Desipramine reverses remote memory deficits by activating calmodulin-CaMKII pathway in a UTX knockout mouse model of Kabuki syndrome

Background Kabuki syndrome (KS) is a rare developmental disorder characterised by multiple congenital anomalies and intellectual disability. UTX (ubiquitously transcribed tetratricopeptide repeat, X chromosome), which encodes a histone demethylase, is one of the two major pathogenic risk genes for KS. Although intellectual disability is a key phenotype of KS, the role of UTX in cognitive function remains unclear. Currently, no targeted therapies are available for KS. Aims This study aimed to investigate how UTX regulates cognition, to explore the mechanisms underlying UTX dysfunction and to identify potential molecular targets for treatment. Methods We generated UTX conditional knockout mice and found that UTX deletion downregulated calmodulin transcription by disrupting H3K27me3 (trimethylated histone H3 at lysine 27) demethylation. Results UTX-knockout mice showed decreased phosphorylation of calcium / calmodulin-dependent protein kinase II, impaired long-term potentiation and deficit in remote contextual fear memory. These effects were reversed by an Food and Drug Administration-approved drug desipramine. Conclusions Our results reveal an epigenetic mechanism underlying the important role of UTX in synaptic plasticity and cognitive function, and suggest that desipramine could be a potential treatment for KS.