Ythdf2-mediated m⁶A mRNA clearance modulates neural development in mice.

Area of Science:

• Molecular Biology
• Developmental Neuroscience
• Epigenetics

Background:

• N⁶-methyladenosine (m⁶A) is a dynamic mRNA modification regulating development.
• The Mettl3-Mettl14 complex writes m⁶A marks, essential for cortical neurogenesis.
• Ythdf2, an m⁶A reader, facilitates mRNA degradation by recruiting decay machinery.

Purpose of the Study:

• To investigate the role of Ythdf2 in embryonic neural development.
• To understand the impact of Ythdf2 depletion on neural stem/progenitor cells (NSPCs) and neurogenesis.

Main Methods:

• Conditional depletion of Ythdf2 in mice.
• In vivo and in vitro assays on embryonic neocortex and NSPCs.
• m⁶A-methylome analysis of Ythdf2-deficient NSPCs.

Main Results:

• Ythdf2 depletion causes embryonic lethality and compromised neural development.
• Loss of Ythdf2 severely impacts NSPC self-renewal, neuron generation, proliferation, and differentiation.
• Ythdf2-deficient neurons exhibit impaired neurite outgrowth and reduced recovery from oxidative stress.
• Ythdf2 deficiency leads to delayed degradation of neuron differentiation-related mRNAs and altered expression of JAK-STAT pathway genes.

Conclusions:

• Ythdf2 is essential for proper embryonic neural development.
• Ythdf2 regulates neural development by promoting m⁶A-dependent mRNA degradation.
• Ythdf2's function is critical for NSPC maintenance and neuronal maturation.