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Expression of several MTMR2 (zeige MTMR2 Proteine) isoforms ameliorates the myopathic phenotype owing to MTM1 loss, with increased muscle force, reduced myofiber atrophy, and reduction of the intracellular disorganization hallmarks associated with myotubular myopathy.
level of myotubes MTM1 mutations do not dramatically affect calcium homeostasis and calcium release mediated through the ryanodine receptor 1 (zeige RYR1 Proteine), though they do affect myotube size and nuclear content..mature muscles such as those obtained from patient muscle biopsies exhibit a significant decrease in expression of the ryanodine receptor 1 (zeige RYR1 Proteine), a decrease in muscle-specific (zeige EIF3K Proteine) microRNAs and a considerable up-regulation of HDAC4 (zeige HDAC4 Proteine).
In platelets, MTM1 is a highly active 3-phosphatase mainly associated to membranes and found on the dense granules and to a lesser (zeige F2 Proteine)extent on alpha-granules.
Results confirm that the severe neonatal onset of myopathy in male infants is sufficient to address the direct molecular testing toward the MTM1 gene and, above all, suggest that the number of undiagnosed symptomatic female carriers is probably underestimated
This study demonistrated that MTM1 mutation releated to Centronuclear myopathy.
mutations in SPEG (zeige SPEG Proteine) cause a centronuclear myopathy phenotype as a result of its interaction with MTM1.
Mutations in specific myotubularins such as MTM1 result in myotubular myopathy and Charcot-Marie-Tooth peripheral neuropathy. (Review)
Large duplications in MTM1 may account for a number of Centronuclear myopathy cases that have remained genetically unresolved.
Analysis of human XLMTM patient myotubes showed that mutations that disrupt the interaction between myotubularin and MTMR12 (zeige MTMR12 Proteine) proteins result in reduction of both myotubularin and MTMR12 (zeige MTMR12 Proteine)
data explain the basis for phenotypic variability among human patients with MTM1 p.R69C mutations and establish the Mtm1 p.R69C mouse as a valuable model for the disease, as its less severe phenotype will expand the scope of testable preclinical therapies
deletion of MTM1 in mouse had no significant effect on platelet count and on platelet secretion and aggregation induced by thrombin (zeige F2 Proteine) or collagen stimulation.
Differential muscle hypertrophy is associated with satellite cell numbers and Akt (zeige AKT1 Proteine) pathway activation following activin type IIB receptor (zeige ACVR2B Proteine) inhibition in Mtm1
MTM1 interacts with BIN1 (zeige BIN1 Proteine) in skeletal muscle.
Data show that the IGF1R (zeige IGF1R Proteine)/Akt (zeige AKT1 Proteine) pathway is affected in phosphoinositide phosphatase myotubularin (MTM1)-deficient muscles.
Deletion of the Mtm1 gene in a mature muscle reproduces the pathological hallmarks of myotubular myopathy.
study reveal a direct function of MTM1 enzymatic activity in SR remodeling and a key role for PtdIns3P in promoting SR membrane curvature in skeletal muscle.
aberrant mTORC1 signaling and impaired autophagy are consequences of the loss of Mtm1
Phosphatase-dead myotubularin ameliorates X-linked centronuclear myopathy phenotypes in mice.
These studies demonstrate specific abnormalities in myogenic cell number and behavior that may relate to the progression of disease in myotubularin deficiency.
This gene encodes a dual-specificity phosphatase that acts on both phosphotyrosine and phosphoserine. It is required for muscle cell differentiation and mutations in this gene have been identified as being responsible for X-linked myotubular myopathy.
, X-linked myotubular myopathy gene 1