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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Occurrence of cleft palate, palatal slit, and fetal death in mice treated with a glucocorticoid: an embryo transfer experiment.

SWV and C57BL/6 (C57BL) mice were treated subcutaneously with triamcinolone acetonide in a single dose of 2.5 mg/kg on day 12 of pregnancy (vaginal plug = day 0), and the palate of their fetuses was examined at term. Cleft palate was seen in some SWV and C57BL fetuses; its frequency was significantly higher in the former. Closer examination revealed palatal slit in some C57BL, but in no SWV fetuses. In addition, fetal mortality was significantly increased in SWV, but not in C57BL, exposed to triamcinolone. These strain differences in cleft palate, palatal slit, and fetal mortality were investigated by embryo transfer. The results showed that, in cleft palate induction, the effects of uterine environment were more important than those of fetal genotype. On the other hand, after transfer, palatal slit still occurred in C57BL but not in SWV fetuses; thus, in palatal slit occurrence, the fetal genotype played a more important role than the uterine environment. Accordingly, it is suggested that the nature of the participation of fetal genotype and uterine environment in palatal slit occurrence is different from that in cleft palate induction. In regard to fetal mortality, embryo transfer procedures influenced it in SWV dams and the effect of triamcinolone could not be detected after embryo transfer.[1]

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