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Viruses with RNA Genomes

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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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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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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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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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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’...
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Human telomerase reverse transcriptase supports respiratory syncytial virus replication.

HoangDinh Huynh1, Chien-Ting Wu2, Jeffrey S Kahn3,4

  • 1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA.

Communications Biology
|April 10, 2026
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Summary
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Targeting host factors essential for respiratory syncytial virus (RSV) replication offers a novel therapeutic strategy. Inhibiting human telomerase, RNA helicase eIF4A, or nuclear transport reduces viral production, bypassing resistance issues.

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Area of Science:

  • Virology
  • Molecular Biology
  • Host-Pathogen Interactions

Background:

  • Respiratory syncytial virus (RSV) is a major global respiratory pathogen in young children.
  • Current strategies like vaccines and monoclonal antibodies face challenges, and antiviral resistance is a significant hurdle.
  • Targeting host cellular factors essential for viral replication presents an alternative approach to overcome viral mutations.

Purpose of the Study:

  • To investigate the feasibility of targeting host cellular factors for combating RSV replication.
  • To identify specific host enzymes and functions critical for RSV replication.

Main Methods:

  • Inhibition of human telomerase activity.
  • Targeting of RNA helicase eIF4A.
  • Interference with nuclear transport receptors.

Main Results:

  • Inhibition of human telomerase significantly reduced or abolished RSV protein production.
  • RNA helicase eIF4A was found to be essential for RSV protein and progeny production.
  • Targeting nuclear transport receptors decreased RSV RNA and protein synthesis, indicating a role for the host nucleus in viral replication.

Conclusions:

  • Inhibiting host cellular functions crucial for RSV replication is a promising strategy to combat viral infections.
  • This host-targeting approach can circumvent the development of viral resistance often seen with virus-specific therapies.