Accelerating Gene Discovery by Phenotyping Whole-Genome Sequenced Multi-mutation Strains and Using the Sequence...

Area of Science:

• Genetics
• Cell Biology
• Developmental Biology

Background:

• Forward genetic screens are powerful but gene identification is a bottleneck.
• Reverse genetic screens have limitations in scope.
• Ciliated sensory neuron dye-filling defects are linked to cilia dysfunction and human diseases.

Purpose of the Study:

• To develop an innovative and rapid gene discovery approach.
• To identify novel genes involved in C. elegans ciliated sensory neuron dye-filling.
• To investigate the role of newly identified genes in cilia function and their link to human diseases.

Main Methods:

• Utilized a whole-genome sequenced multi-mutation library from the Million Mutation Project in C. elegans.
• Employed the Sequence Kernel Association Test (SKAT) for rapid gene screening.
• Phenotypic analysis focused on dye-filling defects in ciliated sensory neurons.

Main Results:

• Identified known and three novel genes associated with dye-filling defects.
• Confirmed the function of BGNT-1.1 in ciliated sensory neuron morphogenesis and dye-filling.
• BGNT-1.1 acts in a cell non-autonomous manner from the trans-Golgi network.

Conclusions:

• The developed SKAT-based approach is effective for rapid gene discovery.
• BGNT-1.1 is a novel gene involved in ciliated sensory neuron function.
• The findings suggest Walker-Warburg syndrome, linked to BGNT-1.1, may be a ciliopathy.