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PubMed This is a summary of 22 peer-reviewed journal articles Updated
Medical Genetics · Welander Distal Myopathy

Should My Child Be Tested for Welander Distal Myopathy?

At a Glance

Medical guidelines strongly discourage predictive genetic testing for minors with a family history of Welander distal myopathy (WDM) because it is a late-onset condition with no current cure. Adult children can choose to be tested for the TIA1 mutation, but should consult a genetic counselor first.

In this answer

4 sections

01

Testing Minors: The “Right to an Open Future”

02

Testing Adult Children: A Deeply Personal Decision

03

The Crucial Role of Genetic Counseling

04

Important Insurance and Privacy Considerations

Because Welander distal myopathy (WDM) typically has a 50% chance of being passed from parent to child, it is completely natural to wonder if your children should be tested for the TIA1 mutation (the genetic change responsible for the disease) [1]. The medical consensus is that predictive testing (testing a person who currently has no symptoms to see if they carry a genetic mutation that will cause disease later in life) is a deeply personal choice for adult children, but it is generally not recommended for minors [2][3]. Because WDM typically does not start causing symptoms until late adulthood (usually in the late 40s or 50s), testing should only be done voluntarily by adults who have received professional genetic counseling [4][2][1].

Testing Minors: The “Right to an Open Future”

Medical guidelines strongly discourage testing children under 18 for genetic conditions that will not affect them until they are adults [5][6]. WDM is an adult-onset condition, and there are currently no preventative treatments available to stop the disease from developing [7][3].

Delaying testing protects a child’s “right to an open future” [2][6]. This ethical principle ensures that children can grow up to make their own independent decision about whether they want to know their genetic status once they are mature enough to handle the emotional consequences [2][6]. Testing a child early provides no immediate medical benefit and can create unnecessary anxiety or psychological burden [1][3].

Testing Adult Children: A Deeply Personal Decision

Once your children reach adulthood, they have the right to decide whether predictive testing is the right path for them [8][3]. Predictive testing is most straightforward when you, as the affected parent, have already had a genetic test to confirm the specific TIA1 mutation in your family [9][10]. Every individual processes genetic risk differently:

  • The desire to know: Some adults find that knowing their genetic status provides a sense of control, helping them make informed choices about their careers, long-term finances, and family planning (such as exploring options like in vitro fertilization with preimplantation genetic testing to avoid passing the mutation to their own future children) [4][11].
  • The choice not to know: Others prefer to live without this knowledge. A positive result for a condition that cannot currently be cured can lead to significant emotional distress, anxiety about the future, and depression [4][12].

The Crucial Role of Genetic Counseling

No adult should undergo predictive genetic testing for an untreatable, late-onset disease without the guidance of a certified genetic counselor [13][14]. These professionals specialize in helping individuals weigh the emotional, social, and medical implications of their genetic risks.

A counselor will help:

  • You, as the parent, develop a plan for how to communicate this genetic risk to your adult children in a clear and supportive way [13][14].
  • Your adult children understand the inheritance pattern and their actual risk of developing the disease [15].
  • Your adult children explore how a positive or negative result might impact their mental health and their relationships with other family members [13][15].

Important Insurance and Privacy Considerations

Before an adult child decides to get tested, they must consider the practical implications for their privacy and financial future [16]. In the United States, the Genetic Information Nondiscrimination Act (GINA) protects individuals from being denied health insurance or employment based on their genetic test results [17][18].

However, GINA has significant limitations. It does not protect against genetic discrimination when applying for life insurance, disability insurance, or long-term care insurance [19][16][20]. Having a documented TIA1 mutation on their medical record could make it difficult or more expensive for your adult children to obtain these types of coverage in the future [21][22]. Genetic counselors will often discuss these risks in advance, allowing adults to put their insurance policies in place before undergoing any testing [22].

Common questions in this guide

Should children under 18 be tested for Welander distal myopathy?
Medical guidelines strongly discourage testing minors for Welander distal myopathy because it is an adult-onset condition without current preventative treatments. Delaying testing protects a child's right to make their own decision about knowing their genetic status once they reach adulthood.
What is the chance of passing Welander distal myopathy to my child?
There is typically a 50 percent chance that a parent with Welander distal myopathy will pass the responsible TIA1 genetic mutation down to their child.
Should my adult children get predictive genetic testing for WDM?
The decision for adult children to undergo predictive testing is highly personal. It is strongly recommended that they meet with a certified genetic counselor to weigh the emotional, social, and medical impacts before proceeding with any testing.
Can a positive genetic test for WDM affect my child's insurance?
While the Genetic Information Nondiscrimination Act (GINA) protects you from health insurance and employment discrimination based on genetic test results, it has limitations. It does not protect against discrimination when applying for life insurance, disability insurance, or long-term care insurance.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Can you refer my adult children to a certified genetic counselor who has experience with late-onset neuromuscular diseases?
  2. 2.How can I obtain a copy of my own genetic test results so my children can provide accurate information to their genetic counselor?
  3. 3.Are there any emerging clinical trials or preventative treatments currently being studied for asymptomatic carriers of the TIA1 mutation?
  4. 4.If my adult child decides to be tested, what kind of psychological support or resources do you recommend they have in place?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

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References

References (22)
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This page is for informational purposes only and does not replace professional medical advice. Always consult a certified genetic counselor before making decisions about predictive genetic testing for your family.

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