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Updated: Sep 10, 2025
An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants
Published on: May 22, 2020
Mutation of MeCP2 at T158M Leads to Distinct Molecular and Phenotypic Abnormalities in Male and Female Mice
Chris-Tiann Roberts1, Ashraf Kadar Shahib1, Khatereh Saei Arezoumand1
1Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, 745 Bannatyne Avenue, Basic Medical Sciences Bldg. Room 627, Winnipeg, MB R3E 0J9, Canada.
Abstract:
Methyl CpG-binding protein 2 (MeCP2) is an epigenetic reader of DNA methylation with high abundance in the brain. While genetic mutations occur across different protein domains of MeCP2, the T158M mutation is amongst the most frequent MeCP2 mutations. MeCP2 is encoded by the MECP2/Mecp2 gene located on the X chromosome. In humans, MECP2 mutations cause Rett Syndrome, a debilitating neurodevelopmental disorder in females, with very rare cases presenting in males. Despite the generation of different transgenic mouse lines with MeCP2 mutations, the sex-dependent phenotypic and molecular impact of common MeCP2 mutations in mouse models of disease remains largely unexplored. Here, we focus on the MeCP2 T158M mutation using Mecp2tm4.1Bird/J transgenic mice (referred to as Mecp2T158M), and report that Mecp2T158M mutant mice display sex-specific molecular, behavioural, and phenotypic characteristics when compared to wild-type controls. Our data indicates sex- and brain-region-dependent impacts on the expression of MeCP2, synaptic proteins, cytoskeletal markers, and autophagy factors. Our findings demonstrate that the phenotypic and molecular characteristics of this mouse model may relate to the clinical manifestation in human patients with Rett Syndrome.
Insights
The Methyl CpG-binding protein 2 (MeCP2) T158M mutation impacts mouse models differently based on sex. This MeCP2 mutation affects molecular, behavioral, and phenotypic traits in a sex-specific manner.
Area of Science:
- Neuroscience
- Genetics
- Epigenetics
Background:
- Methyl CpG-binding protein 2 (MeCP2) is crucial for brain function and is encoded by the X-linked MECP2 gene.
- Mutations in MECP2 cause Rett Syndrome, a severe neurodevelopmental disorder primarily affecting females.
- The T158M mutation is a frequent MECP2 mutation, but its sex-specific impact in mouse models is understudied.
Purpose of the Study:
- To investigate the sex-dependent molecular, behavioral, and phenotypic effects of the MeCP2 T158M mutation in a mouse model.
- To explore how this common mutation influences gene expression, synaptic function, and cellular processes in a sex-specific manner.
Main Methods:
- Utilized Mecp2T158M transgenic mice to model the T158M mutation.
- Compared molecular, behavioral, and phenotypic characteristics of mutant mice to wild-type controls.
- Analyzed sex- and brain-region-specific expression of MeCP2, synaptic proteins, cytoskeletal markers, and autophagy factors.
Main Results:
- Mecp2T158M mutant mice exhibited distinct sex-specific molecular, behavioral, and phenotypic profiles compared to wild-type littermates.
- Observed sex- and brain-region-dependent alterations in the expression of key proteins, including MeCP2, synaptic markers, cytoskeletal components, and autophagy factors.
- The study identified significant sex-based differences in the molecular and phenotypic consequences of the T158M mutation.
Conclusions:
- The MeCP2 T158M mutation in mice leads to sex-specific molecular and phenotypic outcomes.
- These findings highlight the importance of considering sex as a biological variable in MeCP2-related research and disease modeling.
- The characterized mouse model provides valuable insights into the clinical manifestations of Rett Syndrome in human patients.
