Zinc metabolism in lethal-milk mice. Otolith, lactation, and aging effects - PubMed (original) (raw)
Zinc metabolism in lethal-milk mice. Otolith, lactation, and aging effects
L C Erway et al. J Hered. 1984 Nov-Dec.
Abstract
Lethal-milk (lm), a recessive mutation, occurred in the C57BL/6J inbred strain of mice. Lactating lm dams produce a zinc-deficient milk that is lethal to all nursing pups. If foster-nursed on normal dams, lm pups survive and become reproductively mature. Injection of zinc-glycinate into the pups or zinc supplementation of the water of the lactating dams reduces lethality. Other pleiotropic effects in lm mice include congenital otolith defects with delayed righting, "tail-spinning," and abnormal swimming. These effects are diagnostic criteria for segregation of lm mice among backcross progeny. About 40 percent of the expected number of lm pups survive to weaning. Zinc supplementation of the dam improves development of saccular but not of utricular otoliths; zinc does not improve survival of the lm pups among backcross progenies. The lm mice over eight months of age also exhibit extensive hair loss, dermatitis, and skin lesions. Possible roles of metallothionein in zinc and copper metabolism are discussed in regard to the pleiotropic effects of the lethal-milk mutation.
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