X-Linked Myotubular Myopathy: A Novel Mutation Expanding the Genotypic Spectrum of a Phenotypically Heterogeneous Myopathy.

Abstract

X-linked myotubular myopathy (XLMTM), a centronuclear congenital myopathy secondary to pathogenic variants in the MTM1 gene encoding myotubularin, is typically recognized for its classic and severe phenotype which includes neonatal hypotonia, severe muscle weakness, long-term ventilator dependence, markedly delayed gross motor milestones with inability to independently ambulate, and a high neonatal and childhood mortality. However, milder congenital forms of the condition and other phenotypes are recognized. We describe a 6-year-old boy with a mild XLMTM phenotype with independent gait and no respiratory insufficiency even in the neonatal period. The child has a hemizygous novel splice site variant in the MTM1 gene (c.232-25A > T) whose pathogenicity was confirmed by cDNA studies (exon 5 skipping) and muscle biopsy findings. We also compared the phenotype of our patient with the few reported cases that presented a mild XLMTM phenotype and no respiratory distress at birth, and discussed the potential mechanisms underlying this phenotype such as the presence of residual expression of the normal myotubularin transcript.

• Authors: Andreia Carvalho, Carmen Costa, Miguel Pinto, Ricardo Taipa, Ana Gonçalves, Márcia E Oliveira, Sofia Ferreira, Joana Afonso Ribeiro
• Journal: Journal of pediatric genetics (J Pediatr Genet) Vol. 12 Issue 3 Pg. 258-262 (Sep 2023) ISSN: 2146-4596 [Print] Germany
• PMID: 37575650 (Publication Type: Journal Article)
• Copyright: Thieme. All rights reserved.