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• W2808164064 abstract "Infantile spasms (IS) is a catastrophic childhood seizure disorder that is characterized by extensor and/or flexor spasms, cognitive deterioration and a characteristic EEG abnormality. The latter consists of a pattern of a spike-wave followed by an electrodecremental response (EDR), which is a flattening of the EEG waveform amplitude. The mechanism/circuitry that underpins IS is unknown. Children with Down Syndrome (DS) are particularly vulnerable to IS. The standard mouse model of DS is the Ts65Dn mutant mouse (Ts). Using the Ts mouse, we have created an animal model of IS in DS. This model entails the treatment of Ts mice with a GABABR agonist with a resultant recapitulation of the semiological, electrographic, and pharmacological phenotype of IS. One of the genes triplicated in Ts mice is the kcnj6 gene which codes for the G-protein inwardly rectifying potassium channel 2 (GIRK2) protein. We have shown that over expression of GIRK2 in Ts brain is necessary for the production of the GABABR agonist induced IS phenotype in the Ts mouse. Here, we ask the question whether the excess GIRK2 is sufficient for the production of the GABABR agonist induced IS phenotype. To address this question, we used kcnj6 triploid mice, and compared the number of spasms via video analysis and EDR events via EEG to that of the WT mice. We now show that GABARR agonist-treated kcnj6 triploid mice failed to show susceptibility to the IS phenotype. Therefore, over expression of GIRK2 in the brain is necessary, but not sufficient to confer susceptibility to the GABABR agonist-induced IS phenotype in the Ts model of DS. It is therefore likely that GIRK2 is working in concert with another factor or factors that are altered in the Ts brain in the production of the GABABR agonist-induced IS phenotype." @default.
• W2808164064 created "2018-06-21" @default.
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• W2808164064 date "2018-09-01" @default.
• W2808164064 modified "2023-09-27" @default.
• W2808164064 title "Kcnj6 (GIRK2) trisomy is not sufficient for conferring the susceptibility to infantile spasms seen in the Ts65Dn mouse model of down syndrome" @default.
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• W2808164064 doi "https://doi.org/10.1016/j.eplepsyres.2018.06.006" @default.
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