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A genetic finding may help explain a motor neurone disease (MND) diagnosis and inform conversations with relatives, but it is not a diagnosis by itself or a prediction of what will happen. Its meaning depends on the exact gene, the specific variant and its clinical classification. An MND clinician and genetic counsellor can help interpret the result and discuss next steps.
What does a genetic finding for MND mean?
“Genetic hit” is informal wording for a genetic test finding. After a clinical diagnosis, diagnostic genetic testing looks for known gene changes associated with MND. A result may identify a change that helps explain the condition, but not every result is clear, and not every family with inherited MND has a known cause identified by testing.
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A genetic result is interpreted alongside the person’s clinical picture and family history. The gene name alone is not enough: the exact variant and its classification matter. Without the clinical report, it is not possible to say what a particular finding means or whether it is considered disease-causing.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The Motor Neurone Disease Association says that up to 1 in 10 people with MND have inherited MND, referring to cases where there is a family history. It also reports that known changed genes account for around 70% of inherited or familial cases. That estimate describes known causes in familial MND; it is not a measure of how accurately a test will explain an individual’s result. Motor Neurone Disease Association: Inherited MND
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What can the test tell you—and what can’t it tell you?
- It may identify a known MND-associated genetic change. For someone diagnosed with MND, this may help explain the condition and guide discussion about relatives or relevant research opportunities.
- It may not identify a known cause. A negative result does not prove that genetics played no role, and a test result may be uncertain.
- It does not, on its own, diagnose MND or predict its course. Diagnosis and prognosis require clinical assessment; a genetic finding alone cannot establish what symptoms a person will develop or when.
- It cannot predict whether or when an unaffected carrier will develop MND. A changed gene can increase risk without making disease certain. The MND Association puts it plainly: “Having a changed gene creates a higher risk of developing the condition, but it does not mean you will definitely get MND.”
The exact test and pathway depend on location. In England, the NHS Genomics Education Programme says people with confirmed MND are eligible for genomic testing under its criteria. Its guidance describes an early-onset ALS panel using whole-genome sequencing with analysis limited to genes known to cause adult-onset neurodegenerative conditions, alongside short tandem repeat testing that includes C9orf72. Clinicians should check the live NHS Genomics Education Programme guidance and National Genomic Test Directory when ordering, since test information can change. Testing arrangements differ in Wales, Scotland and Northern Ireland.
Diagnostic and predictive testing are different
| Type of testing | Who it is for | What it can address |
|---|---|---|
| Diagnostic | A person who has already been diagnosed with ALS/MND | Whether a known MND-associated genetic change may be linked to their condition. The result may also have implications for biological relatives. |
| Predictive | An unaffected relative when a known genetic change has already been identified in the family | Whether the relative inherited that family change. It cannot tell whether or when an unaffected carrier will develop MND. |
As the International Alliance of ALS/MND Associations explains, “Predictive testing is for a family member who does not have ALS/MND but who may be at risk because a known genetic change has been identified in their family.” Predictive testing is not the same as screening someone without a known family change.
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Genetic counselling helps people understand the limits and possible implications of testing, consider family circumstances and decide whether testing is right for them. Counselling does not obligate anyone to proceed. The MND Association says counselling is essential before predictive testing; the Alliance says it is usually offered before and after. Discuss the available route with a clinician, since access and arrangements vary by location. International Alliance of ALS/MND Associations: Genetic Counselling & Testing
Which genes are associated with inherited MND?
The MND Association lists C9ORF72, SOD1, TARDBP (also known as TDP-43) and FUS among the more commonly reported genes linked to inherited MND. Its 2025 figures are approximate shares reported by the Association, not an individual’s probability or a universal breakdown:
| Gene | Share reported by the MND Association |
|---|---|
| C9ORF72 | Around 4 in 10 cases |
| SOD1 | 2 in 10 cases |
| TARDBP | Up to 5 in 100 cases |
| FUS | Up to 5 in 100 cases |
The Association’s page also notes that other rare genes are implicated. These percentages are attributed estimates, and figures from different organisations may use different definitions or evidence periods; they should not be added together or treated as personal risk estimates. Motor Neurone Disease Association: Genes linked to inherited MND
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Could other family members be at risk?
A confirmed genetic change may be relevant to biological relatives, but what it means for them depends on the specific variant and family context. Family history does not mean a relative will definitely develop MND. If a known family change has been identified, relatives can discuss predictive testing with a genetic counsellor; if there is no known change, predictive testing cannot simply determine an unaffected person’s future.
Questions such as “Will my children get MND?” are understandable, but cannot be answered from the gene name or family history alone. NICE advises that information about diagnosis, prognosis and management should come from a consultant neurologist with up-to-date expertise in MND. It also recommends asking how much information the person wants and what role they want family members to have in discussions. NICE guideline: Motor neurone disease—assessment and management
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What to do with a result
- Ask for the clinical report. Confirm the gene, exact variant and classification recorded by the laboratory; do not infer these from a brief description such as “genetic hit.”
- Discuss it with the MND team. Ask how the finding relates to the clinical diagnosis and whether the result is clear, uncertain or does not identify a known cause.
- Ask about genetics support. A genetic counsellor can explain implications for relatives and what predictive testing can and cannot answer.
- Check the local pathway. If you are in England, genomic testing eligibility and panel details should be checked against current NHS guidance and the National Genomic Test Directory. The England pathway should not be assumed to apply elsewhere in the UK.
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