Activity of A and B types of monoamine oxidase (MAO) has been investigated in the brain stem and brain hemispheres of mink males of five genotypes for coat color mutations: standard dark-brown (+/+); heterozygous for the semidominant mutation Black crystal(Cr/+); homozygous for the semidominant mutation Black cross, or “95% White” (S/S); heterozygous for the semidominant mutationShadow(S H/+); and homozygous for the semirecessive mutation hedlund white(h/h). The main changes in the activity of the A and B MAO types occur in the brain hemispheres. A reduced activity of MAO A has been recorded in the hemispheres of Black crystalminks (Cr/+) and an elevated activity, in the hemispheres of Shadow(S H/+) and 95% White(S/S). The activity of MAO B is reduced in the hemispheres of Black crystaland elevated in the hemispheres of hedlund white(h/h). An increased MAO A activity has also been recorded in the brain stem of Shadowminks (S H/+). It is suggested that genes controlling coat color have a pleiotropic effect on sexual behavior in males and the endocrine function of testicles mediated by a putative change in the metabolism of brain neurotransmitters, substrates of MAOs A and B.
Russian Journal of Genetics – Springer Journals
Published: Oct 16, 2004
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