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Clathrin adaptor AP-2 is essential for early embryonal development.

Takashi Mitsunari1, Fubito Nakatsu, Noriko Shioda

  • 1Laboratory for Epithelial Immunobiology, Research Center for Allergy and Immunology, RIKEN, 1-7-22 Suehiro, Tsurumi, Yokohama, Kanagawa 230-0045, Japan.

Molecular and Cellular Biology
|October 18, 2005
PubMed
Summary

Adaptor protein AP-2 is essential for early mouse development. Its absence, caused by mu2 subunit gene disruption, leads to embryonic lethality before day 3.5, highlighting AP-2

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Area of Science:

  • Cell biology
  • Molecular biology
  • Developmental biology

Background:

  • Adaptor protein (AP) complexes, including AP-1, AP-2, AP-3, and AP-4, are crucial for vesicle formation and cargo sorting in post-Golgi trafficking.
  • AP-2 specifically mediates rapid endocytosis of plasma membrane receptors in cultured mammalian cells.

Purpose of the Study:

  • To investigate the essentiality of AP-2 function in vivo within a whole mammalian organism.
  • To determine the developmental role of the mu2 subunit of AP-2.

Main Methods:

  • Targeted gene disruption of the mu2 subunit of AP-2 in mice.
  • Analysis of heterozygous and homozygous mutant embryos derived from intercrossed heterozygotes.

Main Results:

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  • mu2 heterozygous mutant mice were viable and exhibited a normal phenotype.
  • No mu2 homozygous mutant embryos were detected at the blastocyst stage (E3.5).
  • mu2-deficient embryos demonstrated lethality prior to E3.5.

    • Conclusions:

    • AP-2 is indispensable for early embryonic development in mammals.
    • The lethality of mu2-deficient embryos suggests a critical role for AP-2 in early cell viability or developmental processes.