E2F3 (E2F Transcription Factor 3) is a critical member of the E2F family of transcription factors that regulate gene expression essential for cell cycle progression, DNA replication, and cellular proliferation[1][2]. Located on chromosome 6p22, E2F3 functions as both a transcriptional activator and repressor, depending on its binding partners and cellular context[3]. Beyond its well-established role in cell cycle regulation, E2F3 has emerged as a significant factor in neuronal development, synaptic plasticity, and neurodegeneration.
| Property | Value |
|---|---|
| Gene Symbol | E2F3 |
| Full Name | E2F Transcription Factor 3 |
| Chromosomal Location | 6p22.1 |
| NCBI Gene ID | 1871 |
| OMIM ID | 600427 |
| Ensembl ID | ENSG00000112242 |
| UniProt ID | O00716 |
| Encoded Protein | E2F transcription factor 3 (389 aa) |
| Protein Family | E2F family of transcription factors |
| Associated Diseases | Retinoblastoma, cancer, Alzheimer's disease, Parkinson's disease |
E2F3 is a key regulator of the G1/S transition in the cell cycle[1:1]. It functions as part of a complex with retinoblastoma protein (pRb):
The E2F family consists of multiple members (E2F1-E2F8) with distinct but overlapping functions. E2F3, particularly E2F3a and E2F3b isoforms, plays essential roles in embryonic development and tissue homeostasis[3:1].
E2F3 regulates numerous genes involved in:
E2F3 has been implicated in Alzheimer's disease pathogenesis through several mechanisms[4]:
Cell Cycle Re-entry Hypothesis: Post-mitotic neurons in Alzheimer's disease abnormally re-enter the cell cycle, leading to DNA replication stress and neuronal death. E2F3 dysregulation contributes to this pathological process:
Synaptic Dysfunction: E2F3 regulates genes critical for synaptic function:
In Parkinson's disease, E2F3 may play roles in[5]:
The cell cycle dysregulation hypothesis of neurodegeneration proposes that neurons attempt to re-enter the cell cycle but fail to complete division, leading to apoptotic death[4:1]. E2F3 is central to this process:
E2F3 is expressed in various brain regions:
During development, E2F3 expression is high in proliferating neural progenitor cells. In adult brain, E2F3 expression is maintained at lower levels in mature neurons where it continues to regulate synaptic plasticity genes.
Understanding E2F3's role in neurodegeneration opens therapeutic avenues:
E2F3 interacts with several key proteins:
Dyson NJ. RB1: a prototype tumor suppressor and its biology. Annual Review of Cancer Biology. 2018. ↩︎ ↩︎
Attwooll C, Lazzerini Denchi E, Helin K. The E2F family: specific functions and overlapping interests. The EMBO Journal. 2004. ↩︎ ↩︎ ↩︎
Chen HZ, Tsai SY, Leone G. Emerging roles of E2Fs in cancer: an exit from cell cycle control. Nature Reviews Cancer. 2009. ↩︎ ↩︎
Yang Y, Mufson EJ, Herrup K. Neuronal cell death is preceded by cell cycle re-entry: a historical perspective. Progress in Brain Research. 2013. ↩︎ ↩︎
Höglinger GU, Breunig JJ, Depboylu C, et al. The pRb/E2F cell-cycle pathway mediates cell death in Parkinson's disease. Proceedings of the National Academy of Sciences. 2007. ↩︎