Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2019/04 -2022/03
Author : Suzuki Toshimitsu
To understand the pathological mechanism for juvenile myoclonic epilepsy (JME) caused by EFHC1 and CILK1 variants, we investigated whether Efhc1 knockout (Efhc1-KO) mice show increased seizure susceptibility to isoflurane, which has been reported in Cilk1-KO mice. We also carried out the cell counting of inhibitory interneurons in striatum of both Efhc1- and Cilk1-KO mice. Furthermore, we found that myoclonin1, which is encoded by Efhc1, is expressed only in cells with motile cilia but not in neurons in mouse brain or mitotic apparatuses such as mitotic spindle and midbody in dividing cultured cells including mouse neurosphere cells and human embryonic kidney (HEK) cells. We further found that the complete elimination of myoclonin1 in homozygous Efhc1-KO mouse did not critically affect cell division and migration of neurons in cerebral cortex. These results indicate that EFHC1 and CILK1 variant-dependent JME is a motile ciliopathy.