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Copyright 1990, 1992, 1998, 1999, 2002
Synonyms of XYY Syndrome
- 47,XYY Karyotype
- 47,XYY Syndrome
- Diplo-Y Syndrome
- Polysomy Y
- XYY Chromosome Pattern
- YY Syndrome
Disorder Subdivisions
General Discussion
XYY syndrome is a rare chromosomal disorder that affects males. It is caused by the presence of an extra Y chromosome. Males normally have one X and one Y chromosome. However, individuals with this syndrome have one X and two Y chromosome. Affected individuals are usually very tall and thin. Many experience severe acne during adolescence. Additional symptoms may include antisocial or behavioral problems and learning disabilities. Intelligence is usually normal, although IQ, on average, is 10 to 15 points lower than siblings.
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Organizations related to XYY Syndrome
- Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg MD 20898-8126
Phone #: 301-251-4925
800 #: 888-205-2311
e-mail: http://rarediseases.info.nih.gov/GARD/EmailForm.aspx
Home page: http://rarediseases.info.nih.gov/GARD
- Klinefelter Syndrome & Associates (KS&A)
P.O. Box 461047
Aurora CO 80046-1047
Phone #: 303-400-9040
800 #: 888-999-9428
e-mail: info@genetic.org
Home page: http://www.genetic.org
- MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay WI 54301-1243
Phone #: 920-336-5333
800 #: 877-336-5333
e-mail: mums@netnet.net
Home page: http://www.netnet.net/mums/
- March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains NY 10605
Phone #: 914-997-4488
800 #: 888-663-4637
e-mail: Askus@marchofdimes.com
Home page: http://www.marchofdimes.com
- NIH/National Institute of Mental Health
6001 Executive Blvd
Rm 8184, MSC 9663
Rockville MD 20892-9663
Phone #: 301-443-4513
800 #: --
e-mail: nimhinfo@nih.gov
Home page: http://www.nimh.nih.gov/
- National Alliance for the Mentally Ill
Colonial Place Three
2107 Wilson Blvd.
Suite 300
Arlington VA 22201-3042
Phone #: 703-524-7600
800 #: 800-999-6264
e-mail: membership@nami.org
Home page: http://www.nami.org
- National Mental Health Association
2000 North Beauregard Street
6th Floor
Alexandria VA 22311
Phone #: 703-684-7722
800 #: 800-969-6642
e-mail: infoctr@nmha.org
Home page: http://www.nmha.org
- National Mental Health Consumers' Self-Help Clearinghouse
1211 Chestnut Street
Suite 1207
Philadelphia PA 19107-6312
Phone #: 215-751-1810
800 #: 800-553-4539
e-mail: info@mhselfhelp.org
Home page: http://www.mhselfhelp.org
- UNIQUE - Rare Chromosome Disorder Support Group
P.O. Box 2189
Caterham
Surrey Intl CR3 5GN
Phone #: 44 -0 1-883 330766
800 #: --
e-mail: info@rarechromo.org
Home page: http://www.rarechromo.org
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