RNA-seq analysis reveals significant transcriptome changes in huntingtin-null human neuroblastoma cells

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• Huntington's disease (HD) is a fatal neurodegenerative disorder caused by mutations in the Huntingtin (Htt) gene.
• Normal Htt protein is crucial for embryonic development but its role in adult tissues is less understood.
• Transcriptional dysregulation is a key pathogenic mechanism in HD, yet the direct role of normal Htt in transcription remains unclear.

Purpose of the Study:

• To investigate the direct transcriptional role of normal Huntingtin (Htt) protein.
• To understand the molecular consequences of Htt deletion in adult neuronal cells.
• To identify genes and pathways regulated by normal Htt.

Main Methods:

• Utilized CRISPR-Cas9 gene editing to create Htt-null human neuroblastoma SH-SY5Y cells.
• Performed RNA-sequencing (RNA-Seq) to analyze global transcriptome changes in Htt-null versus wild-type cells.
• Conducted bioinformatic analysis of differentially expressed genes (DEGs) and validated key findings using quantitative RT-PCR.

Main Results:

• Htt deletion led to widespread changes in gene transcription, affecting pathways related to cell communication, signaling, neuron development, neurotransmission, and synaptic signaling.
• Htt-null cells exhibited significantly slower proliferation compared to wild-type cells, consistent with disrupted developmental pathways.
• Identified potential transcription factors involved in Htt-mediated gene regulation.

Conclusions:

• Normal Htt protein plays a significant role in regulating gene transcription in adult neuronal cells.
• The loss of Htt impacts crucial cellular functions, including development, signaling, and proliferation.
• This study provides insights into Htt-mediated transcriptional regulation and its implications for Huntington's disease pathogenesis.