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Updated: Sep 15, 2025

A Rhodopsin Transport Assay by High-Content Imaging Analysis

A Rhodopsin Transport Assay by High-Content Imaging Analysis

Published on: January 16, 2019

Aggregation of the Constitutively Active K296E Rhodopsin Mutant Contributes to Retinal Degeneration.

Sreelakshmi Vasudevan¹, Vivek Prakash¹, Paul S-H Park¹

¹Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology

|July 16, 2025

Summary

A K296E mutation causes retinitis pigmentosa by mislocalizing and aggregating rhodopsin in photoreceptor cells. This aggregation, not just constitutive activity, may drive retinal degeneration.

Keywords:

G protein‐coupled receptor constitutive activity photoreceptor cell phototransduction protein aggregation retinal degeneration

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Area of Science:

Ophthalmology
Genetics
Molecular Biology

Background:

Autosomal dominant retinitis pigmentosa (RP) is a progressive retinal degenerative disease.
A K296E mutation in rhodopsin is a known cause of RP.
Previous research focused on the constitutively active nature of the K296E mutant.

Purpose of the Study:

To investigate the pathogenic mechanism of the K296E rhodopsin mutation.
To characterize K296E rhodopsin mutant behavior in vivo and in vitro.
To determine the role of rhodopsin aggregation in RP pathogenesis.

Main Methods:

Generation and characterization of K296E rhodopsin knockin mice.
Assessment of photoreceptor cell integrity and rhodopsin localization.
In vitro aggregation assays using different rhodopsin species backgrounds.
Use of PROTEOSTAT dye to detect protein aggregates.

Main Results:

K296E knockin mice displayed progressive retinal degeneration.
The K296E rhodopsin mutant mislocalized and aggregated within photoreceptor cells.
In vitro studies confirmed the aggregation propensity of the K296E mutant.
Aggregation varied depending on the rhodopsin species background (murine/human vs. bovine).

Conclusions:

Rhodopsin aggregation, in addition to constitutive activity, is a potential contributor to photoreceptor cell loss in RP.
The K296E mutation's pathogenic mechanism involves protein mislocalization and aggregation.
Species background is critical when modeling K296E-associated RP, with bovine rhodopsin being inadequate.