Generation of FLAG-tagged Arx knock-in mouse model.

Generation of FLAG-tagged Arx knock-in mouse model.
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FLAG标记的Arx敲入小鼠模型的产生。

DOI:
10.1002/dvg.23479
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发表时间:
2022-07
期刊:
Genesis (New York, N.Y. : 2000)
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其他
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Aristaless-related homeobox(ARX)是一种在脑发育中起重要作用的同源异型框转录因子。具有ARX突变的患者具有一系列神经发育障碍,例如癫痫、智力残疾和自闭症谱系障碍,伴有或不伴有脑结构异常,例如无脑回畸形(光滑脑)、小头畸形(小脑)和/或胼胝体发育不全。小鼠模型为研究ARX在这些疾病中的病理生理作用提供了重要线索。然而,成功分离特异性的ARX与DNA和蛋白质的体内复合物仍然是一个挑战。为了促进ARX复合物的体内检测,我们使用CRSPR/Cas9策略产生了含有靶向内源性Arx基因的翻译起始位点的FLAG-标签的一个表位(1 x FLAG)的小鼠系。纯合子Flag-Arx小鼠是可存活的且可生育的,没有大体异常,这表明FLAG标签不会干扰ARX的正常功能。使用FLAG抗体,我们成功地用免疫荧光染色检测到ARX,并在胚胎脑组织中拉下ARX。该Flag-Arx小鼠模型将是从小鼠组织中分离ARX复合物用于许多应用的有用工具。
Aristaless-related homeobox (ARX) is a paired-like homeodomain transcription factor playing important roles in brain development. Patients with mutations in ARX have a spectrum of neurodevelopmental disorders such as epilepsy, intellectual disability, and autism spectrum disorder, with or without structural abnormalities of the brain such as lissencephaly (smooth brain), microcephaly (small brain), and/or agenesis of corpus callosum. Mouse models have provided important clues on the pathophysiologic roles of ARX in these disorders. However, successfully isolating specific in vivo complex of ARX, with DNA and proteins, has remained as a challenge. To facilitate in vivo detection of ARX complexes, we generated a mouse line containing one epitope of FLAG-tag (1 x FLAG) targeted at the translational start site of the endogenous Arx gene using CRSPR/Cas9 strategy. Homozygous Flag-Arx mice are viable and fertile without gross abnormality, suggesting that the FLAG-tag does not perturb normal function of ARX. Using a FLAG antibody, we successfully detected ARX with immunofluorescent staining and pulled down ARX in embryonic brain tissues. This Flag-Arx mouse model will be a useful tool to isolate ARX complexes from mouse tissues for many applications.
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