RPGRIP1L-related disorders

RPGRIP1L-related disorders (RRD) are a group of disorders which affect many parts of the body, including the brain, breathing, muscle tone, vision, intellect, the liver and kidneys and co-ordination and movement.

Joubert syndrome 7, COACH syndrome and Meckel syndrome 5 are the three conditions associated with RRD. People with Joubert syndrome usually have brain abnormalities, developmental delay and intellectual disability. Those with Meckel syndrome often have enlarged kidneys and abnormalities of the brain. COACH syndrome is also associated with brain abnormalities, liver problems and intellectual disability.

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

Quick facts about RPGRIP1L-related disorders
Genes: RPGRIP1L
Inheritance: Autosomal Recessive
Relevant resources for RPGRIP1L-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 RPGRIP1L-related disorders inherited?

RPGRIP1L-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 RPGRIP1L-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 RPGRIP1L-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 RPGRIP1L-related disorders before or early in pregnancy?

The biggest benefit of screening for RPGRIP1L-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 RPGRIP1L-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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