Synonyms: Raynaud-Claes syndrome
A rare X-linked syndromic intellectual disability characterized by intellectual disability of variable degree behavioral anomalies (including autism mood disorders obsessive-compulsive behavior and hetero- and auto-aggression) and epilepsy. Progressive neurological symptoms like movement disorders and spasticity as well as subtle dysmorphic features have also been reported. Heterozygous females may be as severely affected as males.
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 February 2026
Newly diagnosed with
CLCN4-related X-linked intellectual disability syndrome?
Our RARE Concierge Services Guides are available to assist you by providing information, resources and connections as you navigate your rare disease journey.
Advocacy Organizations
COMBINEDBrain Inc
COMBINEDBrain is a consortium for outcome measures and biomarkers for neurodevelopmental disorders. We are collaborating to cure rare, non-verbal brain disorders.
Cure CLCN4
Cure CLCN4 is a registered charity aimed at providing support, raising awareness and funding medical and scientific research for effective treatments for CLCN4-related neurodevelopment condition, a rare genetic condition that causes intellectual disability and other problems such as epilepsy, behavioural disorders, movement disorders and microcephaly.
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.
Moonshots for Unicorns
Curing single-gene disorders
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.
Syndromes Without A Name (SWAN) Australia
Provide information, support and advocacy to families caring for a child with an undiagnosed or rare genetic condition.
TNPO2 Foundation
Develop personalized therapeutics for ultra rare genetic neurodevelopmental diseases, especially those arising from mutations in the TNPO2 gene.
Wave of Support, Inc
Empowering those affected by bleeding disorders and other rare disease through advocacy, resources, education, and support
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Clinical Trials
For a list of clinical trials in this disease area, please click here.