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Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development

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Forkhead factor FoxO1 is essential for placental morphogenesis in the developing embryo.

Anwarul Ferdous¹, Jesse Morris, Mohammad Joynal Abedin

¹Department of Internal Medicine, Cardiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8573, USA. anwarul.ferdous@utsouthwestern.edu

Proceedings of the National Academy of Sciences of the United States of America

|September 21, 2011

Summary

Forkhead box O1 (FoxO1) is crucial for placental development. Its absence causes allantois defects, leading to embryonic lethality by disrupting the FoxO1-VCAM1 axis essential for cardiovascular formation.

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Area of Science:

Developmental biology
Molecular biology
Genetics

Background:

Forkhead box O1 (FoxO1) is a transcription factor regulating diverse cellular functions.
The specific role of FoxO1 in embryonic development, particularly placental development, is not well understood.

Purpose of the Study:

To investigate the role of FoxO1 in placental development and its impact on embryonic survival.
To elucidate the molecular mechanisms by which FoxO1 influences placental morphogenesis and cardiovascular development.

Main Methods:

Generation and analysis of FoxO1-null mouse embryos.
Morphological and cardiovascular assessments of embryos.
Quantitative RT-PCR, immunohistochemistry, and chromatin immunoprecipitation assays to analyze gene expression and protein interactions.

Main Results:

FoxO1-null embryos exhibit normal development until embryonic day 9.0 but develop a hydropic allantois and fail to fuse with the chorion.
This leads to cardiovascular malformations, increased apoptosis, and embryonic lethality around E10.5.
VCAM1 expression is significantly reduced in FoxO1-null embryos, and FoxO1 directly regulates VCAM1 transcription.

Conclusions:

FoxO1 plays an essential, previously undefined role in placental development.
A novel FoxO1-VCAM1 signaling axis is critical for placental morphogenesis.
This pathway is vital for normal cardiovascular development and embryonic viability.