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Updated: Aug 19, 2026

Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos
08:43

Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos

Published on: June 6, 2016

Requirement of the MAP kinase signaling pathways for mouse preimplantation development

Momoko Maekawa1, Takuya Yamamoto, Takuji Tanoue

  • 1Department of Cell and Developmental Biology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.

Development (Cambridge, England)
|March 18, 2005
PubMed

Insights

This study identifies key genes regulating early mammalian development by examining mitogen-activated protein (MAP) kinase pathways. Inhibition of JNK or p38 pathways, but not ERK, disrupts blastocyst cavity formation, revealing crucial gene targets.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Genomics

Background:

  • Mammalian preimplantation development is critical for establishing a new organism.
  • Essential genes regulating early development, including compaction and blastocyst formation, remain largely unknown.
  • Mitogen-activated protein (MAP) kinase signaling pathways are implicated in cellular regulation.

Purpose of the Study:

  • To investigate the role of MAP kinase pathways in mammalian preimplantation development.
  • To identify specific genes regulated by these pathways during early development.
  • To elucidate the molecular mechanisms underlying blastocyst formation.

Main Methods:

  • Inhibition of JNK, p38, and ERK MAP kinase pathways.
  • Microarray analysis to assess gene expression changes.
  • Small interfering RNA (siRNA) to downregulate candidate genes.

Main Results:

  • Inhibition of JNK or p38 pathways, but not ERK, impaired blastocyst cavity formation.
  • JNK and p38 pathways are active during mouse preimplantation development.
  • Microarray analysis identified 156 genes sensitive to JNK/p38 inhibition but not ERK inhibition.
  • Ten of these genes showed altered expression upon JNK or p38 inhibition, including those involved in pattern formation.
  • siRNA-mediated downregulation of these ten genes caused abnormal cavity formation.

Conclusions:

  • JNK and p38 MAP kinase pathways play critical roles in mammalian preimplantation development.
  • A specific set of 10 genes, sensitive to JNK/p38 inhibition, are key regulators of blastocyst cavity formation.
  • Further investigation of these candidate genes will illuminate the molecular mechanisms of early development.

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