Why cavefish are blind
Some fish exist as eyed, surface‐dwelling and eyeless, cave‐dwelling forms. The developmental processes that cause eye degeneration in different populations of Astyanax cavefish are similar. Although small optic primordia start to form, apoptosis of lens cells triggers developmental arrest and degen...
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| Veröffentlicht in: | BioEssays 2005-03, Vol.27 (3), p.235-238 |
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| creator | Tian, Natasha M.M.-L. Price, David J. |
| description | Some fish exist as eyed, surface‐dwelling and eyeless, cave‐dwelling forms. The developmental processes that cause eye degeneration in different populations of Astyanax cavefish are similar. Although small optic primordia start to form, apoptosis of lens cells triggers developmental arrest and degeneration of the eyes. Degeneration has been linked to reduced expression of the transcription factor Pax6 in the anterior embryonic midline and optic primordia. Recently, Yamamoto and colleagues1 reported that increased expression of the diffusible morphogen Sonic hedgehog (Shh) at the embryonic midline of cavefish reduces pax6 expression and increases expression of Shh‐regulated genes, which might confer selective advantages for life in caves. BioEssays 27:235–238, 2005. © 2005 Wiley Periodicals, Inc. |
| doi_str_mv | 10.1002/bies.20202 |
| format | Article |
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| ispartof | BioEssays, 2005-03, Vol.27 (3), p.235-238 |
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| source | MEDLINE; Wiley Online Library Journals Frontfile Complete |
| subjects | Animals Astyanax Blindness Eye Proteins - physiology Fishes - embryology Fishes - physiology Hedgehog Proteins Homeodomain Proteins - physiology Morphogenesis Paired Box Transcription Factors PAX6 Transcription Factor Repressor Proteins Trans-Activators - physiology |
| title | Why cavefish are blind |
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