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MECP2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

MECP2 gene

The MECP2 gene provides instructions for the MeCP2 protein, which is vital for brain function and the regulation of gene expression.

Normal Function

The MECP2 gene provides instructions for making the MeCP2 protein. This protein helps regulate gene activity by modifying chromatin, the complex of DNA and protein that packages DNA into chromosomes. While present throughout the body, it is particularly abundant in brain cells.

In the brain, MeCP2 is important for the function of neurons and the maintenance of synapses, where cell-to-cell communication occurs. It is also believed to be involved in alternative splicing, a process that cuts and rearranges messenger RNA (mRNA) to produce different versions of proteins, which is critical for normal neuronal communication.

Health Conditions Related to Genetic Changes

Rett syndrome

More than 620 mutations in the MECP2 gene have been identified in females with Rett syndrome. These mutations alter the structure of the MeCP2 protein or reduce the amount produced, impairing gene regulation and disrupting alternative splicing in brain cells.

MECP2 duplication syndrome

An extra copy of the MECP2 gene causes MECP2 duplication syndrome. This leads to the production of excess MeCP2 protein, which disrupts normal brain activity and results in intellectual disability, delayed development, and seizures.

MECP2-related severe neonatal encephalopathy

At least 19 mutations in the MECP2 gene cause this condition, which almost exclusively affects males. It is characterized by microcephaly, movement disorders, breathing problems, and seizures due to a shortage of functional MeCP2 protein.

PPM-X syndrome

Mutations in the MECP2 gene cause PPM-X syndrome, characterized by intellectual disability, bipolar disorder, and parkinsonism. These mutations prevent the MeCP2 protein from properly interacting with DNA or other proteins.

Frequently Asked Questions

Currently, management is supportive—antiepileptic drugs for seizures, physical and speech therapy, and behavioral interventions. Clinical trials of IGF‑1, trofinetide, and gene‑silencing approaches are ongoing, but none are yet FDA‑approved as a cure.
Female carriers have a 50 % chance of passing the altered X chromosome to each child; sons who inherit the mutation are at high risk for severe neonatal encephalopathy, while daughters may develop Rett syndrome. Prenatal options include chorionic villus sampling or amniocentesis for targeted MECP2 testing, and pre‑implantation genetic diagnosis (PGD) can be used with IVF to select embryos without the mutation.
clinical exome or targeted MECP2 sequencing panel is typically ordered; the test looks for pathogenic variants in the MECP2 gene, and results are interpreted alongside clinical criteria such as loss of purposeful hand use and gait abnormalities.
Key early clues include hypotonia, feeding difficulties, recurrent respiratory infections, and the onset of seizures before age 2; if these appear with developmental delay, clinicians often order quantitative PCR or microarray to detect an extra copy of the MECP2 region.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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