I am 19 years old, pregnant with my first child. My moms biological mother was a carrier of MD, & had a son who had MD since born, and passed away at 36 y/o. My moms biological grandmother was also a carrier and had a son with MD who is still alive. My mom was told her chances of being a carrier were about 50/50, they were unable to get any bloodwork/info from her biological father because he left when she wasa few months old, never came back. My moms half sister was told she'd have a 3% chance of being a carrier of MD. She had 4 children and they all came out healthy. My mom had two sons and myself who came out "healthy".... I was told that the more the DNA is mixed, that it gets more diminished.? My question is, what do you think my chances are of being a carrier, knowing my mom and her sis were not carriers? Do you think it skips generations? I am going in for genetic counseling and probably an amniocentesis, but that won't be until a few more weeks. Could Anyone please help me out with facts/answers/anything? It is greatly appreciated!

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DMD is carried by an X-linked recessive gene. Males have only one X chromosome, so one copy of the mutated gene will cause DMD. Fathers cannot pass X-linked traits on to their sons, so the mutation is transmitted by the mother. If the mother is a carrier, and therefore one of her two X chromosomes has a DMD mutation, there is a 50% chance that a female child will inherit that mutation as one of her two X chromosomes, and be a carrier. There is a 50% chance that a male child will inherit that mutation as his one X chromosome, and therefore have DMD. So unfortunately, even though your mom and aunt did not have any sons with dmd it is possible that they were carriers. They mixing of DNA does not matter. They should be able to test you to see if you are a carrier. Who was the mother of the half-sister? How old is the son of your biological grandmother? Did he or the son of your bio mother have genetic testing? It might be that it is not duchenne MD but Beckers or another type of MD. In my family my grandmother was the carrier and had one son with DMD. 3 of her daughters were carriers for sure. One aunt had 2 boys and three girls and one son had DMD. The other aunt had eight kids 4 of each and only one boy with dmd and none of my female cousins are carriers but the other daughters did not have kids so we don't know about them. My other aunt only had 2 kids one boy who did not have dmd and one girl who never had children out of fear of it. So then my Mom only had me and I have 2 sons with DMD. So it is very hard to tell without the genetic testing if you are a carrier and even what type if in your family. I know how scary this is for you. Try not to freak out. There is still a good chance you are not a carrier. And if you are it sounds like a mild type like what is in my family. My oldest is 16 walking great and still doing great. Let me know if there is anything else I can tell you.  Eileen

Thank you. I know that only the females are the carriers, & males are the ones to get it. My aunt had the same biological mother as my mom did. & I am unsure how old my moms uncle is that has MD he must be around 60 or so. But my uncle who had it, had a really bad case, & started using a wheelchair at 4 years old. In a few weeks, a specialist will take a sample of the amniotic fluid to test the baby. My thought is that it skips generations. I've been trying to stay calm, but it is kind of scary. My uncle was limited to so many things in life & they told him he'd live to about 20 y/o, them kept living, they said the latest would be 35, once he reached 35, he celebrated that he was still alive but sadly passed a year later.

No it sadly does not skip, its just the luck of the draw. I wish I had know before I had my boys but I don't know if it really would have changed anything. I love my boys so much and they are super smart and awsome and I can imagine life without them. My uncle and my cousins also were told they would have short lives but all ended up living to late 30s and mid 40s.

They were also in wheelchairs by 9-12 but there are treatments now and so much emerging science. My boys are on a steriod called Deflazacort which they both started around 6 years ago. My aunts are just amazed at how well they are doing.

It is very scary. I am so sorry you have to go through this. I hope it is a girl and/or you are not a carrier. But at least you will know for sure. Let us know how it works out. This group is so supportive.

Take care.

Ditto on everything eilene has said.

Since all you know for certain right now is that your grandmother was a carrier, you have a 25% chance of being a carrier. You have a 1 in 32 chance of having a boy with b/dmd, or about 3%. That's how I understand the genetics. You should talk with a genetics counselor. You need a specific DNA test to determine if your child has it. A standard amnio will not tell you.

Good luck.
Eileen, thank you for your help. I believe at first they thought my uncle had DMD, but then turned out it was beckers. He was always so positive in life and has left a huge impact in my life. I'm staying calm, stress is bad for the baby. My hope is all in Gods hands at this point.

And thank you sir, I hope it's just a small percent like that. I will find out in about 3 weeks and will keep you guys informed.

Any other questions on testing please dont hesitate to contact our Genetic Counselor, Ann Martin! She can help with any question. ann@parentprojectmd.org 

I just wanted to wish you good luck, DMD is not the end of the world although it is a terrible disease, both my boys were diagnosed recently they are 2 and 3 years old. Hoping with all my heart that your son does not have it, but if he has it you have found a great support group here! :)

Thank you everybody for all of your support and kind words.
Just wanted to inform You all that I had my first meeting with the genetic councelar today. I was told by the looks of it, I would have a 25% chance of being a carrier. If I do happen to be a carrier & had a son, then he would have a 12.5% chance of actually having MD. He said if I want to know for sure then obviously I would have to get further testing done, but at least I was able to get some info. Still a bit anxious!

Better double check that.  If you're a carrier and have a son - you have a 50% chance of him having MD.  

http://www.parentprojectmd.org/site/DocServer/filename?docID=102

"About two thirds of Duchenne boys inherit the disease because their mother is a genetic carrier. At the meiosis, the cell division leading to the egg cells, each egg cell receives only one X chromosome. The probability that it is the X chromosome with the gene mutation is 50 %. Therefore on average 50 % of her sons will have Duchenne muscular dystrophy and on average 50 % of her daughters will also be carriers."

Even if it's Beckers? That's what runs in my family. I guess it's just a big waiting test lol.

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