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Mitochondrial DNA (mtDNA) testing can find variants associated with disease and help clarify inherited risk, but it usually cannot say whether a particular person will become ill, when symptoms might start, or how severe they will be. The result needs to be interpreted alongside the exact variant, symptoms, family history, test coverage, and sometimes the tissue tested. A genetic counselor can explain what a result supports—and what it cannot establish.
What an mtDNA result can—and cannot—tell you
Mitochondria have their own DNA. Some inherited changes in mtDNA cause disorders that can affect several organ systems, including energy-demanding tissues such as the brain, muscles, and heart. The conditions and symptoms vary widely. MedlinePlus explains the basics of mitochondrial DNA and its role in health.
Finding a disease-associated variant is meaningful evidence, but it is not a precise forecast. A positive result does not necessarily establish that you will develop disease or predict its timing or severity. A negative result also may not rule out a mitochondrial condition if the test did not detect the relevant variant or type of change. The meaning depends on the test and the specific finding; see MedlinePlus on how genetic test results are interpreted.
Why prediction is difficult
Heteroplasmy can differ between cells and tissues
Cells can contain a mixture of mitochondria with altered and unaltered mtDNA. This mixture is called heteroplasmy. The proportion of altered mtDNA can be associated with disease severity, but it is not a universal stand-alone predictor. The proportion can vary among tissues, so a result from one sample may not represent the level in another tissue.
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Maternal inheritance does not mean identical outcomes
mtDNA is typically passed through the maternal line, but relatives who carry a variant may not have the same symptoms or clinical course. In its discussion of the mtDNA-associated Leigh syndrome spectrum, GeneReviews says that “it is not possible to make specific predictions about clinical outcome in individuals or their offspring.” That statement applies to the condition discussed there; it should not be turned into a single recurrence estimate for every mtDNA variant. The GeneReviews overview of mtDNA-associated Leigh syndrome spectrum describes the inheritance and counseling issues.
Not every mtDNA change is inherited
Some mtDNA changes arise during a person’s life rather than being inherited. MedlinePlus describes somatic mtDNA changes and their association with some age-related conditions. Such associations are not, by themselves, a validated way to calculate an individual’s future disease risk.
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How to interpret a direct-to-consumer result
A direct-to-consumer (DTC) report may give a risk estimate or identify selected variants, but it is not automatically a clinical diagnosis. DTC tests are generally intended to provide information, not to diagnose, prevent, or treat disease, and may not assess every relevant variant or other risk factor. A reported increase in risk is not a guarantee that disease will develop. MedlinePlus explains what DTC genetic test results mean.
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If a consumer report concerns you, discuss it with a healthcare professional or genetic counselor before changing medical care. Ask whether a clinical-grade test is appropriate and whether the result needs to be interpreted in light of symptoms, family history, and the test’s method and sample type. DTC tests do not all use the same methods or examine the same variants.
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- REVIEW IMPORTANT TEST INFO: There is a lot to consider with genetic testing. Before purchasing, review important information about Genetic Health Risk* and Carrier Status* reports at 23andme. org/test-info. A portion of your purchase may be eligible for FSA/HSA reimbursement***.
- UNDERSTAND YOUR GENETIC HEALTH: Get 10+ Condition reports* that show whether you have genetic variants associated with a higher risk of certain conditions. Includes FDA-authorized reports, and you choose whether to view certain reports.
- PLAN AHEAD WITH 45+ CARRIER STATUS REPORTS*: Discover if you carry a genetic variant for inherited conditions across categories like blood, lung, and hearing health, information you can bring to family planning conversations with your healthcare provider.
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Questions to ask a genetic counselor
Bring the report and, if possible, relevant family and health history. These questions can help you understand the finding and decide what follow-up is appropriate:
- What exact mtDNA variant did the test find, and how is it classified?
- Was this a clinical-grade test? What method and sample type were used?
- Which variants, deletions, or levels of heteroplasmy might this test miss?
- Could the amount of the variant differ in other tissues, and would another sample be useful in my situation?
- How do my symptoms and family history affect the interpretation?
- Does this result support a diagnosis, indicate a risk, or remain uncertain?
- What might the result mean for biological relatives or future children, and what cannot be predicted?
- Should any relatives be tested? If so, which relatives and with what test?
- Would evaluation by a mitochondrial disease specialist or another clinician be appropriate?
- If the report says “variant of uncertain significance” or gives only a consumer risk estimate, what should I do next?
A genetic counselor provides information and support to help people understand genetic risks and options. MedlinePlus outlines what genetic counseling involves.
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What a negative result means
A negative finding means the test did not identify the variants it assessed; it does not necessarily exclude every genetic explanation for symptoms or family history. Ask the counselor what the assay covered and whether its limitations, the sample tested, or the possibility of other relevant changes affect how much reassurance the result provides.
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