Document Detail

Color vision of the coelacanth (Latimeria chalumnae) and adaptive evolution of rhodopsin (RH1) and rhodopsin-like (RH2) pigments.
MedLine Citation:
PMID:  10833047     Owner:  NLM     Status:  MEDLINE    
The coelacanth, a "living fossil," lives at a depth of about 200 m near the coast of the Comoros archipelago in the Indian Ocean and receives only a narrow range of light at about 480 nm. To see the entire range of "color" the Comoran coelacanth appears to use only rod-specific RH1 and cone-specific RH2 visual pigments, with the optimum light sensitivities (lambda max) at 478 nm and 485 nm, respectively. These blue-shifted lambda max values of RH1 and RH2 pigments are fully explained by independent double amino acid replacements E122Q/A292S and E122Q/M207L, respectively. More generally, currently available mutagenesis experiments identify only 10 amino acid changes that shift the lambda max values of visual pigments more than 5 nm. Among these, D83N, E1220, M207L, and A292S are associated strongly with the adaptive blue shifts in the lambda max values of RH1 and RH2 pigments in vertebrates.
S Yokoyama
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of heredity     Volume:  91     ISSN:  0022-1503     ISO Abbreviation:  J. Hered.     Publication Date:    2000 May-Jun
Date Detail:
Created Date:  2000-08-23     Completed Date:  2000-08-23     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375373     Medline TA:  J Hered     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  215-20     Citation Subset:  IM; S    
Department of Biology, Syracuse University, NY 13244-1220, USA.
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MeSH Terms
Adaptation, Physiological
Amino Acid Substitution
Color Perception / genetics*
Evolution, Molecular*
Fishes / genetics*
Models, Molecular
Retinal Cone Photoreceptor Cells / metabolism
Retinal Rod Photoreceptor Cells / metabolism
Rhodopsin / chemistry,  genetics*
Grant Support
Reg. No./Substance:

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