Generating a Cell Model to Study ER Stress in iPSC-Derived Medium Spiny Neurons from a Patient with Huntington's...

Area of Science:

• Neuroscience
• Genetics
• Stem Cell Biology

Background:

• Induced pluripotent stem cells (iPSCs) are crucial for disease modeling and drug discovery.
• Huntington's disease (HD) is a neurodegenerative disorder with complex genetic mechanisms.
• Understanding cellular pathology in HD requires robust patient-specific models.

Purpose of the Study:

• To generate and characterize patient-specific iPSC lines from an individual with Huntington's disease.
• To establish a cellular model for studying HD progression and molecular pathology in vitro.
• To investigate endoplasmic reticulum (ER) stress in iPSC-derived neurons from HD patients.

Main Methods:

• Reprogramming peripheral blood mononuclear cells from an HD patient into iPSCs using episomal vectors.
• Characterization of iPSC pluripotency, karyotype, and differentiation potential.
• Introduction of a genetically encoded biosensor (XBP1-TagRFP) to monitor ER stress.

Main Results:

• Three stable iPSC lines were generated, expressing pluripotency markers, possessing normal karyotypes, and differentiating into three germ layers.
• iPSC-derived medium spiny neurons exhibited ER stress.
• The IRE1-mediated pathway did not appear to be involved in the observed ER stress.

Conclusions:

• Generated HD patient-specific iPSCs provide a valuable tool for in vitro disease modeling.
• iPSC-derived neurons from HD patients develop ER stress, contributing to understanding disease pathogenesis.
• The findings suggest alternative pathways may underlie ER stress in HD, distinct from the IRE1 pathway.