Is Diastrophic Dysplasia hereditary?

Diastrophic dysplasia is an inherited genetic condition caused by mutations in the SLC26A2 gene, which follows an autosomal recessive inheritance pattern. This means that for a child to be born with diastrophic dysplasia, they must inherit one mutated copy of the gene from each parent, who are typically asymptomatic carriers.

Is diastrophic dysplasia hereditary?

Yes, diastrophic dysplasia is strictly a hereditary condition. In clinical genetics, we distinguish between "genetic" (caused by DNA changes) and "hereditary" (passed from parents to offspring). Because it is autosomal recessive, the disease is passed down through generations even if no symptoms are present in the parents. De novo or spontaneous mutations are extremely rare in diastrophic dysplasia; the vast majority of cases arise from carrier parents.

What is the risk of recurrence for parents?

When both parents are carriers of an SLC26A2 mutation, the following probabilities apply for each pregnancy:

• 25% chance the child will have diastrophic dysplasia.


• 50% chance the child will be an asymptomatic carrier.


• 25% chance the child will not inherit any mutation.

How is genetic testing and counseling utilized?

Molecular genetic testing for diastrophic dysplasia is widely available and involves sequencing the SLC26A2 gene to identify pathogenic variants. Genetic counseling is highly recommended for families planning a pregnancy or those who have received a diagnosis. Counselors help families understand their carrier status, interpret test results, and explore reproductive options such as preimplantation genetic testing (PGT) or prenatal diagnosis via chorionic villus sampling (CVS) or amniocentesis.

Next steps

• Consult with a clinical geneticist to confirm the diagnosis through molecular testing.


• Connect with others who have diastrophic dysplasia on DiseaseMaps.org to share experiences and find support.


• Request a referral to a genetic counselor to discuss family planning and recurrence risks.


• Visit the NIH GARD website for updated clinical trials and research registries.

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

References

• NIH Genetic and Rare Diseases Information Center (GARD): Diastrophic Dysplasia


• Orphanet: Diastrophic Dysplasia (ORPHA:248)


• OMIM (Online Mendelian Inheritance in Man): Diastrophic Dysplasia (#222600)


• Little People of America (LPA): Medical information on skeletal dysplasias