Stage-specific expression of myelin basic protein in oligodendrocytes involves Nkx2.2-mediated repression that is relieved by the Sp1 transcription factor

Qiou Weit, W. Keith Miskimins, Robin Miskimins

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The homeodomain-containing protein Nkx2.2 is critical for the development of oligodendrocyte lineage cells, but the target genes of Nkx2.2 regulation have not been identified. In the present study, we found that the myelin basic protein gene is one of the genes that is regulated by Nkx2.2. Expression of Nkx2.2 represses the expression of myelin basic protein in oligodendrocyte progenitors. Two regulatory elements in the myelin basic protein promoter were identified and found to interact with Nkx2.2 in vitro. Despite their sequence divergence, both sites were involved in the Nkx2.2-mediated repression of the myelin basic protein promoter. Binding of Nkx2.2 also blocked and disrupted the binding of the transcriptional activator Purα to the myelin basic protein promoter. Additionally Nkx2.2 recruited a histone deacetylase 1-mSin3A complex to the myelin basic protein promoter. We also found that the transcription factor Sp1 was able to compete off the binding of Nkx2.2 to its consensus binding site in vitro and reversed the repressive effect of Nkx2.2 in vivo. Our data revealed a novel role for Nkx2.2 in preventing the precocious expression of myelin basic protein in immature oligodendrocytes. Based on this study and our previous reports, a model for myelin basic protein gene control is proposed.

Original languageEnglish (US)
Pages (from-to)16284-16294
Number of pages11
JournalJournal of Biological Chemistry
Volume280
Issue number16
DOIs
StatePublished - Apr 22 2005

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Sp1 Transcription Factor
Myelin Basic Protein
Oligodendroglia
Genes
Histone Deacetylase 1
Homeodomain Proteins
Binding Sites

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Stage-specific expression of myelin basic protein in oligodendrocytes involves Nkx2.2-mediated repression that is relieved by the Sp1 transcription factor. / Weit, Qiou; Miskimins, W. Keith; Miskimins, Robin.

In: Journal of Biological Chemistry, Vol. 280, No. 16, 22.04.2005, p. 16284-16294.

Research output: Contribution to journalArticle

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