Is Spondyloepiphyseal Dysplasia Tarda hereditary?

Spondyloepiphyseal dysplasia tarda (SEDT) is an inherited genetic condition primarily caused by mutations in the TRAPPC2 gene. It follows an X-linked recessive inheritance pattern, meaning it is passed from parents to children through genetic material rather than occurring randomly.

Is Spondyloepiphyseal Dysplasia Tarda hereditary?

Yes, Spondyloepiphyseal dysplasia tarda is a hereditary condition, meaning it is caused by a genetic mutation passed down through families. While "genetic" simply means the condition is linked to a gene, "hereditary" confirms it is inherited from one or both parents. In Spondyloepiphyseal dysplasia tarda, the condition is specifically X-linked recessive, which explains why it is significantly more common and severe in males than in females.

How is Spondyloepiphyseal Dysplasia Tarda inherited?

The inheritance of Spondyloepiphyseal dysplasia tarda is X-linked recessive. Because the TRAPPC2 gene is located on the X chromosome, the inheritance risks for children of an affected parent are as follows:

• Affected males: All daughters will be carriers, and none of his sons will inherit the condition (as they receive his Y chromosome).


• Carrier females: There is a 50% chance for each son to inherit the condition and a 50% chance for each daughter to be a carrier.

While de novo (spontaneous) mutations can occur in some genetic disorders, Spondyloepiphyseal dysplasia tarda is most frequently inherited from a carrier mother or an affected father, though sporadic cases do exist due to new mutations in the gene.

Is genetic testing available for Spondyloepiphyseal Dysplasia Tarda?

Genetic testing is available and is the gold standard for confirming a diagnosis of Spondyloepiphyseal dysplasia tarda. Molecular testing of the TRAPPC2 gene is recommended if clinical and radiographic findings suggest the condition. Because Spondyloepiphyseal dysplasia tarda can be difficult to distinguish from other skeletal dysplasias, genetic counseling is vital for families to understand their specific risks, discuss carrier testing for relatives, and explore reproductive options like prenatal diagnosis or preimplantation genetic testing (PGT).

Next steps

• Consult with a clinical geneticist to confirm a diagnosis via TRAPPC2 gene sequencing.


• Speak with a genetic counselor to map family inheritance patterns and discuss family planning.


• Connect with the 11 community members on DiseaseMaps.org who have shared their experiences with Spondyloepiphyseal dysplasia tarda.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Spondyloepiphyseal dysplasia tarda.


• Online Mendelian Inheritance in Man (OMIM): Entry #313000 (Spondyloepiphyseal dysplasia tarda).


• Orphanet: Spondyloepiphyseal dysplasia, X-linked (ORPHA:2516).