Journal
NEUROMUSCULAR DISORDERS
Volume 19, Issue 3, Pages 193-195Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nmd.2008.11.013
Keywords
SMARD1 respiratory distress; Hypotonia; Muscle weakness; IUGR; Phenotype; IGHMBP2
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Spinal Muscular atrophy with respiratory distress (SMARD1: mu-binding protein 2 gene mutation) is characterised by low birth weight, progressive distal limb weakness, diaphragmatic paralysis and subsequent respiratory failure manifesting before 13 months of age. Our case report illustrates marked phenotype variability in two siblings with an identical genetic mutation of SMARD1, one of whom died of fulminant respiratory failure aged 6 months, whereas the other shows limb weakness but, only mild sleep hypoventilation aged 12 years. This suggests other compensatory mechanisms may play a role in modifying SMARD1; broadening our perception of phenotype. Therefore, SMARD1 phenotype should be considered in cases of atypical spinal muscular atrophy even in the absence of overt diaphragmatic weakness. (C) 2008 Elsevier B.V. All rights reserved.
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