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In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells

In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells

Published on: March 7, 2025

Using mouse models to explore genotype-phenotype relationship in Down syndrome.

Ahmad Salehi¹, Mehrdad Faizi, Pavel V Belichenko

¹Department of Neurology and Neurological Sciences, Neuroscience Institute at Stanford, Stanford University, Stanford, California 94305, USA. asalehi@stanford.edu

Mental Retardation and Developmental Disabilities Research Reviews

|October 3, 2007

Summary

Down syndrome (DS) involves multiple organs due to trisomy 21. Studies reveal that increased amyloid precursor protein (App) gene dosage in DS mouse models causes failed nerve growth factor (NGF) signaling and neurodegeneration.

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Area of Science:

Genetics
Neuroscience
Developmental Biology

Background:

Down syndrome (DS), caused by trisomy 21, presents diverse phenotypes affecting multiple organs.
Understanding genotype-phenotype relationships in DS is crucial for elucidating pathophysiology and developing therapies.

Purpose of the Study:

To explore genotype-phenotype relationships in DS, particularly concerning nervous system abnormalities.
To investigate the link between gene dosage on human chromosome 21 (HSA21) and DS phenotypes using mouse models.

Main Methods:

Utilizing genetically defined mouse models of DS.
Sequencing HSA21 and its mouse orthologues to identify relevant genes.
Investigating the impact of amyloid precursor protein (App) gene dosage on nerve growth factor (NGF) signaling.

Main Results:

A mouse model of DS demonstrated that increased App gene dosage is associated with failed NGF signaling.
This overexpression led to cholinergic neurodegeneration, a key feature in DS nervous system abnormalities.

Conclusions:

Elucidating genotype-phenotype relationships, especially from defined phenotypes to responsible genes, enhances understanding of DS.
These findings contribute to understanding the molecular basis of DS and potential therapeutic targets.