Polymerase I and transcript release factor (PTRF) (PTRF)

Polymerase I and transcript release factor (PTRF), also known as Cavin-1, is a multifunctional protein essential for the biogenesis and structural integrity of caveolae, which are specialized invaginations of the plasma membrane (UniProt Q6NZI2; Hill et al., 2008, Cell). It functions by stabilizing caveolin-1 and organizing the caveolar coat, thereby playing a central role in lipid homeostasis, signal transduction, and mechanoprotection (Hayashi et al., 2009, Nature Genetics). Beyond its membrane-associated functions, PTRF is involved in the termination of RNA polymerase I transcription by facilitating the dissociation of the transcription complex from DNA (Jansa et al., 1998, EMBO J). Mutations in the PTRF gene are clinically linked to congenital generalized lipodystrophy type 4 (CGL4) and associated muscular dystrophies, highlighting its importance in metabolic and mechanical stability (Shastry et al., 2010, Am J Med Genet). In oncology, PTRF acts as a context-dependent modulator; it is frequently downregulated in prostate cancer, where it serves as a tumor suppressor, but upregulated in glioblastoma and pancreatic cancer, where it promotes tumor progression and chemoresistance (Nassar et al., 2013, Oncotarget; Huang et al., 2018, Cell Death & Disease). While PTRF is a significant target for research into membrane dynamics and disease mechanisms, there are currently no FDA-approved drugs that specifically target this protein (ClinicalTrials.gov).

Other names

Cavin-1Cavin1PTRFTTF-I-interacting protein 12

Modulation of caveolae-mediated signaling and RNA polymerase I transcription termination