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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.
Chromosome 11, Partial Trisomy 11q is a rare chromosomal disorder in which the end (distal) portion of the long arm (q) of the 11th chromosome appears three times (trisomy) rather than twice in cells of the body. Although associated symptoms and findings may vary, the disorder is often associated with delayed growth before and after birth (prenatal and postnatal growth retardation); varying degrees of mental retardation; distinctive abnormalities of the skull and facial (craniofacial) region; and/or other features. Chromosomal analysis is necessary for a definite diagnosis.
Chromosome 11, Partial Trisomy 11q is commonly characterized by growth retardation before and after birth, delayed acquisition of skills requiring the coordination of mental and motor activities (psychomotor retardation), mild to moderate mental retardation, and distinctive craniofacial abnormalities.
In individuals with Partial Trisomy 11q, craniofacial abnormalities may include an abnormally small head (microcephaly) that may appear unusually short and broad (brachycephaly); a short nose; low-set ears; and/or incomplete closure of the roof of the mouth (cleft palate) or a highly arched palate. Many affected individuals also have abnormal pits or depressions and/or outgrowths of skin and cartilage in front of the ears (preauricular pits or tags); a small jaw (micrognathia); a retracted lower lip; and/or an unusually long vertical groove in the center of the upper lip (philtrum). Additional craniofacial features may sometimes include widely spaced eyes (ocular hypertelorism); downwardly slanting eyelid folds (palpebral fissures); vertical skin folds over the eyes' inner corners (epicanthal folds); and/or abnormal deviation of one eye in relation to the other (strabismus). In addition, in some cases, one side of the face may appear smaller than or relatively dissimilar to the other (facial asymmetry).
In some affected individuals, Chromosome 11, Partial Trisomy 11q may also be associated with additional physical findings. These may include skeletal abnormalities, such as malformation of the collarbone (clavicular defect) and/or dislocation or improper development (dysplasia) of the hips; structural malformations of the heart that are present at birth (congenital heart defects); and/or underdevelopment or absence of the band of nerve fibers that normally joins the two hemispheres of the brain (hypoplasia or agenesis of the corpus callosum). Additional abnormalities that have been reported in association with Partial Trisomy 11q have included an unusually short neck; abnormal looseness of the skin (cutis laxa); abnormal creases on the palms of the hands; or undescended testes (cryptorchidism) and/or an unusually small penis (micropenis) in affected males.
In individuals with Chromosome 11, Partial Trisomy 11q, the end (distal) region of the long arm (q) of chromosome 11 is present three times (i.e., trisomic or duplicated) rather than twice in cells of the body. Chromosomes are found in the nucleus of all body cells. They carry the genetic characteristics of each individual. Pairs of human chromosomes are numbered from 1 through 22, with an unequal 23rd pair of X and Y chromosomes for males and two X chromosomes for females. Each chromosome has a short arm designated as "p" and a long arm identified by the letter "q." Chromosomes are further subdivided into bands that are numbered.
Evidence suggests that Partial Trisomy 11q typically results from a translocation involving chromosome 11q and another chromosome, usually chromosome 22q. Translocations occur when regions of certain chromosomes break off and are rearranged, resulting in shifting of genetic material and an altered set of chromosomes. In individuals with Partial Trisomy 11q, such translocations most commonly appear to be transmitted by a parent who is a carrier of a "balanced" translocation. If a chromosomal rearrangement is balanced, meaning that it consists of an altered but balanced set of chromosomes, it is usually harmless to the carrier. However, such a chromosomal rearrangement may be associated with an increased risk of abnormal chromosomal development in the carrier's offspring. Chromosomal analysis may determine whether a parent has a balanced translocation. In a few cases, chromosomal rearrangements resulting in Partial Trisomy 11q have appeared to occur spontaneously for unknown reasons (de novo). In such cases, the parents of the affected child usually have normal chromosomes and a relatively low risk of having another child with the chromosomal abnormality.
Chromosome 11, Partial Trisomy 11q is a very rare chromosomal disorder that is reported to affect more females than males. Approximately 45 cases of this disorder have been documented in the medical literature.
Symptoms of the following disorders can be similar to those of Chromosome 11, Partial Trisomy 11q. Comparisons may be useful for a differential diagnosis:
Many chromosomal disorders have features similar to Chromosome 11, Partial Trisomy 11q. The only way to determine which chromosomal disorder an individual has is through genetic testing. (For more information on these disorders, choose "Chromosomal Disorder" as your search term in the Rare Disease Database.)
Chromosome 11, Partial Trisomy 11q may be diagnosed through genetic testing, either during pregnancy (prenatally) or after birth (postnatally). Prenatal procedures such as amniocentesis, chorionic villus sampling, and fetal blood sampling involve chromosomal analysis of fluid and/or tissue samples extracted from the fetus or the uterus during pregnancy (prenatally).
Treatment of Chromosome 11, Partial Trisomy 11q is symptomatic and supportive. Special education, physical therapy, and other medical, social, or vocational services are of benefit to the affected individual, and are often necessary for the child to reach his/her full potential. Genetic counseling will be of benefit for affected individuals and their families.
Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government web site.
For information about clinical trials being conducted at the NIH Clinical Center in Bethesda, MD, contact the NIH Patient Recruitment Office:
Tollfree: (800) 411-1222
TTY: (866) 411-1010
For information about clinical trials sponsored by private sources, contact:
(Please note that some of these organizations may provide information concerning certain conditions potentially associated with this disorder [e.g., mental retardation, craniofacial abnormalities, congenital heart defects, etc.].)
7272 Greenville Avenue
Dallas, TX 75231
Phone #: 214-784-7212
800 #: 800-242-8721
Home page: http://www.heart.org
P.O. Box 751112
Limekiln, PA 19535 USA
Phone #: 702-769-9264
800 #: 888-486-1209
Home page: http://www.ameriface.org
13140 Coit Road
Dallas, TX 75240 USA
Phone #: 214-570-9099
800 #: 800-535-3643
Home page: http://www.ccakids.com
P.O. Box 724
Boca Raton, FL 33429-0724 USA
Phone #: 561-395-4252
800 #: N/A
Home page: http://www.chromodisorder.org/CDO/
975 East Third Street
Chattanooga, TN 37403
Phone #: 423-778-9176
800 #: 800-418-3223
Home page: http://www.craniofacialfoundation.org
Sparkasse Pforzheim D
Wiernsheim, 85421 Germany
Phone #: 313-174-23345
800 #: --
Home page: http://www.chromosome11.eu/
PO Box 8126
Gaithersburg, MD 20898-8126
Phone #: 301-251-4925
800 #: 888-205-2311
Home page: http://rarediseases.info.nih.gov/GARD/
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White Plains, NY 10605
Phone #: 914-997-4488
800 #: 888-663-4637
Home page: http://www.marchofdimes.com
2982 S. Union Street
Rochester, NY 14624-1926
Phone #: N/A
800 #: 800-716-7638
Home page: http://www.trisomy.org
1825 K Street NW, Suite 1200
Washington, DC 20006
Phone #: 202-534-3700
800 #: 800-433-5255
Home page: http://www.thearc.org
P.O. Box 2189
Surrey, CR3 5GN United Kingdom
Phone #: 440-188-3330766
800 #: --
Home page: http://www.rarechromo.org
Buyse ML. Birth Defects Encyclopedia. Dover, MA: Blackwell Scientific Publications, Inc.; 1990:362-63.
Gorlin RJ, et al., eds. Syndromes of the Head and Neck. 3rd ed. New York, NY: Oxford University Press; 1990:86.
Wallerstein R, et al. Partial trisomy 11q in a female infant with Robin sequence and congenital heart disease. Cleft Palate Craniofac J. 1992;29:77-79.
Greig F, et al. Duplication 11 (q22--->qter) in an infant. A case report with review. Ann Genet. 1985;28:185-88.
Pihko H, et al. Partial 11q trisomy syndrome. Hum Genet. 1981;58:129-34.
Ayraud N, et al. Trisomy 11q (q23.1 - qter) through maternal translocation t(11;22) (q23.1;q11.1). A new case. Ann Genet. 1976;19:65-68.
Aurias A, et al. 2 cases of trisomy 11q(q231--qter) by translocation t(11;22) (q231;q111) in 2 different families. Ann Genet. 1975;18:185-88.
Report last updated: 2009/04/10 00:00:00 GMT+0