Renshaw cell interneuron specialization is controlled by a temporally restricted transcription factor program.

Area of Science:

• Neuroscience
• Developmental Biology
• Molecular Biology

Background:

• The spinal cord exhibits diverse interneuron cell types crucial for sensory perception and motor control.
• Mechanisms generating these specialized interneurons from progenitor cells remain largely unknown.

Purpose of the Study:

• To elucidate the transcriptional program governing Renshaw cell (RC) differentiation.
• To identify key transcription factors and temporal dynamics involved in RC development.

Main Methods:

• Analysis of gene expression patterns during V1 interneuron neurogenesis.
• Investigating the roles of Onecut (Oc1, Oc2) and Foxd3 transcription factors in RC development.

Main Results:

• A temporally regulated transcriptional program controls RC differentiation.
• Selective activation of Oc1 and Oc2 during early V1 interneuron neurogenesis is essential for RC fate.
• Foxd3 also plays a role in RC development, with broader expression in postmitotic V1 interneurons.

Conclusions:

• Renshaw cells differentiate within a specific temporal window, activating Oc1 and Oc2.
• Neuronal diversity in the spinal cord is established by the combined action of early spatial and temporal factors.