A Novel Polymorphic AP-1 Binding Element of the GFAP Promoter is Associated with Different Allelic Transcriptional Activities

Tiziana Bachetti, Eleonora DiZanni, Francesca Lantieri, Francesco Caroli, Stefano Regis, Mirella Filocamo, Innocenzo Rainero, Salvatore Gallone, Roberto Cilia, Silvia Romano, Mario Savoiardo, Davide Pareyson, Roberta Biancheri, Roberto Ravazzolo, Isabella Ceccherini

Research output: Contribution to journalArticlepeer-review

Abstract

The Glial Fibrillary Acidic Protein (GFAP) gene encodes a cytoskeletal protein belonging to the intermediate filament family whose expression is considered as a marker of astrocytes differentiation. GFAP expression, shown to be upregulated as a consequence of brain gliosis, depends on hormones, growth factors, cytokine, and transcription factors and, among these latters, activator protein 1 (AP-1) has been demonstrated to play a crucial role. In this study, we have focused on a 2.2 kb sequence of the regulatory region located upstream of the GFAP gene, searching in a panel of control individuals for single-nucleotide polymorphisms (SNPs) that could modulate GFAP transcription. Among four SNPs of the GFAP promoter whose alleles have been predicted by in silico analysis to induce differences in the pattern of binding transcription factors, we have identified a new AP-1 binding site lying at -250 bp upstream from the GFAP transcriptional start site. The two alleles of this polymorphic locus have shown to bind the AP-1 complex to different extents, thus promoting variable transcriptional activities of the GFAP promoter. Therefore, these SNP alleles may, among others, mediate the effects of GFAP mutations, thus explaining the phenotypic heterogeneity of Alexander disease.

Original languageEnglish
Pages (from-to)506-515
Number of pages10
JournalAnnals of Human Genetics
Volume74
Issue number6
DOIs
Publication statusPublished - Nov 2010

Keywords

  • AP-1
  • GFAP promoter
  • Single nucleotide polymorphisms

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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