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Thyroid hormone in skeletal development of cyprinids: effects and morphological consequences

Authors


Author’s address: Fedor N. Shkil, Kol’tzov Institute of Developmental Biology, RAS, Vavilova str., 26, 119334 Moscow, Russia.
E-mails: fedorshkil@gmail.com; fedorshkil@yandex.ru

Summary

The effects of thyroid hormone (TH) level changes on skeletal development were studied in cyprinids Labeobarbus intermedius (Barbinae) and Danio rerio (Danioninae). TH was revealed to influence development of a skull, axial skeleton, paired fins and girdles, and squamation. Usually, high TH-level promotes the premature onset and acceleration of ontogenetic processes, whereas TH-deficiency delays and retards them. However, skeletal elements differ in TH-responsiveness. Alterations of TH level induce developmental changes in some structures but do not cause any changes in others. As a result, the normal sequence of ontogenetic events and the temporal interrelations between ontogenetic processes undergo changes resulting in changes in adult morphology.

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