Orthohepadnaviruses are a group of DNA viruses that belong to the family Hepadnaviridae. They are known for their ability to infect hepatocytes, which are the main cells of the liver, and cause chronic infections in various mammalian species, including humans. The name "orthohepadnaviruses" is derived from their unique characteristics and origins within this viral family.
These viruses have a circular, partially double-stranded DNA genome. Their genome encodes several proteins that are essential for viral replication, including a viral polymerase, core antigen, and envelope proteins. The replication of orthohepadnaviruses occurs via an RNA intermediate, which is an intermediate step during the production of new viral particles.
Orthohepadnaviruses are primarily transmitted through blood and other bodily fluids, such as semen or saliva. They can be spread through various routes, including intravenous drug use, sexual contact, or from mother to child during childbirth. Once inside the host, the virus can establish a chronic infection that can persist for several years or even a lifetime.
Chronic infections with orthohepadnaviruses can lead to liver diseases, including cirrhosis and hepatocellular carcinoma (HCC), which is a type of liver cancer. These viruses are responsible for the majority of cases of chronic hepatitis B infections in humans.
Despite the development of effective vaccines and antiviral therapies, orthohepadnaviruses still pose a significant public health concern worldwide. Ongoing research is focused on unravelling the molecular mechanisms of viral replication and pathogenesis, as well as improving diagnostic techniques and developing more targeted antiviral treatments.
The word "Orthohepadnaviruses" has a scientific and taxonomical etymology. It is a term used in virology to classify a genus of viruses within the family Hepadnaviridae, which includes the Hepatitis B virus.
The word can be broken down into two parts:
1. Ortho-: The prefix "ortho-" is derived from the Greek word "orthos", meaning "straight" or "correct". In the context of virology, "ortho-" is used to denote viruses that have a certain structure, characteristics, or behavior that is considered standard or typical.
2. Hepadnaviruses: Hepadnaviruses are a family of viruses that specifically infect the liver. The term "hepat"- is derived from the Greek word for "liver", while "-navirus" is a common suffix used to denote a virus.