The regulation of tyrosinase gene transcription.
Tyrosinase is one of the key enzymes essential for melanogenesis. The control of its activity rests in part at the level of transcriptional regulation. The 5' promoter regions of the human, mouse, chicken, quail, snapping turtle, and frog tyrosinase sequences have been isolated and the mechanisms regulating the activity of these sequences are beginning to be elucidated. This review provides an update on the following aspects of tyrosinase gene regulation: basal promoter elements that determine the site of transcription initiation for RNA polymerase II; the cis-acting elements and DNA-binding factors that mediate melanocyte-specific expression of the tyrosinase gene; promoter elements involved in the temporal control of tyrosinase gene expression; additional elements that may be required to achieve wild-type levels of gene expression; and specific elements that may be required for modulation of tyrosinase gene expression in response to humoral factors or external stimuli that are known to influence the amounts of melanin synthesized by fully differentiated melanocytes. The wild type expression of tyrosinase is the result of the interaction of many different factors and it is becoming evident that certain elements and factors play more than one role in this process.
Ferguson
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Department of Anatomy and Cell Biology, Medical School, University of Cape Town, Observatory, South Africa.
Kidson
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D000818:Animals; D002645:Chickens / Q000235:genetics; D016384:Consensus Sequence; D000242:Cyclic AMP / Q000378:metabolism; D004790:Enzyme Induction / Q000187:drug effects / Q000528:radiation effects; D005136:Eye Proteins / Q000096:biosynthesis / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D005938:Glucocorticoids / Q000494:pharmacology; D006801:Humans; D008543:Melanins / Q000096:biosynthesis; D008544:Melanocytes / Q000187:drug effects / Q000201:enzymology / Q000528:radiation effects; D051379:Mice; D008850:Microphthalmos / Q000201:enzymology / Q000235:genetics; D014442:Monophenol Monooxygenase / Q000096:biosynthesis* / Q000235:genetics; D011401:Promoter Regions, Genetic; D011784:Quail / Q000235:genetics; D012867:Skin / Q000187:drug effects / Q000201:enzymology / Q000528:radiation effects; D012880:Skin Pigmentation / Q000187:drug effects / Q000528:radiation effects; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014157:Transcription Factors / Q000502:physiology; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D019076:Transgenes; D014212:Tretinoin / Q000494:pharmacology; D014466:Ultraviolet Rays; D014714:Vertebrates / Q000235:genetics / Q000378:metabolism
D005136:Eye Proteins; D005938:Glucocorticoids; D008543:Melanins; D014157:Transcription Factors; D014212:Tretinoin; D000242:Cyclic AMP; D014442:Monophenol Monooxygenase; D013755:Tetradecanoylphorbol Acetate