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Sonic Hedgehog Pathway Modulation Normalizes Expression of Olig2 in Rostrally Patterned NPCs With Trisomy 21
Jenny A Klein1,2, Zhen Li3, Sanjeev Rampam4
1Graduate Program for Neuroscience, Boston University, Boston, MA, United States.
Frontiers in Cellular Neuroscience
|January 21, 2022
Summary
Down syndrome (trisomy 21) disrupts neural progenitor cell development. Activating the Sonic hedgehog pathway in brain cells with Down syndrome can normalize gene expression and aid neural lineage specification.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Down syndrome is linked to altered brain development, affecting neural progenitor cells (NPCs) and myelination.
- Trisomy 21, the genetic cause of Down syndrome, impacts early neural precursor cell proliferation, differentiation, and fate.
- Understanding these early developmental changes is crucial for addressing cognitive deficits in Down syndrome.
Purpose of the Study:
- To investigate how trisomy 21 affects neural progenitor cells during early brain development.
- To examine the role of the Sonic hedgehog (SHH) pathway in NPC differentiation in Down syndrome models.
- To identify potential therapeutic targets for normalizing neural development in Down syndrome.
Main Methods:
- Differentiated induced pluripotent stem cells from individuals with Down syndrome into brain-like and spinal cord-like NPCs.
- Activated the Sonic hedgehog (SHH) pathway using an agonist (SAG) to promote oligodendroglial differentiation.
- Analyzed the expression of key transcription factors (OLIG2, NKX2.2) essential for oligodendrocyte lineage commitment.
Main Results:
- In brain-like NPCs, trisomy 21 led to upregulated OLIG2 and downregulated NKX2.2, hindering oligodendrocyte differentiation.
- Spinal cord-like NPCs showed no significant differences in OLIG2 or NKX2.2 expression.
- Increased SHH pathway activation normalized gene dysregulation and rescued NPC transition in trisomic brain cells.
Conclusions:
- Gene expression and NPC development in Down syndrome exhibit regional and cell-type specificity.
- Modulating SHH signaling presents a potential strategy to correct early neural lineage specification defects in Down syndrome.
- These findings highlight the importance of targeting developmental pathways for therapeutic interventions in Down syndrome.
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