Are Myelodysplastic Syndromes hereditary?

Most cases of Myelodysplastic Syndromes are not hereditary, as they arise from acquired (somatic) genetic mutations that occur during a person's lifetime rather than being inherited from parents. While the vast majority of Myelodysplastic Syndromes are sporadic, a very small subset of patients may have a rare, underlying hereditary predisposition to bone marrow failure, which requires specialized clinical genetic evaluation.

Are Myelodysplastic Syndromes hereditary?

In clinical practice, we distinguish between "genetic" and "hereditary." Myelodysplastic Syndromes are always "genetic" because they are driven by mutations in the DNA of blood-forming cells. However, they are rarely "hereditary," meaning they are not typically passed down from parent to child. Most Myelodysplastic Syndromes are caused by de novo (spontaneous) mutations acquired in the bone marrow due to aging, environmental factors, or prior medical treatments like chemotherapy.

When is genetic testing recommended for Myelodysplastic Syndromes?

While most Myelodysplastic Syndromes occur spontaneously, genetic testing is recommended if there is a clinical suspicion of a familial predisposition syndrome. Indications often include:

• Onset of Myelodysplastic Syndromes at a young age (typically under 40-50 years).


• A strong personal or family history of bone marrow failure, hematologic malignancies, or immune deficiencies.


• Physical features or medical history suggestive of specific syndromes like GATA2 deficiency, Fanconi anemia, or telomere biology disorders.

What is the role of genetic counseling?

For families concerned about inherited risks, genetic counseling is essential. A counselor can help determine if the Myelodysplastic Syndromes are truly sporadic or if there is a germline mutation present in every cell of the body. If a germline mutation is identified, the risk to children could be as high as 50% (autosomal dominant inheritance), though this is rare and specific to the identified gene.

Next steps

• Consult with a hematologist-oncologist to discuss if your specific case warrants germline genetic testing.


• If a hereditary link is suspected, request a referral to a clinical geneticist who specializes in hematologic disorders.


• Connect with the 36 members of the DiseaseMaps community who have experience navigating the complexities of Myelodysplastic Syndromes.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Myelodysplastic syndromes.


• Orphanet: Rare myelodysplastic syndromes.


• OMIM (Online Mendelian Inheritance in Man): Clinical synopsis of familial predisposition to MDS.


• The Myelodysplastic Syndromes Foundation: Clinical guidelines and patient resources.