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• W2064884086 abstract "Wnt-1 and Wnt-3a proto-on-cogenes have been implicated in the development of midbrain and hindbrain structures. Evidence for such a role has been derived from in situ hybridization studies showing Wnt-1 and -3a expression in developing cranial and spinal cord regions and from studies of mutant mice whose Wnt-1 genes have undergone targeted disruption by homologous recombination. Wnt-1 null mutants exhibit cranial defects but no spinal cord abnormalities, despite expression of the gene in these regions. The absence of spinal cord abnormalities is thought to be due to a functional compensation of the Wnt-1 deficiency by related genes, a problem that has complicated the analysis of null mutants of other developmental genes as well. Herein, we describe the attenuation of Wnt-1 expression using antisense oligonucleotide inhibition in mouse embryos grown in culture. We induce similar mid- and hindbrain abnormalities as those seen in the Wnt-1 null mutant mice. Attentuation of Wnt-1 expression was also associated with cardiomegaly resulting in hemostasis. These findings are consistent with the possibility that a subset of Wnt-1 expressing cells include neural crest cells known to contribute to septation of the truncus arteriosus and to formation of the visceral arches. Antisense knockout of Wnt-3a, a gene structurely related to Wnt-1, targeted the forebrain and midbrain region, which were hy-poplastic and failed to expand, and the spinal cord, which exhibited lateral outpocketings at the level of the forelimb buds. Dual antisense knockouts of Wnt-1 and Wnt-3a targeted all brain regions leading to incomplete closure of the cranial neural folds, and an increase in the number and severity of outpocketings along the spinal cord, suggesting that these genes complement one another to produce normal patterning of the spinal cord. The short time required to assess the mutant phenotype (2 days) and the need for limited sequence information of the target gene (20-25 nu-cleotides) make this antisense oligonucleotide/ whole embryo culture system ideal for testing the importance of specific genes and their interactions in murine embryonic development. © 1993 Wiley-Liss, Inc." @default.
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• W2064884086 date "1993-01-01" @default.
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• W2064884086 title "Antisense attenuation ofWnt-1 andWnt-3a expression in whole embryo culture reveals roles for these genes in craniofacial, spinal cord, and cardiac morphogenesis" @default.
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• W2064884086 doi "https://doi.org/10.1002/dvg.1020140611" @default.
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