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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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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Related Experiment Video

Updated: May 7, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1&#946; in Human Monocyte-derived Dendritic Cells
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Cyclic dinucleotides and the innate immune response.

Olga Danilchanka1, John J Mekalanos1

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.

Cell
|September 3, 2013
PubMed
Summary

Cyclic dinucleotides (CDNs) are vital signaling molecules in bacteria and mammals. New research reveals their dual roles and impact on human genetic variation, opening new avenues for study.

Area of Science:

  • Biochemistry
  • Immunology
  • Genetics

Background:

  • Cyclic dinucleotides (CDNs) function as secondary signaling molecules in bacteria.
  • CDNs also act as agonists in mammalian innate immune responses.
  • Recent discoveries link these roles and suggest CDN influence on human genetic variation.

Purpose of the Study:

  • To review recent insights into cyclic dinucleotides' roles.
  • To explore the link between bacterial and mammalian CDN functions.
  • To discuss the impact of CDNs on human genetic variation.

Main Methods:

  • Literature review of recent studies on cyclic dinucleotides.
  • Synthesis of findings on CDN signaling in prokaryotes and eukaryotes.
  • Analysis of evidence for CDN influence on human genetic evolution.

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Main Results:

  • CDNs serve distinct but interconnected roles in bacteria and mammals.
  • Evidence suggests CDNs have shaped human genetic diversity.
  • This highlights a novel intersection of innate immunity and genetics.

Conclusions:

  • Cyclic dinucleotides possess multifaceted roles in biological systems.
  • Their influence extends to shaping human genetic variation.
  • Further research is needed to fully elucidate these complex interactions.