[The genetic differences in the microsomal activity of rats]

The lipid composition and synthesis rate in liver microsomes of linear and hybrid rats are investigated. It is found that microsomes of hybrid rats had less amount and synthesis rate of phosphatidylcholine and phosphatidylethanolamine as well as nonesterified fatty acids. Linear rats differed from each other in phosphatidylinositol exchange rate. These genetic peculiarities of the microsomal lipid composition and synthesis rate can explain the experimentally determined absence of correlation between glucose-6-phosphatase activity and lipid maintenance in membranes of different genetic forms.