scholarly journals Rett syndrome: Methyl-CpG binding protein 2 transformation and phenotypic-genotypic characteristics

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Asma Saeed
Keyword(s):  
Rett Syndrome ◽  
Binding Protein ◽  
Genotypic Characteristics

Methyl-CpG-binding protein 2 (MECP2) mutation type is associated with bone disease severity in Rett syndrome

2019 ◽  
Author(s):  
Carla Caffarelli ◽  
Tomai Pitinca Maria Dea ◽  
Valentina Francolini ◽  
Roberto Canitano ◽  
felice Claudio De ◽  
...  
Keyword(s):  
Disease Severity ◽  
Rett Syndrome ◽  
Bone Disease ◽  
Binding Protein ◽  
Mecp2 Mutation ◽  
Mutation Type

scholarly journals Methyl-CpG-binding protein 2(MECP2) mutation type is associated with disease severity in Rett syndrome

2014 ◽  
Vol 51 (3) ◽  
pp. 152-158 ◽  
Author(s):  
Vishnu Anand Cuddapah ◽  
Rajesh B Pillai ◽  
Kiran V Shekar ◽  
Jane B Lane ◽  
Kathleen J Motil ◽  
...  
Keyword(s):  
Disease Severity ◽  
Rett Syndrome ◽  
Binding Protein ◽  
Mecp2 Mutation ◽  
Mutation Type

scholarly journals Ten novel insertion/deletion variants in MECP2 identified in Japanese patients with Rett syndrome

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Eri Takeshita ◽  
Aritoshi Iida ◽  
Chihiro Abe-Hatano ◽  
Eiji Nakagawa ◽  
Masayuki Sasaki ◽  
...  
Keyword(s):  
Rett Syndrome ◽  
Neurological Disorder ◽  
Binding Protein ◽  
Japanese Patients ◽  
Gene Encoding ◽  
Pathogenic Variants

Abstract Rett syndrome (RTT) is an X-linked progressive and severe neurological disorder caused by mutations in the gene encoding methyl CpG binding protein 2 (MECP2). Among the 49 typical RTT patients examined, we identified 10 novel and eight known insertion/deletion variants, and 31 known pathogenic variants in MECP2. The pathogenic variants presented here should be a useful resource for examining the correlation between the genotypes and phenotypes of RTT.

scholarly journals A selective 5-HT1a receptor agonist improves respiration in a mouse model of Rett syndrome

2013 ◽  
Vol 115 (11) ◽  
pp. 1626-1633 ◽  
Author(s):  
Erica S. Levitt ◽  
Barbara J. Hunnicutt ◽  
Sharon J. Knopp ◽  
John T. Williams ◽  
John M. Bissonnette
Keyword(s):  
Rett Syndrome ◽  
Binding Protein ◽  
Glutamate Release ◽  
Outward Current ◽  
Cell Voltage ◽  
Equilibrium Potential ◽  
Maximal Effect ◽  
Dependent Manner ◽  
Male Mice ◽  
Loss Of Function

Rett syndrome is a neurological disorder caused by loss of function mutations in the gene that encodes the DNA binding protein methyl-CpG-binding protein 2 (Mecp2). A prominent feature of the syndrome is disturbances in respiration characterized by frequent apnea and an irregular interbreath cycle. 8-Hydroxy-2-dipropylaminotetralin has been shown to positively modulate these disturbances (Abdala AP, Dutschmann M, Bissonnette JM, Paton JF, Proc Natl Acad Sci U S A 107: 18208–18213, 2010), but the mode of action is not understood. Here we show that the selective 5-HT1a biased agonist 3-chloro-4-fluorophenyl-(4-fluoro-4-{[(5-methylpyrimidin-2-ylmethyl)-amino]-methyl}-piperidin-1-yl)-methanone (F15599) decreases apnea and corrects irregularity in both heterozygous Mecp2-deficient female and in Mecp2 null male mice. In whole cell voltage-clamp recordings from dorsal raphe neurons, F15599 potently induced an outward current, which was blocked by barium, reversed at the potassium equilibrium potential, and was antagonized by the 5-HT1a antagonist WAY100135. This is consistent with somatodendritic 5-HT1a receptor-mediated activation of G protein-coupled inwardly rectifying potassium channels (GIRK). In contrast, F15599 did not activate 5-HT1b/d receptors that mediate inhibition of glutamate release from terminals in the nucleus accumbens by a presynaptic mechanism. Thus F15599 activated somatodendritic 5-HT1a autoreceptors, but not axonal 5-HT1b/d receptors. In unanesthetized Mecp2-deficient heterozygous female mice, F15599 reduced apnea in a dose-dependent manner with maximal effect of 74.5 ± 6.9% at 0.1 mg/kg and improved breath irrregularity. Similarly, in Mecp2 null male mice, apnea was reduced by 62 ± 6.6% at 0.25 mg/kg, and breathing became regular. The results indicate respiration is improved with a 5-HT1a agonist that activates GIRK channels without affecting neurotransmitter release.

scholarly journals Rett syndrome mutation MeCP2 T158A disrupts DNA binding, protein stability and ERP responses

2011 ◽  
Vol 15 (2) ◽  
pp. 274-283 ◽  
Author(s):  
Darren Goffin ◽  
Megan Allen ◽  
Le Zhang ◽  
Maria Amorim ◽  
I-Ting Judy Wang ◽  
...  
Keyword(s):  
Dna Binding ◽  
Protein Stability ◽  
Rett Syndrome ◽  
Binding Protein ◽  
Dna Binding Protein

scholarly journals Suppressor mutations in Mecp2-null mice reveal that the DNA damage response is key to Rett syndrome pathology

2019 ◽  
Author(s):  
Adebola Enikanolaiye ◽  
Julie Ruston ◽  
Rong Zeng ◽  
Christine Taylor ◽  
Marijke Shrock ◽  
...  
Keyword(s):  
Dna Damage ◽  
Candidate Genes ◽  
Rett Syndrome ◽  
Association Analysis ◽  
Dna Damage Response ◽  
Binding Protein ◽  
Symptom Improvement ◽  
Suppressor Mutations ◽  
Entry Points ◽  
Damage Response

AbstractMutations in X-linked methyl-CpG-binding protein 2 (MECP2) cause Rett syndrome (RTT). We carried out a genetic screen for secondary mutations that improved phenotypes in Mecp2/Y mice after mutagenesis with N-ethyl-N-nitrosourea (ENU), aiming to identify potential therapeutic entry points. Here we report the isolation of 106 founder animals that show suppression of Mecp2-null traits from screening 3,177 Mecp2/Y genomes. Using exome sequencing, genetic crosses and association analysis, we identify 33 candidate genes in 30 of the suppressor lines. A network analysis shows that 61% of the candidate genes cluster into the functional categories of transcriptional repression, chromatin modification or DNA repair, delineating a pathway relationship with MECP2. Many mutations lie in genes that are predicted to modulate synaptic signaling or lipid homeostasis. Surprisingly, mutations in genes that function in the DNA damage response (DDR) also improve symptoms in Mecp2/Y mice. The combinatorial effects of multiple loci can be resolved by employing association analysis. One line, which was previously reported to carry a suppressor mutation in a gene required for cholesterol synthesis, Sqle, carries a second mutation in retinoblastoma binding protein 8 (Rbbp8 or CtIP), which regulates a DDR choice in double stranded break (DSB) repair. Cells from Mecp2/Y mice have increased DSBs, so this finding suggests that the balance between homology directed repair and non-homologous end joining is important for neuronal cells. In this and other lines, the presence of two suppressor mutations confers better symptom improvement than one locus alone, suggesting that combination therapies could be effective in RTT.

scholarly journals Persistent Unresolved Inflammation in the Mecp2-308 Female Mutated Mouse Model of Rett Syndrome

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Alessio Cortelazzo ◽  
Claudio De Felice ◽  
Bianca De Filippis ◽  
Laura Ricceri ◽  
Giovanni Laviola ◽  
...  
Keyword(s):  
Mouse Model ◽  
Rett Syndrome ◽  
Binding Protein ◽  
Neurodevelopmental Disorder ◽  
Unknown Origin ◽  
Apolipoprotein A1 ◽  
Inflammatory Status ◽  
Truncating Mutation ◽  
Alpha 1 Antitrypsin ◽  
First Time

Rett syndrome (RTT) is a rare neurodevelopmental disorder usually caused by mutations in the X-linked gene methyl-CpG-binding protein 2 (MECP2). Several Mecp2 mutant mouse lines have been developed recapitulating part of the clinical features. In particular, Mecp2-308 female heterozygous mice, bearing a truncating mutation, are a validated model of the disease. While recent data suggest a role for inflammation in RTT, little information on the inflammatory status in murine models of the disease is available. Here, we investigated the inflammatory status by proteomic 2-DE/MALDI-ToF/ToF analyses in symptomatic Mecp2-308 female mice. Ten differentially expressed proteins were evidenced in the Mecp2-308 mutated plasma proteome. In particular, 5 positive acute-phase response (APR) proteins increased (i.e., kininogen-1, alpha-fetoprotein, mannose-binding protein C, alpha-1-antitrypsin, and alpha-2-macroglobulin), and 3 negative APR reactants were decreased (i.e., serotransferrin, albumin, and apolipoprotein A1). CD5 antigen-like and vitamin D-binding protein, two proteins strictly related to inflammation, were also changed. These results indicate for the first time a persistent unresolved inflammation of unknown origin in the Mecp2-308 mouse model.

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