Stem cell-based region-specific brain organoids: Novel models to understand neurodevelopmental defects

Area of Science:

• Neuroscience
• Developmental Biology
• Stem Cell Research

Background:

• Human brain development and neurodevelopmental defects are complex and challenging to study.
• Advances in in vitro human brain organoid development offer new possibilities for understanding these processes.
• Human brain organoids are 3D, stem-cell-derived tissues that mimic the developing fetal brain.

Purpose of the Study:

• To review the fundamentals of brain organoid development and their applications.
• To highlight the potential of brain organoids in studying human brain development.
• To discuss the use of organoids in understanding neurodevelopmental defects and for drug screening.

Main Methods:

• Reprogramming human somatic cells into induced pluripotent cells (iPSCs).
• Targeted differentiation of iPSCs into neural progenitor cells.
• Three-dimensional differentiation to generate region-specific brain organoids (cortical, forebrain, pallium, subpallium).

Main Results:

• Directed differentiation of iPSCs yields self-organizing neural progenitor cells forming brain-like tissue.
• Development of specialized region-specific brain organoid models.
• Brain organoids serve as novel models for studying development, defects, toxicity, and drug screening.

Conclusions:

• Stem cell-based brain organoids are powerful tools for investigating human brain development.
• These organoids are crucial for understanding mechanisms of neurodevelopmental disorders like microcephaly and lissencephaly.
• Brain organoids facilitate chemical toxicity testing and drug repurposing screening.