Synonyms: FRAXA syndrome | FXS | FraX syndrome | Martin-Bell syndrome
A rare genetic disease associated with mild to severe intellectual deficit that may be associated with behavioral disorders and characteristic physical features including a high forehead prominent and large ears hyperextensible finger joints flat feet with pronation and in adolescent and adult males macroorchidism.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
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Fragile X syndrome?
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Advocacy Organizations
FamilieSCN2A Foundation
Our MISSION is to accelerate research, build community and advocate to improve the lives of those affected by SCN2A-related disorders around the world.
Genetic Epilepsy Team Australia
Collaboration of research and care
Genetic Support Network of Victoria
The Genetic Support Network of Victoria is an organisation that supports people living with genetic, undiagnosed and rare conditions and those who support them including community and families, patient support organisations, health professionals and industry. Our vision is our community flourishing and living their best lives.
Helping Swans Co.
Promoting disability awareness and inclusion through education and support services. They highlight rare and undiagnosed diseases and provide initiatives in schools, hospitals, and other organizations to create a more inclusive world. The organization was founded by a disabled Latina mother of a rare child with autism, with a focus on diversity and underrepresented communities.
KIF1A.ORG
KIF1A.ORG is a global community dedicated to improving the lives of those affected by KIF1A Associated Neurological Disorder (KAND) and accelerating research to find a cure.
MAST Genes Research Foundation
Connecting families and fueling research into microtubule-associated serine/threonine kinase (MAST) genetic mutations to improve the quality of life and develop therapies to support affected patients and families.
National Fragile X Foundation
The National Fragile X Foundation has a mission to serve the entire Fragile X community to live their best lives by providing the knowledge, resources, and tools until, and even after, more effective treatments and a cure are achieved. We achieve this with the support and focus on our community through four strategic priority areas: Advocacy, Education, Research, and Treatment.
PPP2CA Pathways
PPP2CA Pathways connects families, shares strength, and supports the research community in the search for answers to Houge-Janssens Syndrome type 3.
Rare Epilepsy Network (REN)
Improving outcomes of people with rare epilepsies through an innovative collaborative infrastructure that drives urgent, patient-centered research, educaiton and advocacy.
SCN2A Foundation
The SCN2A Foundation is a global initiative dedicated towards accelerating research and treatment for SCN2A. We plan to achieve this by building collaborative networks among the global research community, organizing resources, and strategically investing in highly focused research directed towards therapeutic development.
TRND Network
The TRND Network is dedicated to supporting patients and their loved ones by providing advocacy and support, advancing research, and creating collaboration between researchers and patients.
The SHANK2 Foundation
To improve the quality of life for individuals affected by SHANK2 disorders
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Clinical Trials
For a list of clinical trials in this disease area, please click here.