Larsen Syndrome

National Organization for Rare Disorders, Inc.

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

Disorder Subdivisions

  • None

General Discussion

Summary
Larsen syndrome is a rare genetic disorder that has been associated with a wide variety of different symptoms. Characteristic findings of the disorder include dislocations of the large joints, skeletal malformations, and distinctive facial and limb features. Additional findings may include abnormal curvature of the spine, clubfoot, short stature, and breathing (respiratory) difficulties. The classic form of Larsen syndrome is caused by mutations of the FLNB gene. The mutation may occur spontaneously or be inherited as an autosomal dominant trait.

Introduction
FLNB-related disorders are a group of disorders (including autosomal dominant Larsen syndrome) that occur due to mutations of the Filamin B gene (FLNB) gene. This group includes atelosteogenesis types I and III, boomerang dysplasia and spondylocarpotarsal syndrome. These disorders are characterized by skeletal abnormalities affecting the bones of the hands and feet, the bones of the spine (vertebrae), joint dislocations, and distinctive facial features. The specific symptoms and severity of these disorders may vary greatly even among members of the same family.

Researchers have identified individuals with multiple joint dislocations and skeletal anomalies whose condition appears to be inherited as an autosomal recessive trait. These individuals often have different radiological findings than those with classic Larsen syndrome. Mutations in the carbohydrate sulfotransferase 3 (CHST3) gene have been identified in patients with so-called autosomal recessive Larsen syndrome that also includes humero-spinal dysostosis and spondyloepiphyseal dysplasia Omani type. Since these disorders are known to be caused by a different gene than classic, autosomal dominant Larsen syndrome, the term autosomal recessive Larsen syndrome should probably be avoided to prevent confusion with clinical disorders resulting from mutations in FLNB.

Resources

MAGIC Foundation
6645 W. North Avenue
Oak Park, IL 60302
Tel: (708)383-0808
Fax: (708)383-0899
Tel: (800)362-4423
Email: mary@magicfoundation.org
Internet: http://www.magicfoundation.org

Children's Craniofacial Association
13140 Coit Road
Suite 517
Dallas, TX 75240
USA
Tel: (214)570-9099
Fax: (214)570-8811
Tel: (800)535-3643
Email: contactCCA@ccakids.com
Internet: http://www.ccakids.com

March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: (914)997-4488
Fax: (914)997-4763
Tel: (888)663-4637
Email: Askus@marchofdimes.com
Internet: http://www.marchofdimes.com

FACES: The National Craniofacial Association
PO Box 11082
Chattanooga, TN 37401
Tel: (423)266-1632
Fax: (423)267-3124
Tel: (800)332-2373
Email: faces@faces-cranio.org
Internet: http://www.faces-cranio.org

NIH/National Institute of Arthritis and Musculoskeletal and Skin Diseases
Information Clearinghouse
One AMS Circle
Bethesda, MD 20892-3675
USA
Tel: (301)495-4484
Fax: (301)718-6366
Tel: (877)226-4267
TDD: (301)565-2966
Email: NIAMSinfo@mail.nih.gov
Internet: http://www.niams.nih.gov/

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
TDD: (888)205-3223
Internet: http://rarediseases.info.nih.gov/GARD/

Cleft Lip and Palate Foundation of Smiles
2044 Michael Ave SW
Wyoming, MI 49509
Tel: (616)329-1335
Email: Rachelmancuso09@comcast.net
Internet: http://www.cleftsmile.org

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, 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. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

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.

For additional information and assistance about rare disorders, please contact the National Organization for Rare Disorders at P.O. Box 1968, Danbury, CT 06813-1968; phone (203) 744-0100; web site www.rarediseases.org or email orphan@rarediseases.org

Last Updated:  6/5/2012
Copyright  1988, 1990, 1992, 1999, 2001, 2003, 2008, 2012 National Organization for Rare Disorders, Inc.

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