Landscape of ribosome-engaged transcript isoforms reveals extensive neuronal-cell-class-specific alternative splicing...

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Neuronal cell types possess unique properties determined by molecular programs.
• Alternative splicing expands molecular repertoires, influencing neuronal function.
• Understanding alternative splicing across neuron types is crucial but limited.

Purpose of the Study:

• To systematically map ribosome-associated transcript isoforms in genetically defined mouse forebrain neuron types.
• To investigate the role of alternative splicing in the functional specification of neuronal cell types.

Main Methods:

• Ribosome-associated transcript isoform mapping.
• Analysis of transcript diversity in genetically defined neuron types.
• Comparative analysis across major neuron classes in the mouse hippocampus and neocortex.

Main Results:

• Generated an extensive dataset of transcript diversity across major neuron classes.
• Demonstrated that neuronal transcript isoform profiles can distinguish closely related cell types, including pyramidal cells and inhibitory interneurons.
• Identified highly specific alternative splicing programs that regulate synaptic proteins and intrinsic neuronal properties.

Conclusions:

• Transcript diversification via alternative splicing is a fundamental mechanism for specifying neuronal cell types.
• Alternative splicing programs are precisely organized across neuron types, contributing to functional specialization.
• This work provides a resource for understanding neuronal diversity and function.