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Aggrecan Mutations in Nonfamilial Short Stature and Short Stature Without Accelerated Skeletal Maturation. | LitMetric

AI Article Synopsis

Article Abstract

Aggrecan, a proteoglycan, is an important component of cartilage extracellular matrix, including that of the growth plate. Heterozygous mutations in , the gene encoding aggrecan, cause autosomal dominant short stature, accelerated skeletal maturation, and joint disease. The inheritance pattern and the presence of bone age equal to or greater than chronological age have been consistent features, serving as diagnostic clues. From family 1, a 6-year-old boy presented with short stature [height standard deviation score (SDS), -1.75] and bone age advanced by 3 years. There was no family history of short stature (height SDS: father, -0.76; mother, 0.7). Exome sequencing followed by Sanger sequencing identified a novel heterozygous frameshift mutation in (c.6404delC: p.A2135Dfs). From family 2, a 12-year-old boy was evaluated for short stature (height SDS, -3.9). His bone age at the time of genetic evaluation was approximately 1 year less than his chronological age. Family history was consistent with an autosomal dominant inheritance of short stature, with several affected members also showing early-onset osteoarthritis. Exome sequencing, confirmed by Sanger sequencing, identified a novel nonsense mutation in (c.4852C>T: p.Q1618X), which cosegregated with the phenotype. In conclusion, patients with mutations may present with nonfamilial short stature and with bone age less than chronological age. These findings expand the known phenotypic spectrum of heterozygous mutations and indicate that this diagnosis should be considered in children without a family history of short stature and in children without accelerated skeletal maturation.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5686699PMC
http://dx.doi.org/10.1210/js.2017-00229DOI Listing

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