CN112481272A - Nova1促smn2外显子7列入的验证方法及其应用 - Google Patents
Nova1促smn2外显子7列入的验证方法及其应用 Download PDFInfo
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- CN112481272A CN112481272A CN202011535839.7A CN202011535839A CN112481272A CN 112481272 A CN112481272 A CN 112481272A CN 202011535839 A CN202011535839 A CN 202011535839A CN 112481272 A CN112481272 A CN 112481272A
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Abstract
本发明提供一种NOVA1促SMN2外显子7列入的验证方法及其应用,验证方法包括如下步骤:(1)RT‑PCR及酶切电泳分析SMN2全长基因在不同组织中的表达;(2)寻找SMN2全长基因在中枢系统中高表达的机制;(3)验证NOVA1是促进SMN2全长基因表达重要的剪接因子;(4)通过体外细胞实验证明敲降和过表达NOVA1显著抑制和促进SMN2外显子7列入;(5)证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入;(6)构建小鼠模型,证实NOVA1治疗脊髓、脑、肌肉SMN2列入比例均明显上升,其中大脑中SMN2外显子7列入上调具有显著差异。本发明证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入,并显著提升SMN蛋白的表达,而且该重组质粒可以在细胞内持续性表达,不用持续性给药。
Description
技术领域
本发明属于医学生物化学领域,具体涉及一种NOVA1促SMN2外显子7列入的验证方法及其应用。
背景技术
研究表明SMA是由于第五号染色体上运动神经元生存1(survival of motorneuron 1, SMN1)基因发生点突变或缺失导致该基因不能表达有功能的全长SMN蛋白。和动物不同,人类因为染色体5q13区的倒转复制(inverted duplication)产生了一个SMN1的平行同源基因称作SMN2;而两个基因包含9个外显子(1、2a、2b、3、4、5、6、7、8),编码完全相同294个氨基酸的SMN蛋白。两者的关键不同之处在于外显子7第6位核苷酸由SMN1中的C转变为SMN2中的T(C6T),虽然没有造成翻译中氨基酸的改变,却严重影响了该外显子列入(exon inclusion)。SMN2的成熟转录产物中约有90%不包含外显子7,而没有外显子7的蛋白(称作SMN∆7)基本没有功能且极不稳定。SMN2表达的少量全长SMN蛋白虽然不足以补偿SMN1基因的缺陷,却对病人的生存至关重要。
随着生物技术的飞速发展,CRISPR/Cas9基因编辑技术及基因治疗已成为研究热点。近年来国际权威期刊《科学》杂志(Science),频繁报道CRISPR/Cas9基因编辑技术应用于型肌营养不良(Duchenne muscular dystrophy, DMD)基因治疗的论文,以DMD动物模型-mdx小鼠为研究对象,进行动物体内试验。借助AAV载体运载基因编辑的CRISPR/Cas9进入体内细胞,做删除式基因编辑。删除了含有无义突变的23号外显子,形成永久性不含外显子23的DMD基因。治疗后肌肉病理得到改善,肌肉细胞膜上重新出现Dystrophin蛋白,小鼠肌肉力量得到增加。但是该项技术在SMA小鼠的治疗中尚没有相关研究报道,急需要开展新方法的探索研究。
基因表达RNA的异常剪接常常导致人类疾病,研究表明,超过60%的人类致病突变影响剪接,与基因突变造成的RNA剪接位点的错误选择有关,而不是直接影响编码序列。所有遗传性疾病中有三分之一可能具有剪接成分。在人类体内表达SMN蛋白有两个基因:SMN1和SMN2,但是起主要作用的SMN1基因突变失去功能后,由于SMN2基因外显子7大部分被剪切而仅有少量SMN全长基因,少量SMN有功能蛋白,目前最有效的方法是ASO反义寡核苷酸,靶向互补内含子7第10-27序列,比如商业化的Spinraza,靶向封闭内含子7剪接沉默子ISS序列,促进外显子7列入比例,但是ASO半衰期较短,必须持续性给药。
发明内容
本发明要解决的技术问题是提供一种NOVA1促SMN2外显子7列入的验证方法及其应用,研究证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入,并显著提升SMN蛋白的表达,而且该重组质粒可以在细胞内持续性表达,不用持续性给药。
为解决上述技术问题,本发明的实施例提供一种NOVA1促SMN2外显子7列入的验证方法,包括如下步骤:
(1)通过RT-PCR及酶切电泳分析SMN2全长基因在不同组织中的表达;
(2)寻找SMN2全长基因在中枢系统中高表达的机制;
(3)验证NOVA1是促进SMN2全长基因表达重要的剪接因子;
(4)通过体外细胞实验证明敲降和过表达NOVA1显著抑制和促进SMN2外显子7列入;
(5)构建SMN2外显子7中NOVA1靶向结合位点突变以及RNA pull down实验,证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入,并显著提升SMN蛋白的表达;
(6)构建小鼠模型:构建lenti-virus NOVA1过表达病毒,皮下注射SMA刚出生小鼠,与Fast Green组进行比较,结果显示:NOVA1治疗脊髓、脑、肌肉SMN2列入比例均明显上升,其中大脑中SMN2外显子7列入上调具有显著差异。
其中,步骤(1)的具体步骤为:
SMA I型对照和I型小鼠冰上麻醉后,取出相应组织迅速入液氮,组织匀浆后Trizol 法提RNA。RNA逆转录,5×RT Buffer 4μL;dNTP Mix(10nM each) 1μL;Oligo(dT)18(50μM) 1μL;RNase inhibitor (40 U/µl) 1μL;Reverse Transcriptase (200 U/μl) 1μL;RNA 1μg;RNase-free ddH2O to 20 µl;
PCR反应体系,2×Taq master mix 12.5μL;引物E6-F Cy5-ATAAT TCCCC CACCACCTCC 1μL;引物E8-467R TTGCC ACATA CGCCT CACAT AC 1μL;cDNA 1μL;ddH2O 9.5μL to25µl;
半定量扩增了28个循环(94℃ 30s,55℃ 30s和72℃ 25s);
PCR产物用DdeI酶进行酶切,并用2%琼脂糖凝胶进行电泳,Image J图像软件进行定量分析,外显子7的列入表示为FL与剪接转录本总量的百分比。
其中,步骤(2)的具体步骤为:
SMA I型小鼠中SMN2 外显子7列入的组织间差异,推测存在某些剪接因子,其在不同组织中表达具有差异,从而引起SMN2外显子 7列入差异。三类经典的剪接因子,即HNNRP、SR 及NOVA家族是神经疾病研究密切相关。因此,筛选了 HNNRP、 SR 及NOVA(引物如表1)家族部分成员共21个基因,检测其在SMA Ⅰ型小鼠中的表达差异,反应体系为2× ChamQUniversal SYBR qPCR Master Mix 5μL,F 0.5μL,R 0.5μL,cDNA 1μL,ddH2O 3μL;反应条件为:95℃ 5min;95℃ 10s,60℃ 20s,72℃ 20s,45个循环;60℃ 60s,95℃ 15s,统计剪接因子在中枢神经和周围非神经组织中的表达差异。
其中,步骤(3)的具体步骤为:
在SMA I型小鼠P1、P4 及 P7 各时间点,提取 RNA 及蛋白后,采用 QPCR 及western blot 方法分别检测 NOVA1和SMN全长基因及蛋白水平表达变化。结果显示在P1、P4 及 P7 阶段,SMN全长基因和蛋白表达随NOVA1呈递减趋势。
其中,步骤(4)的具体步骤为:
在细胞培养6 孔板中,种适量密度的U87MG细胞,并添加 2mL完全培养基,在细胞培养箱中培养过夜;次日,待细胞汇合达到 50%时,分别将 0.5μg NOVA1 过表达质粒或5μL20μM NOVA1 siRNA与1μg SMN2 minigene加入100μL opti-MEM 中混匀,室温放置 5min。同时,将3μLPEI加入100μLopti-MEM 中吹打混匀,室温放置5min;
将上述两种混合液加入同一离心管中,轻轻吹打混匀,室温静置20min。弃去6孔板中培养基,加800μL无血清培养基,再均匀加入配置好的转染混合物,十字摇晃混匀后培养;6h 后,用2mL新鲜预热的完全培养基换液。36~48h后检测SMN2外显子7列入。
其中,步骤(2)中,QPCR检测了21个剪接调控基因,发现NOVA1在中枢即大脑脊髓中高表达。
其中,步骤(4)的体外细胞实验中通过靶向沉默NOVA1和过表达NOVA1,SMN2全长基因和蛋白表达相应下调和上调,差异具有显著性。
其中,步骤(5)的具体步骤为:
根据NOVA1能够通过其 KH结构域(KH domain)与靶基因mRNA前体中的 YCAY基序(YACY motif;Y为嘧啶:Y=U 或C)结合的特点,预测SMN2外显子7第34-37位UCAC序列是NOVA1结合位点,通过定点删除和突变,把UCAC删除或突变为UAAC后,SMN2全长基因显著下调,RNA pull down实验表明该位点UCAC为NOVA1结合基序;进一步分二类突变该YCAY基序,其一,改变YCAY中Y的组合,发现SMN2全长基因有所下降,其二,改变YCAY中核心结合序列CA,发现SMN2全长基因极显著下降,有两个例外推测可能引入新的剪接因子;综上证明:NOVA1通过结合SMN2外显子7第34-37位UCAC序列促进外SMN2全长基因的表达,其中UCAC序列中CA最为重要。
本发明还提供一种NOVA1促SMN2外显子7列入的应用,用于制备延长脊髓型肌肉萎缩症小鼠存活时间的药物。
本发明的上述技术方案的有益效果如下:本发明首次发现NOVA1过表达质粒,可以靶向结合SMN2外显子7第34-37位TCAC序列,显著上调SMN2促进外显子7列入,并促进SMN蛋白的表达上升,包装的过表达NOVA1病毒在SMA小鼠体内显著延长了小鼠的生存时间,并促进体内SMN2外显子7列入比例,而且该重组质粒可以整合入宿主细胞基因组内,在细胞内持续性表达,一次性转染即可,并且过表达病毒可以整合到基因组中持续表达。
附图说明
图1为本发明中SMN2外显子7在type 1 cnotrol和type 1 出生4天体内组织中的列入比例;
图2为本发明中不同剪接因子在type 1 cnotrol和type 1 出生4天体内不同组织中的表达热图;
图3为本发明中NOVA1和SMN蛋白表达相关与运动神经元共定位图;
图4为本发明中NOVA1与SMN2外显子7列入的表达关系图;
图5为本发明中NOVA1在SMN2外显子7剪接结合靶点验证结果图;
图6为本发明中lenti-virus NOVA1过表达病毒在type I小鼠体内实验结果图。
具体实施方式
为使本发明要解决的技术问题、技术方案和优点更加清楚,下面将结合附图及具体实施例进行详细描述。
本发明提供一种NOVA1促SMN2外显子7列入的验证方法,包括如下步骤:
(1)通过RT-PCR及酶切电泳分析SMN2全长基因在不同组织中的表达;具体步骤为:
SMA I型对照和I型小鼠冰上麻醉后,取出相应组织迅速入液氮,组织匀浆后Trizol 法提RNA。RNA逆转录,5×RT Buffer 4μL;dNTP Mix(10nM each) 1μL;Oligo(dT)18(50μM) 1μL;RNase inhibitor (40 U/µl) 1μL;Reverse Transcriptase (200 U/μl) 1μL;RNA 1μg;RNase-free ddH2O to 20 µl;
PCR反应体系,2×Taq master mix 12.5μL;引物E6-F Cy5-ATAAT TCCCC CACCACCTCC 1μL;引物E8-467R TTGCC ACATA CGCCT CACAT AC 1μL;cDNA 1μL;ddH2O 9.5μL to25µl;
半定量扩增了28个循环(94℃ 30s,55℃ 30s和72℃ 25s);
PCR产物用DdeI酶进行酶切,并用2%琼脂糖凝胶进行电泳,Image J图像软件进行定量分析,外显子7的列入表示为FL与剪接转录本总量的百分比。
(2)寻找SMN2全长基因在中枢系统中高表达的机制,QPCR检测了21个剪接调控基因,发现NOVA1在中枢即大脑脊髓中高表达;具体步骤为:
SMA I型小鼠中SMN2 外显子7列入的组织间差异,推测存在某些剪接因子,其在不同组织中表达具有差异,从而引起SMN2外显子 7列入差异。三类经典的剪接因子,即HNNRP、SR 及NOVA家族是神经疾病研究密切相关。因此,筛选了 HNNRP、 SR 及NOVA(引物如表1)家族部分成员共21个基因,检测其在SMA Ⅰ型小鼠中的表达差异,反应体系为2× ChamQUniversal SYBR qPCR Master Mix 5μL,F 0.5μL,R 0.5μL,cDNA 1μL,ddH2O 3μL;反应条件为:95℃ 5min;95℃ 10s,60℃ 20s,72℃ 20s,45个循环;60℃ 60s,95℃ 15s,统计剪接因子在中枢神经和周围非神经组织中的表达差异。
表 1
Name | F (5’-3’) | R(5’-3’) |
mGapdh | CCGTAGACAAAATGGTGAAGGT | CGTGAGTGGAGTCATACTGGAA |
mHNRNPK | AGAAGAAACCTTCCCCAACACC | TGCGCAATTCAACCATCTCATC |
mHNRNPL | AGTGGAAGCTGACCTTGTGGAAG | AGCACGTCTTCAAACTCTACCAG |
mHNRNPLL | AGCTGACCTTGTGGAGGCAC | AGGCACATCTGCAGCAAATG |
mHNRNPU | AGTCTCCTCAGCCACCTGTTG | AGCACTCAGACGGTCTCTCG |
mHNRNPD | ATCGACGCCAGTAAGAACGAG | TGTGGTGTCCCAGCTAAGG |
mHNRNPH3 | TGCCATTTGGTTGCAGCAAAG | AGGCCTCCCCTGTGCTTC |
mHNRNPM | ACCTTTTGATGTGAAATGGCAGTC | AGAGCTCCACGTATGTTACCTC |
mHNRNPH2 | AGCCGTTTGAGGGAAGAAGAAG | ACCCTGTTAGAGTTTCTTCCAGG |
mHNRNPF | TCGGGTGGAGTTTGAGTTCGTAAG | ACCACCACAGATGCCTTCTG |
mSRSF10 | ACGTCTCTGTTCGTCAGGAACG | ACCATAACGACCAAATTCCCG |
mSRSF1 | TTCGCCTTCGTTGAGTTCGAG | CGGTAGCCGTCGTAGTCGTAG |
mSRPK1 | TCTAGGGTCTGACGATGACGAG | AGTGTCCCCAGCCCAATTTTC |
mSRSF3 | ATTTGAGGATCCCCGAGATGC | TCTTTTCACCATTCGACAGTTCC |
mSRSF6 | TGCCGTGTACGAGCTCAACAG | AGTTCTCCGACTGCTGTATCC |
mSRSF2 | AGCCCACCCAAGTCTCCAGAAG | ATGGACCGATGGACTGAGTTTG |
mSRSF4 | ATCCTGGAGGTGGATCTGAAG | ACACAGGTCTTTGCCGTTCAG |
mSRSF5 | ACTCAGAGAGCGCAGTTGATTTG | TCTCCCTCGCTGCTGGATTTAG |
mSRSF7 | ATTCCAAGCTAGAGCCGAGTAC | ACTCTCCTTTACCAGCACCAG |
mSRSF9 | AGATCGAGCTCAAGAACCGG | ACACTGGCCATAATCGTAACCG |
mNOVA1 | ACTGGAGCCACTATCAAGCTG | ATCCATGAACTGCGTTCAGCG |
mNOVA2 | AGACAGGAGCCACCATCAAG | AGACAGGAGCCACCATCAAG |
hGAPDH | GAAGGTCGGAGTCAACGGAT | TGGAAGATGGTGATGGGATT |
hSMN1/2 | ACCACCCCACTTACTATCATGC | GAATGTGAGCACCTTCCTTCTT |
hNOVA1 | GCCATCTTCCCCAACTACCA | TGCTCCATTACAGCCTTCACA |
(3)验证NOVA1是促进SMN2全长基因表达重要的剪接因子;具体步骤为:
在SMA I型小鼠P1、P4 及 P7 各时间点,提取 RNA 及蛋白后,采用 QPCR 及western blot 方法分别检测 NOVA1和SMN全长基因及蛋白水平表达变化。结果显示在P1、P4 及 P7 阶段,SMN全长基因和蛋白表达随NOVA1呈递减趋势。
(4)在体外细胞实验中,通过靶向沉默NOVA1和过表达NOVA1,SMN2全长基因和蛋白表达相应下调和上调,差异具有显著性,进一步表明NOVA1促进SMN2全长基因和蛋白表达表达,敲降和过表达NOVA1显著抑制和促进SMN2外显子7列入;具体步骤为:
在细胞培养6 孔板中,种适量密度的U87MG细胞,并添加 2mL完全培养基,在细胞培养箱中培养过夜;次日,待细胞汇合达到 50%时,分别将 0.5μg NOVA1 过表达质粒或5μL20μM NOVA1 siRNA与1μg SMN2 minigene加入100μL opti-MEM 中混匀,室温放置 5min。同时,将3μLPEI加入100μLopti-MEM 中吹打混匀,室温放置5min;
将上述两种混合液加入同一离心管中,轻轻吹打混匀,室温静置20min。弃去6孔板中培养基,加800μL无血清培养基,再均匀加入配置好的转染混合物,十字摇晃混匀后培养;6h 后,用2mL新鲜预热的完全培养基换液。36~48h后检测SMN2外显子7列入。
(5)构建SMN2外显子7中NOVA1靶向结合位点突变以及RNA pull down实验,证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入,并显著提升SMN蛋白的表达;具体步骤为:
根据NOVA1靶向结合YCAY基序(Y代表嘧啶)特点,预测SMN2外显子7第34-37位UCAC序列是NOVA1结合位点,通过定点删除和突变,把UCAC删除或突变为UAAC后,SMN2全长基因显著下调,RNA pull down实验表明该位点UCAC为NOVA1结合基序;进一步分二类突变该YCAY基序,其一,改变YCAY中Y的组合,发现SMN2全长基因有所下降,其二,改变YCAY中核心结合序列CA,发现SMN2全长基因极显著下降,有两个例外推测可能引入新的剪接因子;综上证明:NOVA1通过结合SMN2外显子7第34-37位UCAC序列促进外SMN2全长基因的表达,其中UCAC序列中CA最为重要。
(6)构建小鼠模型:构建lenti-virus NOVA1过表达病毒,皮下注射SMA刚出生小鼠,与Fast Green组进行比较,结果显示:NOVA1治疗脊髓、脑、肌肉SMN2列入比例均明显上升,其中大脑中SMN2外显子7列入上调具有显著差异。
本发明还提供一种NOVA1促SMN2外显子7列入的应用,用于制备延长脊髓型肌肉萎缩症小鼠存活时间的药物。
下面结合具体实施例进一步阐述本发明的技术方案。
脊髓型肌肉萎缩症SMN1基因突变或缺失失去功能,仅有的同源基因SMN2是治疗的靶点,通过RT-PCR及酶切电泳分析,SMN2全长基因在type I control 和type I 小鼠在不同组织中的表达,发现在中枢即大脑和脊髓高表达,差异有统计学意义如图1所示,其中,图1A为在type 1 cnotrol和type 1小鼠不同组织中SMN2外显子7 列入电泳图,图1B为图1A的电泳图列入比例统计,“*”表示与liver组相比P<0.05。
因此,SMN2全长基因表达差异具有组织特异性,为此,寻找SMN2全长基因在中枢系统中高表达的机制,QPCR(实时荧光定量核酸扩增检测系统)检测了21个剪接调控基因,发现NOVA1在中枢即大脑脊髓中高表达,如图2所示,其中,图2A和图2B分别为type 1 cnotrol和type 1小鼠不同组织中剪接因子的QPCR表达热图,均以liver组为对照,计算2-ΔΔ值,其中NOVA1在中枢中表达最高。
随着疾病发展进程P1、p4、p7 NOVA1和SMN蛋白表达具有协同性(图3A-F),NOVA1在脊髓前角运动神经元中NOVA1表达(图3G),推测NOVA1与脊髓性肌肉萎缩小鼠脊髓前角运动神经元退行性病变密切相关。其中,图3A表示NOVA1基因表达在SMA小鼠疾病发生过程表达逐渐下调;图3B和图3C表示NOVA1蛋白也逐渐下调;图3D和图3E表示SMN蛋白也逐渐下调;图3F表示SMN2表达全长基因也下调;图3G表示NOVA1和运动神经元ChAT表达共定位;图3H表示尼氏染色显示SMA小鼠疾病发展过程中运动神经元逐渐空泡化、数量减少、凋亡。
在体外细胞实验中,通过靶向沉默NOVA1和过表达NOVA1,SMN2全长基因和蛋白表达相应下调和上调,差异具有显著性(图4A-J)。进一步表明NOVA1促进SMN2全长基因和蛋白表达表达。其中,图4A为NOVA1敲降效率图;图4B为U87细胞中敲降NOVA1后SMN2剪接琼脂糖凝胶电泳图; 图4C为U87细胞中敲降NOVA1后SMN2剪接水平变化统计图;图4D为U87细胞中敲降NOVA1后SMN蛋白水平变化电泳图;图4E为U87细胞中敲降NOVA1后SMN蛋白水平变化统计图;图4F为U87细胞中过表达NOVA1后NOVA1 mRNA水平变化统计图;图4G为U87细胞中过表达NOVA1后SMN2剪接琼脂糖凝胶电泳图;图4H为U87细胞中过表达NOVA1后SMN2剪接水平变化统计图;图4I为U87细胞中过表达NOVA1后SMN蛋白水平变化电泳图;图4J为U87细胞中过表达NOVA1后SMN蛋白水平变化统计图。
根据NOVA1能够通过其 KH结构域(KH domain)与靶基因mRNA前体中的 YCAY基序(YACY motif;Y为嘧啶:Y=U 或C)结合的特点,预测SMN2外显子7第34-37位UCAC序列是NOVA1结合位点(图5 A),通过定点删除和突变,把UCAC删除或突变为UAAC后,SMN2全长基因显著下调(图5 B、C),RNA pull down实验表明该位点UCAC为NOVA1结合基序(图5 D)。进一步分二类突变该YCAY基序,其一,改变YCAY中Y的组合,发现SMN2全长基因有所下降,其二,改变YCAY中核心结合序列CA(图5 E),发现SMN2全长基因极显著下降,有两个例外推测可能引入新的剪接因子(图5 F、G、H)。综上,证明,NOVA1通过结合SMN2外显子7第34-37位UCAC序列促进外SMN2全长基因的表达,其中UCAC序列中CA最为重要。其中,图5A为预测SMN2外显子7第34-37位UCAC基序示意图;图5B为HEK293T细胞中突变UCAC序列后SMN2剪接琼脂糖凝胶电泳图;图5C为HEK293T细胞中突变UCAC序列后SMN2剪接水平变化统计图;图5D为SMN2外显子7 NOVA1结合序列UCAC pull down实验结果图;图5E为分二类突变该YCAY基序示意图;图5F、G为NOVA1结合序列分类突变对SMN2外显子7列入的影响图;图5H为对F和G图电泳的定量分析图。
构建lenti-virus NOVA1过表达病毒(图6 A、B),皮下注射SMA刚出生小鼠(图6C),与Fast Green组相比NOVA1治疗脊髓、脑、肌肉SMN2列入比例均明显上升,其中大脑中SMN2外显子7列入上调具有显著差异(图6 D),与Fast Green组相比NOVA1治疗组明显延缓了type1小鼠存活最长至15天(图6 E)。其中,图6A中,A1为lenti-virus GFP对照,A2-4分别为滴度1×109的lenti-virus NOVA1体积为5ul、10ul、20ul;图6B为A图QPCR检测统计图,“***”表示与对照组相比,P<0.0001;图6C为小动物活体成像拍摄小鼠皮下注射荧光图;图6C中,C1为Fast Green注射对照组,C2-4为颈背部皮下注射lenti-virus NOVA1 2ul、4ul、8ul;图6D为与Fast Green组相比NOVA1治疗脊髓、脑、肌肉SMN2列入比例上调统计图;图6E为与Fast Green组相比NOVA1治疗组明显延缓了type1小鼠存活最长至15天,(n=5,n=7,n=8)。
本发明的NOVA1过表达质粒,可以靶向结合SMN2外显子7第34-37位TCAC序列,显著上调SMN2促进外显子7列入,并促进SMN蛋白的表达上升,包装的过表达NOVA1病毒在SMA小鼠体内显著延长了小鼠的生存时间,并促进体内SMN2外显子7列入比例,而且该重组质粒可以整合入宿主细胞基因组内,在细胞内持续性表达,一次性转染即可,并且过表达病毒可以整合到基因组中持续表达。
以上所述是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明所述原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
序列表
<110> 南通大学
<120> NOVA1促SMN2外显子7列入的验证方法及其应用
<141> 2020-12-23
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Ala Thr Thr Thr Ala Gly
20
<210> 39
<211> 22
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 39
Ala Thr Thr Cys Cys Ala Ala Gly Cys Thr Ala Gly Ala Gly Cys Cys
1 5 10 15
Gly Ala Gly Thr Ala Cys
20
<210> 40
<211> 21
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 40
Ala Cys Thr Cys Thr Cys Cys Thr Thr Thr Ala Cys Cys Ala Gly Cys
1 5 10 15
Ala Cys Cys Ala Gly
20
<210> 41
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 41
Ala Gly Ala Thr Cys Gly Ala Gly Cys Thr Cys Ala Ala Gly Ala Ala
1 5 10 15
Cys Cys Gly Gly
20
<210> 42
<211> 22
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 42
Ala Cys Ala Cys Thr Gly Gly Cys Cys Ala Thr Ala Ala Thr Cys Gly
1 5 10 15
Thr Ala Ala Cys Cys Gly
20
<210> 43
<211> 21
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 43
Ala Cys Thr Gly Gly Ala Gly Cys Cys Ala Cys Thr Ala Thr Cys Ala
1 5 10 15
Ala Gly Cys Thr Gly
20
<210> 44
<211> 21
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 44
Ala Thr Cys Cys Ala Thr Gly Ala Ala Cys Thr Gly Cys Gly Thr Thr
1 5 10 15
Cys Ala Gly Cys Gly
20
<210> 45
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 45
Ala Gly Ala Cys Ala Gly Gly Ala Gly Cys Cys Ala Cys Cys Ala Thr
1 5 10 15
Cys Ala Ala Gly
20
<210> 46
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 46
Ala Gly Ala Cys Ala Gly Gly Ala Gly Cys Cys Ala Cys Cys Ala Thr
1 5 10 15
Cys Ala Ala Gly
20
<210> 47
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 47
Gly Ala Ala Gly Gly Thr Cys Gly Gly Ala Gly Thr Cys Ala Ala Cys
1 5 10 15
Gly Gly Ala Thr
20
<210> 48
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 48
Thr Gly Gly Ala Ala Gly Ala Thr Gly Gly Thr Gly Ala Thr Gly Gly
1 5 10 15
Gly Ala Thr Thr
20
<210> 49
<211> 22
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 49
Ala Cys Cys Ala Cys Cys Cys Cys Ala Cys Thr Thr Ala Cys Thr Ala
1 5 10 15
Thr Cys Ala Thr Gly Cys
20
<210> 50
<211> 22
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 50
Gly Ala Ala Thr Gly Thr Gly Ala Gly Cys Ala Cys Cys Thr Thr Cys
1 5 10 15
Cys Thr Thr Cys Thr Thr
20
<210> 51
<211> 20
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 51
Gly Cys Cys Ala Thr Cys Thr Thr Cys Cys Cys Cys Ala Ala Cys Thr
1 5 10 15
Ala Cys Cys Ala
20
<210> 52
<211> 21
<212> PRT
<213> 人工合成(Artificial synthesis)
<400> 52
Thr Gly Cys Thr Cys Cys Ala Thr Thr Ala Cys Ala Gly Cys Cys Thr
1 5 10 15
Thr Cys Ala Cys Ala
20
Claims (9)
1.一种NOVA1促SMN2外显子7列入的验证方法,其特征在于,包括如下步骤:
(1)通过RT-PCR及酶切电泳分析SMN2全长基因在不同组织中的表达;
(2)寻找SMN2全长基因在中枢系统中高表达的机制;
(3)验证NOVA1是促进SMN2全长基因表达重要的剪接因子;
(4)通过体外细胞实验证明敲降和过表达NOVA1显著抑制和促进SMN2外显子7列入;
(5)构建SMN2外显子7中NOVA1靶向结合位点突变以及RNA pull down实验,证实NOVA1是通过结合外显子7靶向序列促进SMN2外显子7列入,并显著提升SMN蛋白的表达;
(6)构建小鼠模型:构建lenti-virus NOVA1过表达病毒,皮下注射SMA刚出生小鼠,与Fast Green组进行比较,结果显示:NOVA1治疗脊髓、脑、肌肉SMN2列入比例均明显上升,其中大脑中SMN2外显子7列入上调具有显著差异。
2.根据权利要求1所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(1)的具体步骤为:
SMA I型对照和I型小鼠冰上麻醉后,取出相应组织迅速入液氮,组织匀浆后Trizol 法提RNA;RNA逆转录,5×RT Buffer 4μL;dNTP Mix 1μL;Oligo 18 1μL;RNase inhibitor 1μL;Reverse Transcriptase 1μL;RNA 1μg;RNase-free ddH2O to 20 µl;
PCR反应体系,2×Taq master mix 12.5μL;引物E6-F Cy5-ATAAT TCCCC CACCA CCTCC1μL;引物E8-467R TTGCC ACATA CGCCT CACAT AC 1μL;cDNA 1μL;ddH2O 9.5μL to 25µl;
半定量扩增了28个循环;
PCR产物用DdeI酶进行酶切,并用2%琼脂糖凝胶进行电泳,Image J图像软件进行定量分析,外显子7的列入表示为FL与剪接转录本总量的百分比。
3.根据权利要求1所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(2)的具体步骤为:
筛选了 HNNRP、 SR 及NOVA家族部分成员共21个基因,检测其在SMA Ⅰ型小鼠中的表达差异,反应体系为2× ChamQ Universal SYBR qPCR Master Mix 5μL,F 0.5μL,R 0.5μL,cDNA 1μL,ddH2O 3μL;反应条件为:95℃ 5min;95℃ 10s,60℃ 20s,72℃ 20s,45个循环;60℃ 60s,95℃ 15s,统计剪接因子在中枢神经和周围非神经组织中的表达差异。
4.根据权利要求1所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(3)的具体步骤为:
在SMA I型小鼠P1、P4 及 P7 各时间点,提取 RNA 及蛋白后,采用 QPCR 及westernblot 方法分别检测 NOVA1和SMN全长基因及蛋白水平表达变化。
5.根据权利要求1所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(4)的具体步骤为:
在细胞培养6 孔板中,种适量密度的U87MG细胞,并添加 2mL完全培养基,在细胞培养箱中培养过夜;次日,待细胞汇合达到 50%时,分别将 0.5μg NOVA1 过表达质粒或5μL 20μM NOVA1 siRNA与1μg SMN2 minigene加入100μL opti-MEM 中混匀,室温放置 5min;同时,将3μLPEI加入100μLopti-MEM 中吹打混匀,室温放置5min;
将上述两种混合液加入同一离心管中,轻轻吹打混匀,室温静置20min;
弃去6孔板中培养基,加800μL无血清培养基,再均匀加入配置好的转染混合物,十字摇晃混匀后培养;6h 后,用2mL新鲜预热的完全培养基换液;
36~48h后检测SMN2外显子7列入。
6.根据权利要求1或3所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(2)中,QPCR检测了21个剪接调控基因,发现NOVA1在中枢即大脑脊髓中高表达。
7.根据权利要求1或5所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(4)的体外细胞实验中通过靶向沉默NOVA1和过表达NOVA1,SMN2全长基因和蛋白表达相应下调和上调,差异具有显著性。
8.根据权利要求1所述的NOVA1促SMN2外显子7列入的验证方法,其特征在于,步骤(5)的具体步骤为:
根据NOVA1靶向结合YCAY基序特点,预测SMN2外显子7第34-37位UCAC序列是NOVA1结合位点,通过定点删除和突变,把UCAC删除或突变为UAAC后,SMN2全长基因显著下调,RNApull down实验表明该位点UCAC为NOVA1结合基序;进一步分二类突变该YCAY基序,其一,改变YCAY中Y的组合,发现SMN2全长基因有所下降,其二,改变YCAY中核心结合序列CA,发现SMN2全长基因极显著下降,有两个例外推测可能引入新的剪接因子;综上证明:NOVA1通过结合SMN2外显子7第34-37位UCAC序列促进外SMN2全长基因的表达,其中UCAC序列中CA最为重要。
9.一种NOVA1促SMN2外显子7列入的应用,其特征在于,用于制备延长脊髓型肌肉萎缩症小鼠存活时间的药物。
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