Linked Life Data

11823447

Source:http://linkedlifedata.com/resource/pubmed/id/11823447

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pubmed-article:11823447pubmed:abstractTextCited2 (also Mrg1/p35srj) is a member of a new conserved gene family that is expressed during mouse development and in adult tissues. In order to investigate the function of Cited2 during mouse embryogenesis, we introduced a null mutation into the Cited2 locus. Cited2(-/-) mutants died at late gestation and exhibited heart defects and exencephaly, arising from defective closure of the midbrain (MB) and hindbrain. Initiation of neural tube closure at the forebrain-midbrain (FB-MB) boundary, an essential step for closure of the cranial neural tube, was impaired in the Cited2(-/-) mutants. Gene marker analysis using in situ hybridization revealed that the patterning of the anterior neural plate and head mesenchyme was little affected or normal in the Cited2(-/-) embryos. However, Cited2 was required for the survival of neuroepithelial cells and its absence led to massive apoptosis in dorsal neuroectoderm around the FB-MB boundary and in a restricted transverse domain in the hindbrain. Treatment with folic acid significantly reduced the exencephalic phenotype in the Cited2(-/-) embryos both in vivo and in vitro. However, assessment of folate metabolism revealed no defect in the Cited2(-/-) mutants, and the elevated apoptosis observed in the neuroepithelium of the Cited2(-/-) mutants was apparently not decreased by folic acid supplementation. To our knowledge, the Cited2 mouse represents the first genetic model in which folic acid can prevent a defect in neural tube closure by a mechanism other than the neutralization of a defect in folate homeostasis.lld:pubmed
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pubmed-article:11823447pubmed:articleTitleFolic acid prevents exencephaly in Cited2 deficient mice.lld:pubmed
pubmed-article:11823447pubmed:affiliationMRC Centre for Developmental Neurobiology, 4th floor New Hunt's House, King's College London, Guy's Campus, London Bridge, London SE1 1UL, UK. juan.martinez-barbera@kcl.ac.uklld:pubmed
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