Short answer · Medically reviewed summary · Last updated: 2026-04-06
Marfan syndrome is a genetic condition that is typically inherited in an autosomal dominant pattern, though it can also occur as a spontaneous, or de novo, mutation in individuals with no family history of the disorder. Understanding the Inheritance Pattern Because Marfan syndrome follows an autosomal dominant inheritance pattern, an individual with the condition has a 50% chance of passing the causative FBN1 gene mutation to each of their children. "Autosomal" means the gene is located on one of the non-sex chromosomes, and "dominant" means that only one copy of the mutated gene is required to express the clinical features of Marfan syndrome.
5 people with Marfan Syndrome have shared their first-person experience on this question at DiseaseMaps.
Is Marfan Syndrome hereditary?
Is Marfan Syndrome hereditary? The genetic component explained in plain language, reviewed against medical sources, with patient experiences.
Marfan syndrome is a genetic condition that is typically inherited in an autosomal dominant pattern, though it can also occur as a spontaneous, or de novo, mutation in individuals with no family history of the disorder.
Understanding the Inheritance Pattern
Because Marfan syndrome follows an autosomal dominant inheritance pattern, an individual with the condition has a 50% chance of passing the causative FBN1 gene mutation to each of their children. "Autosomal" means the gene is located on one of the non-sex chromosomes, and "dominant" means that only one copy of the mutated gene is required to express the clinical features of Marfan syndrome. While many cases are inherited from an affected parent, approximately 25% of cases arise from a de novo mutation, meaning the genetic change occurred spontaneously in the egg or sperm cell prior to conception.
Genetic Testing and Counseling
Genetic testing for Marfan syndrome involves sequencing the FBN1 gene to identify a pathogenic variant. This testing is highly recommended to confirm a clinical diagnosis, especially when symptoms are ambiguous. Because the clinical presentation of Marfan syndrome can vary significantly even within the same family—a concept known as variable expressivity—genetic counseling is essential. A genetic counselor can help families understand their specific recurrence risks and discuss reproductive options, such as preimplantation genetic testing (PGT) during in vitro fertilization or prenatal diagnosis through amniocentesis or chorionic villus sampling.
If you or a family member are considering family planning, a specialized genetic counselor can provide personalized guidance regarding the transmission of Marfan syndrome. They play a vital role in helping families navigate the emotional and clinical complexities of hereditary connective tissue disorders.
Medical Disclaimer: This information is for educational 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 you may have regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD)
- Online Mendelian Inheritance in Man (OMIM)
- The Marfan Foundation
- Orphanet
Posted Oct 15, 2017 by Bonita 950
Posted Oct 16, 2017 by Amelie 100
However, neither on my parents have it, they were both missing a gene, the FBN1, fibrillin gene & therefore I didn’t get any of this gene and was born with Marfan Syndrome.
My two older brothers are healthy, and do not have Marfans.
Posted Nov 25, 2017 by Angela 500
Marfan syndrome is hereditary, which means it can be passed to a child from a parent who's affected. In around three-quarters (75%) of cases, Marfan syndrome is inherited from 1 parent. The syndrome is autosomal dominant, which means a child can inherit it even if only 1 parent has the syndrome. (Source: www. nhs.uk)
Posted Jul 23, 2021 by Sabine D. 300
You can be spontaneous
Posted Oct 5, 2017 by Helena 2550
