mRNA was purified from transfected HepG2 cell, and suppression subtractive hybridization method was used for the screening and identification of differentially expressed genes by these two cell groups. After sequencing, each DNA sequence was compared with the genes deposited in the GenBank and the new gene with no homology with known genes in this database was identified. Electric polymerase chain reaction was conducted for the cloning of the full-length DNA of the new gene and in conjunction with Kozak rule and the existence of polyadenyl signal sequence. RT-PCR technique was used to amplify the new gene, named as XTP1, from the mRNA of HepG2 cells. The sequence for the XTP1 gene was deposited into GenBank, and the accession number is AF488828.
CONCLUSION
A new gene named XTP1 which is transac-tivated by hepatitis B virus X protein has been successfully cloned by molecular biological methods. These results pave the way for the study of the molecular mechanism of HBxAg transactivating effects and the development of new therapy for chronic hepatitis B.
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