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Clinical, pathological, and molecular genetic analysis of 7 Chinese patients with hereditary myopathy with early respiratory failure
- Source :
- Neurological Sciences. 43:3371-3380
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Hereditary myopathy with early respiratory failure (HMERF) is a subtype of myofibrillar myopathy. Mutations located on exon 344 of the titin-A band, the 119th fibronectin-3 domain (FN3 119), are responsible for HMERF. In this article, we retrospectively analyzed the clinical features, findings of muscle imaging, muscle pathology, immunohistochemistry, and ultrastructural characteristics of seven patients diagnosed with HMERF at a single center in China. Muscle MRI showed the involvement of semitendinosus in four patients. The common pathological features were variability in fiber diameter, increased internal nuclei, endomysial fibrosis, and cytoplasmic bodies. On immunohistochemical examination, the cytoplasmic bodies stained positive for calpain-3, p53, and programmed death-ligand 1. Electron microscopy showed cytoplasmic bodies, distorted sarcomere architecture, glycogen pool, and subsarcolemmal accumulation of mitochondria and lysosomes. We retrospectively reviewed four reported HMERF patients in China. Among the 11 patients, the median age at onset was 34 years (range 14–54). Allelic frequency of mutation c.95195C > T was 36.36%. This study characterizes the phenotype and genotype spectrum of HMERF in China.
- Subjects :
- Pathology
medicine.medical_specialty
Dermatology
Sarcomere
Exon
Muscular Diseases
Genotype
medicine
Humans
Muscle, Skeletal
Myopathy
Molecular Biology
Pathological
Allele frequency
Retrospective Studies
biology
business.industry
Genetic Diseases, Inborn
General Medicine
Psychiatry and Mental health
Mutation
biology.protein
Immunohistochemistry
Titin
Neurology (clinical)
medicine.symptom
Respiratory Insufficiency
business
Subjects
Details
- ISSN :
- 15903478 and 15901874
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Neurological Sciences
- Accession number :
- edsair.doi.dedup.....b96a495b50da85ca3a1d116ab27bb14e