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Visual pigments in the sea lamprey, Petromyzon marinus

Published online by Cambridge University Press:  02 June 2009

Ferenc I. Hárosi
Affiliation:
Laboratory of Sensory Physiology, Marine Biological Laboratory, Woods Hole, and Department of Physiology, Boston University School of Medicine, Boston
Jochen Kleinschmidt
Affiliation:
Department of Ophthalmology, New York University Medical Center, New York

Abstract

We present microspectrophotometric evidence for the existence of two distinct visual pigments residing in two different morphological types of photoreceptor of the sea lamprey. In the upstream migrant Petromyzon marinus, the pigment found in short receptors has a wavelength of peak absorbance (λmax) of 525 nm, whereas the pigment located in long receptors has a λmax of 600 nm. Although the former appears to be pure porphyropsin, the latter is akin to visual pigments found in the red-absorbing cones of amphibian and teleost retinae. The kinship is more than superficial pertaining to λmax of the a–band absorbance to its native maximum value. The presence of an anion-sensitive and an anion-insensitive pigment in a retina implies the expression of two distinct opsin genes. We infer this from several examples of correlation between anion sensitivity and opsin sequence groupings. Moreover, the presence of two distinct opsin genes expressed throughout six vertebrate classes implies their existence in a common ancestor to all.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1993

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