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Basic Science and Pathogenesis.

Andrea Suárez1, Alexandra N Melloni2,3,4, Bradley T Hyman2,3,4,5,6,7

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This summary is machine-generated.

Researchers created Alzheimer's disease (AD) patient models using stem cells to study a CASP8 gene variant. CRISPR gene editing successfully removed the variant in cells, paving the way for therapeutic research in AD.

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Area of Science:

  • Neuroscience
  • Genetics
  • Stem Cell Biology

Background:

  • Alzheimer's disease (AD) is a leading cause of dementia with complex genetic underpinnings.
  • A CASP8 repeat expansion variant (CASP8-GGGAGA-AD-R1) is linked to increased AD risk.
  • The precise role of this CASP8 variant in AD pathogenesis requires further investigation.

Purpose of the Study:

  • To develop and utilize patient-derived induced pluripotent stem cells (iPSCs) to investigate the pathogenic mechanisms of the CASP8-GGGAGA-AD-R1 variant in Alzheimer's disease.
  • To establish isogenic cell lines with the CASP8 variant precisely edited using CRISPR/Cas9 technology.
  • To analyze disease-relevant molecular and pathogenic phenotypes in neuronal cultures derived from these models.

Main Methods:

  • Generation of iPSCs from AD patients with and without the CASP8-GGGAGA-AD-R1 variant, and from control individuals.
  • Development of CRISPR/Cas9 systems for targeted excision of the CASP8-GGGAGA-AD-R1 repeat expansion.
  • Validation of CRISPR/Cas9 editing efficiency in HEK293T cells and iPSCs through fluorescence markers and long-range PCR.

Main Results:

  • Successfully generated iPSC lines from AD patients and controls, confirming pluripotency and normal karyotypes.
  • Demonstrated successful expression and function of CRISPR/Cas9 components for targeting the CASP8 repeat expansion locus.
  • Confirmed efficient excision of the CASP8 repeat expansion in HEK293 cells using the developed CRISPR/Cas9 system.

Conclusions:

  • Patient-derived iPSC models and CRISPR/Cas9 technology provide a powerful platform for studying the CASP8-GGGAGA-AD-R1 variant in AD.
  • Efficient in vitro excision of the CASP8 mutation was achieved, validating the gene editing approach.
  • Future studies will assess the therapeutic potential of removing the mutation to mitigate AD phenotypes and elucidate disease mechanisms.