Chromatin accessibility dynamics in a model of human forebrain development

Area of Science:

• Neuroscience
• Developmental Biology
• Genomics

Background:

• Forebrain development involves complex, synchronized cellular processes critical for normal brain function.
• Perturbations in these processes can lead to various neurological and psychiatric diseases.
• Understanding the gene regulatory mechanisms governing human forebrain development is essential for disease research.

Purpose of the Study:

• To create a comprehensive map of accessible chromatin in human three-dimensional forebrain organoids.
• To investigate the dynamic changes in gene regulation during corticogenesis over an extended period (20 months).
• To identify regulatory elements and transcription factors involved in human forebrain development and their links to disease.

Main Methods:

• Generation of human three-dimensional forebrain organoids.
• Longitudinal sampling of glial and neuronal lineages from dorsal and ventral forebrain organoids.
• Chromatin accessibility assays (e.g., ATAC-seq) to map open chromatin regions.
• Integration of chromatin accessibility data with transcriptomics (e.g., RNA-seq).

Main Results:

• A detailed map of accessible chromatin regions in human forebrain organoids was generated.
• Active chromatin regions found in human brain tissue were identified in organoids across different developmental stages.
• Putative enhancer-gene linkages and key transcription factors regulating human corticogenesis were identified.
• The study identified signatures relevant to neuropsychiatric disorders within the organoid model.

Conclusions:

• The developed organoid platform provides unprecedented insights into gene regulatory dynamics during human forebrain development.
• This resource facilitates the mapping of genetic risk for diseases and exploration of evolutionary conservation.
• The findings offer a valuable tool for studying the molecular basis of neuropsychiatric disorders and human brain development.