Generation of an induced pluripotent stem cell line from a Huntington's disease patient with a long HTT-PolyQ...

Area of Science:

• Neurodegenerative Diseases
• Stem Cell Biology
• Genetics

Background:

• Huntington's disease (HD) is an inherited neurodegenerative disorder.
• It results from expanded CAG repeats in the Huntingtin gene (HTT), causing an elongated poly-glutamine (poly-Q) tract in the huntingtin protein.
• Juvenile onset HD presents a severe form of the disease.

Purpose of the Study:

• To generate induced pluripotent stem cells (iPSCs) from a patient with juvenile onset Huntington's disease.
• To characterize these patient-derived iPSCs for pluripotency and genetic integrity.
• To establish a cellular model for studying HD pathogenesis and potential therapies.

Main Methods:

• Fibroblasts from an HD patient were reprogrammed into iPSCs using non-integrative Sendai virus.
• The generated iPSCs were analyzed for pluripotency markers and karyotype.
• Directed differentiation was performed to assess the potential of iPSCs to form derivatives of the three germ layers.
• Polymerase Chain Reaction (PCR) and sequencing were used to confirm the presence and length of CAG repeats in the HTT gene.

Main Results:

• Reprogrammed iPSCs expressed key pluripotency markers.
• The iPSC line exhibited a normal karyotype.
• Directed differentiation successfully generated cell types from all three germ layers.
• Genetic analysis confirmed the presence of both a normal HTT allele and an expanded CAG repeat allele (≥180Q) in the patient-derived iPSCs.

Conclusions:

• Patient-derived iPSCs successfully model Huntington's disease, retaining the characteristic expanded CAG repeats.
• These iPSCs serve as a valuable tool for investigating HD mechanisms and developing therapeutic strategies.
• The ability to differentiate these iPSCs into various cell types facilitates disease modeling in relevant cellular contexts.