Is Cohen Syndrome hereditary?

Cohen syndrome is a rare genetic disorder that is inherited in an autosomal recessive pattern, meaning an affected individual must inherit two copies of a mutated VPS13B gene (one from each parent). Because it is hereditary, siblings of an affected child have a 25% chance of inheriting the condition, while children of an affected individual are typically carriers unless the other parent is also a carrier.

Is Cohen syndrome hereditary?

Yes, Cohen syndrome is strictly a genetic and hereditary condition. It is caused by pathogenic variants in the VPS13B gene (formerly known as COH1). Because it follows an autosomal recessive inheritance pattern, parents of a child with Cohen syndrome are almost always asymptomatic carriers, each carrying one copy of the mutated gene. While de novo (spontaneous) mutations can technically occur in any gene, they are extremely rare in Cohen syndrome; the vast majority of cases arise from inherited mutations passed down through families.

What is the risk of recurrence for families?

When both parents are known carriers of a VPS13B mutation, the following statistical risks apply for each pregnancy:

• 25% chance the child will have Cohen syndrome.


• 50% chance the child will be an asymptomatic carrier.


• 25% chance the child will not inherit any mutation.

How is Cohen syndrome diagnosed genetically?

Molecular genetic testing is the gold standard for confirming a diagnosis of Cohen syndrome. Testing typically involves sequence analysis of the VPS13B gene to identify pathogenic variants. If clinical symptoms—such as microcephaly, developmental delay, and characteristic facial features—are present, a clinical geneticist will recommend genetic testing to confirm the diagnosis. In our DiseaseMaps community, 118 people with Cohen syndrome have shared their experiences, highlighting the importance of early molecular confirmation for accessing appropriate multidisciplinary care.

What is the role of genetic counseling?

Genetic counseling is vital for families affected by Cohen syndrome. Counselors provide clarity on the hereditary nature of the condition, explain the 25% recurrence risk, and discuss reproductive options. For those planning pregnancies, carrier testing for partners and prenatal diagnostic options, such as chorionic villus sampling (CVS) or amniocentesis, may be discussed if the specific familial mutations are known.

Next steps

• Consult a board-certified clinical geneticist to discuss molecular testing for Cohen syndrome.


• Request a referral for genetic counseling to understand your specific family risk profile.


• Connect with the 118 members in the DiseaseMaps.org community to share resources and support.

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 overview.


• Online Mendelian Inheritance in Man (OMIM): Entry #216550 (Cohen syndrome).


• Orphanet: Rare disease database entry for Cohen syndrome (ORPHA:193).


• PubMed: Clinical studies on VPS13B gene mutations and diagnostic protocols.