CRE MOUSE MODELS TO STUDY AMELOGENESIS

项目概要/摘要 2017年6月，一群牙科研究人员在NIDCR会面，讨论牙釉质研究的未来， 在一份总结声明中得出结论，在釉质研究领域，缺乏研究釉质的模型， 疾病和疾病阻碍了最近的进展。该小组得出结论，更合适的成釉细胞- 像细胞系一样，对类器官和芯片技术的投资以及新的动物模型可以用来推进 外地关于动物模型，我相信牙釉质研究者没有牙釉质器官- 特异性Cre重组酶突变小鼠。在过去的20年里，釉质研究人员使用Krt 14-Cre （角蛋白14-Cre重组酶）突变体通过与各种loxP杂交育种来研究釉质特异性活性 鼠标线。使用Krt 14-Cre小鼠进行牙釉质研究的显著缺点是Krt 14 在多种组织中表达，包括皮肤、支气管上皮、舌、气管、唾液腺和许多 更多的器官，因此许多已开发的loxP小鼠品系不适合研究 釉质形成例如，阴离子交换蛋白（Slc 4a 2/AE 2）或其受体的mRNA表达水平可被检测。 囊性纤维化跨膜传导调节因子（Cftr），分别增加约6倍和3倍， 成釉器在成熟阶段（与分泌阶段相比），和超越牙齿形成两个基因 在肺和胰腺中广泛表达，对其发育至关重要。Slc 4a 2-null和Cftr-null 小鼠具有严重的牙釉质病变。为了使用Krt 14-Cre突变小鼠研究AE 2fl/fl或AE 2fl/fl的作用， Cftrfl/fl将具有显著的局限性，因为这些动物将可预见地遭受多个器官损害。 年轻时的失败。我建议建立两种动物模型，将Cre重组酶敲入小鼠的 成釉蛋白（Ambn）和牙源性成釉细胞相关（Odam）基因位点，使得Cre表达是 分别限于分泌型成釉细胞和成熟型成釉细胞。该补助金的UG 3阶段将 致力于开发这两种动物模型; Ambn-Cre和Odam-Cre，UH 3阶段将 验证这两种动物作为研究釉质形成的独特体内模型。在这个项目完成后 这些动物的数据将被公布，两条线都存放在适当的设施，如 Mutamt小鼠资源和研究中心（MMRRC）。

PROJECT SUMMARY / ABSTRACT In June of 2017 a group of dental researchers met at the NIDCR to discuss the future of enamel research and concluded, in a summary statement, that in the field of enamel research, a lack of models to study enamel formation and disease has hampered recent progress. The group concluded that more appropriate ameloblast- like cell lines, investment in organoid and chip technology and novel animal models could be used to advance the field. With respect to animal models, I believe enamel researchers suffer from not having enamel organ- specific Cre recombinase mutant mouse. For the past 2 decades enamel researchers have used the Krt14-Cre (keratin 14-Cre recombinase) mutant to study enamel-specific activities by cross breeding with various loxP mouse lines. The significant disadvantage of using the Krt14-Cre mouse for enamel research is that Krt14 is expressed in multiple tissues including skin, bronchial epithelia, tongue, trachea, salivary glands, and many more organs, and because of this many of the developed loxP mouse lines are not appropriate to study amelogenesis. For example, mRNA expression levels of the anion exchanger protein (Slc4a2/AE2), or the cystic fibrosis transmembrane conductance regulator (Cftr), increases ~ 6-fold and 3-fold respectively in the enamel organ during maturation stage (compared to secretory stage), and beyond tooth formation both genes are widely expressed in lung and pancreas and are critical to their development. Both Slc4a2-null and Cftr-null mice have severe enamel pathologies. To use the Krt14-Cre mutant mouse to study the role of either AE2fl/fl or Cftrfl/fl would have significant limitations because these animals would predictably suffer from multiple organ failures at a young age. I propose to develop two animal models with a knockin of Cre recombinase into the ameloblastin (Ambn) and odontogenic ameloblast-associated (Odam) gene loci such that Cre expression is limited to secretory ameloblasts and maturation ameloblasts respectively. The UG3 stage of this grant will be devoted to the development of these two animal models; Ambn-Cre and Odam-Cre, and the UH3 phase will validate these two animals as unique in vivo models to study amelogenesis. At the completion of this project data from these animals will be published, and both lines deposited in an appropriate facility such as the Mutamt Mouse Resource and Research Centers (MMRRC).