What is the prevalence of Holt Oram Syndrome?

Holt Oram Syndrome is a rare genetic condition with an estimated prevalence of approximately 1 in 100,000 live births. Because Holt Oram Syndrome can present with mild symptoms that go unnoticed, true prevalence is likely higher than current clinical estimates suggest.

What is the prevalence and incidence of Holt Oram Syndrome?

The estimated incidence of Holt Oram Syndrome is approximately 1 in 100,000 live births globally. While it is classified as a rare disease, the actual number of individuals living with Holt Oram Syndrome remains difficult to pinpoint due to the high variability in clinical expression; some individuals may have only minor thumb abnormalities that are never formally diagnosed.

Does Holt Oram Syndrome affect genders or populations differently?

Holt Oram Syndrome affects males and females with equal frequency. There is no evidence of ethnic or geographic predilection for the condition. It is a lifelong, congenital condition, meaning it is present from birth, though cardiac complications associated with Holt Oram Syndrome may not be identified until later in childhood or adulthood depending on their severity.

What challenges exist in gathering accurate data?

Accurate epidemiology for Holt Oram Syndrome is hindered by several factors:

• Underdiagnosis: Milder cases of Holt Oram Syndrome with subtle limb differences may never be referred to a geneticist.


• Misdiagnosis: Overlap with other congenital heart or limb-reduction syndromes can lead to incorrect initial coding in medical records.


• Clinical Variability: Because the severity of heart defects varies, some patients remain asymptomatic for years, escaping detection in population-based studies.

At DiseaseMaps.org, 76 people with Holt Oram Syndrome have already joined our community, providing a vital, real-world perspective that helps supplement limited clinical registry data by sharing lived experiences and diagnostic journeys.

Next steps

• Consult a clinical geneticist to discuss genetic testing (TBX5 gene analysis).


• Request a referral to a pediatric or adult cardiologist for a baseline echocardiogram.


• Connect with the 76 members on DiseaseMaps.org to share resources and experiences.


• Maintain regular follow-ups with specialists even if symptoms appear stable.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• Orphanet: Portal for rare diseases and orphan drugs


• OMIM (Online Mendelian Inheritance in Man): Entry #142900


• National Organization for Rare Disorders (NORD)