Living with 49,XXXYY syndrome
An extremely rare chromosome condition in males with severe learning challenges and distinct facial features.
Understanding 49,XXXYY syndrome
Only a handful of cases have been reported. Signs include severe intellectual disability, distinct facial features, normal to tall stature, breast enlargement (gynecomastia), low testicular function (hypogonadism), and behavior differences. It is likely caused by a mistake (nondisjunction) at conception or when sperm or egg cells form. GARD lists onset as newborn.
Signs & symptoms
Symptoms vary from person to person. GARD lists these among the most common:
- Severe intellectual disability
- Delayed speech and language
- Low testicular function (hypogonadism)
- Breast enlargement (gynecomastia)
- Autistic behavior
- Distinct facial features
Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.
Diagnosis
- 1Talk with your doctor
Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.
- 2See a specialist
Specialists who may be involved include genetic specialists.
- 3Ask which tests can help
Your care team will decide which exams and tests can confirm the diagnosis.
- 4Connect with expert centers
Association for X and Y Chromosome Variations may keep lists of experts for this condition.
Care & treatment
- Care team
- Genetic specialists (geneticists)
- Expert care
- Expert lists: Association for X and Y Chromosome Variations
- Treatment
- GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
- Research
- Clinical trials and observational studies may be options. See the research section below.
General information, not medical advice. Your care team makes the decisions.
Everyday life
Living with a rare condition is easier with support.
- Connect with Association for X and Y Chromosome Variations and other patient organizations
- Keep notes on symptoms, changes and questions for appointments
- Ask about patient registries that help research
- Look into financial aid and travel resources for care visits
Quick facts
GARD says it is likely caused by a mistake (called nondisjunction) at conception or when sperm or egg cells form, leaving two extra X and one extra Y chromosome.
Patient organizations
- Association for X and Y Chromosome Variations49,XXXYY syndrome · United States
- Chromodiversity Foundation49,XXXYY syndrome · Chromosome Disorder Outreach
You are more than your diagnosis
Perspectives from people navigating life with 49,XXXYY syndrome.
Explore research for 49,XXXYY syndrome
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- Eligibility is confirmed by the study team
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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.
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