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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Subviral Agents01:29

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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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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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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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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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Related Experiment Video

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Large-scale Production of Recombinant RNAs on a Circular Scaffold Using a Viroid-derived System in Escherichia coli
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Current view and perspectives in viroid replication.

Ying Wang1

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This summary is machine-generated.

Viroids are small, circular RNAs that infect plants by hijacking host cell machinery. Studying viroid RNA structure and replication mechanisms reveals fundamental insights into RNA biology and host-pathogen interactions.

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Area of Science:

  • Plant pathology
  • Molecular biology
  • RNA biology

Background:

  • Viroids are noncoding, single-stranded circular RNAs infecting plants.
  • Their noncoding nature necessitates harnessing host machinery for replication.
  • Viroids offer a model for studying RNA structure-function and cellular RNA machinery.

Purpose of the Study:

  • To review current knowledge on viroid RNA structures and replication mechanisms.
  • To highlight recent discoveries in viroid-host interactions.
  • To outline future research directions in viroid pathogenesis.

Main Methods:

  • Review of existing literature on viroid biology.
  • Analysis of RNA structure-function relationships in viroid replication.
  • Discussion of enzymatic mechanisms in viroid transcription, cleavage, and ligation.

Main Results:

  • Two viroid families, Pospiviroidae and Avsunviroidae, share a common RNA-based rolling-circle replication mechanism.
  • Viroid RNA structures play regulatory roles in replication.
  • Multiple host and viroid-encoded enzymes are critical for replication steps.

Conclusions:

  • Viroid replication involves intricate RNA structure-function interplay and host machinery exploitation.
  • Continued research will deepen understanding of host-viroid interactions and pathogenesis.
  • Viroid research provides fundamental insights into RNA biology and cellular processes.