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In Utero Electroporation of Multiaddressable Genome-Integrating Color MAGIC Markers to Individualize Cortical Mouse Astrocytes

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Astrocyte allocation during brain development is controlled by Tcf4-mediated fate restriction.

Yandong Zhang¹, Dan Li¹, Yuqun Cai¹

¹Department of Anesthesia, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, and Zhongshan Hospital, Fudan University, Shanghai, 200032, China.

The EMBO Journal

|September 19, 2024

Summary

Transcription factor 4 (Tcf4) controls astrocyte distribution in the developing brain by restricting cell fate. Loss of Tcf4 leads to mislocalized astrocytes, impacting brain development and potentially neurodevelopmental disorders.

Keywords:

Astrocyte Allocation Fate-restriction Gliogenesis Pitt-Hopkins Syndrome Transcription Factor 4

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Area of Science:

Neuroscience
Developmental Biology
Cell Biology

Background:

Astrocytes display regional heterogeneity crucial for brain function.
Mechanisms governing astrocyte distribution and regional specificity are not fully understood.

Purpose of the Study:

To elucidate the role of transcription factor 4 (Tcf4) in astrocyte allocation during brain development.
To investigate how Tcf4 influences cell fate decisions in neural progenitor cells.

Main Methods:

Utilized genetic manipulation to study the function of Tcf4 in neural progenitor cells.
Examined cell fate changes in oligodendrocyte precursor cells upon Tcf4 loss.
Assessed the integration and characteristics of mislocalized astrocytes in the neocortex.

Main Results:

Loss of Tcf4 in ventral telencephalic progenitors resulted in oligodendrocyte precursor cells adopting an intermediate astrocyte precursor fate.
Ectopic astrocytes were observed in the dorsal neocortex, integrating with neurons and acquiring regional features.
Tcf4 acts as a suppressor of astrocyte fate in ventral-derived oligodendrocyte precursor cells, ensuring lineage restriction.

Conclusions:

Tcf4 is critical for the precise allocation of astrocytes to specific brain regions based on embryonic origin.
Tcf4's role in fate restriction is essential for maintaining regional astrocyte identity.
Dysregulation of Tcf4 may contribute to neurodevelopmental disorders associated with astrocyte mislocalization.