METTL3-Dependent N6-Methyladenosine Modification Programs Human Neural Progenitor Cell Proliferation

Area of Science:

• Epigenetics
• Developmental Neuroscience
• RNA Biology

Background:

• METTL3 is a key methyltransferase for N6-methyladenosine (m6A) modification.
• m6A plays regulatory roles in mammalian central nervous system (CNS) development.
• Specific epigenetic mechanisms in human CNS development are not fully understood.

Purpose of the Study:

• To investigate the role of METTL3 in human neural progenitor cell (hNPC) formation, differentiation, and proliferation.
• To elucidate the epigenetic mechanisms underlying METTL3 function in human CNS development.

Main Methods:

• Generated small-molecule-assisted shut-off (SMASh)-tagged human embryonic stem cell (hESC) lines to reduce METTL3 levels.
• Assessed hNPC formation and neuron differentiation.
• Quantified hNPC proliferation and SLIT2 expression.
• Analyzed m6A enrichment in SLIT2 mRNA.

Main Results:

• METTL3 is not essential for hNPC formation or neuron differentiation.
• METTL3 deficiency inhibited hNPC proliferation.
• This inhibition was linked to reduced SLIT2 expression.
• METTL3 degradation decreased m6A enrichment in SLIT2 mRNA, leading to lower expression.

Conclusions:

• METTL3 is critical for hNPC proliferation, not initial formation or differentiation.
• SLIT2 is a novel functional target of METTL3 in hNPCs.
• This study enhances understanding of m6A-dependent mechanisms in hNPC proliferation.