Dynamic changes in visual pigment composition in coho salmon (Oncorhynchus kisutch)

Hawryshyn, C. W., Temple, S. E., Ramsden, S. and Haimberger, T. J. (2003). Dynamic changes in visual pigment composition in coho salmon (Oncorhynchus kisutch). In: Investigative Ophthalmology & Visual Science. Proceedings of: Annual Meeting of the Association for Research in Vision and Ophthalmology. Annual Meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, FL, U.S.A, (U713-U713). 4-8 May 2003.


Author Hawryshyn, C. W.
Temple, S. E.
Ramsden, S.
Haimberger, T. J.
Title of paper Dynamic changes in visual pigment composition in coho salmon (Oncorhynchus kisutch)
Formatted title
Dynamic changes in visual pigment composition in coho salmon (Oncorhynchus kisutch)
Conference name Annual Meeting of the Association for Research in Vision and Ophthalmology
Conference location Fort Lauderdale, FL, U.S.A
Conference dates 4-8 May 2003
Proceedings title Investigative Ophthalmology & Visual Science. Proceedings of: Annual Meeting of the Association for Research in Vision and Ophthalmology   Check publisher's open access policy
Journal name Investigative Ophthalmology   Check publisher's open access policy
Place of Publication Rockville, MD, U.S.A.
Publisher Association for Research in Vision and Ophthalmology (ARVO)
Publication Year 2003
Sub-type Published abstract
ISSN 0146-0404
1552-5783
Volume 44
Issue Supp. 2
Start page U713
End page U713
Total pages 1
Language eng
Formatted Abstract/Summary
Purpose: There are two visual pigment chromophores that can be employed in vertebrate retinas; 11-cis retinal and 11-cis 3,4-dehydroretinal. Altering the visual pigment chromophore results in a measurable shift in spectral absorbance of individual photoreceptors that can be used to calculate the ratio of the two chromophores. Temperature, day length, light intensity and hormones have all been found to invoke shifts in chromophore ratio. Coho salmon follow a seasonal pattern in which the visual pigment composition varies gradually with season. However, some researchers have reported measurable shifts in as little as 3 days. The aim of this work was to determine the rate of chromophore interchange in coho salmon that have been treated with thyroid hormone, and to determine if both rods and cones shift simultaneously.

Conclusions: Coho salmon treated with thyroid hormone, doubled the concentration of 11-cis 3,4-dehydroretinal in their visual pigments in approximately four weeks and were capable of returning to their pretreatment ratio in only two weeks. The direction of shift in chromophores was from retinal to dehydroretinal regardless of the season and the natural direction of shift. The shift in chromophores resulted in shifts in absorbance of both rod and cones which would result in considerable alterations of both photopic and scotopic spectral sensitivity.
© 2003, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved.
Subjects 111301 Ophthalmology
1109 Neurosciences
1113 Ophthalmology and Optometry
Keyword Photoreceptors
Opsins
Retinoids/retinoid binding proteins
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Meeting E-Abstract 5117—B776

 
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Created: Tue, 09 Mar 2010, 10:25:02 EST by Thelma Whitbourne on behalf of Faculty of Science