We thank Kristen Kwan for the pCS2-H2A.F/Z-EGFP and pCS2-mCherry-CAAX vectors. We thank Chris Rodesch for tutoring us in live imaging in zebrafish. We thank Shawn Williams, Erik Malarkey and Brad Yoder for assistance in confocal imaging at UAB and the High Resolution Imaging Facility at UAB. The High Resolution Imaging Facility is supported by the UAB Comprehensive Cancer Center Support Grant (P30CA013148) and the Rheumatic Disease Core Center (P30 AR048311). J.M.P. is supported by the National Institute of Neurological Disease and Stroke (NIH R21 NS092105), and pilot grants from American Cancer Society (ACS IRG-60-001-53-IRG) and the UAB Comprehensive Cancer Center (P30CA013148). S.M.P. is supported by the Cell and Molecular Biology T32 Training Grant (5T32GM008111-28).

1. 体外转录<ol><li>线性化PCS2-H2A.F / Z-EGFP和/或PCS2-mCherry-CAAX载体通过的NotI限制性内切酶消化31。 体外转录试剂盒使用RNA，产生从每个模板5&#39;加帽mRNA产物，根据制造商的协议。 </li><li>净化用纯化试剂盒的皑皑的mRNA。按照制造商的说明。用无RNase H 2 O洗脱</li><li>确定在使用分光光度计260nm处吸光度的RNA的浓度。 （OD 260×稀释×40微克/毫升）。 </li><li>稀释的RNA至100毫微克/微升的每个H2A.F / Z-EGFP和mCherry-CAAX无RNA酶的H 2 O如果RNA浓度过低，荧光会被减少或不存在。光明的样本将逐渐减少光毒性和光漂白的关注。另一方面，过多的RNA可能是有毒的和/或引起脱靶效应。 注:存储剩余纯化的mRNA在-80℃的冰箱中。 </li></ol> 2.斑马鱼繁育，胚胎收集，和mRNA注射36-38 <ol><li>组装养殖坦克的障碍，坦克分成两个区域，并填写在斑马鱼设施所用养殖系统中的水每一个养殖池。 </li><li>为了防止过早配种，将两个雄鱼的屏障的一侧，两名女鱼放在另一边的夜滋生了。 </li><li>第二天，在冰上解冻预先制备的mRNA混合物中。用新鲜的水产养殖​​系统中的水替换养殖箱水和消除障碍。的障碍被拉到后，立即温热注射模具至28.5℃，并设置在设备的显微注射。 注:有关注塑模具的信息，请参考格拉赫36。 </li><li>收集鸡蛋每10 - 用滤茶15分钟，冲洗鸡蛋放到一个干净的100×15毫米的培养皿有E3蓝（5毫米氯化钠，0.17毫米氯化钾，0.33毫米氯化钙2，0.33mm的硫酸镁 ，10 -5％亚甲蓝）。 E3蓝用于防止真菌生长和确保仔鱼的适当发展。有关配套和胚胎收集更多信息，请参阅格拉赫36和37 Porazinkski。 </li><li>嵌入单细胞期胚在温热注塑模具和注入RNA进入蛋黄中的胚胎（ 图1A）的所需量。账户自然胚胎死亡和未受精的胚胎通过在15％以上的胚胎比实验所需进行胚胎注射。有关斑马鱼的胚胎显微注射的更多详细信息，请参考格拉赫36和37 Porazinkski。 注:对于第一次使用的mRNA，进行剂量曲线分析，以确定荧光和活力（定义为无毛发育缺陷最多5 DPF）执行5D成像之前的最佳剂量。 150 - 200纳克/微升注入胚胎往往是最佳浓度，因此它是为最终浓度的良好的起点。 </li><li>仔细提取采用改良9"玻璃巴斯德吸管模具注入胚胎。要修改吸管，熔体使用本生灯，直到它形成了一个球结束。 </li><li>将注射胚胎在E3蓝100×15毫米的培养皿和房屋在28.5℃培养箱。 </li><li>六小时后注射，从平板除去任何死亡或未受精的胚胎，并添加干净E3蓝。房子胚胎在28.5℃。 </li></ol> 3.制备及成像活斑马鱼胚胎嵌入（图1B） <ol><li>成像前两小时，屏幕采用了荧光解剖显微镜对GFP注入胚胎。将鲜绿色的绿色荧光蛋白表达的胚胎在一个新的100×15毫米培养皿E3蓝。 </li><li>通过加入1g低熔点的琼脂糖至100毫升的E3蓝煮沸1％低熔点琼脂糖的原液。使用琼脂糖后，用铝箔覆盖的烧瓶中。原液保持为长达一个月有用。 </li><li>等分试样将3ml熔化的琼脂成17×100毫米的培养管中。通过将培养管在42℃水浴，直到准备使用保持琼脂糖温暖。制备在去离子水中的15mM的三卡因溶液来麻醉斑马鱼胚胎36。 注意:如果在较早的时间点成像是期望的，琼脂的浓度可以降低低到0.3％39。 </li><li>把15毫三卡因，筛选胚胎，低熔点琼脂糖，E3蓝，和35毫米的玻璃盖玻片底培养皿到解剖光学显微镜。仔细＃5镊子取出胚胎的绒毛。做到这一点的三个胚胎。 </li><li>放置在一个单独的容器中的dechorionated胚胎被麻醉。盖玻片底培养皿的盖通常用于此目的。用移液管，加三滴（约150微升）15毫米三卡因到5ml E3蓝盘（如果使用盖玻片底部盘的盖子），或直到胚​​胎已被充分麻醉。此外，加3-4滴 - 15毫米三卡因溶液（约150 200微升）到1％琼脂糖融化管。 </li><li>使用1厘米切断了枪头的P200移液器;在麻醉的胚胎转移到盖玻片底培养皿。删除多余的E3蓝:三卡因溶液。 </li><li>慢慢加入5 - 10微升低熔点琼脂糖的:三卡因溶液在胚胎中，保持每个液滴分开，保证了胚胎不小心漂移彼此接近。 警告:如果琼脂糖太热，会损坏胚胎。一个良好的温度维持在琼脂为42℃。 </li><li>使用21g的1个半针，轻轻定向在琼脂糖到所需位置的胚胎。当使用时间推移成像倒置显微镜，东方感兴趣区域（ROI）尽量靠近盖玻片作为possib地区勒。 注意:对于一般用途，尾部区域提供易于取向和清晰度由于相对薄组织（ 图1A）。其他组织，如围绕蛋黄和鳍褶皱上皮细胞层，可以使用28,29。这些组织提供了极大的清晰度，但是这些地区只有少数细胞层厚。对于这个协议的目的，是形象有利于获得尽可能多的细胞分裂尽可能尾部区域。 </li><li>允许琼脂局部凝固几分钟。使用针掰开一小块琼脂，以测试其固化。当一块琼脂可以从下拉被拉远，进行到下一个步骤。 </li><li>覆盖低熔琼脂形成了嵌入式胚胎圆顶整个盖玻片。允许琼脂到移动的菜对于共焦成像（ 图1A）之前固化。 </li><li>在琼脂凝固过程（大约需要10分钟），制备3-毫升邻同（约250微升）的15mM三卡因五滴˚FE3蓝溶液到在成像期间被放置在嵌入胚胎。 </li></ol>活斑马鱼胚胎40,41 4. 5D聚焦成像注:请参阅有贺40和41奥布莱恩关于如何使用其他共聚焦系统来执行5D影像细节。对于Z-间隔，Z堆叠，Z深度，时间间隔，和5D定义，请参见图1C。 <ol><li>打开成像软件并设置显微镜60X 1.4 NA物镜。适用浸油物镜，并放置在显微镜舞台上的滑动架的培养皿。使用轴控制器，居中的物镜上述感兴趣的胚胎，并把物镜向上满足培养皿。 </li><li>点击目镜图标并切换到显微镜上的GFP过滤器。专注于投资回报率。着眼于组织最接近盖玻片便邻FFER最佳的成像效果。 </li><li>拆下互锁。选择GFP和mCherry通道（软件预先设定的波长）并设置行均选择正常。 </li><li>使用"查看/采集控制/ A1扫描区域"命令打开A1扫描区域的工具。 </li><li>开始扫描。使用轴控制器，定位胚胎使得扫描区域填充有尽可能多的斑马鱼尽可能的。激光功率并不需要在这一点上最佳的。降低激光功率，以避免不必要的光漂白。 </li><li>使用"查看/采集控制/ ND收购"命令打开ND采集控制面板。 </li><li>开始扫描设置Z-栈参数。设置Z-堆栈上限至细胞，其中未聚焦和下限，其中细胞不再可见。允许一个3微米空间中的采样生长和细胞运动之上，其可以扩展到成像领域。的Z堆叠对该亲所示的附图母育酚在胚胎尾覆盖40μm的Z深度。 </li><li>的Z区间的步长设置为2微米。平均来说，一个细胞的直径为10微米;因此2微米会产生对每个小区进行分析成像数据五个间隔。 注:可获取的图像的深度取决于在Z间隔。 Z轴分辨率牺牲来获得在Z尺度整体深度以图像为许多细胞有丝分裂经历尽可能（大Z深度）。逆是真实的，在通过减小步长，Z轴分辨率的不断积累，而Z向深度处死（小Z深度）。 </li><li>调整图像的激光功率，HV，和偏移水平。对于这个协议证明实验中，使用下面的激光功率，高压和偏移，分别设置在相应的水平，为GFP通道电平; 2 - 5 120 - 140，和-9至-11。对于mCherry通道，使用下面的激光功率，高压和失调的水平，分别为; 3 - 6，120 - 140，和-3至-8。一旦参数被设定，关闭扫描，以防止不必要的激光曝光可能导致样品的光毒性和漂白。 </li><li>选择2倍线平均图标。 "不平均"产生颗粒感的图像，而"4倍平均线"极大地提高了扫描时间。 2X线平均的使用提供最佳的图像质量和最快的扫描时间。 </li><li>选择所需的实验适当的时间间隔和持续时间。对于野生型师，2小时两分钟的时间间隔是最佳的，用于确定有丝分裂的持续时间（在图1，图2，图3A和3B中）。该激活纺锤体装配检验点的时间超过30分钟，司更适合于四小时间隔五分钟，以便如在图3C中展示了以保持荧光。 </li><li>勾选"保存到文件"框并命名文件自动保存文件作为被收购它。仔细检查所有的PArameters设置正确，然后点击"开始→运行"。 </li><li>收购完成后，要查看三维格式的文件，点击量门槛图标。 </li></ol>

The authors have nothing to disclose.

该方法的使用允许人们推断核膜破裂，通过微管的着丝点的附件形成中期板的，和姐妹染色单体的分离，以形成在体内和一个时间依赖性两个新的细胞。在斑马鱼中观察到的有丝分裂的能力是在固定的样品和细胞培养系统有利的，因为细胞在自然生理被成像，组织是透明其允许要使用的荧光蛋白质，他们开发比较快，和延时成像可以获取。成年斑马鱼的这个协议的使用是由于可能因被收购?...

有丝分裂为生长，分化和再生在活生物体中的关键的细胞过程是必不可少的。在准确的准备和在间DNA的复制，使细胞被起动来划分。有丝分裂，前期，第一阶段是由细胞周期蛋白B / CDK1的活化启动。前期的特征在于染色材料的缩合到染色体。核膜破裂发生在前期和前中期之间的过渡。在早中期，中心体，主轴形成成核中心，开始迁移到对立的两极，而在寻找着丝点附件延伸的微管。一旦附件转换到最终的微管附着和张力定位形成中期板1染色体。如果所有染色体正确连接时，纺锤体装配检验点满足，黏着​​环抱着姐妹染色单体一起被切开，微管缩短拉妹妹染色单体到对立的两极后期2,3时。最后阶段，末期，涉及围绕两个新的核核膜的细胞和改革的延伸。胞质分裂完成通过分离两个新的子细胞4-6的细胞质分裂过程。关键有丝分裂途径（ 即纺锤体装配检验点，中心体复制，姐妹染色单体凝聚力等 ）的改变可能会导致中期逮捕，染色体missegregation和基因组不稳定性7-10。最终，在通路控制有丝分裂的缺陷会导致发育障碍和癌症，有丝分裂的迫使可视化和其在现场，脊椎动物，多细胞生物体10-16缺陷。 斑马鱼的胚胎作为实时成像一个伟大的模式生物，由于透明组织，易于注射的，快速发展。使用斑马鱼，这份手稿的总体目标是描述的活5D有丝分裂17（ 图1C）的（尺寸的X，Y，Z，时间和波长）成像的方法。利用斑马鱼突变体在不同有丝分裂的途径有缺陷的论证这种缺陷的结果。对于这个协议，极光B和Esco2突变体被选择来说明这些缺陷。极光B是一种激酶是参与纺锤体形成和微管附着的染色体乘客复合物（CPC）的一部分。它也需要在胞质18,19分裂沟的形成。在斑马鱼中，极光B缺乏导致皱纹的诱导，细胞分裂和染色体分离20的缺陷。 Esco2，另一方面，是一种乙酰这对姐妹染色单体凝聚力21,22是必不可少的。它乙酰化上从而稳定黏结，以确保正确的染色体分离的中期-后期过渡23环的SMC3部黏着。在斑马鱼Esco2的丧失导致为chromosome missegregation，过早姐妹染色单体分离，基因组不稳定和p53依赖性和独立的凋亡24,25。由于可用性，auroraB hi1045 和 esco2 hi2865突变斑马鱼（以下简称为aurB M / M和esco2 米/分 ，分别地）将被用来说明此技术25-27。 用荧光标记的细胞的机械耦合共焦显微镜使研究人员有丝分裂25,28,29中可视化染色和细胞膜动力学。荧光标记的组蛋白在历史上被用于可视化的染色质。组蛋白是四种不同的对（H2A，H2B，H3和H4）是负责该构成染色体30中的核小体结构组成的核蛋白质。尽管H2B可以说是在荧光蛋白中最常用的组蛋白小鼠和细胞培养，用组蛋白2A的，家庭Z（H2A.F / Z）已在斑马鱼31,32使用证明很好。伴刀豆球蛋白A和酪蛋白激酶1-γ，例如，定位于细胞膜和先前已显示有效的可视化细胞膜在海胆和果蝇33,34。其它研究已经表明，CAAX荧光标记蛋白标记的细胞膜并成功地斑马鱼31。 CAAX是受翻译后修饰的酶如farnesyltransferases和geranylgeranyltransferases识别的基序。由这些酶修饰导致蛋白质成为膜相关，从而标记的细胞膜35。 由于在斑马鱼的先前使用，该协议选择使用H2A.F / Z和CAAX标记染色质和细胞膜。这种方法的应用将允许研究者在单个细胞水平监测的有丝分裂，观察个人染色体动力学，以及同时监测可能影响组织的分化和发育的多个细胞分裂。本文将着眼于在单个单元格级别的有丝分裂过程中染色体成像分离的动态。在这个手稿，观察几个有丝分裂，分裂计算时间和破译的有丝分裂表型的能力进行说明和讨论。通过使用这些参数，生理学相关的数据可以被收集并施加到受有丝分裂的缺陷数的疾病状态。

<table><tbody><tr><td>pCS2 vectors</td><td>Gift from K. Kwan</td><td></td><td>For plasmid of interest</td></tr><tr><td>NotI-HF restriction enzyme</td><td>New England BioLabs</td><td>R3189S</td><td>For restriction digest of plasmid</td></tr><tr><td>mMessage SP6 kit</td><td>Life Technologies</td><td>AM1340</td><td>For &lt;em&gt;in vitro&lt;/em&gt; transcription</td></tr><tr><td>RNeasy Mini kit</td><td>Qiagen</td><td>74104</td><td>For purifying mRNA</td></tr><tr><td>100 x 15 mm Petri dishes</td><td>Fisher Scientific</td><td>FB0875712</td><td>For housing embryos</td></tr><tr><td>microinjection mold</td><td>homemade</td><td></td><td>For holding embryos during microinjection</td></tr><tr><td>Agarose II</td><td>Amresco</td><td>0815-25G</td><td>For embedding embryos</td></tr><tr><td>Tricaine</td><td>Sigma-Aldrich</td><td>E10521-10G</td><td>For anesthetizing embryos</td></tr><tr><td>Sodium Chloride</td><td>Sigma-Aldrich</td><td>S9888</td><td>For embryo water (E3 Blue), dissolved in UltraPure H&lt;sub&gt;2&lt;/sub&gt;O</td></tr><tr><td>Potassium Chloride</td><td>Sigma-Aldrich</td><td>P3911</td><td>For embryo water (E3 Blue), dissolved in UltraPure H&lt;sub&gt;2&lt;/sub&gt;O</td></tr><tr><td>Calcium Chloride Dihydrate</td><td>Sigma-Aldrich</td><td>C8106</td><td>For embryo water (E3 Blue), dissolved in UltraPure H&lt;sub&gt;2&lt;/sub&gt;O</td></tr><tr><td>Magnesium Sulfate</td><td>Fisher Scientific</td><td>M7506</td><td>For embryo water (E3 Blue), dissolved in UltraPure H&lt;sub&gt;2&lt;/sub&gt;O</td></tr><tr><td>Methylene Blue Hydrate</td><td>Sigma-Aldrich</td><td>MB1</td><td>For embryo water (E3 Blue), dissolved in UltraPure H&lt;sub&gt;2&lt;/sub&gt;O</td></tr><tr><td>100 mm culture tube</td><td>Fisher Scientific</td><td>50-819-812</td><td>For melted agar</td></tr><tr><td>35 mm glass coverslip bottom culture dish&amp;nbsp;</td><td>MatTek Corp</td><td>P35G-0-20-C&amp;nbsp;</td><td>No. 0, 20 mm glass, For embedding embryos</td></tr><tr><td>#5 tweezers</td><td>Dumont</td><td>72701-D</td><td>For dechorionating embryos</td></tr><tr><td>21 G 1 1/2 gauge needle</td><td>Becton Dickinson</td><td>305167</td><td>For positioning embryos in agar</td></tr><tr><td>Dissecting microscope</td><td>Nikon AZ100</td><td></td><td>For screening and embedding embryos, any dissecting scope will do</td></tr><tr><td>Confocal microscope</td><td>Nikon A1+</td><td></td><td>For time-lapse imaging</td></tr><tr><td>Confocal software</td><td>NIS Elements AR 4.13.00</td><td></td><td>For image acquisition and processing</td></tr></tbody></table>

observing mitotic division and dynamics in a live zebrafish embryo

有丝分裂为有机体的生长和分化至关重要。这个过程是高度动态的，需要有序的事件来完成适当的染色质凝聚，微管连接着丝粒，染色体分离和胞质分裂在小时间框架。在微妙的过程中的错误可能导致人类疾病，包括出生缺陷和癌症。传统的方法研究人类疾病的有丝分裂状态往往依赖于细胞培养系统，研究人类疾病时，缺乏自然的生理和发育/组织特异性环境有利。该协议提供了一种可视化，高分辨率，在脊椎动物系统染色体动态，斑马鱼克服许多障碍。该协议将详细可用于获得分裂的细胞，其包括的动态图像的方法: 在体外转录，斑马鱼养殖/收集，胚胎嵌入，和延时成像。优化和改性的该协议的ications进行了探讨。使用H2A.F / Z-EGFP（标签染色质）和mCherry-CAAX（标签细胞膜）的mRNA注射的胚胎，有丝分裂在AB野生型，auroraB hi1045 和 esco2 hi2865突变斑马鱼被可视化。在斑马鱼高分辨率实时成像允许一个观察多个核分裂进行统计量化有丝分裂的缺陷和有丝分裂进程的时机。此外，定义不当的有丝分裂过程（ 即，板集合缺陷，染色体missegregation 等 ）和不适当的染色体的结果（ 即，非整倍体，多倍体，微核等 ）质量方面观察被观察。该测定可用于组织分化/发展的观察，是适合于使用突变斑马鱼和药理学试剂的。在有丝分裂的缺陷如何导致癌症和发育障碍将极大地可视化提高疾病的发病机理的理解。

图2显示，观察使用AB野生型斑马鱼尾巴的宽视场多细胞分裂的能力。超过七有丝分裂细胞成像在14分钟的时间内（ 电影1）。在两个小时的时间，当然，超过40的有丝分裂事件被抓获。平均来说，在AB观察50分裂的细胞，并在AUR B M /米胚（ 图2B）30分裂的细胞。考虑到成像单元的数量，有丝分裂的细胞，以成像的计?...

Watch this Scientific Journal Video about Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo at JoVE.com

Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo

Mitosis is critical to every living organism and defects often lead to cancer and developmental disorders. Using this imaging protocol and zebrafish as a model system, researchers can visualize mitosis in a live vertebrate organism and the multitude of defects that arise when mitotic processes are defective.

观察有丝分裂和动力学在现场斑马鱼胚胎

Mitosis is critical for organismal growth and differentiation. The process is highly dynamic and requires ordered events to accomplish proper chromatin ...

observing-mitotic-division-and-dynamics-in-a-live-zebrafish-embryo

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12.0K 次观看.  University of Alabama at Birmingham. Mitosis is critical to every living organism and defects often lead to cancer and developmental disorders. Using this imaging protocol and zebrafish as a model system, researchers can visualize mitosis in a live vertebrate organism and the multitude of defects that arise when mitotic processes are defective.

视频: Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo

Capturing Tissue Repair in Zebrafish Larvae with Time-lapse Brightfield Stereomicroscopy

The zebrafish larval tail fin is ideal for studying tissue regeneration due to the simple architecture of the larval fin-fold, which comprises of two layers of skin that enclose undifferentiated mesenchyme, and because the larval tail fin regenerates rapidly within 2-3 days. Using this system, we demonstrate a method for capturing the repair dynamics of the amputated tail fin with time-lapse video brightfield stereomicroscopy. We demonstrate that fin amputation triggers a contraction of the amputation wound and extrusion of cells around the wound margin, leading to their subsequent clearance. Fin regeneration proceeds from proximal to distal direction after a short delay. In addition, developmental growth of the larva can be observed during all stages. The presented method provides an opportunity for observing and analyzing whole tissue-scale behaviors such as fin development and growth in a simple microscope setting, which is easily adaptable to any stereomicroscope with time-lapse capabilities.

We present a protocol for capturing the dynamics of zebrafish larval tail fin regeneration on a whole-tissue scale using brightfield-based stereomicroscopy. This technique enables capturing the regeneration dynamics with single cell resolution. This methodology can be adapted to any stereomicroscope equipped with a CCD camera and time-lapse software.

捕获组织修复的斑马鱼幼虫与时间推移明视立体显微镜

The zebrafish larval tail fin is ideal for studying tissue regeneration due to the simple architecture of the larval fin-fold, which comprises of two ...

科研

发育生物学

Profiling DNA Replication Timing Using Zebrafish as an In Vivo Model System

DNA replication timing is an important cellular characteristic, exhibiting significant relationships with chromatin structure, transcription, and DNA mutation rates. Changes in replication timing occur during development and in cancer, but the role replication timing plays in development and disease is not known. Zebrafish were recently established as an in vivo model system to study replication timing. Here is detailed the protocols for using the zebrafish to determine DNA replication timing. After sorting cells from embryos and adult zebrafish, high-resolution genome-wide DNA replication timing patterns can be constructed by determining changes in DNA copy number through analysis of next generation sequencing data. The zebrafish model system allows for evaluation of the replication timing changes that occur in vivo throughout development, and can also be used to assess changes in individual cell types, disease models, or mutant lines. These methods will enable studies investigating the mechanisms and determinants of replication timing establishment and maintenance during development, the role replication timing plays in mutations and tumorigenesis, and the effects of perturbing replication timing on development and disease.

Profiling DNA Replication Timing Using Zebrafish as an In Vivo Model System

Zebrafish were recently used as an in vivo model system to study DNA replication timing during development. Here is detailed the protocols for using zebrafish embryos to profile replication timing. This protocol can be easily adapted to study replication timing in mutants, individual cell types, disease models, and other species.

使用斑马鱼作为体内模型系统分析 DNA 复制定时

DNA replication timing is an important cellular characteristic, exhibiting significant relationships with chromatin structure, transcription, and DNA ...

遗传学

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

Manipulation of ploidy allows for useful transformations, such as diploids to tetraploids, or haploids to diploids. In the zebrafish Danio rerio, specifically the generation of homozygous gynogenetic diploids is useful in genetic analysis because it allows the direct production of homozygotes from a single heterozygous mother. This article describes a modified protocol for ploidy duplication based on a heat pulse during the first cell cycle, Heat Shock 2 (HS2). Through inhibition of centriole duplication, this method results in a precise cell division stall during the second cell cycle. The precise one-cycle division stall, coupled to unaffected DNA duplication, results in whole genome duplication. Protocols associated with this method include egg and sperm collection, UV treatment of sperm, in vitro fertilization and heat pulse to cause a one-cell cycle division delay and ploidy duplication. A modified version of this protocol could be applied to induce ploidy changes in other animal species.

A modified protocol for ploidy manipulation uses a heat shock to induce a one-cycle stall in cytokinesis in the early embryo. This protocol is demonstrated in the zebrafish but may be applicable to other species.

斑马鱼胚胎的倍性操作与热休克治疗2

Manipulation of ploidy allows for useful transformations, such as diploids to tetraploids, or haploids to diploids. In the zebrafish Danio rerio, ...

A Versatile Mounting Method for Long Term Imaging of Zebrafish Development

Zebrafish embryos offer an ideal experimental system to study complex morphogenetic processes due to their ease of accessibility and optical transparency. In particular, posterior body elongation is an essential process in embryonic development by which multiple tissue deformations act together to direct the formation of a large part of the body axis. In order to observe this process by long-term time-lapse imaging it is necessary to utilize a mounting technique that allows sufficient support to maintain samples in the correct orientation during transfer to the microscope and acquisition. In addition, the mounting must also provide sufficient freedom of movement for the outgrowth of the posterior body region without affecting its normal development. Finally, there must be a certain degree in versatility of the mounting method to allow imaging on diverse imaging set-ups. Here, we present a mounting technique for imaging the development of posterior body elongation in the zebrafish D. rerio. This technique involves mounting embryos such that the head and yolk sac regions are almost entirely included in agarose, while leaving out the posterior body region to elongate and develop normally. We will show how this can be adapted for upright, inverted and vertical light-sheet microscopy set-ups. While this protocol focuses on mounting embryos for imaging for the posterior body, it could easily be adapted for the live imaging of multiple aspects of zebrafish development.

Here, we present a versatile mounting method that allows for the long-term time-lapse imaging of the posterior body development of live zebrafish embryos without perturbing normal development.

斑马鱼发展长期成像的多功能安装方法

Zebrafish embryos offer an ideal experimental system to study complex morphogenetic processes due to their ease of accessibility and optical transparency. ...

Live Imaging of the Zebrafish Embryonic Brain by Confocal Microscopy

In this video, we demonstrate the method our lab has developed to analyze the cell shape changes and rearrangements required to bend and fold the developing zebrafish brain (Gutzman et al, 2008). Such analysis affords a new understanding of the underlying cell biology required for development of the 3D structure of the vertebrate brain, and significantly increases our ability to study neural tube morphogenesis. The embryonic zebrafish brain is shaped beginning at 18 hours post fertilization (hpf) as the ventricles within the neuroepithelium inflate. By 24 hpf, the initial steps of neural tube morphogenesis are complete. Using the method described here, embryos at the one cell stage are injected with mRNA encoding membrane-targeted green fluorescent protein (memGFP). After injection and incubation, the embryo, now between 18 and 24 hpf, is mounted, inverted, in agarose and imaged by confocal microscopy. Notably, the zebrafish embryo is transparent making it an ideal system for fluorescent imaging. While our analyses have focused on the midbrain-hindbrain boundary and the hindbrain, this method could be extended for analysis of any region in the zebrafish to a depth of 
80-100 &mu;m.

In this video, we demonstrate a method by which to analyze the developing vertebrate brain in live zebrafish embryos at single cell resolution by confocal microscopy. This includes the method by which we inject the single-cell zebrafish embryo and subsequently mount and image the developing brain.

现场共聚焦显微镜对斑马鱼的胚胎脑成像

In this video, we demonstrate the method our lab has developed to analyze the cell shape changes and rearrangements required to bend and fold the ...

生物学

Visualization of Cellular Electrical Activity in Zebrafish Early Embryos and Tumors

Bioelectricity, endogenous electrical signaling mediated by ion channels and pumps located on the cell membrane, plays important roles in signaling processes of excitable neuronal and muscular cells and many other biological processes, such as embryonic developmental patterning. However, there is a need for in vivo electrical activity monitoring in vertebrate embryogenesis. The advances of genetically encoded fluorescent voltage indicators (GEVIs) have made it possible to provide a solution for this challenge. Here, we describe how to create a transgenic voltage indicator zebrafish using the established voltage indicator, ASAP1 (Accelerated Sensor of Action Potentials 1), as an example. The Tol2 kit and a ubiquitous zebrafish promoter, ubi, were chosen in this study. We also explain&#160;the processes of Gateway site-specific cloning, Tol2 transposon-based zebrafish transgenesis, and the imaging process for early-stage fish embryos and fish tumors using regular epifluorescent microscopes. Using this fish line, we found that there are cellular electric voltage changes during zebrafish embryogenesis, and fish larval movement. Furthermore, it was observed that in a few zebrafish malignant peripheral nerve sheath tumors, the tumor cells were generally polarized compared to the surrounding normal tissues.

Here, we show the process of creating a cellular electric voltage reporter zebrafish line to visualize embryonic development, movement, and fish tumor cells in vivo.

斑马鱼早期胚胎和肿瘤细胞电活动的可视化研究

Bioelectricity, endogenous electrical signaling mediated by ion channels and pumps located on the cell membrane, plays important roles in signaling ...

Dissection and Lateral Mounting of Zebrafish Embryos: Analysis of Spinal Cord Development

The zebrafish spinal cord is an effective investigative model for nervous system research for several reasons. First, genetic, transgenic and gene knockdown approaches can be utilized to examine the molecular mechanisms underlying nervous system development. Second, large clutches of developmentally synchronized embryos provide large experimental sample sizes. Third, the optical clarity of the zebrafish embryo permits researchers to visualize progenitor, glial, and neuronal populations. Although zebrafish embryos are transparent, specimen thickness can impede effective microscopic visualization. One reason for this is the tandem development of the spinal cord and overlying somite tissue. Another reason is the large yolk ball, which is still present during periods of early neurogenesis. In this article, we demonstrate microdissection and removal of the yolk in fixed embryos, which allows microscopic visualization while preserving surrounding somite tissue. We also demonstrate semipermanent mounting of zebrafish embryos. This permits observation of neurodevelopment in the dorso-ventral and anterior-posterior axes, as it preserves the three-dimensionality of the tissue.

Developmental processes such as proliferation, patterning, differentiation, and axon guidance can be readily modeled in the zebrafish spinal cord. In this article, we describe a mounting procedure for zebrafish embryos, which optimizes visualization of these events.

解剖和斑马鱼的胚胎横向安装：脊髓发展分析

The zebrafish spinal cord is an effective investigative model for nervous system research for several reasons. First, genetic, transgenic and gene ...

神经科学

<meta charset="utf8"></head><body>斑马鱼胚胎的精细多视图光片显微镜实验方案

Light Sheet Microscopy Imaging and Mounting Strategies for Early Zebrafish Embryos

Light sheet microscopy has become the methodology of choice for live imaging of zebrafish embryos over long time scales with minimal phototoxicity. In particular, a multiview system, which allows sample rotation, enables imaging of entire embryos from different angles. However, in most imaging sessions with a multiview system, sample mounting is a troublesome process as samples are usually prepared in a polymer tube. To aid in this process, this protocol describes basic mounting strategies for imaging early zebrafish development between the 70% epiboly and early somite stages. Specifically, the study provides statistics on the various positions the embryos default to at the 70% epiboly and bud stages within the chorion. Furthermore, it discusses the optimum number of angles and the interval between angles required for imaging whole zebrafish embryos at the early stages of development so that cellular-scale information can be extracted by fusing the different views. Finally, since the embryo covers the entire field of view of the camera, which is required to obtain a cellular-scale resolution, this protocol details the process of using bead information from above or below the embryo for the registration of the different views.

<meta charset="utf8"></head><body>作者聚焦:用于高分辨率多视图光片显微镜的斑马鱼胚胎安装策略 — 成像和图像重建技术

A sample preparation strategy for imaging early zebrafish embryos within an intact chorion using a light-sheet microscope is described. It analyzes the different orientations that embryos acquire within the chorion at the 70% epiboly and bud stages and details imaging strategies for obtaining cellular-scale resolution throughout the embryo using the light-sheet system.

早期斑马鱼胚胎的光片显微镜成像和安装策略

Light sheet microscopy has become the methodology of choice for live imaging of zebrafish embryos over long time scales with minimal phototoxicity. In ...

观察有丝分裂和动力学在现场斑马鱼胚胎

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此视频中的章节

捕获组织修复的斑马鱼幼虫与时间推移明视立体显微镜

使用斑马鱼作为体内模型系统分析 DNA 复制定时

斑马鱼胚胎的倍性操作与热休克治疗2

斑马鱼发展长期成像的多功能安装方法

现场共聚焦显微镜对斑马鱼的胚胎脑成像

斑马鱼早期胚胎和肿瘤细胞电活动的可视化研究

解剖和斑马鱼的胚胎横向安装：脊髓发展分析

早期斑马鱼胚胎的光片显微镜成像和安装策略

早期斑马鱼胚胎的光片显微镜成像和安装策略

早期斑马鱼胚胎的光片显微镜成像和安装策略