CN105353126B - 一种唇癌特异性检测的试剂盒 - Google Patents

一种唇癌特异性检测的试剂盒 Download PDF

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CN105353126B
CN105353126B CN201510775706.XA CN201510775706A CN105353126B CN 105353126 B CN105353126 B CN 105353126B CN 201510775706 A CN201510775706 A CN 201510775706A CN 105353126 B CN105353126 B CN 105353126B
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crisp1
aptamer
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lip cancer
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陈博
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Guangzhou Egene Biotechnology Co ltd
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Abstract

本发明公开了一种特异性检测唇癌的试剂盒。本发明提供的核酸适体,与人富含半脫氨酸分泌蛋白1具有较好的亲和能力。利用本发明的核酸适体,可以捕获唾液中的富含半脫氨酸分泌蛋白1蛋白,通过其含量的变化来检测唇癌,将其制备成为相应的试剂盒,将用于唇癌的筛查。利用本发明的试剂盒,具有高灵敏、成本低的好处。

Description

一种唇癌特异性检测的试剂盒
技术领域
本发明涉及一种用于检测唇癌的试剂盒及其检测方法。
背景技术
唇癌是指发生于上下口唇的恶性肿瘤为口腔常见恶性肿瘤之一,在口腔癌中占第立位,占全身恶性肿瘤的0. 1 %〜0.5%,占口腔恶性肿瘤的7. 1 %〜15.0%,欧美国家唇癌患者较多,占口腔癌的20 %〜30 %。一般下唇比上唇易受累,约90 %〜95 %发生在下唇红缘部,而且W下唇的外1 / 3处为多见。男性患者居多,男女之比为7:1。高发年龄为50〜70岁。唇癌绝大多数为高分化之鱗状细胞癌,多在良性费生物的病变基础上发生,其生长速 度较慢,预后较好,一般5年生存率为70 % W上,本病的病因可能与局部长期受异物刺激,强烈的紫外线照射有关。口唇上皮角化、白斑、巧费、肉芽肿及裂口等长期不愈,亦可导致癌变。
现有技术已知,唾液富含半脫氨酸分泌蛋白1浓度为10-40ng即可诊断为唇癌。因此,检测半脫氨酸分泌蛋白1的浓度变得极为重要。
核酸适体(Aptamer,又称适配体,适配子)是能高亲和性、高特异性的结合某种生物革El标的单链寡核酸分子(ssDNA或ssRNA)。核酸适体是通过指数富集配体系统进化技术(Systemat1c Evolut1on of L1gands by Exponent1al enr1chment, SELEX)从人工合成的DNA/RNA文库中筛选得到的能够高度特异性结合靶标分子的单链DNA/RNA。已报道核酸适体的靶标包括金属离子、有机小分子、多肽、蛋白质、细胞甚至组织等。核酸适体的分子识别功能与抗体类似,具有与抗体分子相当甚至更强的靶标识别能力,但与抗体相比具有很多优良的特性,如分子量小,能批量生产,不易失活,无免疫原性、容易合成与标记、快速的穿透组织、良好的代谢动力学、不同批次之间产品不会存在差异和具有很好化学稳定性,在生物检测、疾病诊断治疗等领域具有重要的应用前景。
发明内容
本发明的目的是提供一种特异结合CRISP1的核酸适体及其试剂盒。
本发明提供的核酸适体,是序列表的序列1-15所示的单链DNA。
所述核酸适体与CRISP1蛋白具有较好的亲和能力。
还可将所述核酸适体进行修饰或改造,得到所述核酸适体的衍生物。
所述核酸适体的衍生物可为如下任意一种:
a)将所述核酸适体删除部分或增加部分互补的核苷酸,得到的与所述核酸适体具有相同功能的核酸适体的衍生物;
b)将所述核酸适体进行核苷酸取代或部分修饰,得到的与所述核酸适体具有相同功能的核酸适体的衍生物;
c)将所述核酸适体的骨架改造为硫代磷酸酯骨架,得到的与所述核酸适体具有相同功能的核酸适体的衍生物;
d)将核酸适体改造为肽核酸,得到的与所述核酸适体具有相同功能的核酸适体的衍生物;
e)将所述核酸适体连接上荧光、放射性和治疗性物质后,得到的与所述核酸适体具有相同功能的核酸适体的衍生物。
所述核酸适体可用于制备检测CRISP1的试剂盒。
利用本发明的核酸适体,可以捕获中唾液中的中的CRISP1,从而用于相关口腔癌筛查。利用本发明的核酸适体,具有高灵敏、成本低、易制备、易保存的优点。本发明具有很高的应用价值。
具体实施方式
以下的实施例便于更好地理解本发明,但并不限定本发明。下述实施例中的实验方法,如无特殊说明,均为常规方法。
实施例1、CRISP1蛋白的获得
将Genbank:EAX04350 所示的CRISP1基因通过本领域常规的真核表达方式进行表达,获得了相应的目的多肽蛋白。
实施例2 核酸适体的筛选和制备
设计两端包含大约20个核苷酸、中间包括41个核苷酸的随机核酸文库如下:
5‘-TGGCACCTACGATCTAAGGCA(N41)GGACTACCAATGCAACGTCAC -3’;N41代表 41 个随机核苷酸。
将单链DNA文库扩增为双链DNA,产物经2%琼脂糖凝胶电泳并切胶回收纯化;以回收的双链DNA为模板,体外转录出单链RNA随机文库,转录产物经PAGE纯化。75 μg RNA文库经硝酸纤维素膜反筛去除与膜结合的RNA 分子,然后与2ug CRISP1蛋白,37°C孵育30min,反应液经硝酸纤维素膜滤过,洗涤滤膜;然后将滤膜剪碎,置于洗脱缓冲液(6mol/L尿素,0.55mol/L醋酸铵,l.5mmol/L EDTA,0. 15% SDS)中煮沸5min,离心,取上清,无水乙醇沉淀RNA,并重新溶解于20 μ1 DEPC水中;以RNA为模板 RT-PCR扩增双链DNA,体外转录出RNA文库用于下一轮筛选;每轮筛选过程中RT-PCR得到双链DNA文库,以该双链DNA为模板体外转录出RNA适配子库,筛选共进行12轮。得到了15个适配子,其序列分别为SEQ ID NO:1-15所示。具体序列如下所示:
CRISP1-1:TGGCACCTACGATCTAAGGCAATCCCATATATGTTCCACACACTCGCAACTTATCCGCTACA GGACTACCAATGCAACGTCAC
CRISP1-2:TGGCACCTACGATCTAAGGCATTCCGCCATAAATAAGATTCACATCACGACATCGATCACAC GGACTACCAATGCAACGTCAC
CRISP1-3:TGGCACCTACGATCTAAGGCACTTAATCAACATATCTCTTCTGTATTCTCTCCACGCATACA GGACTACCAATGCAACGTCAC
CRISP1-4:TGGCACCTACGATCTAAGGCAACGTCTCCAATCCGCACTTATAATTATGTTCTTACCTAAGA GGACTACCAATGCAACGTCAC
CRISP1-5:TGGCACCTACGATCTAAGGCACGCTCATCACCATCTCCTACCTATATACATCACCTTCGCCT GGACTACCAATGCAACGTCAC
CRISP1-6:TGGCACCTACGATCTAAGGCACATATCATCCTCCATACACGACCAACCACTCCGTCTTCACT GGACTACCAATGCAACGTCAC
CRISP1-7:TGGCACCTACGATCTAAGGCAAACAAACACTCTCGCACATTACCTTATTTATCAAGAATATA GGACTACCAATGCAACGTCAC
CRISP1-8:TGGCACCTACGATCTAAGGCACCGCTTATCTACACTAAATACAATTTCCTCCTCACCCTCCA GGACTACCAATGCAACGTCAC
CRISP1-9:TGGCACCTACGATCTAAGGCACACGCCTCCAATATCAACTTAATAATACACCACTAATTTCT GGACTACCAATGCAACGTCAC
CRISP1-10:TGGCACCTACGATCTAAGGCACACACGCCACTTATACAACAATCCAACCGCCTACCACTACT GGACTACCAATGCAACGTCAC
CRISP1-11:TGGCACCTACGATCTAAGGCATAGCATCACTACTCGCTATTTCCTATAATCCTAGCCTTATA GGACTACCAATGCAACGTCAC
CRISP1-12:TGGCACCTACGATCTAAGGCACTAGAAACTCCAACACATACACACACAGACCCGCTCCATAA GGACTACCAATGCAACGTCAC
CRISP1-13:TGGCACCTACGATCTAAGGCATCGCATAACGCTCCACAATATTAACATACTTCTCTTCTTAT GGACTACCAATGCAACGTCAC
CRISP1-14:TGGCACCTACGATCTAAGGCATCATAATATTCGCTCACTCTAATCATACATTATCTTCTTGT GGACTACCAATGCAACGTCAC
CRISP1-15:TGGCACCTACGATCTAAGGCAATAATATTCGCTCACTATAATCAACATTATCTTCTTGTTCT GGACTACCAATGCAACGTCAC
实施例3 蛋白结合适配子的性能测定
将适配子分别取2.0μ g,用牛小肠碱性磷酸酶(CIP) 37°C 消化lh,纯化回收去磷酸化的RNA ;通过T4多核苷酸激酶标记[γ -32P]ATP于去磷酸化的 RNA分子末端。10nmol放射性标记的适配子分别与不同浓度(1-200nM)的CRISP1 37°C 孵育30min,各组反应液经硝酸纤维素膜滤过,洗涤滤膜,干燥滤膜,液闪计数仪测定滤膜上残留的放射量,同一样品平行做两次测定。计算各个适配子与目的蛋白的解离常数。结果如下:
名称 解离常数Kd(单位nM)
CRISP1-1 9.9
CRISP1 -2 9.7
CRISP1 -3 9.8
CRISP1 -4 9.6
CRISP1 -5 9.4
CRISP1 -6 9.3
CRISP1 -7 9.4
CRISP1 -8 9.6
CRISP1 -9 9.0
CRISP1 -10 9.7
CRISP1 -11 9.6
CRISP1 -12 9.7
CRISP1 -13 9.0
CRISP1 -14 8.9
CRISP1 -15 8.8
PBS空白对照 无结合能力
实施例4 所述适配子特异性分析以及稳定性分析
分别采用人血白蛋白,免疫血清球蛋白,霍乱弧菌VgrG3C蛋白,大肠杆菌外膜蛋白A, COCH蛋白,CRISP1蛋白,与15条适配子进行特异性检测,经过结合试验发现,这些适配子都不与这些蛋白相结合,而只与CRISP1蛋白结合保持较高的特异性。
将所述的适配子,取0.2ug,分别置于常温的血清、水溶液中,放置二周。通过RT-PCR检测,发现三周的放置其结构稳定,没有被降解。
实施例5 所述适配子疾病的诊断
取9个唇癌患者和3个正常人的唾液分泌物,使用生理盐水稀释,获得目标样本。
将15个偶联有标记的适配子分别与9个患者以及3个正常人的分泌物混合30min,通过生物素分离,定量分析其中的CRISP1蛋白的含量,通过分析发现,9个口腔癌患者中CRISP1蛋白的含量显著增加,超过了规定的阈值。达到了唇癌的诊断标准。由此可见,其诊断效果较好。
以上仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,凡在本发明的精神和原则之内所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
序列表
〈110〉陈博
〈120〉一种特异性诊断唇癌的试剂盒
〈160〉15
〈210〉1
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-1
TGGCACCTACGATCTAAGGCAATCCCATATATGTTCCACACACTCGCAACTTATCCGCTACAGGACTACCAATGCAACGTCAC
〈210〉2
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-2
TGGCACCTACGATCTAAGGCATTCCGCCATAAATAAGATTCACATCACGACATCGATCACACGGACTACCAATGCAACGTCAC
〈210〉3
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-3
TGGCACCTACGATCTAAGGCACTTAATCAACATATCTCTTCTGTATTCTCTCCACGCATACAGGACTACCAATGCAACGTCAC
〈210〉4
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-4
TGGCACCTACGATCTAAGGCAACGTCTCCAATCCGCACTTATAATTATGTTCTTACCTAAGAGGACTACCAATGCAACGTCAC
〈210〉5
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-5
TGGCACCTACGATCTAAGGCACGCTCATCACCATCTCCTACCTATATACATCACCTTCGCCTGGACTACCAATGCAACGTCAC
〈210〉6
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-6
TGGCACCTACGATCTAAGGCACATATCATCCTCCATACACGACCAACCACTCCGTCTTCACTGGACTACCAATGCAACGTCAC
〈210〉7
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-7
TGGCACCTACGATCTAAGGCAAACAAACACTCTCGCACATTACCTTATTTATCAAGAATATAGGACTACCAATGCAACGTCAC
〈210〉8
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-8
TGGCACCTACGATCTAAGGCACCGCTTATCTACACTAAATACAATTTCCTCCTCACCCTCCAGGACTACCAATGCAACGTCAC
〈210〉9
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-9
TGGCACCTACGATCTAAGGCACACGCCTCCAATATCAACTTAATAATACACCACTAATTTCTGGACTACCAATGCAACGTCAC
〈210〉10
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-10
TGGCACCTACGATCTAAGGCACACACGCCACTTATACAACAATCCAACCGCCTACCACTACTGGACTACCAATGCAACGTCAC
〈210〉11
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-11
TGGCACCTACGATCTAAGGCATAGCATCACTACTCGCTATTTCCTATAATCCTAGCCTTATAGGACTACCAATGCAACGTCAC
〈210〉12
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-12
TGGCACCTACGATCTAAGGCACTAGAAACTCCAACACATACACACACAGACCCGCTCCATAAGGACTACCAATGCAACGTCAC
〈210〉13
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-13
TGGCACCTACGATCTAAGGCATCGCATAACGCTCCACAATATTAACATACTTCTCTTCTTATGGACTACCAATGCAACGTCAC
〈210〉14
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-14
TGGCACCTACGATCTAAGGCATCATAATATTCGCTCACTCTAATCATACATTATCTTCTTGTGGACTACCAATGCAACGTCAC
〈210〉15
〈211〉 83
〈212〉DNA
〈213〉人工序列
〈400〉CRISP1-15
TGGCACCTACGATCTAAGGCAATAATATTCGCTCACTATAATCAACATTATCTTCTTGTTCTGGACTACCAATGCAACGTCAC

Claims (1)

1.一种用于唇癌检测的试剂盒,其含有能特异性与CRISP1蛋白特异性结合的核酸适体,所述核酸适体的序列如SEQ ID No:1所述。
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