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  • Title: Autosomal dominant brachyolmia in a large Swedish family: phenotypic spectrum and natural course.
    Author: Grigelioniene G, Geiberger S, Horemuzova E, Moström E, Jäntti N, Neumeyer L, Åström E, Nordenskjöld M, Nordgren A, Mäkitie O.
    Journal: Am J Med Genet A; 2014 Jul; 164A(7):1635-41. PubMed ID: 24677493.
    Abstract:
    Autosomal dominant brachyolmia (Type 3, OMIM #113500) belongs to a group of skeletal dysplasias caused by mutations in the transient receptor potential cation channel, subfamily V, member 4 (TRPV4) gene, encoding a Ca++-permeable, non-selective cation channel. The disorder is characterized by disproportionate short stature with short trunk, scoliosis and platyspondyly. The phenotypic variability and long-term natural course remain inadequately characterized. The purpose of this study was to describe a large Swedish family with brachyolmia type 3 due to a heterozygous TRPV4 mutation c.1847G>A (p.R616Q) in 11 individuals. The mutation has previously been detected in another family with autosomal dominant brachyolmia [Rock et al., 2008]. Review of hospital records and patient assessments indicated that clinical symptoms of brachyolmia became evident by school age with chronic pain in the spine and hips; radiographic changes were evident earlier. Growth was not affected during early childhood but deteriorated with age in some patients due to increasing spinal involvement. Affected individuals had a wide range of subjective symptoms with chronic pain in the extremities and the spine, and paresthesias. Our findings indicate that autosomal dominant brachyolmia may be associated with significant long-term morbidity, as seen in this family.
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