Identification of the minimal melanocyte-specific promoter in the melanocortin receptor 1 gene

Stefania Miccadei, Barbara Pascucci, Mauro Picardo, Pier Giorgio Natali, Donato Civitareale

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Abstract

Background. The understanding of cutaneous pigmentation biology is relevant from the biologic and clinical point of view. The binding of α-melanocortin and its specific receptor, on the plasma membrane of melanin synthesising cells, plays a crucial role in melanins biosynthesis. Furthermore, loss of MC1R function is associated with an increased incidence of melanoma and non-melanoma skin cancer. The expression of the α-melanocortin receptor gene is highly controlled but, at the present, region responsible for tissue-specific activity of the gene promoter has not been identified. Methods. We have cloned the genomic sequences upstream the human MC1R coding gene. A DNA fragment of 5 kilobases upstream the human MC1R encoding sequence was placed in front of a reporter gene and several deletion mutants of such fragment have been prepared. These constructs have been tested for the ability to drive the melanocyte-specific gene expression of the reporter gene using transfection experiments in melanocyte and non-melanocyte cell lines. From these experiments we identified a DNA fragment with the ability to drive the gene transcription in a tissue-specific way and we used this small DNA fragment in DNA-protein interaction assays. Results. We show that the 150 base pairs upstream the MC1R gene initiation codon are able to drive the melanocyte-specific gene transcription. Furthermore, we provide experimental evidences suggesting that on such minimal melanocyte-specific gene promoter can assemble tissue-specific complexes. Conclusion. The present results strongly imply that the transcriptional regulation of the melanocyte-specific MC1R gene requires an internal promoter located in the 150 base pairs upstream the initiation codon.

Original languageEnglish
Article number71
JournalJournal of Experimental and Clinical Cancer Research
Volume27
Issue number1
DOIs
Publication statusPublished - 2008

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ASJC Scopus subject areas

  • Cancer Research
  • Oncology
  • Medicine(all)

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