Abstract:
:Mutations in the sarcomeric protein titin, encoded by TTN, are emerging as a common cause of myopathies. The diagnosis of a TTN-related myopathy is, however, often not straightforward due to clinico-pathological overlap with other myopathies and the prevalence of TTN variants in control populations. Here, we present a combined clinico-pathological, genetic and biophysical approach to the diagnosis of TTN-related myopathies and the pathogenicity ascertainment of TTN missense variants. We identified 30 patients with a primary TTN-related congenital myopathy (CM) and two truncating variants, or one truncating and one missense TTN variant, or homozygous for one TTN missense variant. We found that TTN-related myopathies show considerable overlap with other myopathies but are strongly suggested by a combination of certain clinico-pathological features. Presentation was typically at birth with the clinical course characterized by variable progression of weakness, contractures, scoliosis and respiratory symptoms but sparing of extraocular muscles. Cardiac involvement depended on the variant position. Our biophysical analyses demonstrated that missense mutations associated with CMs are strongly destabilizing and exert their effect when expressed on a truncating background or in homozygosity. We hypothesise that destabilizing TTN missense mutations phenocopy truncating variants and are a key pathogenic feature of recessive titinopathies that might be amenable to therapeutic intervention.
journal_name
Acta Neuropatholjournal_title
Acta neuropathologicaauthors
Rees M,Nikoopour R,Fukuzawa A,Kho AL,Fernandez-Garcia MA,Wraige E,Bodi I,Deshpande C,Özdemir Ö,Daimagüler HS,Pfuhl M,Holt M,Brandmeier B,Grover S,Fluss J,Longman C,Farrugia ME,Matthews E,Hanna M,Muntoni F,Sarkozydoi
10.1007/s00401-020-02257-0subject
Has Abstractpub_date
2021-01-15 00:00:00eissn
0001-6322issn
1432-0533pii
10.1007/s00401-020-02257-0pub_type
杂志文章abstract::The cerebrovascular lesions of severe chronic hypertension were studied by light microscopy in perfusion-fixed, subserially sectioned brains from stroke-prone spontaneously hypertensive rats (SHRSP). The leakage and spread of plasma proteins were visualized by immunohistochemical detection of extravasated fibrinogen a...
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