Journal
AMERICAN JOURNAL OF MEDICAL GENETICS PART A
Volume 185, Issue 11, Pages 3384-3389Publisher
WILEY
DOI: 10.1002/ajmg.a.62455
Keywords
developmental and epileptic encephalopathy; KCNC2; recurrent de novo variant; whole exome sequencing
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Funding
- Polish Ministry of Science and Higher Education
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Developmental and epileptic encephalopathies (DEE) are characterized by epilepsy and intellectual/developmental disability. Despite many known DEE-related genes, cases without molecular diagnosis still exist. In this case, a new KCNC2 mutation was identified in a patient with DEE, expanding the understanding of DEE genetics.
Developmental and epileptic encephalopathies (DEE) are a heterogenous group of conditions characterized by the co-occurrence of epilepsy and intellectual/developmental disability. Despite several known DEE-related genes, including these encoding ion channels, still many cases remain without molecular diagnosis. Here, we present a 2-year-old girl with severe DEE in whom whole exome sequencing revealed de novo p.(Val471Leu) variant in the KCNC2 encoding Kv3.2, a voltage-gated potassium channel. To the best of our knowledge, this is the third DEE case due to KCNC2 mutation. Our clinical and molecular findings, particularly the recurrence of p.(Val471Leu) in patient with similar clinical phenotype, further support KCNC2 as a novel DEE-associated gene.
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