A novel pathogenic MYH3 mutation in a child with Sheldon-Hall syndrome and vertebral fusions
| Autor: | Mohamad Maghnie, Andrea Accogli, Moneef Shoukier, Marcello Scala, Valeria Capra, Anna Allegri, Christoph Peter Bagowski, Elisa De Grandis |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Calcaneovalgus deformity Male Pathology medicine.medical_specialty 030105 genetics & heredity arthrogryposis embryonic myosin heavy chain SheldonâHall syndrome vertebral fusions Genetics Genetics (clinical) TPM2 03 medical and health sciences Camptodactyly Vertebral fusion medicine Humans Genetic Predisposition to Disease Child Genetic Association Studies Muscle contracture Arthrogryposis Comparative Genomic Hybridization business.industry Facies Spine Radiography Cytoskeletal Proteins 030104 developmental biology Phenotype Mutation Ulnar deviation TNNT3 medicine.symptom business Sheldonâ Hall syndrome |
| Zdroj: | American journal of medical genetics. Part A. 176(3) |
| ISSN: | 1552-4833 |
| Popis: | Sheldon-Hall syndrome (SHS) is the most common of the distal arthrogryposes (DAs), a group of disorders characterized by congenital non-progressive contractures. Patients with SHS present with contractures of the limbs and a distinctive triangular facies with prominent nasolabial folds. Calcaneovalgus deformity is frequent, as well as camptodactyly and ulnar deviation. Causative mutations in at least four different genes have been reported (MYH3, TNNI2, TPM2, and TNNT3). MYH3 plays a pivotal role in fetal muscle development and mutations in this gene are associated with Freeman-Sheldon syndrome, distal arthrogryposis 8 (DA8), and autosomal dominant spondylocarpotarsal synostosis. The last two disorders are characterized by skeletal abnormalities, in particular bony fusions. The observation that MYH3 may be mutated in these syndromes has suggested the involvement of this gene in bone development. We report the case of a boy with a novel pathogenic MYH3 mutation, presenting with the classical clinical features of SHS in association with unilateral carpal bone fusion and multiple vertebral fusions. This distinctive phenotype has never been reported in the literature so far and expands the phenotypic spectrum of SHS, endorsing the clinical variability of patients with MYH3-related disorders. Our findings also support a role for MYH3 in both muscle and bone development, suggesting a phenotypic continuum in MYH3-related disorders. |
| Databáze: | OpenAIRE |
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