Isolation of specific neurons from C. elegans larvae for gene expression profiling

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• The C. elegans nervous system's simple structure is ideal for studying neuronal connectivity and function.
• A detailed gene expression map of C. elegans neurons is crucial for genetic analysis.
• Existing methods require enhancement for precise neuronal gene expression profiling.

Purpose of the Study:

• To introduce a novel method, SeqCeL (RNA-Seq of C. elegans cells), for generating gene expression profiles of specific larval C. elegans neurons.
• To demonstrate the utility of SeqCeL for profiling diverse neuronal classes, including rare cell types.
• To facilitate the identification of genes involved in neuron-specific development and function.

Main Methods:

• Utilized Green Fluorescent Protein (GFP) reporter lines for Fluorescence-Activated Cell Sorting (FACS) isolation of larval C. elegans neurons.
• Applied RNA-Sequencing (RNA-Seq) to analyze the gene expression profiles of isolated neurons.
• Successfully profiled rare NSM serotonergic neurons, a single bilateral pair in the C. elegans pharynx.

Main Results:

• SeqCeL is applicable to diverse classes of C. elegans neurons.
• RNA-Seq analysis of NSM neurons detected over 1,000 enriched transcripts.
• The identified transcripts included the majority of previously known NSM-expressed genes, validating the method's sensitivity.

Conclusions:

• SeqCeL provides a simple and robust protocol for expression profiling of post-embryonic C. elegans neurons.
• This method is a valuable tool for identifying candidate genes critical for neuron-specific development and function.
• The approach enhances the ability to genetically dissect neuronal circuits in C. elegans.