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Related Experiment Videos

Aberrant HRAS transcript processing underlies a distinctive phenotype within the RASopathy clinical spectrum.

Francesca Pantaleoni1, Dorit Lev2,3, Ion C Cirstea4,5

  • 1Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy.

Human Mutation
|April 9, 2017
PubMed
Summary

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A novel HRAS gene deletion causes a rare RASopathy with developmental delay and distinct facial features. This genetic alteration affects gene processing, leading to altered protein function and a unique patient phenotype.

Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • RASopathies are a group of rare genetic disorders characterized by developmental and growth abnormalities.
  • These conditions arise from germline mutations in genes within the RAS signaling network.
  • Common features include dysmorphic facial features, short stature, cognitive deficits, and increased cancer risk.

Observation:

  • A de novo 10-nucleotide deletion in the HRAS gene (c.481_490delGGGACCCTCT) was identified.
  • This deletion impacts HRAS transcript processing, leading to the retention of exon IDX.
  • The altered transcript results in a stable HRAS protein with mild hyperactivity and constitutive plasma membrane targeting.

Findings:

  • The identified HRAS deletion represents a novel mechanism underlying RASopathies.
Keywords:
Costello syndromeHRASRAS signalingRASopathiestranscript processing

Related Experiment Videos

  • This genetic event leads to a distinct phenotype including developmental delay, intellectual disability, autistic features, coarse facies, reduced growth, and ectodermal anomalies.
  • The altered protein function contributes to the observed clinical presentation.

    • Implications:

    • This study expands the understanding of genotype-phenotype correlations within the RASopathy spectrum.
    • It highlights a new mechanism of HRAS dysfunction contributing to developmental disorders.
    • The findings may inform future diagnostic and therapeutic strategies for patients with RASopathies.