Short answer · Medically reviewed summary · Last updated: 2026-05-08
TL;DR: Cohen syndrome is a rare genetic disorder characterized by developmental delay, intellectual disability, microcephaly, and distinct facial features. It is caused by mutations in the VPS13B gene and follows an autosomal recessive inheritance pattern. What are the primary clinical features of Cohen syndrome? Cohen syndrome affects multiple body systems, leading to a diverse range of clinical presentations.
What is Cohen Syndrome
What is Cohen Syndrome? Plain-language, medically reviewed definition plus the lived reality told by patients.
TL;DR: Cohen syndrome is a rare genetic disorder characterized by developmental delay, intellectual disability, microcephaly, and distinct facial features. It is caused by mutations in the VPS13B gene and follows an autosomal recessive inheritance pattern.
What are the primary clinical features of Cohen syndrome?
Cohen syndrome affects multiple body systems, leading to a diverse range of clinical presentations. While symptoms vary significantly between individuals, the most common characteristics of Cohen syndrome include:
- Developmental delays, particularly in motor skills and speech.
- Mild to moderate intellectual disability.
- Microcephaly (an abnormally small head size) that often becomes more apparent during childhood.
- Distinctive facial features, such as down-slanting palpebral fissures, a short philtrum, and high-arched palate.
- Progressive myopia (nearsightedness) and retinal dystrophy, which can lead to vision loss.
- Neutropenia, a condition characterized by a low level of white blood cells, which may increase susceptibility to infections.
What causes Cohen syndrome?
Cohen syndrome is caused by pathogenic variants in the VPS13B gene (formerly known as COH1). This gene provides instructions for producing a protein involved in the Golgi apparatus, which acts as the "post office" of the cell by packaging and transporting proteins. When this gene is mutated, the cellular transport system fails to function correctly, disrupting normal development. Cohen syndrome is inherited in an autosomal recessive manner, meaning an individual must inherit one mutated copy of the gene from each parent to be affected.
How common is Cohen syndrome?
Cohen syndrome is an extremely rare condition with an estimated prevalence of less than 1 in 100,000 individuals worldwide. Because of its rarity and the potential for misdiagnosis, the true incidence may be higher. At DiseaseMaps.org, 118 people with Cohen syndrome have joined our community, providing a vital network for shared experiences and support for families navigating this diagnosis.
What differentiates Cohen syndrome from other conditions?
While Cohen syndrome shares features like developmental delay with other genetic syndromes, it is clinically distinguished by the combination of progressive myopia, chronic neutropenia, and a specific "friendly" personality profile often noted in affected individuals. Unlike many other neurodevelopmental disorders, the characteristic facial features and the specific pattern of retinal degeneration help clinicians identify Cohen syndrome more accurately.
Next steps
- Consult a clinical geneticist for formal diagnostic testing and family counseling.
- Schedule regular evaluations with an ophthalmologist to monitor vision changes.
- Join the Cohen syndrome community at DiseaseMaps.org to connect with others and share experiences.
- Work with a multidisciplinary team including speech, occupational, and physical therapists.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Cohen Syndrome
- Orphanet: Cohen Syndrome (ORPHA:193)
- OMIM (Online Mendelian Inheritance in Man): Cohen Syndrome (#216550)
- PubMed: Clinical and genetic overview of VPS13B-related disorders.
