A TPM2 mutation causes congenital myopathy with fibre-type disproportion.

We report a 9-year-old girl with delayed motor milestones and respiratory difficulty since birth. She presented as a floppy infant, with generalised muscle wasting, dysphagia and facial weakness. The muscle biopsy of the biceps brachii revealed congenital fibre-type disproportion (CFTD) and Sanger sequencing detected a pathogenic variant in the beta-tropomyosin (TPM2) gene (c.

Cross-correlation image analysis for real-time single particle tracking.

Accurately measuring the translations of objects between images is essential in many fields, including biology, medicine, chemistry, and physics. One important application is tracking one or more particles by measuring their apparent displacements in a series of images. Popular methods, such as the center of mass, often require idealized scenarios to reach the shot noise limit of particle tracking and, therefore, are not generally applicable to multiple image types.

Myopathy due to carnitine palmitoyltransferase II deficiency: updating genetic aspects of the first publication in Brazil.

Carnitine palmitoyltransferase II (CPT II) deficiency is an autosomal recessive inherited disorder related to lipid metabolism affecting skeletal muscle. The first cases of CPT II deficiency causing myopathy were reported in 1973. In 1983, Werneck et al published the first two Brazilian patients with myopathy due to CPT II deficiency, where the biochemical analysis confirmed deficient CPT activity in the muscle of both cases.

Triple-seronegative myasthenia gravis: clinical and epidemiological characteristics.

Background:   (MG) is an autoimmune disease usually caused by antibodies against the acetylcholine receptor (AChR-Abs), muscle-specific tyrosine kinase (MuSK-Abs), or low-density lipoprotein receptor-related protein 4 (LRP4-Abs). However, there are MG patients who do not have these antibodies and are thus said to have triple-seronegative (triple-SN) MG.

Objective:  This study aims to describe the frequency and clinical and epidemiological characteristics of patients with triple-SN MG.

Single-centre experience with autosomal recessive limb-girdle muscular dystrophy: case series and literature review.

Limb-girdle muscular dystrophy (LGMD) is a group of myopathies that lead to progressive muscle weakness, predominantly involving the shoulder and pelvic girdles; it has a heterogeneous genetic etiology, with variation in the prevalence of subtypes according to the ethnic backgrounds and geographic origins of the populations. The aim of the present study was to analyze a series of patients with autosomal recessive LGMD (LGMD-R) to contribute to a better characterization of the disease and to find the relative proportion of the different subtypes in a Southern Brazil cohort. The sample population consisted of 36 patients with LGMD-R.