1. A NovelSHOC2Variant in Rasopathy
- Author
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Vickie L. Hannig, Emilia Galperin, Myoungkun Jeoung, John A. Phillips, and Eun Ryoung Jang
- Subjects
Scaffold protein ,MAP Kinase Signaling System ,Gene Expression ,RASopathy ,Biology ,medicine.disease_cause ,Article ,Germline mutation ,Mutant protein ,Genetics ,medicine ,Humans ,Missense mutation ,Abnormalities, Multiple ,Genetics (clinical) ,Mutation ,Kinase ,Intracellular Signaling Peptides and Proteins ,Facies ,Genetic Variation ,medicine.disease ,Phenotype ,Child, Preschool ,Female ,Protein Binding - Abstract
Rasopathies are a group of genetic disorders caused by germline mutations in multiple genes of the Extracellular signal-Regulated Kinases 1 and 2 (ERK1/2) pathway. The only previously identified missense mutation in SHOC2, a scaffold protein of the ERK1/2 pathway, led to Noonan-like syndrome with loose anagen hair. Here we report a novel mutation in SHOC2(c.519G>A; p.M173I) that leads to a Rasopathy with clinical features partially overlapping those occurring in Noonan and Cardio-Facio-Cutaneous syndromes. Studies to clarify the significance of this SHOC2 variant revealed that the mutant protein has impaired capacity to interact with protein phosphatase 1c (PP1c), leading to insufficient activation of RAF-1 kinase. This SHOC2 variant thus is unable to fully rescue ERK1/2 activity in cells depleted of endogenous SHOC2. We conclude that SHOC2 mutations can cause a spectrum of Rasopathy phenotypes in heterozygous individuals. Importantly, our work suggests that individuals with mild Rasopathy symptoms may be under-diagnosed.
- Published
- 2014