Expanding the importance of HMERF titinopathy: new mutations and clinical aspects - Sorbonne Université
Journal Articles Journal of Neurology Year : 2019

Expanding the importance of HMERF titinopathy: new mutations and clinical aspects

Andres Berardo
  • Function : Author
Ricardo Reisin
  • Function : Author
Shahram Attarian
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  • PersonId : 1042088
Andoni Urtizberea
  • Function : Author
Ana Maria Cobo
  • Function : Author
Sergei Kurbatov
  • Function : Author
Sergei Nikitin
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Monika Raimondi
  • Function : Author
Fernando Silveira
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  • PersonId : 980398

Abstract

OBJECTIVE: Hereditary myopathy with early respiratory failure (HMERF) is caused by titin A-band mutations in exon 344 and considered quite rare. Respiratory insufficiency is an early symptom. A collection of families and patients with muscle disease suggestive of HMERF was clinically and genetically studied.METHODS: Altogether 12 new families with 19 affected patients and diverse nationalities were studied. Most of the patients were investigated using targeted next-generation sequencing; Sanger sequencing was applied in some of the patients and available family members. Histological data and muscle MRI findings were evaluated.RESULTS:Three families had several family members studied while the rest were single patients. Most patients had distal and proximal muscle weakness together with respiratory insufficiency. Five heterozygous TTN A-band mutations were identified of which two were novel. Also with the novel mutations the muscle pathology and imaging findings were compatible with the previous reports of HMERF.CONCLUSIONS:Our collection of 12 new families expands mutational spectrum with two new mutations identified. HMERF is not that rare and can be found worldwide, but maybe underdiagnosed. Diagnostic process seems to be complex as this study shows with mostly single patients without clear dominant family history.
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Dates and versions

hal-02064991 , version 1 (12-03-2019)

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Johanna Palmio, Sarah Léonard-Louis, Sabrina Sacconi, Marco Savarese, Sini Penttilä, et al.. Expanding the importance of HMERF titinopathy: new mutations and clinical aspects. Journal of Neurology, 2019, 266 (3), pp.680-690. ⟨10.1007/s00415-019-09187-2⟩. ⟨hal-02064991⟩
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