What Is Batten Disease? A Rare Diagnosis Every Parent Should Know About

Tiny Hearts

This one is for Sonny.

Sonny is a little boy who loves the moon, music, dancing and orange cats. He was two years old when his family got an answer they were never prepared to hear.

It started with seizures. Then his speech began to slip away. Then his balance, then his coordination. In May, after months of appointments and tests and waiting, Sonny was diagnosed with CLN2 Batten disease.

Most parents have never heard of it. Sonny's parents, Sarah and Jase, hadn't either.

We wanted to write this because rare doesn't mean it doesn't happen. It happens to real families, in real suburbs, in the middle of ordinary weeks. And the more parents who know the early signs, the more little ones get answers sooner.

What Batten disease actually is

Batten disease is the everyday name for a group of rare, inherited conditions called the neuronal ceroid lipofuscinoses, or NCLs.

Here's what's happening underneath. Every cell in the body has a recycling system that clears out waste. In Batten disease, one of the enzymes that runs that system is missing or doesn't work properly. Waste builds up inside cells instead of being cleared, and the cells most affected are the ones in the brain and the eyes.

Because the cells can't clear the waste, they gradually stop working. That's why the condition affects the things the brain controls: speech, movement, vision, memory, seizures.

There are around 14 known types, each caused by a different gene and each numbered CLN1 through to CLN14. The type determines the age it usually appears and how it progresses.

Sonny has CLN2.

How a child inherits it

This is the part that surprises most parents.

Batten disease is almost always what's called autosomal recessive. That means a little one has to inherit a copy of the faulty gene from both parents to develop the condition.

Carriers have no symptoms. No signs, no health problems, no reason to ever know. Most parents find out they're carriers only after their child is diagnosed.

When both parents carry it, there's a one in four chance with each pregnancy that their little one will have the condition.

Nobody causes this. There is nothing a parent did, or ate, or missed, or should have known.

The early signs of CLN2

CLN2 usually shows up between the ages of two and four, in a little one who has been developing typically until then.

The pattern doctors look for is this. Often the first thing families notice, sometimes only looking back, is that language has been slower to come than expected. Then seizures begin, frequently the very first thing that sends a family to hospital.

Signs that tend to build over time

Seizures, often more than one type, and often hard to control with medication
Loss of words and language a little one already had
Wobbliness, unsteady walking, frequent falls
Loss of skills they'd already mastered, like feeding themselves or climbing stairs
Jerky, involuntary movements
Vision changes, usually later on

The signal that matters most is regression. Not a little one who is slow to reach a milestone, but a little one who reaches it, has it, and then loses it.

Now the important context. Speech delay in toddlers is incredibly common, and it is almost never caused by anything like this. Most little ones who are slow to talk are simply little ones who are slow to talk. A single febrile seizure is also common and usually harmless.

It's the combination that's worth flagging with your GP. Language that didn't come as expected, plus seizures, plus skills going backwards.

Why diagnosis so often takes too long

Families with CLN2 frequently spend a year or more without an answer, and it isn't because anyone isn't trying.

Seizures in toddlers are common. Speech delay is common. Wobbliness is common. Each symptom on its own has a dozen ordinary explanations, and the ordinary explanations get ruled out first, one at a time, appointment after appointment.

Standard tests don't always pick it up either. An EEG and an MRI can both look unremarkable in the early stages. Confirming CLN2 takes a specific enzyme activity test alongside genetic testing, and nobody orders those tests until someone thinks to look.

That's the gap. And it's the gap parents can close.

If something feels off, keep asking

You know your little one better than anyone in the room. You've watched them every day of their life. You notice the shift that doesn't show up on a chart.

Use the word "losing". If your little one is losing skills they used to have, say those exact words. Not "he's behind" but "he could do this, and now he can't."

Keep a record. Write down what changed, and when. Small details you think are irrelevant often turn out to be the ones that matter.

Take a video. A thirty second clip on your phone of what you're seeing is worth more than any description you can give in a ten minute appointment.

Ask again. If you leave feeling unheard, you're allowed to go back. You're allowed to ask for a paediatric referral. You're allowed to seek a second opinion.

That isn't being difficult. It's advocacy, and it's one of the most important things a parent ever does.

What treatment exists

There is currently no cure for any form of Batten disease.

For CLN2 specifically, there is one approved treatment, an enzyme replacement therapy called cerliponase alfa, sold as Brineura. It replaces the enzyme the body can't make. It doesn't reverse damage already done, but it has been shown to slow the loss of language and movement.

It's given as an infusion directly into the brain, once every two weeks, for life. It means a surgically placed port, regular hospital admissions, and a family calendar built around it.

Research into gene therapy for several types of Batten disease is ongoing. For families living it now, every study matters.

Where families can find support

Batten Disease Support and Research Association Australia (BDSRA Australia) supports Australian families living with Batten disease, funds research, and connects families to each other.

If your family is walking this road, you don't have to walk it alone.

Visit BDSRA Australia

How you can help Sonny

Sonny's family are living this every single day. The appointments, the equipment, the therapies, the travel, the constant recalibrating of what life looks like now.

His fundraiser goes towards his medical care, his therapies, the equipment he needs, and giving Sarah and Jase the ability to step back from work and simply be his parents.

Donate to Sonny's fundraiser

Every share matters. Every dollar matters. And every parent who reads this and learns the name of the thing. That matters too.