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- W1997640596 abstract "NK homeobox genes have been shown to play important roles in cell-type specification and organogenesis. Murine Bapx1, a member of NK homeobox gene family, is expressed in all the cartilageous tissues that undergo endochondral bone formation, and in gut mesentery during embryogenesis, suggesting that Bapx1 may be a key transcription factor ragulating the development of these organs.We generated Bapx1-deficient mice by gene targeting. Bapx1-/- mice exhibited lethal skeletal dysplasia, with abnormal development of the vertebral column and some craniofacial bones, accompanied with asplenia and gastroduodenal malformation. We showed that the proliferative activity of the sclerotome cells, forming the vertebral column, was significantly reduced in Bapx1-/- embryos. The sclerotome cells of the mutants appeared to migrate and condense normally, but subsequent differentiation into the mature vertebral bodies and intervertebral discs were affected. The sclerotome cells in the vertebral bodies failed to differentiate into hypertrophic chondrocytes, as revealed by the undetected expression of Col10a1 and Osteopontin, and the sclerotome cells in the intervertebral discs failed to express the typical extracellular matrix proteins Col2a1, Col9a2 and aggrecan. Furthermore, we investigated the effect of loss of Bapx1 on the expression of some transcription factors, identified to be expressed in the developing sclerotome and be required for normal development of the vertebral column. Among them, we found that the expression of MFH-1 (mesenchyme forkhead-1), which was reported to regulate the proliferation and differentiation of sclerotome cells, was significantly reduced in ventromedial sclerotome cells in Bapx1-/- mice.Our analysis provided evidence that Bapx1 was indispensable for normal development of ventromedial structure of vertebral column and some of craniofacial bones, splenogenesis and morphogenesis of gastroduodenal tract." @default.
- W1997640596 created "2016-06-24" @default.
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- W1997640596 date "2000-06-01" @default.
- W1997640596 modified "2023-10-09" @default.
- W1997640596 title "Targeted disruption of the homeobox transcription factor<i>Bapx1</i>results in lethal skeletal dysplasia with asplenia and gastroduodenal malformation" @default.
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- W1997640596 doi "https://doi.org/10.1046/j.1365-2443.2000.00339.x" @default.
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