NORD's
Washington Office
 Read about events on Capitol Hill, funding for rare-disease research, and other topics of interest from NORD's office in Washington, DC.
|
|
|
The National Organization for Rare Disorders (NORD) web site, its databases,
and the contents thereof are copyrighted by NORD. No part of the NORD web
site, databases, or the contents may be copied in any way, including but not
limited to the following: electronically downloading, storing in a retrieval
system, or redistributing for any commercial purposes without the express
written permission of NORD. Permission is hereby granted to print one hard
copy of the information on an individual disease for your personal use,
provided that such content is in no way modified, and the credit for the
source (NORD) and NORD’s copyright notice are included on the printed copy.
Any other electronic reproduction or other printed versions is strictly
prohibited.
The information in NORD's Rare Disease Database is for educational purposes only. It
should never be used for diagnostic or treatment purposes. If you have questions regarding
a medical condition, always seek the advice of your physician or other qualified health
professional. NORD's reports provide a brief overview of rare diseases. For more specific
information, we encourage you to contact your personal physician or the agencies listed as
"Resources" on this report.
Copyright 1996, 2001, 2009
NORD is very grateful to Shashikant Kulkarni, PhD, Director of CytoGenomics and Molecular Pathology, Director of Clinical & Molecular Cytogenetics, Department of Pathology, Washington University School of Medicine, for assistance in the preparation of this report.
Synonyms of Chromosome 18, Tetrasomy 18p
- Tetrasomy, Short Arm of Chromosome 18
Disorder Subdivisions
General Discussion
Chromosome 18, Tetrasomy 18p is a very rare chromosomal disorder in which the short arm of the 18th chromosome (18p) appears four times (tetrasomy) rather than twice in cells of the body. Individuals with a normal chromosomal make-up (karyotype) have two 18th chromosomes, both of which have a short arm ("18p") and a long arm ("18q"). However, in individuals with Chromosome 18, Tetrasomy 18p, four short arms (18ps) are present in cells of the body rather than the normal two.
The symptoms of Chromosome 18, Tetrasomy 18p may vary from case to case. Many affected individuals may have abnormalities of the head and facial (craniofacial) area; malformations of the spine, hands, and/or feet; neuromuscular abnormalities, such as increased muscle tone (hypertonia), increased reflex reactions (hyperreflexia), and difficulty coordinating movement; kidney (renal) malformations; and/or additional physical abnormalities. In addition, children and adults with Chromosome 18, Tetrasomy 18p often exhibit moderate to severe mental retardation, limitations in speech, and/or behavioral abnormalities. In most cases, Chromosome 18, Tetrasomy 18p is the result of a spontaneous (de novo) genetic change (mutation) early in embryonic development that occurs for unknown reasons (sporadic).
Organizations related to Chromosome 18, Tetrasomy 18p
- AmeriFace
PO Box 751112
Las Vegas NV 89136
Phone #: 702-769-9264
800 #: 888-486-1209
e-mail: info@ameriface.org
Home page: http://www.ameriface.org
- Arc
1660 L Street, NW, Suite 301
Washington DC 20036
Phone #: 202-534-3700
800 #: 800-433-5255
e-mail: info@thearc.org
Home page: http://www.thearc.org
- Children's Craniofacial Association
13140 Coit Road
Suite 517
Dallas TX 75240
Phone #: 214-570-9099
800 #: 800-535-3643
e-mail: contactCCA@ccakids.com
Home page: http://www.ccakids.com
- Chromosome 18 Registry & Research Society
7155 Oakridge Drive
San Antonio TX 78229
Phone #: 210-657-4968
800 #: --
e-mail: office@chromosome18.org
Home page: http://www.chromosome18.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
- Craniofacial Foundation of America
975 East Third Street
Chattanooga TN 37403
Phone #: 423-778-9176
800 #: 800-418-3223
e-mail: terry.smyth@erlanger.org
Home page: http://www.craniofacialfoundation.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
- 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 Kidney and Urologic Diseases Information Clearinghouse
3 Information Way
Bethesda MD 20892-3580
Phone #: N/A
800 #: 800-891-5390
e-mail: nkudic@info.niddk.nih.gov
Home page: http://www.kidney.niddk.nih.gov/
- National Kidney Foundation
30 East 33rd Street
New York NY 10016
Phone #: 212-889-2210
800 #: 800-622-9010
e-mail: info@kidney.org
Home page: http://www.kidney.org
- Support Organization for Trisomy 18, 13, and Related Disorders
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
- Tetrasomy 18p Canada
Toronto , ON Canada
None None None
Phone #: 416--76-8-7311
800 #: N/A
e-mail: johnvel@telus.net
Home page: http://www.tetrasomy18p.ca
- 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
|
|
