CLN2, apart from CLN7, was also found to be a common type in the Russian population.14 CLN1 usually presents under two years of age, with some studies showing late-onset variants and our two patients of CLN1 also presented in early infancy.9 All the patients with mutations in genes including TPP1/CLN2, CLN3, CLN5 and CLN8 presented with a late infantile NCL phenotype in our study population.15 Most of them presented with speech delay, seizures and motor decline along with progressive loss of vision. The gene discussed is PPT1; the disease is neuronal ceroid lipofuscinosis.