nervous system
hydrocephaly
(
J:50972
)
• incomplete penetrance; 37% of homozygous mice exhibited this phenotype on a mixed 129P2/Ola Hsd and C57BL/6 genetic background
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• by postnatal day 40 severe hydroencephaly associated with dilation of the fourth and left ventricles was observed
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• at postnatal day 15, 25% of mutant brains showed marked dilation of the lateral ventricles with no obvious defects in the morphology of the cerebellum or the cerebral cortex
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• in all affected brains the cerebral cortex was thinned and the hippocampus was displaced dorsally, although the cellular organization of the cerebellum and the cerebral cortex was grossly normal
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• the number of dorsal D1A commissural interneurons in E12.5, E13.5, and E14.5 spinal cord was reduced by about 92% compared with wild-type embryos, with no apparent change in the number of D1B neurons
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