Rett Syndrome

What is Rett syndrome?

Rett syndrome is a rare genetic neurodevelopmental disorder, meaning a condition that affects how the brain grows and develops from early life. It almost always affects girls. A child with Rett syndrome usually appears to develop normally for the first six to eighteen months of life and then loses skills she had already gained, such as purposeful hand use, babbling or early words, and the ability to move around easily. This loss of skills is called regression.

Rett syndrome is not a disease that gets caught or passed on through contact, and it is not caused by anything a parent did during pregnancy or infancy. In most cases it results from a spontaneous change in a single gene. Although the condition is lifelong and there is currently no cure, many of its symptoms can be managed, and supportive care can make a meaningful difference to comfort, communication, and quality of life.

Because Rett syndrome is often first recognized during infancy or toddlerhood, it is usually cared for by a team that includes pediatric neurologists (doctors who specialize in the nervous system in children), medical geneticists, and rehabilitation therapists. At Acibadem, genetic evaluation for suspected Rett syndrome is coordinated through the Medical Genetics Department, working alongside pediatric neurology.

Rett syndrome symptoms

Rett syndrome symptoms vary widely from one child to another, and they change over time. Doctors often describe the condition in four stages, although the boundaries between stages are not always clear and not every child follows the same pattern.

Common Rett syndrome symptoms include:

• Loss of purposeful hand skills, such as no longer being able to grasp toys, point, or feed herself.
• Repetitive hand movements, often described as hand wringing, hand washing, clapping, tapping, or bringing the hands to the mouth. These are called stereotypies, meaning repeated movements that do not have a clear purpose.
• Loss of spoken language, including words the child had previously used.
• Slowed head growth after the first months of life, sometimes leading to a smaller than expected head size (microcephaly).
• Problems with walking, such as a wide-based, unsteady, or stiff gait, or never learning to walk at all.
• Breathing irregularities while awake, including rapid breathing (hyperventilation), breath-holding, or swallowing air.
• Seizures, which are episodes of abnormal electrical activity in the brain and which affect many children with Rett syndrome.
• Sleep disturbances, such as waking at night, laughing or crying spells during the night, or daytime sleepiness.
• Curvature of the spine (scoliosis), which often develops during childhood or adolescence.
• Digestive problems, including constipation, reflux, and difficulty chewing or swallowing.
• Small, cold hands and feet, teeth grinding, and irritability or screaming episodes, especially in the early stages.

Stage 1 (early onset) usually begins between about six and eighteen months. Changes are subtle: the baby may seem less interested in toys or people, may be slower to sit or crawl, and head growth may begin to slow. Because the signs are mild, this stage is often overlooked or attributed to other causes.

Stage 2 (rapid regression) typically starts between about one and four years of age. Over weeks or months, the child loses purposeful hand use and spoken words, hand stereotypies appear, and breathing irregularities and social withdrawal may become noticeable. Some families describe this period as resembling autism, and Rett syndrome was once classified alongside autism spectrum disorders.

Stage 3 (plateau) can last for many years. Regression slows or stops, and some children become more alert, interested in their surroundings, and better at communicating with their eyes. Seizures and motor problems may be more prominent during this stage. Many girls remain in this stage for most of their lives.

Stage 4 (late motor deterioration) may begin in later childhood or adulthood. Mobility tends to decline, muscles may become stiff or weak, and scoliosis may worsen. Thinking, communication, and hand skills usually do not decline further at this stage, and repetitive hand movements may lessen.

Some children have milder or atypical (unusual) forms of Rett syndrome, in which speech is partly preserved, symptoms appear earlier or later than usual, or seizures are the first sign. Boys are rarely affected, and when they are, the condition often looks different and can be more severe.

Causes and risk factors

The main Rett syndrome cause is a change (mutation) in a gene called MECP2, which is located on the X chromosome. Genes are instructions that cells use to build proteins, and chromosomes are the structures that carry genes. The MECP2 gene provides instructions for a protein that helps control the activity of many other genes in the brain. When MECP2 does not work properly, the brain’s nerve cells do not mature and communicate as they should.

In the great majority of cases, the MECP2 mutation is de novo, which means it arises spontaneously in the egg or sperm cell or very early in development and is not inherited from either parent. For this reason, most families have no history of the condition, and the chance of having a second child with Rett syndrome is generally very low, although a genetic specialist is the right person to discuss this for an individual family.

The X chromosome explains why Rett syndrome affects girls far more often than boys. Girls have two X chromosomes, so cells with the healthy copy of MECP2 can partly compensate for cells with the changed copy. Boys have only one X chromosome, so a MECP2 mutation affects every cell; this is often not compatible with survival beyond infancy, or it produces a different and often more severe pattern of symptoms.

A small number of children with a Rett-like picture have changes in other genes, such as CDKL5 or FOXG1. Doctors now usually consider these separate but related disorders.

Known risk factors are few:

• Being female is the strongest association, simply because of how the gene is carried.
• A family history is rare, but in a very small number of families a parent may carry a MECP2 change without symptoms, which can increase the chance in siblings.

There is no evidence that diet, vaccines, infections, birth complications, or parenting practices cause Rett syndrome.

Rett syndrome diagnosis

Rett syndrome diagnosis is primarily clinical, meaning it rests on a careful history and physical examination against established diagnostic criteria, with genetic testing used to confirm or support the findings. Because early signs are subtle and overlap with other conditions, the diagnosis is often made after the regression period has begun.

The steps doctors typically follow include:

• Developmental history. The doctor asks in detail about the child’s early milestones, when skills were gained, and when and how they were lost. Videos taken by the family can be helpful in showing hand movements or breathing patterns.
• Physical and neurological examination. This includes measuring head growth over time, observing hand movements, gait, muscle tone, breathing patterns, and social interaction.
• Clinical diagnostic criteria. For typical Rett syndrome, doctors look for a period of regression followed by recovery or stabilization, together with the main features: partial or complete loss of purposeful hand skills, partial or complete loss of spoken language, walking problems, and repetitive hand stereotypies. Additional supportive features, such as breathing irregularities, scoliosis, sleep disturbance, and small cold hands and feet, strengthen the diagnosis. Atypical Rett syndrome is diagnosed when only some of the main criteria are met alongside a number of supportive features.
• Genetic testing. A blood sample is analyzed for changes in the MECP2 gene. A positive result supports the diagnosis, but a negative result does not completely rule it out, because a small proportion of children who meet the clinical criteria do not have a detectable MECP2 change. If MECP2 testing is negative, the doctor may test other genes or use a broader gene panel.
• Electroencephalogram (EEG). This test records the brain’s electrical activity using small sensors on the scalp and is used to evaluate seizures or unusual episodes.
• Electrocardiogram (ECG). A heart rhythm tracing is often done because some people with Rett syndrome have a heart rhythm abnormality called a prolonged QT interval, which may need monitoring.
• Other tests as needed. Brain imaging such as MRI (magnetic resonance imaging, a detailed scan that uses magnets rather than radiation) is not required for diagnosis but may be used to exclude other causes of regression. Metabolic blood and urine tests may be ordered for the same reason.

Genetic counseling is usually offered to families once a diagnosis is made. A genetic counselor explains what the result means, discusses testing for parents if appropriate, and answers questions about future pregnancies.

Rett syndrome treatment options

There is currently no cure for Rett syndrome, and no treatment can reverse the underlying genetic change. Rett syndrome treatment therefore focuses on managing symptoms, preventing complications, and helping each child reach her best possible level of comfort, communication, and independence. Care is usually lifelong and involves a team of specialists.

Medications. Your child’s doctor may prescribe medicines for specific symptoms:

• Antiseizure medications to control seizures; the choice depends on seizure type and how the child responds.
• Medicines for sleep problems, such as melatonin, in some cases.
• Treatments for constipation, reflux, and other digestive symptoms.
• Medicines to reduce drooling, muscle stiffness, or anxiety and agitation when these affect daily life.
• A disease-specific medication called trofinetide has been approved in some countries for Rett syndrome in children and adults. It does not cure the condition, and its benefits and side effects vary between individuals; whether it is appropriate and available is a discussion for the treating specialist.

Physical therapy. Regular physical therapy aims to maintain mobility, improve balance, prevent joint stiffness (contractures), and support walking for as long as possible. Standing frames, walkers, and orthotics (custom braces) may be recommended.

Occupational therapy. Occupational therapists help with hand function, feeding, dressing, and adaptive equipment. Some children benefit from soft splints or arm braces that reduce repetitive hand movements enough to allow more purposeful use.

Speech and communication therapy. Although most people with Rett syndrome do not speak, many understand far more than they can express. Speech and language therapists work on communication through eye gaze, picture boards, switches, and eye-tracking devices, a form of augmentative and alternative communication (AAC). Eye-gaze technology has become an important tool for many families.

Nutrition and feeding support. Chewing and swallowing difficulties, reflux, and poor weight gain are common. A dietitian may recommend higher-calorie foods, thickened liquids, or changes in food texture. In some cases, a feeding tube placed into the stomach (gastrostomy) is suggested to ensure safe, adequate nutrition.

Management of scoliosis. Spinal curvature is monitored with regular examinations and X-rays. Mild curves may be observed or braced. If the curve becomes severe or affects breathing or sitting, spinal fusion surgery may be considered, with the decision weighed carefully against the risks for each individual.

Heart and breathing monitoring. Periodic ECGs check for prolonged QT interval, and doctors may avoid certain medicines that can worsen it. Breathing irregularities themselves are usually not dangerous, but the care team will discuss what is expected and what is not.

Dental, bone, and general health care. Teeth grinding, reduced bone density, and fractures are more common, so dental checks, attention to calcium and vitamin D, and safe handling are part of routine care.

Psychological and family support. Caring for a child with a complex lifelong condition affects the whole family. Counseling, respite care, and connection with patient organizations are often recommended as part of the care plan.

Research into therapies that target the underlying gene, such as gene therapy and approaches that reactivate the healthy copy of MECP2, is ongoing. These remain experimental, and any participation in clinical trials should be discussed with the treating team.

Living with Rett syndrome and outlook

Rett syndrome is a lifelong condition, and its course differs considerably from one person to another. The severity of symptoms is partly related to the specific MECP2 change, but it also depends on factors that are not fully understood. Some people remain able to walk and interact actively into adulthood; others need full assistance with mobility and daily care.

Many people with Rett syndrome live into adulthood and, in many cases, into middle age. Life expectancy is reduced compared with the general population, mainly because of complications such as severe seizures, breathing or heart rhythm problems, pneumonia related to swallowing difficulties, and the effects of severe scoliosis or poor nutrition. Good coordinated care aims to reduce these risks, though no outcome can be guaranteed.

Daily life usually involves a structured routine of therapies, school or day programs adapted to the child’s needs, and regular medical follow-up. Families often find that, after the regression period, their child becomes more settled, engaged, and communicative through eye contact and expression. Recognizing and responding to these forms of communication is a central part of living well with the condition.

Planning for the transition from pediatric to adult services is important, as adults with Rett syndrome continue to need neurological, orthopedic, gastrointestinal, and rehabilitation care. Caregivers also need support for their own health and well-being over the long term.

Frequently asked questions

What are the first signs of Rett syndrome?

The earliest Rett syndrome symptoms are often subtle and appear between about six and eighteen months. They may include reduced eye contact, less interest in toys, delays in sitting or crawling, low muscle tone, and a slowing of head growth. Because these signs are nonspecific, the diagnosis is usually not made until the child loses hand skills and words, typically between one and four years.

Is Rett syndrome inherited from parents?

In most cases, no. The MECP2 gene change that causes Rett syndrome usually arises spontaneously and is not found in either parent. Inherited cases are rare. A genetic counselor can review the family’s specific test results and explain what they mean for siblings and future pregnancies.

How is Rett syndrome diagnosed?

Rett syndrome diagnosis is based on the child’s developmental history and examination compared against established clinical criteria, particularly a period of regression with loss of hand skills and speech, hand stereotypies, and walking difficulties. A blood test looking for changes in the MECP2 gene is used to confirm the diagnosis in most cases, and an EEG and ECG are commonly performed to check for seizures and heart rhythm changes.

Can Rett syndrome be cured?

There is currently no cure. Rett syndrome treatment focuses on managing symptoms such as seizures, breathing and digestive problems, scoliosis, and communication difficulties, and on supporting mobility and daily function through therapy. A medication specifically approved for Rett syndrome exists in some countries, but it improves certain symptoms rather than curing the condition. Research into gene-based therapies is ongoing but remains experimental.

Does Rett syndrome affect boys?

Rarely. Because the MECP2 gene is on the X chromosome and boys have only one X chromosome, a mutation usually causes very severe problems in infancy or a different pattern of neurological symptoms rather than the classic picture seen in girls. Boys with certain milder MECP2 changes or with an extra X chromosome may show features closer to typical Rett syndrome.

Is Rett syndrome the same as autism?

No, although the two can look similar during the regression stage, when a child withdraws socially and loses speech. Rett syndrome has a known genetic cause and a characteristic pattern of hand stereotypies, breathing irregularities, and slowed head growth. Many children with Rett syndrome later regain interest in people and communicate with their eyes, which is one reason it is now classified separately from autism spectrum disorder.

What is the life expectancy for someone with Rett syndrome?

It varies widely and cannot be predicted for an individual. Many people with Rett syndrome live into adulthood and, in many cases, into middle age. Life expectancy is generally shorter than average, mainly because of complications such as seizures, breathing or heart rhythm problems, and swallowing-related lung infections. Consistent medical follow-up aims to reduce these risks.

When to see a doctor

If your child seems to be losing skills she previously had, such as using her hands purposefully, saying words, or moving around, it is important to arrange a developmental evaluation with a pediatrician or pediatric neurologist rather than waiting to see whether the skills return. Early recognition allows therapies and monitoring to start sooner.

For a child or adult already diagnosed with Rett syndrome, seek urgent medical care if you notice any of the following red-flag signs:

• A seizure lasting longer than five minutes, repeated seizures without recovery in between, or a first-ever seizure.
• Difficulty breathing that does not settle, blue or gray color around the lips, or long pauses in breathing accompanied by unresponsiveness.
• Fainting, collapse, or an unusually fast, slow, or irregular heartbeat.
• Choking during feeding, persistent coughing or wheezing after meals, or fever with rapid breathing, which may suggest food or liquid has entered the lungs.
• Signs of dehydration or severe constipation, such as a swollen hard abdomen, repeated vomiting, or no urine for many hours.
• A fall or injury with pain, swelling, or reluctance to move a limb, since bones can be more fragile.
• Sudden marked change in behavior, inconsolable crying, or loss of a skill that was stable, which may signal pain or a new medical problem.

Routine follow-up with the care team is also recommended for gradual changes, such as worsening spinal curvature, weight loss, new sleep problems, or increasing difficulty with walking or sitting, so that treatment can be adjusted.