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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Notch Signaling Pathway03:14

Notch Signaling Pathway

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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
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Yeast Signaling01:28

Yeast Signaling

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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
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Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
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Related Experiment Videos

Signalling pathways in the pathogenesis of Cryptococcus.

Lukasz Kozubowski1, Soo Chan Lee, Joseph Heitman

  • 1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.

Cellular Microbiology
|January 28, 2009
PubMed
Summary
This summary is machine-generated.

Fungi use complex signaling pathways to interact with their environment and cause disease. Understanding these fungal communication systems is key to treating infections like cryptococcosis.

Related Experiment Videos

Area of Science:

  • Microbiology
  • Molecular Biology
  • Mycology

Background:

  • Fungi rely on intricate signaling systems for environmental sensing, growth, and virulence.
  • Key pathways include protein kinase A/cyclic AMP (cAMP), protein kinase C (PKC)/mitogen-activated protein kinase (MAPK), lipid signaling, and calcium-calcineurin.
  • The human pathogen Cryptococcus neoformans employs sophisticated signaling to survive host defenses and cause severe infections.

Purpose of the Study:

  • To investigate the complex signaling networks governing the virulence of Cryptococcus neoformans.
  • To elucidate how fungal communication pathways contribute to pathogenic traits.

Main Methods:

  • Analysis of known fungal signaling pathways.
  • Review of literature on Cryptococcus neoformans virulence factors.

Main Results:

  • Signaling pathways orchestrate critical virulence traits in C. neoformans, such as melanin production, capsule formation, and thermotolerance.
  • These networks are essential for fungal survival and pathogenesis in the human host.

Conclusions:

  • Understanding fungal signaling networks is crucial for developing strategies against cryptococcosis.
  • Targeting these pathways could lead to improved treatments, diagnostics, and prevention of fungal infections.