CN117143876A - 一种半滑舌鳎小rna及其应用 - Google Patents
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Abstract
本发明涉及RNA干扰领域,具体涉及一种干扰半滑舌鳎rnf34基因的siRNA及其应用;具体而言,本发明提供了一种优化的siRNA,该siRNA成功干扰半滑舌鳎rnf34基因,对研究半滑舌鳎性别分化相关基因功能和开发性别控制技术具有重要意义。
Description
技术领域
本发明涉及RNA干扰领域,具体涉及一种半滑舌鳎小RNA及其应用。
背景技术
半滑舌鳎(Cynoglossussemilaevis)是比目鱼的一种,属于舌鳎科,舌鳎属,是东北亚地区重要的海水养殖鱼类。半滑舌鳎以其肉质鲜美,口感爽滑而深受消费者喜爱,成为海水养殖鱼类中的名贵品种。半滑舌鳎存在明显的雌、雄生长差异,雌鱼生长可比雄鱼大2-4倍,因此养殖中提高雌鱼比例对于产量提升具有重要意义。半滑舌鳎属于ZW性别决定类型,即理论上讲,ZW基因型将发育为雌鱼,ZZ型发育成雄鱼。然而在实际生产中,有相当一部分的ZW个体会性逆转为“伪雄鱼”,由于伪雄鱼生长和雄鱼相似,这极大限制了舌鳎产业的发展。
基因在性别分化过程中发挥重要作用,通过调控基因表达是实现性别控制的重要手段。尽管基因编辑技术在半滑舌鳎中已经成功应用,但显微注射后成活率低、获得纯合体周期长(性成熟周期:雄鱼1年,雌鱼2年)等困难限制了其应用,相比而言,体内RNA干扰省时、经济,更适合研究基因功能和实现基因调控,但如何高效筛选有效的小RNA是关键。我们前期通过转录组等分析,发现一个位于Z染色体上的rnf34基因与雄性分化密切相关,以rnf34为对象设计多对siRNA,首先通过半滑舌鳎精巢细胞系筛选敲降效果好的siRNA,进而在雄鱼活体中进行验证,获得较好的敲降效果。
该方法极大优化了筛选流程,在半滑舌鳎发育早期建立有效的RNA干扰技术,能有效缩短研究周期,尽快获得相关表型,对研究性别分化相关基因功能和开发性别控制技术具有重要意义。
发明内容
本发明提供了一种干扰半滑舌鳎rnf34基因的siRNA及其应用。
一方面,本发明提供了一种干扰半滑舌鳎rnf34基因的siRNA,
所述siRNA的正义链的序列为:5’gcacccagugcuggauauutt3’,
所述siRNA的反义链的序列为:5’aauauccagcacugggugctt3’。
“siRNA(小干扰RNA,短干扰RNA或沉默RNA)”是一种短的双链RNA,人工引入细胞以诱导特定基因mRNA的降解,从而阻止蛋白质翻译并导致RNA抑制基因表达的干扰。
进一步的,所述siRNA的末端还含有dTdT的结构,优选的,在siRNA的3’端含有dTdT的结构。
另一方面,本发明还提供了包含上述siRNA的生物制剂。
在一个实施方式中,所述生物制剂选自载体,优选的,所述载体包括病毒、脂质体。
另一方面,本发明还提供了上述siRNA或生物制剂在干扰半滑舌鳎rnf34基因中的应用。
本发明中的干扰表现为可以降低或敲低或抑制所述基因的表达。
上述rnf34基因记载在NCBI(https://www.ncbi.nlm.nih.gov/gene/103398329),Gene ID:103398329,转录本为NCBI Reference Sequence:XM_025053151.1。
另一方面,本发明还提供了一种干扰半滑舌鳎rnf34基因的方法,所述方法包括利用上述siRNA或生物制剂对半滑舌鳎rnf34基因进行干扰的步骤。
另一方面,本发明还提供了上述siRNA在制备用于干扰半滑舌鳎rnf34基因的试剂、组合物、生物制剂或试剂盒中的用途。
在一个实施方式中,上述siRNA干扰半滑舌鳎精巢中rnf34基因的表达。
附图说明
图1.不同siRNA转染半滑舌鳎精巢细胞系后rnf34的表达量(*表示显著性差异,p<0.05)。
图2.半滑舌鳎精巢注射rnf34si1后rnf34的表达量(**表示显著性差异,p<0.01)。
实施方式
下面结合实施例对本发明做进一步的说明,以下所述,仅是对本发明的较佳实施例而已,并非对本发明做其他形式的限制,任何熟悉本专业的技术人员可能利用上述揭示的技术内容加以变更为同等变化的等效实施例。凡是未脱离本发明方案内容,依据本发明的技术实质对以下实施例所做的任何简单修改或等同变化,均落在本发明的保护范围内。
根据序列和前期结果,设计了针对半滑舌鳎rnf34基因(Gene ID:103398329,转录本为NCBI Reference Sequence:XM_025053151.1)的三对特异性siRNAs(rnf34si1,rnf34si2,rnf34si3),并以NC作为阴性对照,序列见表1。
表1.设计的siRNA序列
细胞系干扰步骤如下,复苏实验室建系成功的半滑舌鳎精巢细胞系后,在24℃培养箱中用配制10%胎牛血清(FBS),5ng/ml bFGF,5ng/ml EGF,27.5μmol/L beta-巯基乙醇及5%三抗的L-15培养基进行培养,待细胞长满培养瓶,进行传代培养。密度达到80%~90%时铺到12孔细胞培养板中。采用CP Regent转染试剂盒对已铺板的半滑舌鳎精巢细胞系进行siRNA干扰转染实验,除了设置转染三对特异性siRNAs敲降组外也设置了转染NC组作为阴性对照组。转染60h后通过检测si-cy3转染细胞的细胞状态和荧光作为转染效率检验,转染效率达到80%收取细胞进行RNA提取,反转录后通过定量PCR检测rnf34的表达量。
对于体内RNAi实验,具体信息包括:选取孵化后90天的舌鳎(体长9.47±1.50cm,体宽2.49±0.51cm,体重5.13±1.87g),用微量注射器将siRNA注射至精巢位置,注射分对照组(NC)和实验组(rnf34si1),siRNA的剂量为0.025nmol/g)。注射后72小时取性腺进行RNA提取,反转录后通过定量PCR检测rnf34的表达量(检测引物见表2)。
表2.用于定量PCR的检测引物
细胞系干扰结果如图1所示,经比较精巢细胞系的干扰结果,rnf34si1组有明显敲降效果,而rnf34si2和rnf34si3则与NC相同,没有显著性差异。选择rnf34si1进一步注射精巢进行干扰,检测rnf34的表达量,发现其表达水平显著下降,结果如图2所示。
虽然本发明已以较佳的实施例公开如上,但其并非用以限定本发明,在不脱离本发明精神和范围内,本领域技术人员都可以在此基础上做出各种改动与变型,因此,本发明的保护范围应该以权利要求书所界定的为准。
Claims (7)
1.一种干扰半滑舌鳎rnf34基因的siRNA,其特征在于,
所述siRNA的正义链的序列为:5’gcacccagugcuggauauutt3’,
所述siRNA的反义链的序列为:5’aauauccagcacugggugctt3’。
2.根据权利要求1所述的siRNA,其特征在于,所述siRNA的末端还含有dTdT的结构。
3.根据权利要求2所述的siRNA,其特征在于,所述siRNA的3’端含有dTdT的结构。
4.包含权利要求1-3任一所述的siRNA的生物制剂。
5.权利要求1-3任一所述的siRNA或权利要求4所述的生物制剂在干扰半滑舌鳎rnf34基因中的应用。
6.一种干扰半滑舌鳎rnf34基因的方法,所述方法包括利用权利要求1-3任一所述的siRNA或权利要求4所述的生物制剂对半滑舌鳎rnf34基因进行干扰的步骤。
7.权利要求1-3任一所述的siRNA在制备用于干扰半滑舌鳎rnf34基因的试剂、组合物、生物制剂或试剂盒中的用途。
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