Bardet Biedl Syndrome

National Organization for Rare Disorders, Inc.

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Important
It is possible that the main title of the report Bardet Biedl Syndrome is not the name you expected.

Disorder Subdivisions

  • None

General Discussion

Bardet-Biedl syndrome is a rare, genetic multisystem disorder characterized primarily by deterioration of the cells that receive light stimuli (cone and rod cells), in the retina of the eyes (progressive cone-rod dystrophy), an extra finger near the pinky or an extra toe near the fifth toe (postaxial polydactyly), a condition in which fat is disproportionately distributed on the abdomen and chest rather than the arms and legs (truncal obesity), diminished size and decreased function of the gonads (testes), in males (hypgonadism), kidney (renal), ,abnormalities, and learning difficulties. Visual abnormalities usually become progressively worse and may ultimately result in blindness. Kidney (renal) abnormalities may progress to cause life-threatening complications. Learning difficulties are a common finding due, in part, to vision loss. Only a minority of affected individuals have severe mental impairment. Most cases of Bardet-Biedl syndrome are inherited as an autosomal recessive trait.

Bardet-Biedl syndrome shows significant overlap with a disorder called Laurence-Moon syndrome. In fact, in the past, these disorders were considered the same and referred to as Laurence-Bardet-Biedl syndrome. Eventually, researchers decided that the two disorders despite numerous similarities were distinct entities. However, recent research has demonstrated that some individuals with the clinical findings of Laurence-Moon syndrome have had mutations in genes linked to Bardet-Biedl syndrome. This discovery has led some researchers to suggest that little evidence exists to continue to classify these two disorders as distinct entities.

Supporting Organizations

American Council of the Blind

2200 Wilson Boulevard
Suite 650
Arlington, VA 22201
Tel: (202)467-5081
Fax: (202)465-5085
Tel: (800)424-8666
Email: info@acb.org
Website: http://www.acb.org/

American Foundation for the Blind

2 Penn Plaza
Suite 1102
New York, NY 10121
Tel: (212)502-7600
Fax: (888)545-8331
Tel: (800)232-5463
Email: afbinfo@afb.net
Website: http://www.afb.org

American Printing House for the Blind

1839 Frankfort Avenue
P.O. Box 6085
Louisville, KY 40206-0085
USA
Tel: (502)895-2405
Fax: (502)899-2274
Tel: (800)223-1839
Email: info@aph.org
Website: http://www.aph.org

Foundation Fighting Blindness

7168 Columbia Gateway Drive, Suite 100
Columbia, MD 21046
Tel: (410)423-0600
Fax: (410)872-0574
Tel: (800)683-5555
Email: info@FightBlindness.org
Website: http://www.blindness.org/

Foundation Fighting Blindness (Canada)

890 Yonge Street, 12th Floor
Toronto, Ontario, M4W 3P4
Canada
Tel: 4163604200
Fax: 4163600060
Tel: 8004613331
Email: info@ffb.ca
Website: http://www.ffb.ca

Genetic and Rare Diseases (GARD) Information Center

PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
Website: http://rarediseases.info.nih.gov/GARD/

National Association for Parents of Children with Visual Impairments (NAPVI)

P.O. Box 317
Watertown, MA 02272-0317
Tel: (617)972-7441
Fax: (617)972-7444
Tel: (800)562-6265
Email: napvi@perkins.org
Website: http://www.napvi.org

Perkins School for the Blind

175 North Beacon Street
Watertown, MA 2472
Tel: (617)924-3434
Fax: (617)926-2027
Email: Info@Perkins.org
Website: http://www.Perkins.org

Prevent Blindness America

211 West Wacker Drive
Suite 1700
Chicago, IL 60606
Tel: (312)363-6001
Fax: (312)363-6052
Tel: (800)331-2020
Email: info@preventblindness.org
Website: http://www.preventblindness.org

Retina International

Ausstellungsstrasse 36
CH-8005
Z rich,
Switzerland
Tel: 410444441077
Fax: 410444441070
Email: christina.fasser@retina-international.org
Website: http://www.retina-international.org

Retinitis Pigmentosa International

P.O. Box 900
Woodland Hills, CA 91365
Tel: (818)992-0500
Fax: (818)992-3265
Tel: (800)344-4877
Email: info@rpinternational.org
Website: http://www.rpinternational.org

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). For a full-text version of this report, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report.

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

Last Updated:  8/7/2007
Copyright  2007 National Organization for Rare Disorders, Inc.