Promoter methylation and tissue-specific transcription of the α7 nicotinic receptor gene, CHRNA7
| Autor: | Molly Plehaty, Carla Drebing, Christina Osborne, Lisa B. Wilson, Jessica Finlay-Schultz, Sharon L. Graw, Judith Logel, Rosemary Eyeson, Sherry Leonard, Milda Palionyte, Andrew Canastar |
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| Rok vydání: | 2011 |
| Předmět: |
Transcription
Genetic alpha7 Nicotinic Acetylcholine Receptor Response element Primary Cell Culture Promoter General Medicine Methylation Biology DNA Methylation Receptors Nicotinic Molecular biology DNA methyltransferase Epigenesis Genetic Cellular and Molecular Neuroscience Epigenetics of physical exercise Organ Specificity Cell Line Tumor DNA methylation Histone methylation Humans Promoter Regions Genetic Epigenomics HeLa Cells |
| Zdroj: | Journal of molecular neuroscience : MN. 47(2) |
| ISSN: | 1559-1166 |
| Popis: | The α7 nicotinic acetylcholine receptor is known to regulate a wide variety of developmental and secretory functions in neural and non-neural tissues. The mechanisms that regulate its transcription in these varied tissues are not well understood. Epigenetic processes may play a role in the tissue-specific regulation of mRNA expression from the α7 nicotinic receptor subunit gene, CHRNA7. Promoter methylation was correlated with CHRNA7 mRNA expression in various tissue types and the role of DNA methylation in regulating transcription from the gene was tested by using DNA methyltransferase (DNMT1) inhibitors and methyl donors. CHRNA7 mRNA expression was silenced in SH-EP1 cells and bisulfite sequencing PCR revealed the CHRNA7 proximal promoter was hypermethylated. The proximal promoter was hypomethylated in the cell lines HeLa, SH-SY5Y, and SK-N-BE which express varying levels of CHRNA7 mRNA. Expression of CHRNA7 mRNA was present in SH-EP1 cells after treatment with the methylation inhibitor, 5-aza-2-deoxycytidine (5-Aza-CdR), and increased in SH-EP1 and HeLa cells using another methylation inhibitor, zebularine (ZEB). Transcription from the CHRNA7 promoter in HeLa cells was increased when the methyl donor methionine (MET) was absent from the media. Using methylation-sensitive restriction enzyme analysis (MSRE), there was a strong inverse correlation between CHRNA7 mRNA levels and promoter DNA methylation across several human tissue types. The results support a role for DNA methylation of the proximal promoter in regulation of CHRNA7 transcription. |
| Databáze: | OpenAIRE |
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