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HTT loss-of-function contributes to RNA deregulation in developing Huntington's disease neurons.

Emilia Kozłowska1, Agata Ciołak1, Grażyna Adamek2

  • 1Department of Medical Biotechnology, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego Str. 12/14, Poznań, 61-704, Poland.

Cell & Bioscience
|July 9, 2025
PubMed
Summary
This summary is machine-generated.

Huntington's disease (HD) involves gene and miRNA expression changes in neuronal cells, driven by huntingtin protein (HTT) deficiency, not a gain-of-function mutation. This impacts early transcriptional regulation in the developing brain.

Keywords:
Huntington’s diseaseLoss-of-function mechanismTranscription factorsiPSC-derived neuronsmiRNAs

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder caused by CAG repeat expansion in the HTT gene.
  • Transcriptional dysregulation is an early molecular mechanism in HD pathogenesis, evident even in the developing brain.

Purpose of the Study:

  • To identify networks of deregulated RNAs critical for initial transcriptional changes in HD and HTT-deficient neuronal cells.

Main Methods:

  • RNA sequencing (including small RNAs) was performed on isogenic human neural stem cells.
  • Results were validated using additional methods, rescue experiments, and in medium spiny neuron-like cells.

Main Results:

  • Significant gene expression and miRNA dysregulation were observed in HD and HTT-knockout (HTT-KO) cell lines.
  • Upregulated genes were enriched in DNA binding and transcription regulation, including transcription factors like TWIST1, SIX1, and FOXD1.
  • Consistently deregulated miRNAs (miR-214, miR-199, miR-9) were identified, potentially regulating TWIST1 and HTT expression.

Conclusions:

  • Transcriptional deregulation in early-stage HD is primarily attributed to a deficiency in functioning huntingtin protein (HTT).
  • This suggests a loss-of-function mechanism rather than a typical gain-of-function in early HD pathogenesis.