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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...
Viruses of Archaea01:29

Viruses of Archaea

Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
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’...
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...
Subviral Agents01:29

Subviral Agents

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...
Rous Sarcoma Virus (RSV) and Cancer01:03

Rous Sarcoma Virus (RSV) and Cancer

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.
RSV is a retrovirus that contains two copies of a plus-strand  RNA genome. Its genome consists of four main open...

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Related Experiment Video

Updated: Jun 25, 2026

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
08:56

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes

Published on: July 27, 2018

Geminiviruses.

H Jeske1

  • 1Institute of Biology, Department of Molecular Biology and Plant Virology, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany. holger.jeske@bio.uni-suttgart.de

Current Topics in Microbiology and Immunology
|February 24, 2009
PubMed
Summary

Plant pathogenic geminiviruses are a growing global threat. This review summarizes their structure, replication, and interaction with host plants, comparing them to animal viruses.

Area of Science:

  • Plant virology
  • Molecular biology
  • Genomics

Background:

  • Geminiviruses are plant-pathogenic viruses with increasing global prevalence.
  • Significant scientific interest has focused on geminiviruses over the last 30 years.
  • Understanding geminivirus biology is crucial for agricultural and plant health sectors.

Purpose of the Study:

  • To provide a comprehensive overview of geminivirus biology.
  • To highlight key aspects of geminivirus structure, replication, and host interactions.
  • To offer a comparative perspective for animal virologists by contrasting geminiviruses with polyomaviruses and circoviruses.

Main Methods:

  • Literature review and synthesis of existing research on geminiviruses.
  • Comparative analysis of geminivirus biology with related animal viruses (polyomaviruses, circoviruses).

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Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm
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Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm

Published on: April 12, 2017

Related Experiment Videos

Last Updated: Jun 25, 2026

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
08:56

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes

Published on: July 27, 2018

Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm
11:12

Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm

Published on: April 12, 2017

  • Focus on molecular mechanisms including replication, recombination, transcription, and gene silencing.
  • Main Results:

    • Geminiviruses possess distinct virion and genome structures.
    • Their molecular biology involves complex replication, recombination, and transcription strategies.
    • Geminivirus transport in plants and host immune responses are dynamic processes.
    • Key similarities and differences exist when compared to polyomaviruses and circoviruses.

    Conclusions:

    • Geminiviruses represent a significant and expanding area of virological research.
    • A thorough understanding of geminivirus molecular biology and host interactions is essential.
    • Comparative virology aids in understanding viral evolution and function across different hosts.