癌变·畸变·突变 ›› 2019, Vol. 31 ›› Issue (4): 276-282.doi: 10.3969/j.issn.1004-616x.2019.04.003

• 论著 • 上一篇    下一篇

RNR3启动子调控的红绿荧光蛋白双信号发光酵母细胞对化学诱变原的筛选

姚佳1,2, 刘星1, 卢光玉1, 朱方渝1, 吴倩倩3, 李湘鸣1   

  1. 1. 扬州大学医学院, 江苏 扬州 225001;
    2. 扬州市卫生监督所, 江苏 扬州 225002;
    3. 苏州市相城人民医院, 江苏 苏州 215100
  • 收稿日期:2019-02-17 修回日期:2019-06-18 出版日期:2019-07-30 发布日期:2019-08-23
  • 通讯作者: 李湘鸣,E-mail:847264344@qq.com E-mail:847264344@qq.com
  • 作者简介:姚佳,E-mail:ajia0922@163.com。
  • 基金资助:
    国家自然科学基金资助(81241099)

Screening of chemical mutagens based on RNR3 romoter-regulated red-green fluorescent protein dual signals in yeast cells

YAO Jia1,2, LIU Xing1, LU Guangyu1, ZHU Fangyu1, WU Qianqian3, LI Xiangming1   

  1. 1. Medical College of Yangzhou University, Yangzhou 225001;
    2. Yangzhou Health Supervision Institute, Yangzhou 225002;
    3. Xiangcheng People's Hospital, Suzhou 215100, Jiangsu, China
  • Received:2019-02-17 Revised:2019-06-18 Online:2019-07-30 Published:2019-08-23

摘要: 目的:构建RNR3启动子调控的红绿荧光蛋白双信号发光酵母细胞,用于快速筛选化学诱变原。方法:用PCR方法YIPlac204TC-NLS-DsRed-Express-2扩增DsRed-Express-2红色荧光蛋白,将其插入到pGPD载体,构建成GPD启动子驱动的红色荧光蛋白酵母报告载体(pGPD-DsRed-Express2),用醋酸锂方法将其转化于RNR3启动子调控的绿色荧光蛋白(yEGFP)发光酵母细胞(W303-1A/RNR3-yEGFP),从而构建成红、绿荧光蛋白双信发光酵母细胞。红色荧光蛋白(DsRed-Express-2)信号可用于校正细胞数和状态不同对yEGFP发光的影响。用不同诱变原分别作用于该发光酵母细胞,于第0、4、8、12、16和20小时,用黑色96孔酶标板分别测红、绿荧光蛋白的发光强度,用相对荧光强度(yEGFP/DsRed-Express2)描述诱变原的剂量效应关系。结果:在与DNA发生结合的化合物中,放线菌素D和溴乙锭均呈阴性;在与DNA发生烷基化的化合物中,甲磺酸甲脂(MMS)和瘤可宁呈阳性结果,而丝裂霉素C呈阴性结果;在使DNA发生断裂的诱变原中,顺铂、博来霉素和福来霉素呈阴性,而4-硝基-N-氧化喹啉(4-NQO)呈阳性结果;在抑制DNA合成酶或拓扑异构酶的诱变原中,5-氟尿嘧啶呈阳性结果,而羟基脲、喜树碱和阿非迪霉素均呈阴性结果;非基因毒性化合物秋水仙碱、刀豆氨酸和四环素均呈阴性。结论:该重组发光酵母细胞(W303-1A/yEGFP/DsRed-Express2)可作为传统致突变评价方法的补充,具有快速、方便和高通量特点。

关键词: 酵母细胞, 诱变原, 绿色荧光蛋白, 红色荧光蛋白

Abstract: OBJECTIVE:To construct red-green fluorescent protein dual signals which are regulated by RNR3 promoter in yeast cells for rapid screening of chemical mutagens. METHODS:DsRed-Express-2 red fluorescent protein was amplified by PCR from YIPlac204TC-NLS-DsRed-Express-2 and inserted into pGPD vector to construct a yeast red fluorescent protein reporter vector (pGPD-DsRed-Express2),which was driven by the GPD promoter. The method of lithium acetate was used to transform the vector into green fluorescent protein (yEGFP) cells (W303-1A/RNR3-yEGFP),which was regulated by the RNR3 promoter. Thus,red and green fluorescent protein dual signal fluorescing yeast cells were constructed. Red fluorescent protein (DsRed-Express-2) signal was used to normalize the effect of different cell numbers and the "states" on the fluorescence of yEGFP. Fluorescent intensity of red and green fluorescent proteins was measured in 96-well black microplate at 0,4,8,12,16 and 20 hours after the cells were treated with different mutagens. The relative fluorescence intensity (yEGFP/DsRed-Express2) was used to describe the dose-effect relationship between the mutagens and the cells. RESULTS:Actinomycin D and ethidium bromide exhibited negative results among DNA intercalating compounds;methyl mesylate (MMS) and chlorambucil were positive among DNA-alkylating compounds,while mitomycin C was negative;cisplatin,bleomycin and fleomycin were negative among DNA cleaving agents,while 4-nitro-N-oxyquinoline (4-NQO) was negative. Among the inhibitors of polymerases or topoisomerases,5-fluorouracil appeared positive,while hydroxyurea,camptothecin and aphidicolin were negative. As for non-genotoxic compounds such as colchicine,concanavaline and tetracycline,all of them exhibited negative results. CONCLUSION:The recombinant dual-signal fluorescent yeast cells (W303-1A/yEGFP/DsRed-Express2) can possibly be used as a complement to the traditional mutagenic assays,and have the characteristics of fast,convenience and high throughput.

Key words: yeast cells, mutagens, green fluorescent protein, red fluorescent protein

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