Hkdc1 Conditional Knockout mouse models

Hkdc1 encodes the mouse ortholog of human HKDC1, the fifth hexokinase family member, which retains hexokinase domain architecture but exhibits low glucose-phosphorylating activity and is expressed in liver, gut and placenta rather than in classic glycolytic tissues. Human variants near HKDC1 associate with maternal glucose levels during pregnancy and with gestational glucose handling, and mouse work implicates the protein in hepatic glucose tolerance, lipid handling and association with mitochondria and lipid droplets, suggesting a regulatory rather than high-flux catalytic role. Because the physiology is pregnancy and liver centered, allele choice should match: a whole-body null clarifies gestational glucose phenotypes, a hepatocyte conditional null with Alb-Cre separates liver-autonomous effects from placental contributions, and humanized knockins permit interrogation of specific human coding and noncoding variants. Hk1 and Hk2 supply the bulk of hexokinase activity in most tissues, so avoid total activity assays as a readout. Center endpoints on pregnancy glucose tolerance, hepatic lipid quantification and tracer-based flux.

Tissue restricted knockout of Hkdc1 keeps wild type function everywhere else. Breeding is often more robust, and the setup mirrors patient biology where mutations arise in a subset of cells.