Clinical and imaging hallmarks of the MYH7 ‐related myopathy with severe axial involvement

et al. 2020

Orphanet J Rare Dis

Background Laing distal myopathy is a rare autosomal dominant inherited distal myopathy caused by mutations of the MYH7 gene affecting mainly the rod region. We described the clinical features, muscle MRI and pathological changes as well as genetic mutations in a group of Chinese patients with Laing distal myopathy. Results Six patients with the confirmed diagnoses of Laing distal myopathy were recruited. Ankle dorsiflexion and finger extension weakness, as well as neck flexion weakness were common in our patients. Myopathic as well as neurogenic lesions were suggested by electromyography in different patients. Respiratory abnormality of sleep apnea was detected in two of our patients stressing the necessity of close respiratory monitoring in this disease. Muscle MRIs showed similar features of concentric fatty infiltration of anterior thigh muscles together with early involvement of tibialis anterior and extensor hallucis longus. However, muscle pathological presentations were varied depending on the biopsied muscles and the severity of the disease. In-frame deletions of the MYH7 gene made up 3/4 of mutations in our patients, suggesting that these are common mutations of Laing distal myopathy. Conclusions Our study further expanded the phenotypes and genotypes of Laing distal myopathy. In-frame deletions of the MYH7 gene are common causes of Laing distal myopathy.

Section: Discussionsupporting

confidence: 85%

Clinical features and genotypes of Laing distal myopathy in a group of Chinese patients, with in-frame deletions of MYH7 as common mutations

et al. 2020

Orphanet J Rare Dis

“…Meanwhile, weakness of nger extension is also very common. Axial muscles involvement is another feature of this disease, which is also seen in our patients that ve showed weakness of neck exion and two showed scoliosis [18,19]. Other orthopedic abnormalities including Achilles tendon contracture, winging scapula, and talipes cavus have also been reported in previous researches [5,20].…”

Section: Discussionsupporting

confidence: 85%

Clinical features and genotypes of Laing distal myopathy in a group of Chinese patients, with in-frame deletions of MYH7 as common mutations

et al. 2020

Preprint

Background: Laing distal myopathy is a rare autosomal dominant inherited distal myopathy caused by mutations of the MYH7 gene affecting mainly the rod region. We described the clinical features, muscle MRI and pathological changes as well as genetic mutations in a group of Chinese patients with Laing distal myopathy. Results: Six patients with the confirmed diagnoses of Laing distal myopathy were recruited. Ankle dorsiflexion and finger extension weakness, as well as neck flexion weakness were common in our patients. Myopathic as well as neurogenic lesions were suggested by electromyography in different patients. Respiratory abnormality of sleep apnea was detected in two of our patients stressing the necessity of close respiratory monitoring in this disease. Muscle MRIs showed similar features of concentric fatty infiltration of anterior thigh muscles together with early involvement of tibialis anterior and extensor hallucis longus. However, muscle pathological presentations were varied depending on the biopsied muscles and the severity of the disease. In-frame deletions of the MYH7 gene made up 3/4 of mutations in our patients, suggesting that these are common mutations of Laing distal myopathy. Conclusions: Our study further expanded the phenotypes and genotypes of Laing distal myopathy. In-frame deletions of the MYH7 gene are common causes of Laing distal myopathy.

“…Meanwhile, weakness of nger extension is also very common. Axial muscles involvement is another feature of this disease, which is also seen in our patients that ve showed weakness of neck exion and two showed scoliosis [17,18]. Other orthopedic abnormalities including Achilles tendon contracture, winging scapula, talipes cavus have also been reported in previous researches [5,19].…”

Section: Discussionsupporting

confidence: 85%

Clinical Features and Genotypes of Laing Distal Myopathy in a Group of Chinese Patients, With In-Frame Deletions of MYH7 as Common Mutations

et al. 2020

Preprint

Abstract Background: Laing distal myopathy is a rare autosomal dominant inherited distal myopathy caused by mutations of the MYH7 gene affecting mainly the rod region. We described the clinical features, muscle MRI and pathological changes as well as genetic mutations in a group of Chinese patients of Laing distal myopathy. Results: Six patients with the confirmed diagnoses of Laing distal myopathy were recruited. Ankle dorsiflexion and finger extension weakness were common in our patients as well as neck flexion weakness. Myopathic as well as neurogenic lesions were suggested by electromyography in different patients. Respiratory abnormality of sleep apnea was detected in two of our patients stressing the necessity of close respiratory monitoring in this disease. Muscle MRIs showed similar features of concentric fatty infiltration of anterior thigh muscles together with early involvement of tibialis anterior and extensor hallucis longus. However, muscle pathological presentations were varied depending on the biopsied muscles and severity of the disease. In-frame deletions of the MYH7 gene made up 3/4 of mutations in our patients, suggesting these are common mutations of Laing distal myopathy. Conclusions: Our study further expanded the phenotypes and genotypes of Laing distal myopathy. In-frame deletions of MYH7 gene are common causes of Laing distal myopathy.