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- W2023174855 abstract "Morphometric methods were used to investigate variation in the skeletons of 1030 offspring produced from matings of male DBA/2J by female C57BL/6J mice. 751 offspring originated from males that had received a single intraperitoneal injection of ethyl nitrosourea (EtNU) at a dose of 250 mg/kg. The remainder of the mice served as controls. The male parents of the controls were injected only with the buffer used as vehicle for the EtNU. Offspring were obtained for 3 weeks following injection. The treated males were then sterile for about 8 weeks. Immediately after the sterile period another sample of progeny was obtained. In the treated group, litter sizes at birth and weaning were reduced and survival to adulthood was lower. However, none of the differences were statistically significant. The skeletons were evaluated by two independent approaches. The first relied upon gross observation for unusual phenotypic variation, the second on a series of metrical measurement and coordinate data. A considerable amount of variation was recorded by both approaches. Some of the variants were severe but others were mild and perhaps of little or no importance to the health of the mice. The gross observation method produced no evidence for increased mild or severe variants in any group of offspring from the treated mice. The metrical methods also showed no evidence for treatment-related effects in offspring produced during the first 3 weeks of mating. However, in offspring produced after the sterile period, a pronounced, very highly statistically significant increase in all levels of metrical variation was observed. This treatment group revealed both increased variant measures and increased numbers of mice with variant measures. Much of this variation was so slight that it would have escaped notice were it not for the exacting measurements used in the analysis. Our morphometric approach is an analytically powerful tool, suitable for detecting variation in virtually any biological structure that can be measured. If the increased variation reported here is due to induced mutations, the effects would be consistent with that expected from slightly harmful mutations distributed throughout the mouse genome. It is appropriate to consider such effect in connection with genetic risk estimation." @default.
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- W2023174855 date "1990-04-01" @default.
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- W2023174855 title "High resolution metrical analysis applied to the assessment of damage associated with induced mutations in the mouse" @default.
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- W2023174855 doi "https://doi.org/10.1016/0027-5107(90)90089-m" @default.
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