If you are looking at this site, you or one of your family members has likely recently received a diagnosis of myotonic dystrophy (DM). This news can be overwhelming, and it may take some time for you and your family to adjust. We hope this site will be able to help you navigate the path of myotonic dystrophy; our goal is to provide you with accurate information about DM and share the experiences of other remarkable people who have this disorder.
Note: Medical information available on this site is designed as general information only. Patients should consult with a physician or other qualified medical professionals for advice on medical treatment.
How DM Affects Your Body
Myotonic dystrophy is a very complicated condition. The symptoms and disease progression can vary widely. The effects can be quite different even among members of the same family, so it is difficult to predict just how the disorder will affect you and your family. One person may only have mild muscle pain or cataracts that develop in later years, while someone else with the condition may be born with serious breathing problems.
The most common effects of DM are muscle problems, including muscle weakness (myopathy), trouble relaxing a muscle (myotonia), and muscle wasting that gets worse over time (atrophy). However, it is misleading to think of DM as only a muscle disorder because it also affects many other body functions, including the heart, lungs, and gastrointestinal (GI) system. The disorder can also cause problems with cognitive function, personality, and vision. Not everyone with DM will have all or even most of the possible symptoms.
Myotonic dystrophy is one of the most complex disorders known. In addition to the incredible variability of clinical symptoms the disease also has unique mechanistic features:
- True autosomal inheritance. The disease phenotype of patients who are homozygous for myotonic dystrophy is essentially the same as those who are heterozygous.
- Variable penetrance. Considerable variability is seen between affected individuals, even within the same family. Somatic mosaicism is common, where the genetic defect can be significantly different in various tissues in a single individual and can change over time.
- Anticipation. The disease symptoms tend to be more severe and occur earlier in successive generations.
- Maternal transmission bias for the congenital form. In the most severe form of myotonic dystrophy (congenital myotonic dystrophy: DM1), transmission is nearly always maternal and does not appear to be related to the severity of the disease in the mother. The mutated gene is only very rarely inherited from the father in newborns with myotonic dystrophy.
A Short To Do List for Newly Diagnosed Families
MDF has a comprehensive array of resources available for newly-diagnosed families, available via the Resources link on this website. Below are links to some of our most commonly-requested resources:
- Order an MDF Toolkit
- Join the Myotonic Dystrophy Family Registry
- Download the Anesthesia Guidelines
- Find a local support group near you
- Find a doctor or other DM medical professional near you
- Request support from our professionally-staffed Warmline
- Sign up for emails from MDF
- Register for Research Studies and Clinical Trials
- Obtain Disability Benefits (for U.S. residents only)
Questions? Contact MDF for more information via email or phone (415-800-7777)