Related Experiment Video

Updated: Aug 4, 2026

The Nematode Caenorhabditis Elegans - A Versatile In Vivo Model to Study Host-microbe Interactions
11:58

The Nematode Caenorhabditis Elegans - A Versatile In Vivo Model to Study Host-microbe Interactions

Published on: October 18, 2017

COS-l, a putative two-component histidine kinase of Candida albicans, is an in vivo virulence factor

C P Selitrennikoff1, L Alex, T K Miller

  • 1University of Colorado Health Sciences Center, Department of Cellular and Structural Biology, Denver 80262, USA. claude.selitrennikoff@uchsc.edu

Medical Mycology
|March 29, 2001
PubMed

Insights

Candida albicans COS-1 gene disruption reduced its virulence in mice, suggesting it is a key factor for fungal infection and a potential target for new antifungal drugs.

Area of Science:

  • Medical Mycology
  • Molecular Biology
  • Pathogen Virulence

Background:

  • Candida albicans is a major human fungal pathogen.
  • Histidine kinases are crucial signaling molecules in fungi, plants, and bacteria.
  • Understanding C. albicans virulence factors is key to developing new antifungal therapies.

Purpose of the Study:

  • To investigate the role of the histidine kinase gene COS-1 in Candida albicans.
  • To determine if COS-1 is essential for fungal growth or drug resistance.
  • To evaluate the contribution of COS-1 to C. albicans virulence in a mammalian model.

Main Methods:

  • Construction of homozygous deletion and hemizygous reconstituted strains of the COS-1 gene in C. albicans.
  • Assessment of fungal growth in various liquid media.
  • Testing antifungal drug resistance and sensitivity.
  • Evaluation of virulence in a systemic murine model of candidosis.

Main Results:

  • The COS-1 deletion and reconstituted strains showed no growth defects in liquid media.
  • No altered resistance or sensitivity to antifungal drugs was observed.
  • The COS-1 homozygous disruption strain exhibited significantly reduced virulence in the murine candidosis model.

Conclusions:

  • The COS-1 gene is not essential for C. albicans growth or antifungal drug response.
  • COS-1 is an important in vivo virulence factor for C. albicans.
  • COS-1 represents a potential novel target for developing new antifungal drugs.

More Related Videos

An Ex vivo Assay to Study Candida albicans Hyphal Morphogenesis in the Gastrointestinal Tract07:42

An Ex vivo Assay to Study Candida albicans Hyphal Morphogenesis in the Gastrointestinal Tract

Published on: July 1, 2020

Use of In Vivo Imaging to Screen for Morphogenesis Phenotypes in Candida albicans Mutant Strains During Active Infection in a Mammalian Host09:24

Use of In Vivo Imaging to Screen for Morphogenesis Phenotypes in Candida albicans Mutant Strains During Active Infection in a Mammalian Host

Published on: October 12, 2022

Related Concept Videos

Adherens Junctions01:24

Adherens Junctions

Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...
Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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...
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...
Candidiasis01:20

Candidiasis

Candidiasis is a fungal infection caused by opportunistic species of Candida. It can affect various anatomical sites, including the skin, oral cavity, nails, and genitourinary tract. Among its forms, vaginal candidiasis is the most common type of mucosal infection. It typically results from the overgrowth of Candida albicans in the vaginal mucosa. Under normal conditions, C. albicans exists as a commensal organism within the vaginal microbiota, regulated by the dominance of lactobacilli, which...