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Lethal Alleles02:41

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...

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A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
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Bone phenotypes of P2 receptor knockout mice.

Isabel Orriss1, Susanne Syberg, Ning Wang

  • 1Department of Cell and Developmental Biology, University College London, London, UK.

Frontiers in Bioscience (Scholar Edition)
|May 31, 2011
PubMed
Summary

Extracellular nucleotides, acting via P2 receptors, significantly impact bone metabolism. Studies reveal diverse bone abnormalities in knockout mice, highlighting P2 receptors

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Extracellular nucleotides signal through ionotropic P2X and G-protein coupled P2Y receptors.
  • The human genome encodes 7 P2X and 8 P2Y receptor genes.
  • Genetic models, particularly knockout mice, are crucial for studying receptor function.

Purpose of the Study:

  • To investigate the role of various P2 receptors in bone metabolism.
  • To analyze bone phenotypes in knockout mice lacking specific P2 receptor genes.
  • To elucidate the mechanisms by which extracellular nucleotides regulate bone cells.

Main Methods:

  • Phenotypic analysis of knockout mice strains for P2X and P2Y receptors.
  • Examination of bone mass, formation, and resorption in genetically modified mice.
  • Comparative analysis across different gene targeting constructs and genetic backgrounds.

Main Results:

  • P2X7 knockout mice exhibited distinct bone abnormalities.
  • P2Y1 deficiency led to decreased bone mass.
  • P2Y2 deficiency resulted in increased bone mass.
  • P2Y6 deficiency was associated with reduced bone resorption.
  • P2Y13 deficiency impaired both bone formation and resorption.

Conclusions:

  • Extracellular nucleotide signaling via multiple P2 receptors plays a critical, previously underestimated role in bone metabolism.
  • Distinct P2 receptors (P2X7, P2Y1, P2Y2, P2Y6, P2Y13) influence bone homeostasis through varied mechanisms.
  • These findings implicate P2 receptors in regulating both osteoblast and osteoclast activity, offering potential therapeutic targets.