FOXR2 Targets LHX6+/DLX+ Neural Lineages to Drive Central Nervous System Neuroblastoma

Area of Science:

• Neuro-oncology
• Developmental Neuroscience
• Genomics

Background:

• Central nervous system neuroblastoma with FOXR2 activation (NB-FOXR2) is a rare, high-grade brain tumor with mixed neuronal and glial markers.
• The cellular origin and oncogenesis of NB-FOXR2 remain poorly understood, hindering diagnosis and therapeutic development.

Purpose of the Study:

• To determine the cellular origin of NB-FOXR2 tumors.
• To elucidate the role of FOXR2 in the genesis of these tumors.
• To develop a relevant in vivo model for studying NB-FOXR2.

Main Methods:

• Transcriptome profiling (bulk and single-cell) of human NB-FOXR2 tumors.
• Integration of tumor profiles with single-cell reference datasets of the normal brain.
• In vivo genetic manipulation of Foxr2 in mouse models.
• Chromatin immunoprecipitation sequencing (ChIP-seq) to identify FOXR2 binding sites.

Main Results:

• NB-FOXR2 tumors originate from LHX6+/DLX+ interneuron lineages derived from the medial ganglionic eminence.
• In vivo prenatal Foxr2 targeting in mice recapitulated human NB-FOXR2 molecular signatures and induced cortical tumors.
• FOXR2 directly binds to transcription factors involved in gliogenesis, suggesting a mechanism for the mixed glial features.

Conclusions:

• NB-FOXR2 tumors arise from a distinct interneuron lineage, susceptible to FOXR2-driven oncogenesis.
• FOXR2 activation promotes glial programs, explaining the dual marker expression in these tumors.
• Systematic profiling of brain development aids in creating accurate in vivo models for rare pediatric brain tumors and therapeutic development.