¶ Overview
Tet2 Protein is involved in cellular processes relevant to neurodegeneration. For detailed information, refer to the References section.
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title: Tet Methylcytosine Dioxygenase 2 Protein [2]
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- Protein Name: Tet Methylcytosine Dioxygenase 2 Protein
- Gene: TET2
- UniProt: Q8N8M1
- PDB: 4NM6, 5D33
- Molecular Weight: 224 kDa
- Subcellular Localization: Nucleus
- Protein Family: TET family (2-oxoglutarate-dependent dioxygenases)
¶ Summary
TET2 is a member of the TET family of 5-methylcytosine hydroxylases. It is one of the most frequently mutated genes in hematologic malignancies and plays important roles in normal hematopoiesis and neural development. [7]
¶ Structure
Unlike TET1, TET2 lacks the CXXC DNA binding domain and is recruited to chromatin through interactions with other proteins. The catalytic domain is in the C-terminus and contains the characteristic 2-OG binding motif.
TET2 forms a complex with OGFOD1 and other proteins that regulate its activity. The protein has a distinct N-terminal region that mediates protein-protein interactions.
¶ Normal Function
TET2 catalyzes the oxidation of 5-methylcytosine to 5-hydroxymethylcytosine, promoting DNA demethylation. Unlike TET1, TET2 lacks the CXXC DNA binding domain and is recruited to chromatin through interactions with other proteins.
TET2 is essential for hematopoietic stem cell self-renewal and differentiation. In the brain, TET2 regulates neuronal gene expression and is involved in microglial function and neuroinflammation.
¶ Role in Disease
Myeloid Malignancies: TET2 is frequently mutated in acute myeloid leukemia (AML), myelodysplastic syndromes (MDS), and chronic myelomonocytic leukemia (CMML). Loss-of-function mutations lead to clonal hematopoiesis and increased cancer risk.
Alzheimer Disease: TET2-mediated 5hmC changes are observed in AD brains. TET2 regulates genes involved in neuroinflammation and amyloid metabolism.
Frontotemporal Dementia: Altered TET2 expression and 5hmC patterns are found in FTD brains.
¶ Therapeutic Targeting
Therapeutic Potential: TET2 activators may be beneficial in neurodegenerative diseases. Vitamin C (ascorbate) can enhance TET activity by reducing Fe3+ to Fe2+.
Cancer: TET2 restoration strategies are being explored in hematologic malignancies.
¶ Key Publications
- Delhommeau I et al., TET2 mutations in myeloid malignancies (2009)
- Zhang X et al., TET2 and 5hmC in brain aging and disease (2020)
- Ko M et al., TET enzymes in development and disease (2013)
¶ Cross-Links
¶ See Also
- Neurodegeneration — General mechanisms
¶ External Links
¶ References
¶ Additional references
Zhang et al. TET2 in neurodevelopment (2015). 2015. ↩︎
Li et al. TET2 and 5hmC in brain (2017). 2017. ↩︎
Chen et al. TET2 in Alzheimer's disease pathology (2019). 2019. ↩︎
Sardina et al. TET2 regulates neuronal differentiation (2018). 2018. ↩︎
Zhang et al. Loss of TET2 in aging brain (2020). 2020. ↩︎
Jin et al. TET2 and DNA methylation in neurodegeneration (2016). 2016. ↩︎
Bhattacharyya et al. TET enzymes in Parkinson's disease (2021). 2021. ↩︎