Endodermal pouch-expressed dmrt2b is important for pharyngeal cartilage formation.

Endodermal pouch-expressed dmrt2b is important for pharyngeal cartilage formation.
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内胚层囊表达的 dmrt2b 对于咽软骨的形成很重要。

DOI:
10.1242/bio.035444
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发表时间:
2018-12-17
期刊:
影响因子:
2.4
通讯作者:
Wang Q
Wang Q
中科院分区:
生物学4区
文献类型:
--
作者:
Li L;Mao A;Wang P;Ning G;Cao Y;Wang Q

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摘要咽囊是前肠内胚层的一系列外囊,是颅面骨骼形成所必需的。然而,内胚层囊调节头软骨发育的分子机制尚未完全了解。在这项研究中,我们发现,斑马鱼dmrt 2b,一个基因编码的Doublemex和单克隆抗体-3相关的转录因子,是专门表达在内胚层袋和正常的咽软骨发育所需的。dmrt 2b的丢失不影响颅神经嵴(CNC)的规格和迁移,但通过降低CNC细胞移动到咽弓后的cxcl 12 b表达导致软骨形成前的冷凝缺陷。此外,dmrt 2b失活导致CNC细胞增殖减少和分化受损。我们还表明,dmrt 2b抑制crossveinless 2在内胚层袋的表达,以维持BMP/Smad信号在弓,从而促进CNC细胞增殖和软骨分化。这项工作提供了深入了解转录因子表达的内胚层袋调节咽骨骼的发展,通过组织-组织的相互作用。总结:转录因子dmrt 2b促进cxcl 12 b在内胚层囊中的表达以加速颅神经嵴细胞的凝聚,但抑制crossveinless 2的表达以支持细胞生长和软骨分化。
ABSTRACT Pharyngeal pouches, a series of outpocketings derived from the foregut endoderm, are essential for craniofacial skeleton formation. However, the molecular mechanisms underlying endodermal pouch-regulated head cartilage development are not fully understood. In this study, we find that zebrafish dmrt2b, a gene encoding Doublesex- and Mab-3-related transcription factor, is specifically expressed in endodermal pouches and required for normal pharyngeal cartilage development. Loss of dmrt2b doesn't affect cranial neural crest (CNC) specification and migration, but leads to prechondrogenic condensation defects by reducing cxcl12b expression after CNC cell movement into the pharyngeal arches. Moreover, dmrt2b inactivation results in reduced proliferation and impaired differentiation of CNC cells. We also show that dmrt2b suppresses crossveinless 2 expression in endodermal pouches to maintain BMP/Smad signaling in the arches, thereby facilitating CNC cell proliferation and chondrogenic differentiation. This work provides insight into how transcription factors expressed in endodermal pouches regulate pharyngeal skeleton development through tissue–tissue interactions. Summary: Transcription factor dmrt2b facilitates cxcl12b expression in endodermal pouches to accelerate cranial neural crest cell condensation, but suppresses crossveinless 2 expression for supporting cell growth and chondrogenic differentiation.
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