A high-resolution enhancer atlas of the developing telencephalon

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• The mammalian telencephalon is vital for complex cognitive, motor, and emotional functions.
• While genes for telencephalon development are known, their regulatory sequences are largely uncharacterized.
• Understanding gene regulation is key to deciphering brain development and disorders.

Purpose of the Study:

• To create a comprehensive digital atlas of in vivo enhancers in the developing telencephalon.
• To identify and characterize novel regulatory elements controlling gene expression in the embryonic forebrain.
• To provide a resource for studying gene regulation in neurodevelopment.

Main Methods:

• Identification of over 4,600 candidate embryonic forebrain enhancers.
• In vivo validation of 329 enhancers in transgenic mouse embryos.
• Generation of over 32,000 histological brain sections for 145 enhancers, creating a web-based data collection.
• Comparative epigenomic analysis of human and mouse cortex for genome-wide enhancer architecture.

Main Results:

• A digital atlas of in vivo enhancers active in specific telencephalon subregions was established.
• Validated enhancers provide insights into gene expression control during forebrain development.
• Comparative analysis revealed conserved and divergent enhancer architecture between human and mouse cortex.
• A publicly accessible database of over 32,000 brain sections was created.

Conclusions:

• The digital atlas serves as a foundational resource for understanding telencephalon development.
• These findings facilitate research into gene regulatory mechanisms underlying brain formation.
• The data supports investigations into the role of enhancers in neurodevelopmental disorders.