LncRNA RUS shapes the gene expression program towards neurogenesis.

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Brain complexity evolution is linked to increased long noncoding RNA (lncRNA) expression in neural tissues.
• lncRNAs can scaffold epigenetic regulators, but their role in brain development is understudied.
• Few lncRNAs have been functionally characterized for their roles in neurodevelopment.

Purpose of the Study:

• To functionally characterize the lncRNA LINC01322, termed RUS (RNA upstream of Slitrk3), in neural development.
• To investigate the role of RUS in neuronal differentiation and its association with epigenetic regulators.

Main Methods:

• Functional characterization of LINC01322 (RUS) in mouse embryonic cortical neural stem cells.
• Depletion of RUS using gene silencing techniques.
• Analysis of gene expression changes and cell cycle progression upon RUS depletion.
• Chromatin association studies and identification of interacting epigenetic regulators.

Main Results:

• RUS is conserved in mammals, adjacent to the neurodevelopmental gene Slitrk3, and exclusively expressed in neural cells.
• RUS expression increases during neuronal differentiation.
• RUS depletion arrests neuronal precursors in an intermediate state, causing cell cycle arrest and increased apoptosis.
• RUS associates with chromatin near neurogenesis genes, influencing their expression, and interacts with epigenetic regulators.

Conclusions:

• RUS plays a critical role in regulating neuronal differentiation and preventing cell cycle arrest and apoptosis.
• The lncRNA RUS acts as a scaffold for epigenetic regulators, mediating context-dependent gene activation and repression during neurogenesis.