HMGB factors are required for posterior digit development through integrating signaling pathway activities.

HMGB factors are required for posterior digit development through integrating signaling pathway activities.
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DOI:
10.1002/dvdy.22598
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发表时间:
2011-05
影响因子:
2.5
通讯作者:
Kawakami, Yasuhiko
Kawakami, Yasuhiko
中科院分区:
生物学3区
文献类型:
--
作者:
Itou, Junji;Taniguchi, Noboru;Oishi, Isao;Kawakami, Hiroko;Lotz, Martin;Kawakami, Yasuhiko

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染色质因子Hmgb 1和Hmgb 2在细胞过程中具有关键作用,包括转录和DNA修饰。为了鉴定Hmgb基因在胚胎发育中的功能,我们在小鼠中产生了Hmgb 1; Hmgb 2的双突变体。而双无效胚胎在E9.5时停滞,Hmgb 1-/-; Hmgb 2 +/-胚胎表现出前肢中最后一个趾5的缺失。我们发现Hmgb 1-/-; Hmgb 2 +/-前肢Shh信号水平降低,后部区域Wnt和BMP靶基因明显下调。此外,我们表明,斑马鱼胚胎中的hmgb 1和hmgb 2增强Wnt信号在各种组织中,和双敲低胚胎减少了Wnt信号和shh在胸鳍芽的表达。我们的数据表明,Hmgb 1和Hmgb 2功能冗余,以增强Wnt信号在胚胎中,并进一步表明,整合Wnt,Shh和BMP信号调节前肢中的dig 5的发展。
The chromatin factors Hmgb1 and Hmgb2 have critical roles in cellular processes, including transcription and DNA modification. To identify the function of Hmgb genes in embryonic development, we generated double mutants of Hmgb1;Hmgb2 in mice. While double null embryos arrest at E9.5, Hmgb1-/-;Hmgb2+/- embryos exhibit a loss of digit5, the most posterior digit, in the forelimb. We show that Hmgb1-/-;Hmgb2+/- forelimbs have a reduced level of Shh signaling, as well as a clear downregulation of Wnt and BMP target genes in the posterior region. Moreover, we demonstrate that hmgb1 and hmgb2 in zebrafish embryos enhance Wnt signaling in a variety of tissues, and that double knockdown embryos have reduced Wnt signaling and shh expression in pectoral fin buds. Our data show that Hmgb1 and Hmgb2 function redundantly to enhance Wnt signaling in embryos, and further suggest that integrating Wnt, Shh and BMP signaling regulates the development of digit5 in forelimbs.
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