MKS1-related disorders

MKS1-related disorders (MKSDs) are a group of disorders which affect many organs of the body, including the eyes, kidneys, liver and brain.

Joubert syndrome, Bardet-Biedl syndrome and Meckel syndrome are the three conditions associated with MKS1-related disorders. People with Joubert syndrome usually have brain abnormalities, weak muscle tone, developmental delay and intellectual disability. Those with Bardet-Biedl syndrome often develop vision loss that worsens over time, intellectual disability, serious kidney problems and abnormalities of the genitals. Meckel syndrome is the most serious of these conditions and is associated with large kidneys and brain abnormalities that often cause death soon after birth.

Treatment can often help with quality of life for all types of MKSDs, however often this condition is life limiting.

Quick facts about MKS1-related disorders
Genes: MKS1
Inheritance: Autosomal Recessive
Alternative Names: MKSDs
Relevant resources for MKS1-related disorders

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 MKS1-related disorders inherited?

MKS1-related disorders 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 MKS1-related disorders, there’s a one in four chance that their children could develop symptoms.
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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 MKS1-related disorders, 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.

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Should parents screen for MKS1-related disorders before or early in pregnancy?

The biggest benefit of screening for MKS1-related disorders 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 MKS1-related disorders 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.

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