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

Early morphological abnormalities in splotch mouse embryos and predisposition to gene- and retinoic acid-induced neural tube defects.

Genetic and environmental factors contribute to an individual's neural tube defect liability. In the mouse, the gene mutation Splotch ( Sp) causes a pigmentation defect in heterozygotes while homozygotes have spina bifida +/- exencephaly. Splotch homozygotes, heterozygotes, and wild-type embryos were examined for somite number, anterior neuropore closure, and posterior neuropore length. The aim was to distinguish potentially affected homozygotes early in pathogenesis and find a morphological basis for increased teratogen susceptibility in heterozygotes. Posterior neuropore closure as well as anterior neuropore closure was significantly delayed in potentially affected Sp as compared to wild-type litter embryos exceeding the incidence found in day-10-diagnosed homozygotes. Part of this excess was attributed to a transient delay in heterozygotes which in turn might predispose to retinoic acid-induced neural tube defects. This idea was supported by an outcross of Sp heterozygote males by inbred SWV females and wild-type males by SWV where a significant increase in retinoic acid-induced neural tube defects was found in Sp carrier litters.[1]

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