Genetically engineered animals carrying defined alterations in their g
enome can represent invaluable tools for better understanding complex
polygenic diseases such as noninsulin-dependent diabetes mellitus (NID
DM) at the molecular level. The structure or expression of a number of
genes potentially involved in insulin action or pancreatic beta-cell
function have recently been altered in the mouse using transgenic or g
ene-targeting approaches, The obtention of such mice is the first step
towards the development of animal models carrying multiple gene defec
ts which would be very useful in NIDDM research.