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Published on: November 15, 2017
Quantitative proteomics revealed new functions of ALKBH4
Kailin Yu1, Tianyu F Qi2, Weili Miao1
1Department of Chemistry, University of California, Riverside, California, USA.
ALKBH4 demethylase regulates DNA methylation. Its absence increases DNA (cytosine-5)-methyltransferase 1 (DNMT1), reducing GSTP1 and HSPB1 protein levels by altering gene promoter methylation.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- ALKBH4 is a demethylase acting on proteins and DNA.
- Its precise role in epigenetic regulation remains under investigation.
Purpose of the Study:
- To investigate the function of ALKBH4 in regulating gene expression via DNA methylation.
- To identify proteins affected by ALKBH4 depletion.
Main Methods:
- Quantitative proteomic analysis in HEK293T cells.
- Genetic ablation of ALKBH4.
- Analysis of DNA methylation at gene promoter regions.
Main Results:
- ALKBH4 depletion led to decreased levels of GSTP1 and HSPB1 proteins.
- This decrease correlated with increased DNA (cytosine-5)-methyltransferase 1 (DNMT1) expression.
- Elevated cytosine methylation was observed in the promoter regions of GSTP1 and HSPB1 genes.
Conclusions:
- ALKBH4 plays a role in modulating DNA cytosine methylation.
- ALKBH4 regulates the expression of DNMT1, impacting downstream gene methylation and protein levels.
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