Neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-related)

Neuronal ceroid lipofuscinosis (NCL) is a group of related conditions resulting from dysfunction of lysosomes, which are structures in the cell that break down and recycle other molecules. NCLs primarily affect the nervous system and cause worsening problems with vision, movement and thinking ability.

CLN8-related NCL is one of the conditions in the CNLs group. The age of onset and symptoms is variable for CLN8 disease. Some forms of the condition can cause progressive loss of motor skills which causes problems withbalance and coordination (ataxia), jerky muscle contractions (myoclonus), seizures, a loss of developmental abilities (regression), speech delay, and vision loss. Some affected individuals lose the ability to walk and need a wheelchair by late childhood. Other forms cause recurrent seizures and a decline in intellectual function.

CLN8-related NCL can reduce life expectancy and prognosis depends on the severity of symptoms.

Quick facts about neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-related)
Genes: CLN8
Inheritance: Autosomal Recessive
Relevant resources for neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-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 neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-related) inherited?

neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-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 neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-related), 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 neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-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.

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Should parents screen for neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-related) before or early in pregnancy?

The biggest benefit of screening for neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-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 neuronal ceroid-lipofuscinosis/northern epilepsy (CLN8-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.

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