PMID: 816676Apr 1, 1976

Importance of genetic factors influencing the metabolism of foreign compounds

Federation Proceedings
D W Nebert, J S Felton


Gene differences may alter an individual's response to foreign compounds by affecting their absorption, binding, distribution, excretion, biotransformation, or drug-drug interactions. Genetic differences in the metabolism of xenobiotics among inbred strains of various laboratory animals and model systems are reviewed. The inbred mouse has been studied most extensively. Genetic differences in toxicity are shown to be caused by various environmental pollutants in several inbred strains of mice and in siblings of the (C57BL/6N)(DBA/2N)F1 X DBA/2N backcross, in which the phenotypes "aromatic hydrocarbon responsiveness" or "nonresponsiveness" had been predetermined. This trait of "responsiveness"--which refers to the capacity for induction of cytochrome P1450 and numerous monooxygenase activities by certain aromatic compounds--segregates almost exclusively as a single gene among offspring of this backcross. All nonresponsive mice ingesting benzo/a/pyrene (about 125 mg/kg per day) die within 4 weeks, whereas the survival of responsive mice receiving the chemical orally is not significantly different from that of control mice; the apparent cause of early death in these experiments in toxic depression of the bone marrow. The life span ...Continue Reading

Related Concepts

Metabolic Process, Cellular
C57BL/6N Mouse
DBA/2N Mouse
Genetic Conditions, Dominant
Bone Marrow
Inbred Strain
Xenobiotic Monooxygenases

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