Synonyms: Louis-Bar syndrome
A rare autosomal recessive cerebellar ataxia due to a DNA repair defect characterized by progressive neurological impairment with cerebellar syndrome oculocutaneous telangiectasia defects in B and T cell-mediated immunity and increased susceptibility to malignancies (mainly lymphoid neoplasms). High sensitivity to ionizing radiation limits patient treatments.
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 January 2026
Newly diagnosed with
Ataxia-telangiectasia?
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Advocacy Organizations
Ataxia Telangiectasia Children’s Project
The nonprofit A-T Children’s Project partners with academic and industry investigators worldwide – organizing and supporting innovative research, conferences, clinical teams, data platforms and biomarkers – to optimize disease management strategies, develop new treatments and find a cure for ataxia-telangiectasia (A-T), a rare, genetic disease.
Ataxia and me
To relieve the needs of sufferers of Ataxia or other neurological disorders, their families and carers for the public benefit by providing patient led support and by raising awareness of such conditions."
COMBINEDBrain Inc
COMBINEDBrain is a consortium for outcome measures and biomarkers for neurodevelopmental disorders. We are collaborating to cure rare, non-verbal brain disorders.
Cache DNA
At Cache, we are on a mission to store the biomolecules of today in order to unlock the possibilities of tomorrow. Our vision is to create a scalable, sustainable, and standardized platform for reliable storage and access of biomolecules by combining chemistry, biology, automation, and computational tools to support patient advocacy groups worldwide and better connect samples to insights.
Care-for-Rare America Inc
To establish a global alliance in order to identify the genetic causes of rare diseases and develop effective treatments, following a three-stage approach: recognize, understand, cure.
DDX3X Foundation
Our mission is to connect families, resources, and the medical community to advance research for a treatment or cure to DDX3X Syndrome. Our ultimate goal is to accelerate brain function in individuals affected by DDX3X Syndrome through advances in cell and gene therapy and pharmaceuticals.
Ducks For Dementia
Ducks For Dementia, founded on the profound compassion and vision of a young boy named David, aims to bring solace and understanding to individuals with dementia and their families. Our mission is rooted in the distribution of toy ducks as symbols of comfort, which serve not only as therapeutic aids but also as beacons of joy and companionship for those navigating the complexities of dementia.
Help Hope Live
Help Hope Live believes a medical crisis shouldn’t become a financial crisis. Help Hope Live supports community-based fundraising for people with unmet medical expenses and related costs due to cell and organ transplants or catastrophic injuries and illnesses. These efforts play a critical role in helping clients access the care and equipment they need to heal, live, and thrive.
Immune Deficiency Foundation
To improve the diagnosis, treatment and quality of life of people affected by primary immunodeficiency.
Jett Foundation
Jett Foundation empowers people and families impacted by Duchenne muscular dystrophy through the development of transformative programming, educational opportunities, and ongoing support for every stage of a Duchenne journey.
Moonshots for Unicorns
Curing single-gene disorders
My Faulty Gene
My Faulty Gene is a nonprofit organization which provides information and assistance to any individual whose family medical history suggests genetic testing might be helpful in identifying an increased risk of disease due to a genetic mutation. We believe that everyone in need of genetic testing should have access to it.
My Little Sunshine Foundation
My Little Sunshine is a non-profit foundation dedicated to educating people about the importance of fertility preservation and making fertility resources accessible to all.
National Ataxia Foundation
To accelerate the development of treatments and a cure while working to improve the lives of those living with Ataxia.
Project CASK
VISION Project CASK believes in a world free of the life limitations and debilitating effects of CASK gene disorders. MISSION To accelerate breakthroughs in research to develop treatments and a cure for CASK gene disorders. VALUES Collaboration. Transparency. Urgency.
Project Clio
To improve our understanding of rare and understudied autoimmune conditions
SALUS
Educate and provide resources to POC with Rare Cancers
Ukrainian Association of Pediatric Immunology
Development of pediatric and clinical immunology in Ukraine. Raising awareness of inborn errors of immunity in Ukraine and rare immune diseases; Advocacy campaigns supporting patients with rare immune diseases and their treatment plans; Scientific research; Sharing knowledge about immunoprophylaxis; Advocacy campaigns supporting immunoprophylaxis.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.