Aggresome-autophagy involvement in a sarcopenic patient with rigid spine syndrome and a p.C150R mutation in FHL1 gene

Patrizia Sabatelli, Silvia Castagnaro, Francesca Tagliavini, Martina Chrisam, Francesca Sardone, Laurence Demay, Pascale Richard, Spartaco Santi, Nadir M. Maraldi, Luciano Merlini, Marco Sandri, Paolo Bonaldo

Research output: Contribution to journalArticle

Abstract

The four-and-half LIM domain protein 1 (FHL1) is highly expressed in skeletal and cardiac muscle. Mutations of the FHL1 gene have been associated with diverse chronic myopathies including reducing body myopathy, rigid spine syndrome (RSS), and Emery-Dreifuss muscular dystrophy. We investigated a family with a mutation (p.C150R) in the second LIM domain of FHL1. In this family, a brother and a sister were affected by RSS, and their mother had mild lower limbs weakness. The 34-year-old female had an early and progressive rigidity of the cervical spine and severe respiratory insufficiency. Muscle mass evaluated by DXA was markedly reduced, while fat mass was increased to 40%. CT scan showed an almost complete substitution of muscle by fibro-adipose tissue. Muscle biopsy showed accumulation of FHL1 throughout the cytoplasm and around myonuclei into multiprotein aggregates with aggresome/autophagy features as indicated by ubiquitin, p62, and LC3 labeling. DNA deposits, not associated with nuclear lamina components and histones, were also detected in the aggregates, suggesting nuclear degradation. Ultrastructural analysis showed the presence of dysmorphic nuclei, accumulation of tubulofilamentous and granular material, and perinuclear accumulation of autophagic vacuoles. These data point to involvement of the aggresome-autophagy pathway in the pathophysiological mechanism underlying the muscle pathology of FHL1 C150R mutation.

Original languageEnglish
Article numberArticle 215
JournalFrontiers in Aging Neuroscience
Volume6
Issue numberAUG
DOIs
Publication statusPublished - 2014

Keywords

  • autophagy
  • FHL1
  • Myopathy
  • protein aggregates
  • sarcopenia

ASJC Scopus subject areas

  • Ageing
  • Cognitive Neuroscience

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    Sabatelli, P., Castagnaro, S., Tagliavini, F., Chrisam, M., Sardone, F., Demay, L., Richard, P., Santi, S., Maraldi, N. M., Merlini, L., Sandri, M., & Bonaldo, P. (2014). Aggresome-autophagy involvement in a sarcopenic patient with rigid spine syndrome and a p.C150R mutation in FHL1 gene. Frontiers in Aging Neuroscience, 6(AUG), [Article 215]. https://doi.org/10.3389/fnagi.2014.00215