Giantin-knockout models reveal a feedback loop between Golgi function and glycosyltransferase expression.

Giantin-knockout models reveal a feedback loop between Golgi function and glycosyltransferase expression.
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DOI:
10.1242/jcs.212308
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发表时间:
2017-12-15
影响因子:
4
通讯作者:
Stephens DJ
Stephens DJ
中科院分区:
生物学2区
文献类型:
--
作者:
Stevenson NL;Bergen DJM;Skinner REH;Kague E;Martin-Silverstone E;Robson Brown KA;Hammond CL;Stephens DJ

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高尔基体是复杂糖基化的细胞中枢,控制复杂蛋白聚糖、受体、配体和糖脂的精确加工。它的结构和组织依赖于golgins,它束缚池膜和传入的运输囊泡。在这里,我们表明,敲除最大的高尔基体,巨人蛋白,导致基因表达的重大变化,但只有有限的影响高尔基体结构。值得注意的是,22高尔基体驻留的糖基转移酶,但不是聚糖加工酶或ER糖基化机制,差异表达Giantin消融后。这包括在哺乳动物细胞和斑马鱼模型中GALNT 3功能的几乎完全丧失。Giantin基因敲除的斑马鱼表现出骨质增生和异位钙沉积,重现了高磷酸盐血症家族性肿瘤性钙质沉着症的表型,这是一种由GALNT3突变引起的疾病。这些数据揭示了高尔基体内平衡的一个新特征:调节糖基转移酶表达以产生功能性蛋白质组的能力。总结:基因组工程细胞系和斑马鱼模型中Giantin的敲除揭示了高尔基体通过基因表达变化控制自身生物化学的能力。
The Golgi is the cellular hub for complex glycosylation, controlling accurate processing of complex proteoglycans, receptors, ligands and glycolipids. Its structure and organisation are dependent on golgins, which tether cisternal membranes and incoming transport vesicles. Here, we show that knockout of the largest golgin, giantin, leads to substantial changes in gene expression but only limited effects on Golgi structure. Notably, 22 Golgi-resident glycosyltransferases, but not glycan-processing enzymes or the ER glycosylation machinery, are differentially expressed following giantin ablation. This includes near-complete loss of function of GALNT3 in both mammalian cell and zebrafish models. Giantin-knockout zebrafish exhibit hyperostosis and ectopic calcium deposits, recapitulating phenotypes of hyperphosphatemic familial tumoral calcinosis, a disease caused by mutations in GALNT3. These data reveal a new feature of Golgi homeostasis: the ability to regulate glycosyltransferase expression to generate a functional proteoglycome. Summary: Knockout of giantin in a genome-engineered cell line and zebrafish models reveals the capacity of the Golgi to control its own biochemistry through changes in gene expression.
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