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Fragile Bones Secondary to SMURF1 Gene Duplication

Abstract

Studies on mice have shown that the Smad Ubiquitin Regulatory Factor-1 (SMURF1) gene negatively regulates osteoblast function and the response to bone morphogenetic protein in a dose-dependent fashion (Chan et al. in Mol Cell Biol 27(16):5776–5789, https://doi.org/10.1128/MCB.00218-07, 2007; Yamashita et al. in Cell 121(1):101–113, https://doi.org/10.1016/j.cell.2005.01.035, 2005). In addition, a tumorigenic role for SMURF1 has been implicated due to the interference with apoptosis signals (Nie et al. in J Biol Chem 285(30):22818–22830, https://doi.org/10.1074/jbc.M110.126920, 2010; Wang et al. in Nat Commun 5:4901, https://doi.org/10.1038/ncomms5901, 2014). A 10-year-old girl with a history of severe developmental delay, infantile seizures, and B-cell lymphoma, in remission for approximately 3.5 years, was referred to the metabolic bone clinic for fractures and low bone mineral density. Array comparative genomic hybridization revealed a pathogenic microduplication in chromosome 7 at bands 7q21.3q22.1 that encompasses the SMURF1 gene. The clinical features of this child are congruous with the phenotype as ascribed excess Smurf1 mutations in mice. This is the first case description of osteoporosis in a child secondary to a microduplication involving SMURF1 gene.

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Author information

RAR is the guarantor. She and Dr. KMC were responsible for the care of patient and composition of the manuscript. Dr. FM conducted the genetic analysis on this patient. Dr. AAB was responsible for genetics follow-up of this patient. All authors revised the paper critically for intellectual content and approved the final version. All authors agree to be accountable for the work and to ensure that any questions relating to the accuracy and integrity of the paper are investigated and properly resolved.

Correspondence to Rawan Al-Rawi.

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Al-Rawi, R., Al-Beshri, A., Mikhail, F.M. et al. Fragile Bones Secondary to SMURF1 Gene Duplication. Calcif Tissue Int (2020). https://doi.org/10.1007/s00223-020-00668-5

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Keywords

  • SMURF1
  • Dosage-sensitive gene
  • Osteoporosis
  • Lymphoma