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METTL3-mediated m6A modification is required for cerebellar development.

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Methyltransferase-like 3 (METTL3) is crucial for mammalian brain development. Its absence causes cerebellar hypoplasia by increasing apoptosis in cerebellar granule cells due to altered RNA stability and splicing.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Neuroscience

Background:

  • N6-methyladenosine (m6A) is the most abundant mRNA modification, vital for biological processes.
  • Methyltransferase-like 3 (METTL3) is a key enzyme in m6A formation.
  • The in vivo role of METTL3 and m6A in mammalian development is largely unknown.

Purpose of the Study:

  • To investigate the in vivo function of METTL3 in mammalian nervous system development.
  • To elucidate the role of m6A modification in cerebellar development.

Main Methods:

  • Conditional knockout (cKO) of Mettl3 in the mouse nervous system.
  • Analysis of cerebellar development and apoptosis in newborn cerebellar granule cells (CGCs).
  • Assessment of RNA half-lives and splicing events upon METTL3 depletion.

Main Results:

  • Mettl3 inactivation in mice led to severe brain developmental defects, specifically cerebellar hypoplasia.
  • Enhanced apoptosis of CGCs in the external granular layer (EGL) was observed in Mettl3 cKO mice.
  • METTL3 depletion resulted in extended RNA half-lives, aberrant splicing, and dysregulated gene expression, causing premature CGC death.

Conclusions:

  • METTL3-mediated m6A RNA methylation is critical for normal mammalian cerebellum development.
  • METTL3 regulates CGC survival by controlling RNA stability and splicing.
  • This study highlights the essential role of m6A epitranscriptomics in neurodevelopment.