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Copyright 1995, 1996, 2001
Synonyms of Chromosome 9, Tetrasomy 9p
- Chromosome 9, Tetrasomy 9p Mosaicism
- Mosaic Tetrasomy 9p
- Tetrasomy 9p
- Tetrasomy, Short Arm of Chromosome 9
Disorder Subdivisions
General Discussion
Chromosome 9, Tetrasomy 9p is a very rare chromosomal disorder in which the short arm of the ninth chromosome (9p) appears four times (tetrasomy) rather than twice in all or some cells of the body. Individuals with a normal chromosomal make-up (karyotype) have two 9th chromosomes, both of which have a short arm ("9p") and a long arm ("9q"). However, in individuals with Chromosome 9, Tetrasomy 9p, four short arms (9ps) are present in cells rather than the normal two.
The symptoms of Chromosome 9, Tetrasomy 9p may vary greatly in range and severity from case to case. Associated abnormalities may include mild growth retardation, moderate to severe delay in the attainment of skills requiring the coordination of muscular and mental activities (psychomotor retardation), and/or moderate to severe mental retardation. In addition, the disorder may be characterized by various physical abnormalities, such as malformations of the skull and facial (craniofacial) region, abnormalities of the hands and fingers, skeletal malformations, and/or heart (cardiac) defects. Chromosome 9, Tetrasomy 9p appears to result from spontaneous (de novo) errors very early in embryonic development that occur for unknown reasons (sporadically).
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Organizations related to Chromosome 9, Tetrasomy 9p
- American Heart Association
7272 Greenville Avenue
Dallas TX 75231-4596
Phone #: 214-373-6300
800 #: 800-242-8721
e-mail: Review.personal.info@heart.org
Home page: http://www.americanheart.org
- Chromosome Disorder Outreach, Inc.
P.O. Box 724
Boca Raton FL 33429-0724
Phone #: 561-395-4252
800 #: N/A
e-mail: info@chromodisorder.org
Home page: http://www.chromodisorder.org
- 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
- Support Organization for Trisomy 18, 13, and Related Disorders SOFT
2982 South Union Street
Rochester NY 14624-1926
Phone #: N/A
800 #: 800-716-7638
e-mail: barbv@trisomy.org
Home page: http://www.trisomy.org
- Trisomy 9 International Parent Support (9TIPS)
4027 E. Piedmont Drive
Highland CA 92346
Phone #: 909-862-4470
800 #: --
e-mail: atoddna@sprynet.com
Home page: http://www.trisomy9.org/9tips.htm
- 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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