Prion protein gene promoter CpG sites (PRNP promoter CpG sites)

The PRNP gene promoter CpG sites are critical regulatory elements located in the 5-prime flanking region of the Prion Protein (PRNP) gene, which encodes the cellular prion protein (PrPC) (PubMed: 15634746). DNA methylation at these specific cytosine-guanine dinucleotides serves as a key epigenetic mechanism for controlling PRNP expression levels (PubMed: 22451507). In the context of neurodegenerative prion diseases, such as Creutzfeldt-Jakob disease (CJD), the abundance of PrPC is a primary determinant of disease susceptibility and progression, as PrPC is the essential substrate for conversion into the infectious, misfolded PrPSc isoform (PubMed: 29632311). Consequently, the PRNP promoter CpG sites represent a strategic target for therapeutic intervention aimed at gene silencing to reduce the total PrPC load. While systemic DNA methyltransferase inhibitors like Azacitidine can influence these sites, more precise approaches using CRISPR-based epigenetic editors are being investigated to achieve site-specific silencing (PubMed: 31063444). Beyond prion diseases, aberrant methylation of the PRNP promoter has also been implicated in the progression of certain cancers, where PrPC expression may influence cell proliferation and resistance to apoptosis (PubMed: 24508216).

Other names

PRNP promoter methylation sitesPrion protein gene regulatory regionPRNP CpG islandPRNP 5-prime-UTR CpG sites

Modulation of DNA methylation at the PRNP promoter to downregulate the expression of the cellular prion protein (PrPC), thereby reducing the substrate available for conversion into the pathogenic PrPSc isoform.