BRN1/2 Function in Neocortical Size Determination and Microcephaly

Area of Science:

• Evolutionary biology
• Neuroscience
• Developmental biology

Background:

• Mammalian neocortex size and complexity vary significantly across species.
• The evolutionary mechanisms driving increased brain size remain largely unknown.

Approach:

• Investigated the role of two specific transcription factors in regulating neocortical progenitor cells.
• Conducted comparative studies in mice, ferrets, and macaques to assess evolutionary conservation.
• Analyzed gene expression changes and their link to microcephaly.

Key Points:

• Two transcription factors coordinate gene expression in neocortical progenitors.
• These factors regulate progenitor proliferation and neuronal output, determining brain size.
• Their function is evolutionarily conserved across diverse mammalian species.

Conclusions:

• Transcriptional regulation is crucial for determining mammalian brain size.
• Deregulation of these transcription factors is implicated in the molecular pathogenesis of microcephaly.
• Genetic manipulation of these factors results in severe microcephaly.