Epigenetic and transcriptomic alterations in the ClC-3-deficient mice consuming a normal diet

Metabolic disorders are an important health concern that threatens life and burdens society severely. ClC-3 is a member of the chloride voltage-gated channel family, and ClC-3 deletion improved the phenotypes of dysglycemic metabolism and the impairment of insulin sensitivity. However, the effects of a healthy diet on transcriptome and epigenetics in ClC-3 mice were not explained in detail. Here, we performed transcriptome sequencing and Reduced Representation Bisulfite Sequencing for the liver of 3 weeks old WT and ClC-3 mice consuming a normal diet to insight into the epigenetic and transcriptomic alterations of ClC-3 deficient mice. In the present study, we found that ClC-3 mice that were younger than 8 weeks old had smaller bodies compared to ClC-3 mice with ad libitum self-feeding normal diet, and ClC-3 mice that were older than 10 weeks old had a similar body weight. Except for the spleen, lung, and kidney, the average weight of the heart, liver, and brain in ClC-3 mice was lower than that in ClC-3 mice. TG, TC, HDL, and LDL in fasting ClC-3 mice were not significantly different from those in ClC-3 mice. Fasting blood glucose in ClC-3 mice was lower than that in ClC-3 mice; the glucose tolerance test indicated the response to blood glucose increasing for ClC-3 mice was torpid, but the efficiency of lowering blood glucose was much higher once started. Transcriptomic sequencing and reduced representation bisulfite sequencing for the liver of unweaned mice indicated that ClC-3 deletion significantly changed transcriptional expression and DNA methylation levels of glucose metabolism-related genes. A total of 92 genes were intersected between DEGs and DMRs-targeted genes, of which Nos3, Pik3r1, Socs1, and Acly were gathered in type II diabetes mellitus, insulin resistance, and metabolic pathways. Moreover, Pik3r1 and Acly expressions were obviously correlated with DNA methylation levels, not Nos3 and Socs1. However, the transcriptional levels of these four genes were not different between ClC-3 and ClC-3 mice at the age of 12 weeks. ClC-3 influenced the methylated modification to regulate glucose metabolism, of which the gene expressions could be driven to change again by a personalized diet-style intervention.