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  • Title: Partial respecification of nasotemporal polarity in double-temporal chick and chimeric chick-quail eyes.
    Author: Mueller BK, Dütting D, Haase A, Feucht A, Macchi P.
    Journal: Mech Dev; 1998 Jun; 74(1-2):15-28. PubMed ID: 9651470.
    Abstract:
    In chick embryos, naso-temporal polarity of the retina becomes established before Hamburger-Hamilton stage 10. To examine the plasticity of the early eye anlage, double-temporal eyes were made using stage 10-11 (E1.5) chick embryos and stage 8-9 quail embryos. In vivo and in vitro experiments revealed that these double-temporal compound eyes were not completely temporal but nasal in a large peripheral part of the graft. Four hours after transplantation, the nasal-specific fork head transcription factor CBF1 was not expressed in double-temporal eyes but was clearly detectable 24 h later. This suggests that in the peripheral part of the graft, temporal positional values were changed into nasal positional values by a respecification process.
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