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RAI1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

RAI1 gene

The RAI1 gene provides instructions for making a protein that regulates gene expression, playing a critical role in brain development, craniofacial bone development, and circadian rhythms.

Normal Function

The RAI1 gene provides instructions for making a protein that is active in cells throughout the body, particularly nerve cells (neurons) in the brain. Located in the nucleus of the cell, the RAI1 protein helps control the activity (expression) of certain genes. While most of the genes regulated by RAI1 have not been identified, studies suggest this protein controls the expression of several genes involved in daily (circadian) rhythms, such as the sleep-wake cycle. The RAI1 protein also appears to play a role in the development of the brain and of bones in the head and face (craniofacial bones).

Health Conditions Related to Genetic Changes

Potocki-Lupski syndrome

Having an extra copy of the RAI1 gene in each cell is thought to underlie many of the major features of Potocki-Lupski syndrome. This condition is characterized by delayed development, mild to moderate intellectual disability, autism spectrum disorder, sleep disturbances, and other health problems.

  • Cause: The condition results from abnormal copying (duplication) of a small piece of the short (p) arm of chromosome 17 at position p11.2.
  • Mechanism: Studies suggest that the duplication increases the amount of RAI1 protein, which disrupts the expression of genes that influence circadian rhythms and brain development, leading to the neurological and developmental features of the condition.

Smith-Magenis syndrome

Researchers believe that a partial or total loss of function of the RAI1 gene accounts for most of the signs and symptoms of Smith-Magenis syndrome. The major features include mild to moderate intellectual disability, delayed speech and language skills, distinctive facial features, sleep disturbances, and behavioral problems.

  • Cause: In most people, the condition results from a deletion of a small piece of chromosome 17 (17p11.2). A small percentage of people have a mutation in the RAI1 gene instead of a chromosomal deletion.
  • Mechanism: The deletion leads to a reduced amount of RAI1 protein, which disrupts the expression of genes involved in circadian rhythms, accounting for sleep disturbances. It is unclear how the loss of one copy of the RAI1 gene leads to other physical and behavioral problems.

Yuan-Harel-Lupski syndrome

Having an extra copy of the RAI1 gene is thought to underlie many of the major features of Yuan-Harel-Lupski (YUHAL) syndrome, which is characterized by multiple neurological problems. This condition results from a duplication of a small piece of chromosome 17 (p12-p11.2).

  • Mechanism: The duplications contain the RAI1 gene and a nearby gene called PMP22. Features such as delayed development, behavioral and sleep problems, and unusual facial features are likely caused by an extra copy of the RAI1 gene. Other features, such as muscle weakness and decreased sensitivity to touch, heat, and cold in the lower legs and feet, likely result from an extra copy of the PMP22 gene.

Frequently Asked Questions

Potocki-Lupski syndrome is usually caused by a de novo (new) duplication of the RAI1 gene region, meaning it is not inherited from a parent and occurs by chance. However, in rare cases, a parent may carry a balanced translocation or a small duplication that is passed to the child. Genetic counseling is recommended to assess the specific type of genetic change and determine the recurrence risk for future pregnancies, which is generally low for de novo cases but higher if a parent carries the structural variant.
The RAI1 protein acts as a transcription factor that regulates the expression of genes critical for neuronal growth, synapse formation, and circadian rhythm regulation. When the gene is deleted (Smith-Magenis) or duplicated (Potocki-Lupski), the imbalance in RAI1 protein levels disrupts the precise timing and activity of these downstream genes during fetal brain development. This disruption impairs the formation of neural circuits, leading to the cognitive delays, autism spectrum features, and behavioral challenges observed in these syndromes.
Diagnosis typically begins with a clinical evaluation of characteristic physical features and behavioral symptoms, followed by genetic testing. While a standard karyotype may sometimes detect the deletion, chromosomal microarray (CMA) or fluorescence in situ hybridization (FISH) are the preferred tests to identify the specific 17p11.2 deletion that affects the RAI1 gene. These tests provide a definitive diagnosis by confirming the loss of genetic material responsible for the condition.
Individuals with Smith-Magenis syndrome or Potocki-Lupski syndrome often experience severe circadian rhythm disruptions, such as inverted sleep-wake cycles where they are awake at night and sleepy during the day. Management usually involves a combination of behavioral strategies, such as strict light exposure schedules, and pharmacological interventions, most commonly melatonin supplementation, to help reset the body's internal clock and improve sleep quality.
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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