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- Title
Adaptive differences in the structure and macromolecular compositions of the air and water corneas of the "four-eyed" fish (Anableps anableps).
- Authors
Swamynathan, Shivalingappa K.; Crawford, Mary A.; Robison Jr., W. Gerald; Kanungo, Jyotshnabala; Piatigorsky, Joram
- Abstract
The water meniscus bisects the eyes of the "four-eyed" fish Anableps anableps, resulting in simultaneous vision in air and water. We compare the structure and macromolecular compositions of the Anableps dorsal (air) and ventral (water) corneas with the fully aquatic zebrafish cornea. The Anableps dorsal corneal epithelium is thicker >20 cell layers), flatter (∼ 1.94 mm radius of curvature), and contains ∼ 15-fold more glycogen (0.16 µg/µg water-soluble protein) than the ventral corneal epithelium (5-7 cell layers; ∼ 1.63 mm radius of curvature; 0.01 µg glycogen/µg watersoluble protein), which resembles the zebrafish corneal epithelium. Gelsolin is the major water-soluble protein in the zebrafish (∼ 50%) and Anableps dorsal (∼ 38%) and ventral (∼ 21%) corneal epithelia, suggesting that gelsolin was recruited for high corneal expression before these two species diverged at least 100 million years ago and that abundant corneal gelsolin is not limited to aquatic vision. Anableps gelsolin, deduced from its cDNA, is 57% identical to zebrafish gelsolin. Paucity of Anableps corneal F-actin (consistent with high gelsolin) was confirmed by the absence of rhodaminephalloidin staining. We suggest amphibious refraction and protection from UV irradiation and desiccation in air as selective constraints for the specializations of the Anableps dorsal cornea.
- Subjects
FISH anatomy; ZEBRA danio; CORNEA; PROTEINS; CYTOLOGY; MOLECULAR biology
- Publication
FASEB Journal, 2003, Vol 17, Issue 14, p1996
- ISSN
0892-6638
- Publication type
Article
- DOI
10.1096/fj.03-0122com