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Two different visual pigments in one retinal cone cell

P Röhlich¹, T van Veen, A Szél

¹Second Department of Anatomy, Histology, and Embryology, Semmelweis University of Medicine, Budapest, Hungary.

|November 1, 1994

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Mammalian cone cells can express multiple visual pigments, challenging the traditional view. This study found transitional cones in the retina co-expressing green-sensitive (M) and short-wavelength-sensitive (S) opsins.

Area of Science:

Ophthalmology
Retinal Biology
Visual Pigment Research

Background:

Mammalian retinas typically exhibit regional specialization of cone photoreceptors.
Green-sensitive (M) cones dominate superior areas, while short-wavelength-sensitive (S) cones are prevalent in inferior areas.

Purpose of the Study:

To investigate the expression of visual pigments in the transitional zones of mammalian retinas.
To determine if cone cells can express multiple opsins simultaneously.

Main Methods:

Utilized specific antibodies (COS-1 and OS-2) to label M and S cone photopigments.
Examined retinal tissue from mice, rabbits, and guinea pigs.

Main Results:

Cones in the transitional retinal zones were labeled by both M and S cone photopigment antibodies.

Related Experiment Videos

The majority of transitional cones co-expressed both M and S opsins.

A small population of genuine S cones was also identified.

Conclusions:

Cone cells in certain mammalian species can express multiple visual pigments concurrently.
This finding contrasts with the established notion of one opsin per cone.
Coexpression may result from overlapping regulatory factors controlling M and S cone fields.