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Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

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Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion...
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Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors
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Unravelling hepatitis C virus replication from genome to function.

Brett D Lindenbach1, Charles M Rice

  • 1Center for the Study of Hepatitis C, The Rockefeller University, 1230 York Avenue, New York, New York 10021, USA.

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Scientists have made progress in understanding hepatitis C virus (HCV) despite challenges. New antiviral therapies for HCV are now in clinical trials, offering hope for treatment.

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Area of Science:

  • Virology
  • Hepatology
  • Infectious Diseases

Background:

  • Hepatitis C virus (HCV) discovery over 15 years ago initiated research into diagnostics, pathogenesis, and therapeutics.
  • Research faced significant hurdles due to limited host range for replication (humans/chimpanzees) and lack of efficient cell culture models.

Purpose of the Study:

  • To summarize the progress made in understanding and combating the hepatitis C virus.
  • To highlight the development of new antiviral therapies for HCV.

Main Methods:

  • Review of scientific literature on hepatitis C virus research.
  • Analysis of challenges in HCV replication and drug development.

Main Results:

  • Despite initial difficulties, significant advancements have been achieved in HCV research.
  • The first generation of antiviral drugs targeting HCV has successfully progressed to clinical trials.

Conclusions:

  • Hard-fought progress has been made in hepatitis C virus research and therapy development.
  • Emerging antiviral drugs represent a significant step forward in managing HCV infections.