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Ann Child Neurol > Volume 26(2); 2018 > Article
Journal of the Korean Child Neurology Society 2018;26(2):123-127.
DOI: https://doi.org/10.26815/jkcns.2018.26.2.123    Published online June 30, 2018.
CLN6 Mutation in a Patient with Progressive Myoclonus Epilepsy.
Hyun Gyung Lee, Bo Ae Yoon, Young Ok Kim, Myeong Kyu Kim, Young Jong Woo
1Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea. ik052@jnu.ac.kr
2Department of Neurology, Chonnam National University Medical School, Gwangju, Korea.
Neuronal ceroid lipofuscinoses (NCLs) are inherited neurodegenerative disorders, which are caused by the accumulation of lipopigment in lysosomes. Variant forms of late infantile NCLs (vLINCLs) characterized by a later onset of seizures and visual impairment (3–8 years) than in the classic form (2–4 years) are caused by mutations of the gene encoding ceroid lipofuscinosis neuronal protein 6 (CLN6). In a girl with progressive myoclonus epilepsy, we found heterozygous variants of CLN6 (NM_017882.2; NP_060352.1): c.296A>G (p.Lys99Arg) and c.307C>T (p.Arg103Trp). They were identified with whole-exome sequencing and verified with Sanger sequencing. At 7 years and 9 months, our patient had developed multiple types of seizures, prominent myoclonus with photosensitivity, regression in motor and language skills, pyramidal and extrapyramidal signs, and brain atrophy in brain images, all of which were progressive and were compatible with vLINCLs. However, this first Korean report shows no visual impairment, which resembles the previously reported Japanese case.
Key Words: Neuronal ceroid-lipofuscinoses, Progressive myoclonus epilepsy, Regression, Child, Whole-exome sequencing
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