Short answer · Medically reviewed summary · Last updated: 2026-05-08
Freeman-Sheldon Syndrome is a genetic condition that follows an autosomal dominant inheritance pattern, meaning a single copy of the mutated gene is sufficient to cause the disorder. While it is hereditary, the vast majority of cases occur as de novo (spontaneous) mutations, meaning the affected individual is the first in their family to have the condition. Is Freeman-Sheldon Syndrome hereditary? Freeman-Sheldon Syndrome is a genetic disorder typically caused by mutations in the MYH3 gene.
2 people with Freeman Sheldon Syndrome have shared their first-person experience on this question at DiseaseMaps.
Is Freeman Sheldon Syndrome hereditary?
Is Freeman Sheldon Syndrome hereditary? The genetic component explained in plain language, reviewed against medical sources, with patient experiences.
Freeman-Sheldon Syndrome is a genetic condition that follows an autosomal dominant inheritance pattern, meaning a single copy of the mutated gene is sufficient to cause the disorder. While it is hereditary, the vast majority of cases occur as de novo (spontaneous) mutations, meaning the affected individual is the first in their family to have the condition.
Is Freeman-Sheldon Syndrome hereditary?
Freeman-Sheldon Syndrome is a genetic disorder typically caused by mutations in the MYH3 gene. Because it follows an autosomal dominant inheritance pattern, an individual with Freeman-Sheldon Syndrome has a 50% chance of passing the condition to each of their children. However, because most instances arise from a de novo mutation in the egg or sperm cell, parents of an affected child usually do not carry the mutation themselves and have a very low risk of having another child with the syndrome.
How is Freeman-Sheldon Syndrome diagnosed genetically?
Clinical diagnosis of Freeman-Sheldon Syndrome is based on characteristic physical features, such as a "whistling" face, microstomia (small mouth), and joint contractures. Genetic testing is used to confirm the diagnosis by identifying a pathogenic variant in the MYH3 gene. Genetic counseling is strongly recommended for families to understand their specific recurrence risks and reproductive options.
What are the options for genetic counseling and testing?
If you or a family member is affected by Freeman-Sheldon Syndrome, consider the following steps:
- Clinical Confirmation: Seek molecular genetic testing to confirm the specific MYH3 mutation.
- Parental Testing: Geneticists often test parents to determine if the mutation was inherited or is de novo.
- Reproductive Planning: Families may explore options like prenatal diagnosis (e.g., amniocentesis) or preimplantation genetic testing (PGT) if they are at risk of passing the mutation to future children.
- Community Support: Connect with the 32 people with Freeman-Sheldon Syndrome currently sharing their experiences on DiseaseMaps.org to find peer support.
Next steps
- Consult with a clinical geneticist to discuss your specific family history and genetic test results.
- Speak with a certified genetic counselor to review reproductive options and family planning.
- Join the Freeman-Sheldon Syndrome community at DiseaseMaps.org to connect with others navigating this rare diagnosis.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment; always seek the advice of your physician or qualified health provider.
References
- NIH Genetic and Rare Diseases (GARD) Information Center: Freeman-Sheldon Syndrome.
- OMIM (Online Mendelian Inheritance in Man): Entry #193700 (Freeman-Sheldon Syndrome).
- Orphanet: Rare disease database entry for Freeman-Sheldon Syndrome.
- PubMed: Clinical literature regarding MYH3 gene mutations and distal arthrogryposis spectrum.
Posted Oct 5, 2017 by Jrdtmk 1500
I've done some DNA comparison with "cousins" on various platforms and in our case it seems to have been inherited on chromosome 17 - which is where our TIPTON ancestry resides.
Posted Nov 19, 2022 by Cheri 650
