Synonyms: Del(2)(q23.1) | Monosomy 2q23.1 | Pseudo-Angelman syndrome
The newly described 2q23.1 microdeletion syndrome includes severe intellectual deficit with pronounced speech delay behavioral abnormalities including hyperactivity and inappropriate laughter short stature and seizures.
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
Newly diagnosed with
2q23.1 microdeletion 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
2q23.1/MAND Caregiver Support Group
The 2q23.1/MBD5 Disorders/MAND page is dedicated to improving the lives of individuals born with MBD5 differences (deletions, duplications, variants, or disruptions) and other anomalies encompassed within the genetic region of 2q23.1. We foster an engaged, knowledgeable, and welcoming worldwide community by providing access to support and resources, promoting advocacy, and funding research.
Genetic Epilepsy Team Australia
Collaboration of research and care
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 Chromosome Disorder Support Group – Unique
Through sharing knowledge and lived experience, Unique helps families and professionals navigate the world of chromosome and gene disorders
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.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.