NRAS associated RASopathy and embryonal rhabdomyosarcoma

Area of Science:

• Genetics
• Developmental Biology
• Oncology

Background:

• RASopathies are developmental disorders caused by RAS/MAPK pathway dysregulation.
• Germline mutations in KRAS, HRAS, and NRAS genes lead to distinct RASopathy phenotypes.
• Somatic Ras gene mutations are frequent in cancers, while germline mutations cause developmental syndromes.

Observation:

• A patient presented with a severe phenotype including embryonal rhabdomyosarcoma, intellectual disability, and Noonan syndrome features.
• This severe phenotype was associated with a germline heterozygous NRAS mutation (p.G12R).
• This specific NRAS mutation is also a common somatic mutation found in cancer cells.

Findings:

• Germline NRAS mutations can cause severe developmental phenotypes, including embryonal rhabdomyosarcoma.
• The p.G12R NRAS mutation, common in cancers, was identified in this RASopathy case.
• Analysis suggests NRAS mutations at oncogenic codons correlate with increased cancer risk in RASopathy patients.

Implications:

• This case expands the understanding of NRAS-related RASopathies and their phenotypic spectrum.
• Identifying oncogenic NRAS mutations in developmental disorders may inform cancer surveillance strategies.
• Further research into genotype-phenotype correlations in NRAS-RASopathies is warranted.