Identification of stiripentol targets
After searching in DrugBank, we retrieved a total of 23 target genes for stiripentol, of which 16 were GABAA receptor subunits, 2 were lactate dehydrogenase and 5 were Cytochrome P450. The targets of stiripentol were shown in Table 1.
Identification of risk genes of Dravet syndrome and Epilepsy
Through literature and database searches, risk genes of Dravet syndrome and epilepsy were obtained, and the results are listed in Supplementary Table 1 and Supplementary Table 2. A total of 19 Dravet syndrome risk genes and 118 epilepsy risk genes have been summarized.
Genetic overlap of stiripentol targets with risk genes of Dravet syndrome and epilepsy
Among 23 target genes of stiripentol, there are 3 overlapping genes of GABAA receptor subunits between the targets of stiripentol and risk genes of Dravet syndrome, which were GABRA1, GABRB3 and GABRG2 genes and its Fisher's exact test P-value was 1.265×10−6; meanwhile, there were 5 genes of GABAA receptor subunits (GABRA1, GABRA2, GABRB2, GABRB3, and GABRG2) overlapped with 118 risk genes of epilepsy. By Fisher's exact test, the total overlap P-value achieved 1.963 × 10−7.
Common brain cell-type enrichment between stiripentol targets and risk genes of Dravet syndrome and epilepsy
To evaluated whether expressions of stiripentol targets and risk genes of Dravet syndrome and epilepsy were significantly enriched in specific brain cell types, we performed EWCE in mouse brain scRNA-seq of Karolinska Institute (KI) dataset and human brain scRNA-seq of the Allen Institute for Brain Science (AIBS) dataset [8,18-20]. For KI dataset, among 24 cell types, stiripentol target genes, risk genes of Dravet syndrome and epilepsy were significantly enriched in six, three and five brain cell types respectively, with P-value < 0.05 and FDR < 0.2 (Figure1, Supplementary Table 3). Among these significant cell types, hippocampal CA1 pyramidal cells, interneurons, and somatosensory pyramidal cells were common brain cell types that were enriched for stiripentol target genes, risk genes of Dravet syndrome and epilepsy. Besides, striatal medium spiny neurons were also common in stiripentol target genes and risk genes of epilepsy. For AIBS dataset, among 6 cell types, stiripentol target genes, risk genes of Dravet syndrome and epilepsy were all significantly enriched in interneurons (GABAergic) and pyramidal neurons (Glutamatergic), with P-value < 0.05 and FDR < 0.2 (Figure2, Supplementary Table 4).
Common pathways between stiripentol targets and risk genes of Dravet syndrome and epilepsy
By pathway enrichment analysis of target genes of stiripentol, risk genes of Dravet syndrome and epilepsy, a total of 44, 23 and 87 pathways were significantly enriched respectively (Supplementary Table 5-7). Among these pathways, we identified 10 significantly pathways that were common between stiripentol targets and risk genes of Dravet syndrome, which were involved in cellular response to histamine, GABAA receptor complex, plasma membrane, chloride channel complex, GABAA receptor activity and extracellular ligand-gated ion channel activity for GO terms, as well as nicotine addiction, GABAergic synapse, morphine addiction and retrograde endocannabinoid signaling for KEGG. Meanwhile, we identified 22 significantly pathways that were common between stiripentol targets and risk genes of epilepsy, which were involved in gamma-aminobutyric acid signaling pathway, ion transmembrane transport, cellular response to histamine, GABAergic synaptic transmission for GO terms, as well as nicotine addiction, GABAergic synapse, morphine addiction, retrograde endocannabinoid signaling and neuroactive ligand-receptor interaction for KEGG (Table2, Supplementary Table 8).