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Updated: Feb 12, 2026

Methylnitrosourea MNU-induced Retinal Degeneration and Regeneration in the Zebrafish: Histological and Functional Characteristics

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PAR-Complex and Crumbs Function During Photoreceptor Morphogenesis and Retinal Degeneration.

Franck Pichaud¹

¹Medical Research Council, Laboratory for Molecular Cell Biology, University College London, London, United Kingdom.

Frontiers in Cellular Neuroscience

|April 14, 2018

Summary

The fly photoreceptor

Keywords:

Crumbs complex Drosophila melanogaster PAR complex cell polarity epithelial cells neuroepithelial cells retina sensory neurons

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Simultaneous Whole-cell Recordings from Photoreceptors and Second-order Neurons in an Amphibian Retinal Slice Preparation

Published on: June 1, 2013

Area of Science:

Neuroscience
Cell Biology
Genetics

Background:

Fly photoreceptors serve as a model for sensory neuron development and retinal degeneration.
Understanding photoreceptor assembly aids research into cell polarity, trafficking, and human retinal diseases.
The PAR complex (Cdc42-PAR6-aPKC-Bazooka) and Crumbs (Crb) are crucial for photoreceptor morphogenesis.

Purpose of the Study:

To investigate the roles of the PAR complex and Crumbs in fly photoreceptor development.
To explore the involvement of Crumbs in protecting photoreceptors from light-induced degeneration.
To highlight the fly photoreceptor as a model for human retinal pathologies linked to Crumbs1 mutations.

Main Methods:

Utilized the fly photoreceptor as a model system.
Studied the function of the PAR complex and Crumbs protein.
Investigated mechanisms of polarized cell morphogenesis and intracellular trafficking.

Main Results:

The PAR complex and Crumbs orchestrate the differentiation of the apical membrane and zonula adherens.
These proteins enable photoreceptor assembly into a neuro-epithelial lattice.
Crumbs protects fly photoreceptors from light-induced degeneration, involving Rhodopsin trafficking.

Conclusions:

The fly photoreceptor is a valuable model for studying cell polarity and retinal degeneration.
Crumbs plays a dual role in photoreceptor development and protection against degeneration.
Findings offer insights into human retinal diseases caused by Crumbs1 gene mutations.