Insulin-like growth factor 2 promoter 4 (IGF2-P4)

The Insulin-like growth factor 2 promoter 4 (IGF2-P4) is a specific genomic regulatory element that controls the transcription of the IGF2 gene, a key mediator of cell growth and survival (UniProt, 2024). In humans, the IGF2 gene is governed by four distinct promoters (P1-P4), with P4 being highly active during fetal development and frequently reactivated or overexpressed in adult cancers (PubMed, PMID: 11549671). This reactivation often occurs through the loss of genomic imprinting or the recruitment of specific transcription factors like Sp1 and downstream effectors of the PI3K/AKT pathway (Journal of Biological Chemistry, 2001). Because IGF2-P4 activity is significantly higher in malignant tissues compared to most healthy adult tissues, it serves as a focal point for therapeutic intervention and diagnostic monitoring (NIH, 2023). Experimental strategies include using the P4 promoter to drive the expression of cytotoxic genes in gene therapy or employing small molecules like Mithramycin A to block the binding of essential transcription factors (Cancer Research, 2006). Targeting this promoter aims to reduce the oncogenic overdose of IGF2 protein, thereby inhibiting tumor progression and enhancing the efficacy of other anti-cancer treatments (PubMed, PMID: 9548546).

Other names

IGF2 P4Insulin-like growth factor II promoter 4IGF-II P4 promoterIGF2-P4 regulatory region

Transcriptional repression via inhibition of transcription factor binding to GC-rich promoter regions