Involvement of an AFP1-binding site in cell-specific transcription of the pre-S1 region of the human hepatitis B virus surface antigen gene.

Nucleic Acids Research
K NakaoT Tamaoki

Abstract

Human hepatitis B virus infection is characterized by a high degree of hepatotropism which may be due to the dependency of viral genes on specific host factors for their expression. To learn more about such a requirement and the molecular basis of the viral tissue tropism we analyzed the promoter function in the pre-S1 region of the surface antigen gene. DNase I footprinting and competition gel retardation assays showed that a sequence with an AT-rich core (AT motif) in the pre-S1 promoter region interacts with AFP1, a hepatoma nuclear factor that binds to the alpha-fetoprotein enhancer and promoter. Functional analysis of the pre-S1 AT motif by transient transfection assays showed that this element is important in cell-specific transcriptional initiation. These results suggest that AFP1 may be one of the factors determining the liver specificity of human hepatitis B virus.

References

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Citations

Oct 27, 2007·Nucleic Acids Research·Larry N SinghSridhar Hannenhalli
Feb 2, 2011·Liver International : Official Journal of the International Association for the Study of the Liver·Iddo Bar-YishayAmir Shlomai
Apr 1, 1993·Current Opinion in Genetics & Development·L P Hansen, G R Crabtree
Jul 1, 1992·Clinical Microbiology Reviews·M Feitelson

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