Short answer · Medically reviewed summary · Last updated: 2026-04-07

TL;DR: Coffin-Lowry syndrome is a rare genetic disorder characterized by intellectual disability, distinctive facial features, and skeletal abnormalities. It is caused by mutations in the RPS6KA3 gene and typically follows an X-linked dominant inheritance pattern, meaning it affects both males and females, though often more severely in males. What is Coffin-Lowry syndrome? Coffin-Lowry syndrome is a complex genetic condition that affects multiple body systems, most notably the musculoskeletal system and cognitive development.

What is Coffin-Lowry syndrome

Name: What is Coffin-Lowry syndrome
Creator: DiseaseMaps Editorial Team
Published: 2015-10-06UTC00:54:11.0000000

What is Coffin-Lowry syndrome? Plain-language, medically reviewed definition plus the lived reality told by patients.

TL;DR: Coffin-Lowry syndrome is a rare genetic disorder characterized by intellectual disability, distinctive facial features, and skeletal abnormalities. It is caused by mutations in the RPS6KA3 gene and typically follows an X-linked dominant inheritance pattern, meaning it affects both males and females, though often more severely in males.

What is Coffin-Lowry syndrome?

Coffin-Lowry syndrome is a complex genetic condition that affects multiple body systems, most notably the musculoskeletal system and cognitive development. Individuals living with Coffin-Lowry syndrome often experience delayed motor development, speech delays, and mild to profound intellectual disability. Because it is a multisystem disorder, the clinical presentation can be broad, ranging from subtle physical features to significant developmental challenges. Within the DiseaseMaps.org community, 84 people with Coffin-Lowry syndrome have shared their journeys, highlighting the importance of peer support in navigating this rare diagnosis.

What causes Coffin-Lowry syndrome?

The underlying cause of Coffin-Lowry syndrome is a mutation in the RPS6KA3 gene located on the X chromosome. This gene provides instructions for making a protein involved in cell signaling, which is essential for normal brain development and the maintenance of bone and cartilage. Because the gene is located on the X chromosome, the condition is inherited in an X-linked dominant pattern. While most cases arise from spontaneous (de novo) mutations in individuals with no family history, those who inherit the gene variant may have varying degrees of severity depending on how the X chromosome is expressed.

What are the primary symptoms and physical characteristics?

The clinical features of Coffin-Lowry syndrome are diverse. While no two individuals are exactly the same, clinicians frequently observe a combination of neurological and physical findings. Key characteristics include:

Distinctive facial features: Often including a prominent forehead, downward-slanting eyes, a wide mouth with full lips, and widely spaced teeth.

Skeletal abnormalities: Commonly including short stature, tapering fingers (often described as "soft" or fleshy), and potential spinal curvature (scoliosis).

Stimulus-induced drop attacks: A hallmark feature where a loud noise or sudden touch causes a brief loss of muscle tone, leading the individual to collapse.

Developmental delays: Significant challenges with speech, motor coordination, and cognitive processing.

How common is Coffin-Lowry syndrome?

Coffin-Lowry syndrome is considered an ultra-rare condition. While exact global prevalence is difficult to determine due to potential underdiagnosis or misdiagnosis, estimates suggest it affects approximately 1 in 50,000 to 1 in 100,000 individuals worldwide. It affects both males and females; however, males are typically more severely affected because they have only one X chromosome. Females, having two X chromosomes, may exhibit a milder phenotype due to the process of X-inactivation, though this can vary significantly between individuals.

How is it differentiated from other conditions?

Coffin-Lowry syndrome is often compared to other genetic syndromes involving intellectual disability and skeletal changes, such as Mowat-Wilson syndrome or Coffin-Siris syndrome. However, the specific combination of the RPS6KA3 mutation, the presence of soft, tapering fingers, and the unique reaction to sudden auditory or tactile stimuli (drop attacks) helps medical professionals distinguish Coffin-Lowry syndrome from these other conditions.

Next steps

Consult with a clinical geneticist to confirm the diagnosis through molecular genetic testing of the RPS6KA3 gene.

Connect with the 84 community members on DiseaseMaps.org to share experiences and coping strategies.

Schedule multidisciplinary evaluations, including physical therapy, speech therapy, and cardiology screenings, as heart issues can occasionally be associated with the syndrome.

Look for specialized support through organizations like the National Organization for Rare Disorders (NORD) or the Coffin-Lowry Syndrome Foundation.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.