Centriolar satellites regulate CEP350 mRNA stability and centrosome amplification

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• Messenger RNAs (mRNAs) are known to accumulate at centrosomes during cell division and interphase.
• The precise mechanisms controlling mRNA localization and their functional roles at centrosomes are not well understood.
• Centrosomes are crucial organelles involved in cell division and organization.

Purpose of the Study:

• To investigate the mechanisms regulating messenger RNA (mRNA) localization and stability at centrosomes.
• To identify the functional significance of mRNA localization in processes like centriole duplication.
• To explore potential therapeutic targets for conditions involving abnormal centriole duplication.

Main Methods:

• Utilized techniques to study mRNA localization to centrosomes, including microtubule (MT)-dependent assays.
• Identified RNA-binding proteins (RBPs) and centriolar satellite proteins involved in mRNA regulation.
• Investigated the role of specific genes (CEP350, UNK, CEP131) in centriole duplication and overduplication.
• Examined the impact of disrupting the identified pathway in triple-negative breast cancer cells.

Main Results:

• CEP350 mRNA was found to localize to centrosomes in S phase in a microtubule-dependent manner.
• The RNA-binding protein UNK and centriolar satellite protein CEP131 were identified as stabilizers of CEP350 mRNA.
• CEP350 is essential for PLK4-induced centriole overduplication but has minimal impact on normal centriole duplication.
• Disrupting the identified pathway significantly reduced centriole overduplication in triple-negative breast cancer cells.

Conclusions:

• A novel pathway involving RNA-binding proteins (RBPs) and centriolar satellites regulates CEP350 mRNA localization and stability.
• This pathway is critical for supporting centriole overduplication, particularly in cancer cells.
• CEP131 and UNK represent potential therapeutic targets for inhibiting centriole overduplication in triple-negative breast cancer.