What is Rett Syndrome

Rett syndrome is a rare, complex neurodevelopmental disorder that primarily affects girls, causing a progressive loss of motor, communication, and cognitive skills after a period of seemingly normal development. It is most frequently caused by a spontaneous genetic mutation in the MECP2 gene, which disrupts the normal development and function of the brain.

What exactly is Rett syndrome?

Rett syndrome is a unique condition that typically presents in early childhood. Unlike many other developmental disorders present from birth, children with Rett syndrome usually reach their early developmental milestones normally before experiencing a period of regression. This regression often involves the loss of purposeful hand movements, which are frequently replaced by repetitive hand-wringing, washing, or clapping motions. As a neurological condition, it impacts nearly every system in the body, leading to difficulties with movement, breathing, digestion, and sleep.

Who is affected by Rett syndrome?

Rett syndrome is estimated to occur in approximately 1 in 10,000 to 1 in 15,000 female births worldwide. While it has been identified in all ethnic groups and geographic locations, it is almost exclusively diagnosed in females. This is because the MECP2 gene is located on the X chromosome; in males, who typically have only one X chromosome, the mutation is usually lethal before or shortly after birth. In our DiseaseMaps community, we have 416 people with Rett syndrome who have connected to share their experiences and navigate the challenges of this rare diagnosis together.

What causes Rett syndrome and how does it manifest?

The pathophysiology of Rett syndrome centers on the MECP2 gene, which provides instructions for making a protein essential for normal brain function. When this gene is mutated, the protein is either absent or non-functional, causing nerve cells to struggle to communicate effectively. Clinical symptoms vary, but common manifestations include:

• Loss of purposeful hand skills: Replacing intentional movements with stereotypic motions.


• Communication deficits: Significant loss or impairment of language and social interaction skills.


• Motor impairments: Challenges with gait, balance, and muscle tone (often leading to scoliosis).


• Autonomic dysfunction: Irregular breathing patterns, such as hyperventilation or breath-holding, and sleep disturbances.


• Seizures: Approximately 60-80% of individuals with Rett syndrome experience epilepsy at some point in their lives.

How is Rett syndrome differentiated from other conditions?

Distinguishing Rett syndrome from other conditions like Autism Spectrum Disorder (ASD) or cerebral palsy is critical. While ASD involves social communication challenges, Rett syndrome is characterized by the specific, distinct "regression" phase and the presence of stereotypical hand movements. Genetic testing is the gold standard for confirmation, as identifying a pathogenic variant in the MECP2 gene provides a definitive diagnosis. It is important to note that while clinical variants exist (such as the preserved speech variant), the core presentation remains distinct from other neurogenetic disorders.

Next steps

• Consult a specialist: Seek evaluation from a pediatric neurologist or a geneticist familiar with Rett syndrome to confirm the diagnosis and establish a management plan.


• Join a community: Connect with others at DiseaseMaps.org to share resources and learn from the 416 members who understand the daily realities of life with this condition.


• Explore clinical trials: Visit ClinicalTrials.gov to stay informed about the latest research and emerging therapies aimed at addressing the underlying mechanisms of the syndrome.


• Multidisciplinary care: Work with a team including physical therapists, occupational therapists, and speech-language pathologists to maximize quality of life.

Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always consult with a qualified healthcare professional regarding any medical condition.

References

• National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD): Rett Syndrome Overview.


• Orphanet: Rare Disease Database (ORPHA:771).


• Online Mendelian Inheritance in Man (OMIM): Entry #312750 (Rett Syndrome).


• International Rett Syndrome Foundation (IRSF): Clinical and Research Resources.