MECP2

Methyl-CpG-binding protein 2 (MECP2) is a protein that in humans is encoded by the MECP2 gene. MECP2 is critically involved in the regulation of gene expression and is essential for normal brain development. Mutations in the MECP2 gene are associated with several neurological disorders, most notably Rett syndrome, a progressive neurodevelopmental disorder that almost exclusively affects females.

Function

MECP2 is a member of the methyl-CpG-binding domain (MBD) family and binds to methylated DNA. It can silence gene expression through the recruitment of histone deacetylase, a process that modifies the chromatin structure, making it less accessible for transcription. MECP2 plays a vital role in neuronal maturation, synaptic plasticity, and brain function. It is highly expressed in neuronal cells, where it contributes to the fine-tuning of gene expression necessary for complex brain processes.

Genetic Mutations and Disorders

Mutations in the MECP2 gene are primarily associated with Rett syndrome, but they can also lead to a variety of other neurological conditions, including MECP2 duplication syndrome, severe neonatal encephalopathy, and some cases of autism spectrum disorder. The nature of the mutation can influence the severity and type of symptoms experienced.

Rett Syndrome

Rett syndrome is the most well-known condition linked to mutations in the MECP2 gene. It is characterized by normal early growth and development followed by a slowing of development, loss of purposeful use of the hands, distinctive hand movements, slowed brain and head growth, problems with walking, seizures, and intellectual disability.

MECP2 Duplication Syndrome

MECP2 duplication syndrome is caused by a duplication of the MECP2 gene and results in a constellation of symptoms including intellectual disability, motor dysfunction, seizures, and increased susceptibility to respiratory infections.

Diagnosis and Treatment

Diagnosis of disorders related to MECP2 mutations typically involves genetic testing to identify mutations in the MECP2 gene. Currently, there is no cure for conditions caused by MECP2 mutations, and treatment focuses on managing symptoms and improving quality of life. This may include physical therapy, occupational therapy, medication for seizures, and supportive care for respiratory issues.

Research Directions

Research on MECP2 is ongoing, with studies aimed at understanding the precise mechanisms by which MECP2 mutations lead to neurological disorders. There is also significant interest in developing gene therapy approaches to treat or even reverse conditions caused by MECP2 mutations.

See Also

• Genetic disorder
• Neurodevelopmental disorder
• Gene therapy