What this study looked at
CLN2 disease (a form of Batten disease) usually appears in early childhood, but a minority of children have an atypical, non-classic form that is harder to spot. Experts across Latin America pooled clinical and genetic data on children with atypical CLN2 — the largest such cohort reported — to map how these cases present.
Key takeaways
- First symptoms — seizures, language abnormalities and behavioural problems — appeared at a median age of about six years, older than in classic late-infantile CLN2.
- The later onset and slower progression make atypical CLN2 easy to miss or to diagnose late.
- The study identified three previously unreported TPP1 mutations.
Why it matters
Children with later, milder presentations can still benefit from early treatment — but only if clinicians keep CLN2 in mind when a child has seizures together with behavioural and language problems.
