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Zebrafish 발생란의 머리 형성에 관여하는 갑상선 호르몬 수용체 α1
김현,강윤희,노현주,장미숙,이명철 한국유전학회 1998 Genes & Genomics Vol.20 No.4
Retinoic acid (RA) is a well-documented morphogen for vertebrate embryonic development whereas RA-induced gene transcription has been known to be downregulated by thyroid hormone receptors (TRs). Because TRα1, a TR isoform is expressed in various vertebrate embryos before the formation of thyroid gland, it has been thus suggested to regulate the RA-mediated body pattern formation in a ligand-independent manner. In this report, we found that the treatment of 6×10^(-6) M of RA to 1∼8 cell stage embryos blocked the formation of head. zTRα1 is predominantly expressed in early-stage embryos and neurulas before the formation of thyroid gland. Finally, when zTRα1 anti-sense RNA was injected into one-cell stage embryos to block the endogenous expression of zTRα1, it hindered the head formation as the exogenous RA treatment did. Taken together with our previous report that zTRα1 downregulates the RA-induced gene transcription, these observations indicate that zTRα1 expressed in early-stage embryos may control the normal development of anterior portion by counteracting RA-induced gene transcriptions.