Jacobsen syndrome

What causes Jacobsen syndrome?

Jacobsen syndrome is caused by a deletion of genetic material at the end of the long (q) arm of chromosome 11. The size of the deletion varies among affected people, but the deleted area almost always includes the tip of chromosome 11. The specific features of Jacobsen syndrome relate to the loss of multiple genes within the deleted region. While the exact function of some of the genes involved is unclear, they appear to be critical for normal development of many parts of the body. In general, larger deletions cause more severe signs and symptoms than smaller deletions.

In about 85% of cases, the deletion is due to a random error during the formation of the egg or sperm, or an error in cell division in early fetal development. This is called a de novo deletion. In about 15% of cases, the deletion is caused by a parent having a balanced translocation or from other, rare types of chromosome rearrangements. Although Jacobsen syndrome is typically not inherited, an affected person can pass the deletion on to his/her children.

Last updated on 05-01-20

How might Jacobsen syndrome be treated?

There is no cure for Jacobsen syndrome; treatment generally focuses on the specific signs and symptoms present in each individual. Treatment may require the coordinated efforts of a team of various specialists.

Individuals with low platelet counts (thrombocytopenia) should be monitored regularly. Blood or platelet transfusions may be necessary before or during surgeries. Surgery may be needed to repair various malformations associated with the condition. Complications of certain congenital heart defects (such as rapid heartbeat or fluid accumulation) may be treated with a variety of drugs. Respiratory infections should be treated vigorously and early. Because of the risk of bacterial infection of the heart lining (endocarditis) and valves, those with certain heart defects may need antibiotics before any surgery.

Eye abnormalities may be treated with surgery, glasses, contact lenses, and/or other measures to improve visual problems. Abnormalities of the joints, tendons, muscles, and bones may be treated by orthopedic techniques, potentially in combination with surgery. Physical therapy may help improve coordination and mobility. Early intervention is important to ensure that affected children reach their full potential.

Last updated on 05-01-20

Where To Start

Jacobsen syndrome - resources

Unique - the Rare Chromosome Disorder Support Group - is a source of information and support to families and individuals affected by rare chromosome disorders. Click on the link to view information related to Jacobsen syndrome.

Last updated on 04-27-20

Name: Chromosome Disorder Outreach CDO PO Box 724
Boca Raton, FL, 33429 , United States
Phone: +1-561-395-4252 Email: https://chromodisorder.org/contact/ Url: https://chromodisorder.org/
Name: Unique – Rare Chromosome Disorder Support Group G1, The Stables Station Road West
Surrey RH8 9EE
United Kingdom
Phone: +44 (0)1883 723356 Email: info@rarechromo.org Url: https://www.rarechromo.org/
Name: 11q Research and Resource Group 5155 Shotwell Street
Woodstock, GA, 30188, United States
Email: 11qusa@gmail.com Url: http://www.11qusa.org
Name: European Chromosome 11 Network Belgium Phone: +32 81 31 27 33 87 Email: info@chromosome11.eu Url: http://11q.chromosome11.eu/
Name: March of Dimes 1275 Mamaroneck Avenue
White Plains, NY, 10605, United States
Phone: 914-997-4488 Toll Free: 888-663-4637 Fax : 914-997-4763 Email: http://www.marchofdimes.com/contactus.html Url: http://www.marchofdimes.com/

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