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The structure of hepatitis B virus. Hepatitis B virus is a member of the Hepadnavirus family. [11] The virus particle, called Dane particle [12] (), consists of an outer lipid envelope and an icosahedral nucleocapsid core composed of protein.
The structure of hepatitis B virus. Hepatitis B virus (HBV) is a member of the hepadnavirus family. [39] The virus particle consists of an outer lipid envelope and an icosahedral nucleocapsid core composed of core protein. These virions are 30–42 nm in diameter.
HBeAg is a hepatitis B viral protein, produced by the HBcAg reading frame. It is an indicator of active viral replication ; this means the person infected with Hepatitis B can likely transmit the virus on to another person (i.e. the person is infectious).
Although liver diseases transmissible among human populations were identified early in the history of medicine, the first known hepatitis with a viral etiological agent was Hepatitis A, in the picornaviridae family. Hepatitis B Virus (HBV) was identified as an infection distinct from Hepatitis A through its contamination of yellow fever vaccine.
Hepatitis D is caused by the hepatitis D virus (HDV), or hepatitis delta virus; it belongs to the genus Deltavirus. HDV is similar to a satellite virus as it can only propagate in the presence of the hepatitis B virus, depending on the helper function of HBV for its replication and expression. It has no independent life cycle, but can survive ...
The genome organisation of HBV; the genes overlap. ORF X, in yellow, encodes HBx. HBx is a hepatitis B viral protein. [1] [2] It is 154 amino acids long and interferes with transcription, signal transduction, cell cycle progress, protein degradation, apoptosis and chromosomal stability in the host.
Viral replication is nucleo-cytoplasmic. Replication follows the dsDNA(RT) replication model. DNA-templated transcription, specifically dsDNA(RT) transcription, with some alternative splicing mechanism is the method of transcription. Translation takes place by leaky scanning. The virus exits the host cell by budding, and nuclear pore export.
The orthohepadnaviruses have been divided into four distinct species, with HBV (human hepatitis B virus), WHV (woodchuck hepatitis virus), GSHV (ground squirrel hepatitis virus ), and WMHBV (woolly monkey hepatitis B virus) as the prototypes, based on the host range from a limited number of studies. From the result of molecular studies about ...