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Related Concept Videos

Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Leaky Scanning02:28

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...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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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 26, 2026

A Seamless Cloning Approach for Porcine Reproductive and Respiratory Syndrome Virus Expression Vector Construction
04:18

A Seamless Cloning Approach for Porcine Reproductive and Respiratory Syndrome Virus Expression Vector Construction

Published on: May 17, 2024

[Porcine circovirus 2 (PCV2)--associations between sequence, function and virulence].

Gerald Reiner1, Hermann Willems

  • 1Klinik für Schweine am Klinikum Veterinärmedizin, Justus-Liebig-Universität Giessen. gerald.reiner@vetmed.uni-giessen.de

DTW. Deutsche Tierarztliche Wochenschrift
|December 31, 2008
PubMed
Summary

Currently, no molecular markers definitively link Porcine Circovirus type 2 (PCV2) sequence to virulence. Quantitative factors remain crucial for diagnosing and controlling PCV2-associated diseases (PCVD).

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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors

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Last Updated: Jun 26, 2026

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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors
06:02

Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors

Published on: September 13, 2018

Area of Science:

  • Veterinary Virology
  • Molecular Pathogenesis
  • Genomics

Context:

  • Porcine Circovirus type 2 (PCV2) associated diseases (PCVD) present spatio-temporal variations on farms.
  • Practitioners debate the influence of distinct, potentially virulent PCV2 strains on disease presentation.

Purpose:

  • To review functional elements of the PCV2 genome and their role in pathogenesis.
  • To discuss strain variability and discrepancies between phylogenetic analysis and virulence.

Summary:

  • The review examines PCV2 genome elements and their pathogenic significance.
  • Inconsistent associations between PCV2 phylogeny and virulence-determining sequences are presented.
  • No reliable molecular markers for PCV2 virulence currently exist.

Impact:

  • Highlights the lack of molecular markers for PCV2 virulence.
  • Emphasizes that quantitative considerations are paramount for PCVD diagnosis, prognosis, prophylaxis, and control.