Tox: a multifunctional transcription factor and novel regulator of mammalian corticogenesis

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Neural stem cell proliferation is crucial for brain development.
• Specific genes regulate the transition from stem cell division to neuron production.
• The transcription factor Tox's role in the nervous system is largely unknown.

Purpose of the Study:

• To investigate the function of Tox during mammalian corticogenesis.
• To characterize Tox's expression patterns and regulatory mechanisms.
• To identify Tox's chromatin binding properties and transcriptional targets.

Main Methods:

• Detailed expression analysis of Tox at tissue, cellular, and temporal levels.
• Investigated Tox regulation via calcineurin/Nfat signaling pathway.
• Utilized DNA adenine methyltransferase identification (DamID) coupled with deep sequencing to map Tox binding sites and identify targets.
• Manipulated Tox levels in the developing brain to assess functional consequences.

Main Results:

• Tox expression is regulated by calcineurin/Nfat signaling.
• DamID-seq identified Tox's chromatin binding motif and downstream targets, including Sox2, Tbr2, and Prox1.
• Tox manipulation demonstrated its role in enhancing neural stem cell proliferation.
• Tox was shown to promote neurite outgrowth in newborn neurons.

Conclusions:

• Tox is a novel key regulator in mammalian brain development.
• Tox plays multiple roles, including promoting neural stem cell proliferation and neurite outgrowth.
• The findings provide a resource for studying Tox in other tissues and its broader implications in neurodevelopment.