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Disease Profile

Spondyloepiphyseal dysplasia tarda X-linked

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

SED; X linked spondyloepiphyseal dysplasia tarda; X-linked spondyloepiphyseal dysplasia


Congenital and Genetic Diseases; Female Reproductive Diseases; Kidney and Urinary Diseases;


X-linked spondyloepiphyseal dysplasia tarda is an inherited skeletal disorder that affects males only. Physical characteristics include moderate short-stature (dwarfism); moderate to severe spinal deformities; barrel-chest; disproportionately short trunk and neck; disproportionately long arms, and premature osteoarthritis, especially in the hip joints. Final male adult height ranges from 4 feet 10 inches to 5 feet 6 inches.[1][2] Other skeletal features of this condition include decreased mobility of the elbow and hip joints, arthritis, and abnormalities of the hip joint which causes the upper leg bones to turn inward. This condition is caused by mutations in the TRAPPC2 gene and is inherited in an X-linked recessive pattern.[2]


This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
Percent of people who have these symptoms is not available through HPO
Joint pain
Barrel-shaped chest
Barrel chest
Coxa vara
Disproportionate short-trunk short stature
Disproportionate short-trunked dwarfism
Disproportionate short-trunked short stature
Short-trunked dwarfism

[ more ]

Hip osteoarthritis
Hump-shaped mound of bone in central and posterior portions of vertebral endplate
Hypoplasia of the capital femoral epiphysis
Small innermost thighbone end part
Underdevelopment of the innermost thighbone end part

[ more ]

Hypoplastic iliac wing
Irregular epiphyses
Irregular end part of long bone
Hunched back
Round back

[ more ]

Limitation of joint mobility
Decreased joint mobility
Decreased mobility of joints
Limited joint mobility
Limited joint motion

[ more ]

Lumbar hyperlordosis
Excessive inward curvature of lower spine
Opacification of the corneal stroma
Flattened vertebrae
Shield chest
Short femoral neck
Short neck of thighbone
Short neck
Decreased length of neck
Spondyloepiphyseal dysplasia
X-linked recessive inheritance


This condition is caused by mutations in the TRAPPC2 gene (sometimes called the SEDL gene), which is located on the X chromosome. The TRAPPC2 gene provides instructions for producing a protein called sedlin. The function of this protein is unclear. Researchers believe that sedlin is part of a larger protein complex, which helps transport proteins between various cell organelles. Mutations in TRAPPC2 affect how the sedlin protein is made, which ultimately affects bone growth.[2]


Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

  • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.


    Many affected individuals require joint replacement surgery (hip, knee, shoulder) or spine surgery (correction of scoliosis or kyphosis). Hip replacement is often required as early as 30 years of age. Chronic pain management is standard and often required before or after surgery. Affected individuals should be regularly followed by a professional familiar with this condition for the development of joint pain and scoliosis.[3]


    Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

    Organizations Supporting this Disease

      Organizations Providing General Support

        Learn more

        These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

        Where to Start

        • Genetics Home Reference (GHR) contains information on Spondyloepiphyseal dysplasia tarda X-linked. This website is maintained by the National Library of Medicine.
        • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.

          In-Depth Information

          • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
          • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
          • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
          • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
          • PubMed is a searchable database of medical literature and lists journal articles that discuss Spondyloepiphyseal dysplasia tarda X-linked. Click on the link to view a sample search on this topic.
          • Medscape Reference has information on spondyloepiphyseal dysplasia in general. You may need to register to view this medical reference, but registration is free.


            1. Tiller GE. Spondyloepiphyseal Dysplasia Tarda. National Organization for Rare Disorders (NORD). December 2010; https://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Spondyloepiphyseal%20Dysplasia%20Tarda. Accessed 5/10/2011.
            2. X-linked spondyloepiphyseal dysplasia tarda. Genetics Home Reference (GHR). June 2008; https://ghr.nlm.nih.gov/condition/x-linked-spondyloepiphyseal-dysplasia-tarda. Accessed 5/10/2011.
            3. Tiller GE, Hannig VL. X-linked spondyloepiphyseal dysplasia tarda. GeneReviews. February 2011; https://www.ncbi.nlm.nih.gov/books/NBK1145/. Accessed 5/10/2011.

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