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Related Concept Videos

Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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 retrovirus to...
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Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
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Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Viruses with RNA Genomes

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...
Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
pre-mRNA Processing02:01

pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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In Vitro Transcribed RNA-based Luciferase Reporter Assay to Study Translation Regulation in Poxvirus-infected Cells
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Published on: May 1, 2019

RNA processing in the polyoma virus life cycle.

Yingqun Huang1, Gordon G Carmichael

  • 1Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, 300 George Street, New Haven, CT 06511, USA.

Frontiers in Bioscience (Landmark Edition)
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

Polyoma virus gene regulation offers novel insights. Mechanisms controlling the switch from early to late gene expression involve RNA processing and transcription changes after viral DNA replication.

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Last Updated: Jun 22, 2026

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Published on: May 1, 2019

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Published on: July 13, 2019

Area of Science:

  • Molecular Biology
  • Virology
  • Gene Regulation

Background:

  • Polyoma virus gene regulation presents unique mechanisms.
  • Understanding viral gene expression is crucial in virology.

Purpose of the Study:

  • To review RNA synthesis and processing regulation during polyoma infection.
  • To highlight novel aspects of polyoma virus gene regulation.

Main Methods:

  • Review of existing literature on polyoma virus.
  • Analysis of RNA synthesis and processing mechanisms.

Main Results:

  • The switch from early to late gene expression is key.
  • Mechanisms involve changes in transcription elongation and polyadenylation.
  • RNA processing, including dsRNA formation and editing, plays a role.

Conclusions:

  • Polyoma virus provides a model for studying complex gene regulation.
  • Novel regulatory strategies are employed during viral infection.