O-GlcNAc Transferase - An Auxiliary Factor or a Full-blown Oncogene?

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• O-linked N-acetyl-d-glucosamine (O-GlcNAc) is a posttranslational modification catalyzed by O-GlcNAc transferase (OGT).
• Elevated OGT expression is observed in most human cancers, correlating with increased cancer cell proliferation.
• OGT influences cell phenotype, enhancing reprogramming efficiency and indicating specific cancer dependencies.

Purpose of the Study:

• To review the role of OGT in cancer progression.
• To explore the potential of targeting OGT as a cancer therapy strategy.
• To highlight the need for mechanistic insights and targeted inhibitors for OGT.

Main Methods:

• Review of existing literature on OGT function in cancer.
• Analysis of OGT's role in regulating cancer-associated proteins (e.g., MYC, FOXM1, EZH2).
• Discussion of genome-wide screens identifying OGT-dependent cancers.

Main Results:

• OGT inhibition decreases cancer cell proliferation through modification of key regulators.
• OGT overexpression can enhance cellular reprogramming.
• Certain cancers exhibit a strong dependence on OGT activity.

Conclusions:

• Targeting OGT presents a potential therapeutic strategy for various cancers.
• Understanding OGT substrate specificity and developing specific inhibitors are crucial for effective therapy.
• Despite potential on-target effects, OGT inhibitors show selective antiproliferative activity and can synergize with other treatments.