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Related Concept Videos

Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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The DNA Helix01:16

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The DNA Helix01:07

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...

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Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo
11:44

Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo

Published on: September 18, 2014

Intracellular DNA recognition.

Veit Hornung1, Eicke Latz

  • 1Institute for Clinical Chemistry and Pharmacology, University Hospital, University of Bonn, Bonn, Germany. veit.hornung@uni-bonn.de

Nature Reviews. Immunology
|January 26, 2010
PubMed
Summary
This summary is machine-generated.

This review examines how cells identify foreign DNA to trigger protective immune responses. It highlights the specific molecular pathways that detect DNA within different parts of the cell and explains how these signals lead to inflammation, antiviral defenses, and programmed cell death.

Keywords:
innate immunityantiviral responsepyroptosiscytokine maturation

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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
08:58

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells

Published on: September 2, 2019

Area of Science:

  • Immunology and intracellular DNA recognition mechanisms
  • Molecular biology of innate immune signaling

Background:

No prior work had resolved the full complexity of how diverse organisms sense genetic material to identify pathogens. That uncertainty drove researchers to investigate the evolutionary origins of these protective surveillance systems. Prior research has shown that detecting foreign nucleic acids serves as a primary warning signal for host cells. This gap motivated a deeper look into the specific molecular pathways involved in these detection events. It was already known that various cellular compartments participate in identifying potential threats. However, the precise coordination between these compartments remained poorly understood until recently. This review addresses the mechanisms by which cells distinguish between self and non-self genetic information. Understanding these processes provides a clearer picture of how innate immunity maintains host integrity against microbial invasion.

Purpose Of The Study:

The aim of this review is to synthesize recent progress in understanding the molecular mechanisms by which DNA activates cells. This work addresses the specific problem of how host organisms detect and respond to foreign genetic material. The authors seek to clarify the signaling pathways that link DNA sensing to inflammation and antimicrobial immunity. This motivation stems from the need to understand how cells distinguish between self and non-self nucleic acids. The review explores how different cellular compartments contribute to the overall detection process. By examining these pathways, the authors intend to provide a comprehensive overview of current knowledge. They investigate how these surveillance systems have evolved to operate effectively in various cell types. This study ultimately aims to map the connection between DNA detection and the resulting cellular responses, such as cytokine release and cell death.

Main Methods:

The review approach involves a comprehensive synthesis of recent literature regarding molecular sensing of genetic material. Investigators examined studies detailing how cells identify foreign nucleic acids within various internal environments. This analysis focused on the signaling cascades that translate detection into functional immune responses. The authors utilized a comparative framework to evaluate findings across different cell types and organisms. They prioritized research that clarified the link between DNA sensing and the induction of inflammatory pathways. This methodology allowed for the integration of data concerning antiviral responses and programmed cell death. The review process also incorporated evidence on the maturation of specific cytokines following DNA exposure. By synthesizing these diverse reports, the authors constructed a unified model of intracellular surveillance.

Main Results:

Key findings from the literature indicate that DNA detection serves as a primary strategy for identifying infectious agents. The authors report that these sensing pathways operate effectively across a wide range of biological systems. Evidence shows that DNA triggers diverse outcomes, including the activation of antiviral defenses and pyroptotic cell death. The literature confirms that these responses are often accompanied by the maturation and release of active interleukin-1beta. Researchers have established that the cellular location of the DNA stimulus dictates the specific nature of the immune response. Data suggest that these mechanisms are highly conserved, reflecting their importance in host defense. The synthesis of recent studies reveals that DNA sensing is a multi-layered process involving distinct molecular components. These results demonstrate that the host utilizes these pathways to maintain integrity against microbial threats.

Conclusions:

The authors synthesize evidence showing that DNA sensing pathways are highly conserved across diverse biological systems. They highlight that these mechanisms trigger robust inflammatory responses to neutralize potential threats effectively. The review demonstrates that compartmentalized detection allows for specialized cellular outcomes based on the location of the stimulus. Synthesis and implications suggest that antiviral signaling and programmed cell death are tightly linked to DNA recognition. The authors propose that the maturation of specific cytokines is a direct consequence of these intracellular detection events. They emphasize that these pathways are essential for mounting a coordinated antimicrobial defense. The findings underscore the versatility of the host response to various types of genetic triggers. This synthesis clarifies how cellular surveillance systems integrate signals to maintain homeostasis during infection.

According to the authors, DNA recognition triggers inflammation, antiviral responses, and pyroptosis. This process involves the maturation and release of interleukin-1beta, which acts as a key signaling molecule to coordinate the host immune defense against invading pathogens.

The researchers identify various cellular compartments as sites for DNA sensing. These distinct locations allow the host to initiate specific immune programs, such as the activation of antiviral pathways or the induction of programmed cell death, depending on where the genetic material is detected.

The authors propose that the evolution of these surveillance systems is necessary for distinguishing between self and non-self genetic material. This evolutionary adaptation ensures that cells can effectively identify infectious agents while avoiding damage to the host's own cellular components.

The review highlights that the maturation of interleukin-1beta is a critical component of the inflammatory response. This cytokine release is linked to pyroptotic cell death, which serves to eliminate infected cells and alert the surrounding immune environment to the presence of a threat.

The researchers describe how DNA activates cells to induce antimicrobial immunity. This phenomenon involves a series of molecular events that translate the presence of foreign genetic material into a functional, protective response that limits the spread of microbial infections.

The authors imply that understanding these molecular pathways could clarify how dysregulated DNA sensing contributes to inflammatory diseases. They suggest that the precise control of these signaling cascades is vital for preventing excessive tissue damage during an immune reaction.