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  • Title: Visual pigment homologies revealed by DNA hybridization.
    Author: Martin RL, Wood C, Baehr W, Applebury ML.
    Journal: Science; 1986 Jun 06; 232(4755):1266-9. PubMed ID: 3010467.
    Abstract:
    A bovine rhodopsin complementary DNA probe was used to detect homologous visual pigment genes in a variety of species. Under stringent DNA hybridization conditions, genomic DNA from most vertebrate species carried a single homologous fragment. Additional homologies were detected in some vertebrates by reducing the hybridization stringency. Homologous fragments were also detected in DNA isolated from invertebrate species, a unicellular alga, and an archaebacterium; many of these fragments were homologous to a Drosophila opsin probe. These results suggest that photosensory pigments in a wide variety of species arose from a common precursor.
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