| General information | Literature | Expression | Regulation | Mutation | Interaction |
Basic Information | |
|---|---|
Gene ID | 1638 |
Name | DCT |
Synonymous | TRP-2|TYRP2;dopachrome tautomerase (dopachrome delta-isomerase, tyrosine-related protein 2);DCT;dopachrome tautomerase (dopachrome delta-isomerase, tyrosine-related protein 2) |
Definition | DT|L-dopachrome Delta-isomerase|L-dopachrome tautomerase|TRP2|dopachrome delta-isomerase|tyrosinase-related protein 2 |
Position | 13q32 |
Gene type | protein-coding |
Cancer type | Abstract |
| Retinoblastoma;Ophthalmology | Tyrosinase-related protein 2 (TRP-2), also known as DOPAchrome tautomerase, is an enzyme in melanin biosynthesis and may play an important role in detoxification of a metabolite derived from DOPA. TRP-2 is expressed in melanocytes of neural crest origin and retinal pigment epithelium (RPE), derived from the optic cup. TRP-2 has been established as an early differentiation marker for melanoblasts and RPE. It is therefore of significance to study the regulation of TRP-2/DOPAchrome tautomerase expression. Here we show that TRP-2 mRNA is expressed in Y79 human retinoblastoma cell line, derived from a primitive multipotential retinal cell. Retinoblastoma is the common primary intraocular tumor of childhood. Basal expression levels in Y79 retinoblastoma cells of TRP-2mRNA and protein are comparable to those in melanoma cells, whereas mRNA for tyrosinase, the rate-limiting enzyme in melanogenesis, is undetectable in retinoblastoma cells. Transient transfection assays showed that the TRP-2 gene promoter efficiently directs the reporter gene expression in retinoblastoma cells as it does in melanoma cells. Moreover, the expression of TRP-2 mRNA was inducedby retinoic acid in retinoblastoma cells but not noticeably affected by forskolin, a cAMP-elevating reagent, whereas in melanoma cells its expression was induced by forskolin but not by retinoic acid. These results suggest a difference in the regulation of TRP-2 expression between retinoblastoma and melanoma cells.Moreover, TRP-2 mRNA is expressed in the excised retinoblastoma specimens, as assessed by RT-PCR. The present study shows unexpected features of TRP-2 and mayenhance our understanding of the pathophysiology of retinoblastoma.#CI- Copyright 2001 Academic Press. |