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- Title
A compound heterozygous missense mutation and a large deletion in the KCTD7 gene presenting as an opsoclonus-myoclonus ataxia-like syndrome.
- Authors
Blumkin, Lubov; Kivity, Sara; Lev, Dorit; Cohen, Sarit; Shomrat, Ruth; Lerman-Sagie, Tally; Leshinsky-Silver, Esther
- Abstract
Mutations in the potassium channel-related gene KCTD7 were described so far in a single family with progressive myoclonus epilepsy. We describe a unique phenotype: acute onset of myoclonus and ataxia, associated with abnormal opsoclonus-like eye movements; improvement of clinical symptoms under steroid treatment; and appearance of epileptic activity on EEG 2 years later without overt seizures. After excluding possible genetic causes, whole-genome exome sequencing was performed in order to identify the causative gene. One heterozygous missense mutation (R84W) was detected by exome sequencing and a large heterozygous deletion of exons 3 and 4 by MLPA analysis. The father is heterozygous for the R84W mutation and the mother is heterozygous for the exon 3+4 deletion. The mutation affects a highly conserved segment of the predicted protein, changing a basic amino acid into neutral. The large deletion probably results in a truncated protein. The different phenotype broadens the spectrum of KCTD7-related diseases. Therefore, patients diagnosed as having opsoclonus-myoclonus with an atypical course should be evaluated for KCTD7 mutations.
- Subjects
MISSENSE mutation; POTASSIUM channels; MYOCLONUS; ATAXIA; ADRENOCORTICAL hormones; EPILEPSY; DELETION mutation
- Publication
Journal of Neurology, 2012, Vol 259, Issue 12, p2590
- ISSN
0340-5354
- Publication type
Article
- DOI
10.1007/s00415-012-6545-z