Kin17 promotes rDNA transcription, ribosomal biogenesis, and cortical lamination

Area of Science:

• Developmental Biology
• Molecular Biology
• Neuroscience

Background:

• Neural progenitor cells (NPCs) require robust ribosomal biogenesis for rapid division during brain development.
• Regulatory mechanisms governing NPC proliferation and ribosomal biogenesis are not fully understood.

Purpose of the Study:

• To investigate the role of the DNA binding protein Kin17 in embryonic brain development.
• To elucidate the molecular mechanisms by which Kin17 influences neural progenitor cell function.

Main Methods:

• Analysis of Kin17 expression during embryonic development in mice.
• Conditional depletion of Kin17 in neural progenitor cells.
• Assessment of brain size, cortical lamination, NPC proliferation, and differentiation.
• Investigation of Kin17's interaction with rDNA promoters and transcription factors.

Main Results:

• Kin17 displays development-dependent expression and is vital for embryonic development; its absence causes lethality.
• Kin17 depletion in NPCs leads to survival but results in reduced brain size and cortical lamination defects.
• Kin17 promotes rDNA transcription by recruiting NCL and Polr1a to rDNA promoter regions.
• This facilitates ribosome biogenesis and protein translation in NPCs.

Conclusions:

• Kin17 plays a critical role in promoting rDNA transcription and ribosomal biogenesis in NPCs during brain development.
• Kin17 is essential for maintaining NPC proliferation and differentiation, thereby ensuring proper cortical lamination.