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NIH GARD Information: 47, XYY syndrome

This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).

Synonyms

  • YY syndrome
  • XYY syndrome
  • XYY Karyotype
  • Jacobs syndrome
  • 47,XYY syndrome
  • Disomy Y
  • Double Y
  • Double Y syndrome
  • Y disomy

Overview

47, XYY syndrome is a syndrome (group of signs and symptoms) that affects males. For some males with this syndrome, signs and symptoms are barely noticeable. For others, signs and symptoms may include learning disabilities, speech delay, low muscle tone (hypotonia), and being taller than expected.[3368][11226]                         

47, XYY syndrome is caused by having an extra copy of the Y chromosome in every cell of the body.[3368] The syndrome is usually not inherited. Diagnosis can be made based on prenatal tests, or it may occur during childhood or adulthood if a male has signs or symptoms of the disease. Management may include special education as well as intervention or therapies for developmental delays.[11226]

For more information, visit GARD.

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