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Limb-girdle muscular dystrophy (CAPN3-related)

Limb-girdle muscular dystrophy (CAPN3-related) refers to a group of disorders that causes muscle weakness. This particular gene change is associated with autosomal recessive limb-girdle muscular dystrophy (LGMDR1), often begins in childhood or the teenage years, however some people with the condition don't begin showing symptoms until as late as age 40.

People with LGMDR1 usually experience weakness in their shoulders, upper arms, pelvic area and thighs, causing changes to their posture and walking, scoliosis (curving of the spine) and joint stiffness. Sometimes, people also need to use a wheelchair.

Quick facts about Limb-girdle muscular dystrophy (CAPN3-related)
Genes: CAPN3
Inheritance: Autosomal Recessive
Alternative Names: LGMD2A, Calpainopathy, Limb-girdle muscular dystrophy type 2A
Relevant resources for Limb-girdle muscular dystrophy (CAPN3-related)

A quick genetics rundown

As humans we have about 23,000 genes. These genes are like tiny instruction manuals that influence our health, growth and development. We inherit half of our genes from our biological mum and the other half from our biological dad. These genes are lined up on structures called chromosomes. Most of us have 23 pairs of chromosomes. The first 22 pairs are called autosomes and for the most part - these are the same among men and women. The 23rd pair determine our sex - two X chromosomes for a female and one X and one Y chromosome for males.

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How is Limb-girdle muscular dystrophy (CAPN3-related) inherited?

Limb-girdle muscular dystrophy (CAPN3-related) is known as an autosomal recessive condition. For autosomal recessive conditions, if a person has a variation in one copy of their gene, they are a carrier. This means that they are healthy because they also have a working copy of the gene. But, they can still pass their non-working copy to their child.

If the other parent also happens to be a carrier of the same gene, there is a 25% (1 in 4) chance that they both pass this gene variation on to their child — and as such, have a child affected by the disease.

If both parents are carriers of Limb-girdle muscular dystrophy (CAPN3-related), there's a one in four chance that their children could develop symptoms.

What is carrier screening?

Carrier testing is like a checkup for your genes. It tests to see if you carry a gene variation that could cause a serious genetic disease in your child. Eugene offers an inclusive genetic carrier screening panel that includes Limb-girdle muscular dystrophy (CAPN3-related), but there's a total 301 conditions that can be tested.

Eugene's carrier test is a clinical grade test that can be done from the comfort of your own home — it's just a saliva test. You're also paired with a genetic counsellor who provides mindful support and guidance every step of the way.

Learn more about carrier screening

Should parents screen for Limb-girdle muscular dystrophy (CAPN3-related) before or early in pregnancy?

The biggest benefit of screening for Limb-girdle muscular dystrophy (CAPN3-related) is that it can help future parents understand their reproductive risk so they can be ready and empowered to make more informed decisions. If neither partner are carriers, it provides reassurance and peace of mind that the risk of having a child with a genetic disease is low.

Since 90% of children that have a recessive genetic disease like Limb-girdle muscular dystrophy (CAPN3-related) had no previous family history of it, it often feels completely out of the blue for the parents. Getting screened is a way to know this risk in advance, which can help familes manage or even prevent the disease in the first place.