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A New Zebrafish Model for CACNA2D4-Dysfunction.

Domino K Schlegel^1,2, Stella M K Glasauer^1,3,4, José M Mateos⁵

¹Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland.

Investigative Ophthalmology & Visual Science

|December 14, 2019

Summary

This summary is machine-generated.

Mutations in CACNA2D4 cause retinal dysfunction. Zebrafish models show CACNA2D4 (α2δ4) is crucial for cone vision by regulating calcium channels (Cav) at the synapse.

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Area of Science:

Neuroscience
Genetics
Ophthalmology

Background:

Mutations in CACNA2D4, encoding the α2δ4 subunit of retinal voltage-gated calcium channels (Cav), lead to rare human retinal dysfunction, primarily impacting cone vision.
Understanding the precise role of α2δ4 in cone function and its cellular mechanisms is crucial for developing therapeutic strategies.

Purpose of the Study:

Investigate the function of CACNA2D4 in targeting Cav subunits within the retina.
Analyze the influence of α2δ4 on cone-mediated signal transmission.
Characterize cellular and subcellular changes in photoreceptors upon loss of α2δ4 using a zebrafish model.

Main Methods:

Identified and characterized two zebrafish CACNA2D4 paralogs (cacna2d4a and cacna2d4b).
Generated truncating frameshift mutations using CRISPR/Cas9.
Assessed retinal function and morphology via electroretinography, immunohistochemistry, light, and electron microscopy in mutant zebrafish.

Main Results:

Loss of cacna2d4b reduced the expression of the Cav1.4 pore-forming subunit (Cacna1fa).
Simultaneous knockout of both paralogs impaired cone-mediated ERG b-wave amplitude and increased "floating" synaptic ribbons.
Ectopic expression of Cacna1fa and Ribeye was observed in double-knockout photoreceptors, indicating disrupted synaptic organization.

Conclusions:

CACNA2D4b plays a conserved role in increasing Cav expression at the synaptic membrane.
Both zebrafish CACNA2D4 paralogs contribute to cone synaptic transmission, suggesting partial subfunctionalization.
The CACNA2D4-knockout zebrafish model exhibits mild cone dysfunction without retinal degeneration, making it suitable for studying human CACNA2D4-related retinal diseases.