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Cell-type specific roles for PTEN in establishing a functional retinal architecture
Robert Cantrup1, Rajiv Dixit, Elena Palmesino
1Department of Biochemistry and Molecular Biology, Hotchkiss Brain Institute, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada.
Plos One
|March 10, 2012
Summary
The phosphatase PTEN (phosphatase and tensin homolog) is crucial for retinal cell positioning and mosaic formation. Loss of PTEN disrupts retinal cell architecture and visual function.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- The retina's precise 3D architecture enables complete visual field sampling.
- Retinal neurons are organized into layers radially and form mosaics tangentially.
- Molecular cues for tangential cell positioning are poorly understood.
Purpose of the Study:
- Investigate the role of PTEN phosphatase in retinal architecture.
- Understand PTEN's function in tangential plane cell positioning.
Main Methods:
- Generated retina-specific Pten knock-out models.
- Analyzed retinal cell positioning, morphology, and electrophysiology.
- Examined PTEN expression in Dscam-mutant mice.
Main Results:
- Pten knock-out caused retinal cell hypertrophy and inner plexiform layer expansion.
- Mosaic spacing and neurite arborization were aberrant in Pten mutants.
- Pten mutation led to reduced optokinetic spatial acuity and asynchronous amacrine firing.
Conclusions:
- PTEN regulates positioning and arborization of retinal mosaic cells.
- PTEN functions independently of Dscam in early development.
- PTEN is integral to a novel retinal cell positioning pathway.
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