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Publikationstyp: Zeitschriftenaufsatz
Dokumenttyp: Originalarbeit

Jahr: 2008

AutorInnen: Glösmann, M; Steiner, M; Peichl, L; Ahnelt, PK

Titel: Cone photoreceptors and potential UV vision in a subterranean insectivore, the European mole.

Quelle: J Vis. 2008; 8(4):23.1-2312

Autor/innen der Vetmeduni Vienna:

Glösmann Martin

Diese Publikation wurde nicht im Namen der Vetmeduni Vienna erstellt und ist deshalb ausschließlich der persönlichen Publikationsliste des/der Autors/Autorin zugeordnet!

We have examined the presence, the distribution, and the opsin identity of photoreceptor types in the retina of the European mole, Talpa europaea, a subterranean insectivore with regressed morphology of the visual system. Cones and rods were identified using opsin antisera, and their topographies determined from flat-mounted retinas. The retina (total area 0.75 mm(2)) contains about 100,000 photoreceptors, 10-12% of which are cones. Rod density is low (theoretical maximum 127,000 mm(-2)). Cone density peaks in central retina (17,750 mm(-2)). Similar to most mammals, two cone opsins, shortwave-sensitive (S) and middle-to-long-wave-sensitive (M), are present. Cone distribution shows a dorsoventral gradient with higher S cone numbers in ventral retina. Coexpression of S and M opsin occurs in more than 30% of the cones. Partial sequencing of the S opsin gene strongly supports UV sensitivity of the mole S cone photopigment. Amino acids that spectrally tune the S opsin are identical in T. europaea and in mammals with known UV cone photosensitivity. The lens transmits light down to 300 nm. Together, our data suggest that photopic vision and UV sensitivity of a cone pigment play a functional role in the European mole.

Keywords Pubmed: Animals
Photoreceptor Cells, Invertebrate/physiology*
Photoreceptor Cells, Invertebrate/ultrastructure
Rod Opsins/biosynthesis
Rod Opsins/radiation effects
Ultraviolet Rays*
Visual Perception/physiology*

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