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Phenotypic Analysis of Embryos in a Noonan Syndrome Model Mouse With the Rit1 A57G Mutation.

Dai Suzuki1,2, Taiki Abe1, Tetsuya Niihori1

  • 1Department of Medical Genetics, Tohoku University School of Medicine, Sendai, Japan.

Molecular Genetics & Genomic Medicine
|December 13, 2025
PubMed
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RIT1 mutations cause fetal cardiovascular and lymphatic issues in Noonan syndrome. MEK/ERK pathway activation is implicated in cardiac hypertrophy, which can be prevented by inhibiting this pathway.

Area of Science:

  • Genetics and Developmental Biology
  • Cardiovascular Research
  • Lymphatic System Studies

Background:

  • Noonan syndrome is a genetic disorder linked to RAS/MAPK pathway dysregulation.
  • RIT1 mutations are found in Noonan syndrome patients, often with cardiovascular and lymphatic issues.
  • The fetal development of these abnormalities and their prognostic impact is not well understood.

Purpose of the Study:

  • To investigate the cardiovascular and lymphatic phenotypes in RIT1-mutated embryos.
  • To determine the role of MEK/ERK pathway activation in cardiac abnormalities in these embryos.

Main Methods:

  • Examined cardiovascular and lymphatic phenotypes of Rit1A57G/+ embryos.
  • Administered a MEK1/2 inhibitor (PD0325901) to assess its effect on cardiac abnormalities.
Keywords:
MEK1/2 inhibitorNoonan syndromeRit1A57Ghypertrophic cardiomyopathylymphatic vessel

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Main Results:

  • Rit1A57G/+ embryos showed cardiac hypertrophy, pulmonary valve stenosis, and lymphatic vessel expansion at E16.5.
  • Cardiac hypertrophy occurred without cardiomyocyte hypertrophy, alongside progressive cell proliferation.
  • MEK1/2 inhibition prevented cardiac hypertrophy in the affected embryos.

Conclusions:

  • RIT1 mutations lead to cardiovascular and lymphatic abnormalities during fetal development.
  • MEK/ERK pathway activation is a potential mechanism underlying cardiac hypertrophy in RIT1-mutated fetuses.