DDX24 modulates angiogenesis by promoting CCR4-NOT complex-dependent mRNA decay

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• DEAD-box (DDX) RNA helicases are crucial for gene regulation and RNA metabolism.
• Previous research linked DDX24 dysfunction to vascular development issues, but its specific role in angiogenesis was unknown.

Purpose of the Study:

• To elucidate the precise role of DDX24 in RNA metabolism within the context of angiogenesis.
• To identify DDX24-bound messenger RNAs (mRNAs) in endothelial cells.

Main Methods:

• Infrared cross-linking immunoprecipitation sequencing (irCLIP-seq) was employed to identify DDX24-bound mRNAs.
• Functional assays were performed to assess the impact of DDX24 on endothelial cell functions and mRNA targets.

Main Results:

• DDX24 directly binds and regulates specific mRNAs, including CLEC14A and ERG, which are vital for vascular development and angiogenesis.
• DDX24 was found to promote the decay of these target mRNAs.
• This mRNA decay is dependent on the CCR4-NOT deadenylase complex.

Conclusions:

• DDX24 plays a significant role in regulating mRNA stability in endothelial cells.
• DDX24-mediated regulation of mRNA stability is critical for endothelial cell function and angiogenesis.
• These findings highlight DDX24 as a potential therapeutic target for angiogenesis-related diseases.