XYY

XYY syndrome is a genetic condition in which a human male has an extra Y chromosome. Symptoms are usually few. They may include being taller than average, acne, and an increased risk of learning problems. The person is generally otherwise normal, including normal fertility. The condition is generally not inherited from a person's parents but rather occurs as a result of a random event during sperm cell development.

Causes

XYY syndrome is caused by the presence of a single extra copy of the Y chromosome in each of a male's cells. This can occur as a random event during the formation of sperm cells. The condition is not typically inherited from a person's parents.

Diagnosis

Diagnosis can be made based on prenatal tests, or it may occur during childhood or adulthood if a person has signs or symptoms related to XYY syndrome. However, some males with the condition may never know they have it unless they undergo genetic testing for other reasons.

Treatment

There is no cure for XYY syndrome. Treatment, if needed, is based on the signs and symptoms present in each person. For example, a child with learning disabilities may benefit from special education.

Epidemiology

XYY syndrome occurs in about 1 in 1,000 male births. But because symptoms are often subtle or nonexistent, the condition is likely underdiagnosed.

See also

• Klinefelter syndrome
• Turner syndrome
• Triple X syndrome

References

XYY Resources
Need Help Finding a Doctor? Need help finding a doctor or specialist anywhere in the world? Explore our world directory. WikiMD's DocFinder can assist you in locating millions of physicians.	Medical Knowledge Access the latest research - Most recent articles Ongoing trials.

Translate to: East Asian 中文, 日本, 한국어, South Asian हिन्दी, Urdu, বাংলা, తెలుగు, தமிழ், ಕನ್ನಡ,
Southeast Asian Indonesian, Vietnamese, Thai, မြန်မာဘာသာ, European español, Deutsch, français, русский, português do Brasil, Italian, polski