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COUP-TFs regulate eye development by controlling factors essential for optic vesicle morphogenesis.

Ke Tang1, Xin Xie, Joo-In Park

  • 1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, 77030, USA.

Development (Cambridge, England)
|February 12, 2010
PubMed
Summary

Chicken ovalbumin upstream promoter-transcription factors (COUP-TFs) are crucial for eye development, regulating progenitor cell differentiation and dorsal-ventral patterning. Loss of COUP-TFI and COUP-TFII causes severe eye defects, including coloboma and microphthalmia.

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Area of Science:

  • Developmental Biology
  • Molecular Genetics
  • Ophthalmology

Background:

  • Eye development relies on complex transcriptional networks orchestrated by secreted proteins.
  • Molecular mechanisms underlying dorsal/ventral polarity, particularly dorsal specification in the optic vesicle, remain poorly understood.
  • Chicken ovalbumin upstream promoter-transcription factors (COUP-TFI/Nr2f1 and COUP-TFII/Nr2f2) are expressed in developing murine eye progenitor cells.

Purpose of the Study:

  • To investigate the role of COUP-TFI and COUP-TFII in eye development and progenitor cell differentiation.
  • To elucidate the molecular mechanisms by which COUP-TFs regulate dorsal-ventral patterning in the optic vesicle.
  • To determine the impact of COUP-TF loss on eye morphogenesis and the expression of key developmental genes.

Main Methods:

  • Generation and analysis of COUP-TFI and COUP-TFII single-gene and double-gene conditional knockout mouse models.
  • Phenotypic analysis of ocular development, including cellular differentiation and morphology.
  • Immunohistochemistry, in situ hybridization, ChIP assays, siRNA treatment, and transient transfection in ARPE-19 cells.

Main Results:

  • COUP-TFs exhibit functional compensation in single-gene knockouts but are essential for eye morphogenesis when both are deleted.
  • Loss of COUP-TFI/TFII leads to abnormal differentiation of optic vesicle progenitor cells, resulting in retinal pigmented epithelium adopting neural retina fate and altered dorsal optic stalk development.
  • COUP-TF deficiency disrupts the expression of key developmental genes (Pax6, Otx2, Mitf, Pax2, Vax1/2) and directly impacts Pax6 and Otx2 regulation.

Conclusions:

  • COUP-TFs mediate distinct cell-intrinsic mechanisms essential for progenitor cell specification and differentiation during eye development.
  • COUP-TFs play a critical role in establishing dorsal-ventral polarity, specifically dorsalization, of the developing eye.
  • Dysregulation of COUP-TFs leads to congenital ocular abnormalities such as colobomata and microphthalmia.