Type 2 DM :
-< 5% monogenic defect : glucokinase, insulin receptor, K-ATP channel, mitochondrial DNA
-Large majority polygenic defects & dysregulation of metabolism in response to chronic hyperglycaemia & dyslipidemia.
Glucose intolerance
-Overexpression of hepatic gluconeogenic enzymes, reduction of glucokinase in pancreatic β-cells, overexpression of a tyrosine kinase, deficient insulin receptor in skeletal muscle, invalidation of glucose transporter GLUT4 in skeletal muscle & adipose tissue