Document Detail

Serine/alanine amino acid polymorphism of the L-cone photopigment assessed by dual Rayleigh-type color matches.
MedLine Citation:
PMID:  8160373     Owner:  NLM     Status:  MEDLINE    
The dual Rayleigh-type color match is the ratio of 621 nm light to 550 nm light that in admixture matches 586 nm light, divided by the ratio of 667 nm light to 550 nm light that in admixture matches 586 nm light. Compared to the classical Rayleigh match, the dual-match procedure minimizes variation in color matching arising from differences in lens pigmentation and photopigment optical density, and thus amplifies individual differences due to shifts in L pigment lambda max. We hypothesized that the dual matches would provide a clearer distinction between subjects with serine and subjects with alanine than would the classical Rayleigh match because individuals with serine express L pigments with a lambda max shifted toward longer wavelengths than do those with alanine. Classical Rayleigh color matches were compared with dual Rayleigh-type color matches in 14 color-normal observers whose DNA had been analyzed previously for the presence of the amino acid serine or alanine at position 180 in the L opsin. The resulting distribution of dual-match measurements for the seven subjects with serine does not overlap the distribution of measurements for the seven subjects with alanine. The classical Rayleigh-match measurements for these two groups of subjects, on the other hand, overlap substantially. More than half of the subjects' classical Rayleigh matches are within the overlapping range. The dual Rayleigh-type matches, therefore, provide an improved psychophysical technique for assessing whether an individual observer has serine or alanine at position 180.
E Sanocki; S K Shevell; J Winderickx
Related Documents :
12430833 - Color naming and the phototoxic effects of sunlight on the eye.
20706413 - On the gamut of colors seen through birefringent airplane windows.
11495963 - Variations in photoreceptor response dynamics across the fly retina.
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  34     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1994 Feb 
Date Detail:
Created Date:  1994-05-18     Completed Date:  1994-05-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  377-82     Citation Subset:  IM    
Department of Psychology, University of Washington, Seattle 98195.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Alanine / genetics*
Color Perception / genetics*
Ophthalmology / methods
Photoreceptor Cells*
Polymorphism, Genetic*
Rod Opsins / genetics*
Serine / genetics*
Grant Support
Reg. No./Substance:
0/Rod Opsins; 56-41-7/Alanine; 56-45-1/Serine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Individual differences in cone photopigments of normal trichromats measured by dual Rayleigh-type co...
Next Document:  The effect of stimulus contrast and interocular correlation on disparity vergence.