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Related Concept Videos

Viruses with RNA Genomes01:29

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...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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...
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...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
LTR Retrotransposons03:08

LTR Retrotransposons

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...

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Related Experiment Video

Updated: May 18, 2026

Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells
13:07

Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells

Published on: January 30, 2019

HIV-1 reverse transcription.

Wei-Shau Hu1, Stephen H Hughes

  • 1Viral Recombination Section, HIV Drug Resistance Program, National Cancer Institute, Frederick, Maryland 21702-1201, USA.

Cold Spring Harbor Perspectives in Medicine
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

This study overviews reverse transcription, a key step in retroviral replication. It details the structure and function of reverse transcriptase (RT), focusing on HIV-1 reverse transcriptase (RT) and factors influencing this vital process.

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Published on: November 27, 2019

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Retroviridae viruses, including HIV-1, replicate via reverse transcription.
  • Reverse transcriptase (RT) is a virally encoded enzyme essential for converting RNA genomes to DNA.

Purpose of the Study:

  • To provide an overview of reverse transcription in retroviral replication.
  • To describe the structure, function, and influencing factors of reverse transcriptase (RT).
  • To discuss the role of reverse transcription in fidelity and recombination, with an emphasis on HIV-1 RT.

Main Methods:

  • Literature review and synthesis of existing research on reverse transcription and RT.
  • Focus on HIV-1 reverse transcriptase (RT) and its associated cellular and viral factors.
  • Discussion of fidelity and recombination processes related to reverse transcription.

Main Results:

  • Reverse transcription is a critical step in the retroviral life cycle.
  • Reverse transcriptase (RT) structure and function are crucial for viral replication.
  • Cellular and viral factors significantly impact reverse transcription efficiency and accuracy.
  • Reverse transcription is integral to genetic fidelity and recombination in retroviruses.

Conclusions:

  • Reverse transcription and the enzyme reverse transcriptase (RT) are defining characteristics of Retroviridae.
  • Understanding HIV-1 RT is crucial due to its central role in AIDS pathogenesis.
  • Further research into RT, its factors, fidelity, and recombination can inform therapeutic strategies.