Two opposing gene expression patterns within ATRX aberrant neuroblastoma.

Area of Science:

• Pediatric Oncology
• Cancer Genomics
• Molecular Biology

Background:

• Neuroblastoma is a common childhood extracranial solid tumor.
• High-risk neuroblastoma often involves aberrations in the ATRX chromatin remodeler.
• Multi-exon deletions (MEDs) are the most frequent ATRX aberrations in neuroblastoma, unlike point mutations in other cancers.

Purpose of the Study:

• To investigate the molecular consequences of ATRX aberrations in neuroblastoma.
• To create and analyze novel isogenic ATRX aberrant models.
• To identify distinct molecular expression patterns in ATRX-aberrant neuroblastomas.

Main Methods:

• CRISPR-Cas9 gene editing to create isogenic ATRX aberrant neuroblastoma models.
• Total RNA sequencing of engineered cell lines, tumoroids, and patient-derived models.
• Gene Set Enrichment Analysis (GSEA) to identify differential gene expression patterns.

Main Results:

• Decreased expression of ribosome biogenesis and metabolic genes observed in exon 2-10 MED models and patient data.
• Conversely, increased expression of these processes noted in ATRX knock-out and exon 2-13 MED models.
• Validated ATRX's role in regulating ribosome homeostasis.

Conclusions:

• Two distinct molecular expression patterns exist within ATRX-aberrant neuroblastomas.
• These distinct patterns suggest a potential need for tailored treatment regimens for high-risk neuroblastoma patients.
• Further research into ATRX function and its impact on neuroblastoma subtypes is warranted.