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Related Experiment Video

Updated: Jan 15, 2026

Whole-mount Retinal Organoid Visualization with Cellular Resolution
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Afadin sorts different retinal neuron types into accurate cellular layers.

Matthew R Lum1, Sachin Patel1, Hannah K Graham1

  • 1Department of Ophthalmology, University of California, San Francisco, San Francisco, United States.

Elife
|January 14, 2026
PubMed
Summary

Afadin is crucial for organizing retinal neurons into correct layers, ensuring proper visual processing. Its absence scrambles neuron distribution but doesn't affect cell survival or fate specification.

Keywords:
Afadindevelopmental biologygeneticslaminationmouseneuron typesneuroscienceretina

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Cell-adhesion molecules (CAMs) mediate neuronal interactions, influencing migration, morphology, and synaptic connections.
  • The intracellular signaling pathways downstream of CAMs, particularly in different neuron types, remain poorly understood.

Purpose of the Study:

  • To investigate the role of Afadin, a cytosolic adapter protein linking CAMs to F-actin, in neural development.
  • To elucidate Afadin's function in retinal neuron organization and visual processing using a conditional mouse mutant.

Main Methods:

  • Utilized a conditional Afadin mouse mutant crossed with a retinal Cre driver (Six3Cre).
  • Employed viral labeling and genetic manipulation to analyze retinal neuron distribution and function.
  • Assessed neuron fate specification, survival, synaptic connections, and visual function in mutant mice.

Main Results:

  • Afadin deficiency in retinal neurons caused scrambled distribution of bipolar cells, amacrine cells, and retinal ganglion cells across retinal layers.
  • Mutant neurons showed normal fate specification and survival, with preserved RGC-AC synaptic partnering.
  • Significant visual function decline and mis-targeting of RGC axons to the superior colliculus were observed.

Conclusions:

  • Afadin plays a critical role in the precise lamination of retinal neurons, establishing the structural basis for visual processing.
  • Afadin's function in neuron sorting is distinct from its role in specifying cell fate or survival.
  • Disruption of Afadin-mediated sorting leads to impaired visual function and aberrant axonal projections.