Excitatory Neurons Derived from Human-Induced Pluripotent Stem Cells Show Transcriptomic Differences in Alzheimer's...

Area of Science:

• Neuroscience
• Genetics
• Stem Cell Biology

Background:

• Induced pluripotent stem cells (iPSCs) offer a model to study diseases like Alzheimer's (AD) without confounding factors.
• Advances in stem cell technology enable the generation of patient-specific cell types for disease modeling.

Purpose of the Study:

• To generate and analyze iPSCs derived from Alzheimer's disease (AD) patients and healthy controls.
• To identify transcriptomic differences in neurons derived from AD patients compared to controls.
• To explore potential biological subtypes within AD based on gene expression patterns.

Main Methods:

• Generation of iPSCs from eight AD patients and six controls.
• Lentiviral differentiation of iPSCs into excitatory glutamatergic neurons.
• RNA sequencing and comparative transcriptome analysis.
• Bioinformatic analysis including Uniform Manifold Approximation and Projection (UMAP).

Main Results:

• Identified 621 differentially expressed genes (adjusted p < 0.05) between AD and control neurons.
• Found significant overlap and concordance with existing AD transcriptomic studies.
• Discovered five AD-associated genes from genome-wide association studies within the differentially expressed set.
• Observed enrichment of protein-protein interactions among these genes via STRING database analysis.
• UMAP analysis suggested distinct patient clusters based on gene expression, potentially correlating with clinical differences.

Conclusions:

• Patient-derived iPSC-derived neurons reveal distinct molecular signatures in Alzheimer's disease.
• Gene expression patterns highlight potential functional networks and identify AD-associated genes.
• Distinct transcriptomic clusters suggest the existence of clinically relevant biological subtypes in AD.
• These findings pave the way for precision medicine approaches in Alzheimer's disease treatment.