A developmental gene regulatory network for C. elegans anchor cell invasion

Area of Science:

• Developmental Biology
• Cellular Biology
• Genetics

Background:

• Cellular invasion is crucial for development, immunity, and disease.
• The Caenorhabditis elegans anchor cell invasion model is used to study cell invasion.
• Four transcription factors (fos-1, egl-43, hlh-2, nhr-67) are known to mediate anchor cell specification and invasion.

Purpose of the Study:

• To characterize the gene regulatory network promoting cell invasion.
• To understand the interactions of transcription factors before and after anchor cell specification.
• To elucidate the connection between transcription factors and the cell biology they regulate.

Main Methods:

• Utilized an in vivo model of Caenorhabditis elegans anchor cell invasion.
• Employed genome editing and RNA interference techniques.
• Examined transcription factor interactions at different stages of anchor cell development.

Main Results:

• Transcription factors initially function independently to regulate Notch signaling.
• Post-specification, egl-43, hlh-2, and nhr-67 act in parallel with fos-1.
• A type I coherent feed-forward loop with positive feedback promotes invasion.
• The same transcription factors regulate both cell fate specification and invasive behavior.

Conclusions:

• A gene regulatory network can be rapidly assembled to promote a pro-invasive state.
• Transcription factors play dual roles in cell fate specification and differentiated cell behavior.
• This network provides insights into the mechanisms of cellular invasion in development and disease.