Cortés Claudio R, Metzis Vicki, Wicking Carol
Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia.
Wiley Interdiscip Rev Dev Biol. 2015 Nov-Dec;4(6):637-53. doi: 10.1002/wdev.199. Epub 2015 Jul 14.
Over the past decade, the primary cilium has emerged as a pivotal sensory organelle that acts as a major signaling hub for a number of developmental signaling pathways. In that time, a vast number of proteins involved in trafficking and signaling have been linked to ciliary assembly and/or function, demonstrating the importance of this organelle during embryonic development. Given the central role of the primary cilium in regulating developmental signaling, it is not surprising that its dysfunction results in widespread defects in the embryo, leading to an expanding class of human congenital disorders known as ciliopathies. These disorders are individually rare and phenotypically variable, but together they affect virtually every vertebrate organ system. Features of ciliopathies that are often overlooked, but which are being reported with increasing frequency, are craniofacial abnormalities, ranging from subtle midline defects to full-blown orofacial clefting. The challenge moving forward is to understand the primary mechanism of disease given the link between the primary cilium and a number of developmental signaling pathways (such as hedgehog, platelet-derived growth factor, and WNT signaling) that are essential for craniofacial development. Here, we provide an overview of the diversity of craniofacial abnormalities present in the ciliopathy spectrum, and reveal those defects in common across multiple disorders. Further, we discuss the molecular defects and potential signaling perturbations underlying these anomalies. This provides insight into the mechanisms leading to ciliopathy phenotypes more generally and highlights the prevalence of widespread dysmorphologies resulting from cilia dysfunction.
在过去十年中,初级纤毛已成为一个关键的感觉细胞器,它是许多发育信号通路的主要信号枢纽。在此期间,大量参与运输和信号传导的蛋白质已与纤毛组装和/或功能相关联,这表明该细胞器在胚胎发育过程中的重要性。鉴于初级纤毛在调节发育信号方面的核心作用,其功能障碍导致胚胎中广泛的缺陷,进而导致一类不断扩大的人类先天性疾病(即纤毛病),这并不奇怪。这些疾病个体罕见且表型多样,但它们共同影响几乎每个脊椎动物器官系统。纤毛病中经常被忽视但报告频率越来越高的特征是颅面异常,范围从细微的中线缺陷到完全性的口面部裂。鉴于初级纤毛与许多对颅面发育至关重要的发育信号通路(如刺猬信号通路、血小板衍生生长因子和WNT信号通路)之间的联系,未来面临的挑战是了解疾病的主要机制。在这里,我们概述了纤毛病谱系中存在的颅面异常的多样性,并揭示了多种疾病中常见的缺陷。此外,我们讨论了这些异常背后的分子缺陷和潜在的信号紊乱。这更全面地深入了解了导致纤毛病表型的机制,并突出了纤毛功能障碍导致广泛畸形的普遍性。
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