FOXP genes regulate Purkinje cell diversity and cerebellar morphogenesis

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Purkinje cells (PCs) are vital for motor control and learning.
• The molecular basis of PC heterogeneity and its developmental role are not fully understood.

Purpose of the Study:

• To identify and characterize molecularly distinct Purkinje cell subtypes in the embryonic cerebellum.
• To investigate the role of Foxp transcription factors in PC diversification and cerebellar development.

Main Methods:

• Single-cell RNA sequencing (scRNA-seq) to profile embryonic mouse cerebellar cells.
• Spatial reconstruction to map PC subtype distribution.
• Genetic manipulation (Foxp1/Foxp2 deletion) to assess functional impact.

Main Results:

• Identified at least 11 distinct PC subtypes based on gene expression profiles.
• Discovered that Foxp1, Foxp2, and Foxp4 combinatorially define PC subtype identity.
• Demonstrated that Foxp1/Foxp2 deletion impairs PC diversification and cerebellar hemisphere formation.
• Observed enrichment of Foxp1+ PCs in fetal human cerebellum, suggesting evolutionary significance.

Conclusions:

• Early embryonic development involves significant diversification of Purkinje cells into distinct molecular subtypes.
• Foxp1+ PCs are essential regulators of cerebellar hemispheric development and patterning.
• The findings provide insights into the evolution of cerebellar circuitry.