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Polypyrimidine tract-binding protein 2 (PTBP2)
- Target
- PTBP2
- Molecular classification
- RNA-binding protein, Splicing regulator, Transcription factor (broader context—regulator of gene expression via RNA processing)
01
Overview
Polypyrimidine tract-binding protein 2 (PTBP2) is an RNA-binding protein closely related to PTBP1. PTBP2 is highly expressed in the nervous system, where it regulates alternative pre-mRNA splicing, translation, and RNA stability. PTBP2 controls neural differentiation and maturation by repressing premature adult exon expression during development, ensuring proper timing of neuronal protein isoform expression. It is essential for neuronal survival postnatally and is implicated in various cancers, where it promotes cell proliferation and tumor formation by modulating RNA processing and mitochondrial function. PTBP2 may also play roles in cell fate decisions and autophagy via interactions with RNAs in specific cellular pathways
- Other names
- PTBP2PTB-like proteinNeural polypyrimidine tract-binding proteinNeurally-enriched homolog of PTBPTBLPbrPTBnPTBPTBPolypyrimidine tract binding protein 2
02
Biological functions
Alternative pre-mRNA splicingRegulation of translationRNA stabilityCell fate and proliferation (neurogenesis)Regulation of autophagy
03
Disease associations
Cancer (oncogenic in chronic myeloid leukemia, glioblastoma, osteosarcoma, colorectal cancer)Neurodevelopmental disorders (essential for neuronal development/survival)Other: Bulbar polio, Patellar tendinitis (as per genomic disease association)
04
Safety considerations
Essential for neuronal development—loss causes brain degeneration and postnatal lethality in miceOff-target toxicity risk in splicing-modulating therapies, especially in the nervous systemPotential for oncogenic regulation in cancer models (elevated PTBP2 promotes proliferation)
05
Biomarkers
PTBP2 expression (used as a molecular marker of neuronal differentiation and malignancy type—high levels suggest neural or cancer cell context)miR-124 status (regulates PTBP2 via controlling PTBP1)
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