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夏菡小屋

金虫 (正式写手)

[求助] 姜的总RNA提取,电泳只有一条带已有5人参与

见图,这是我今天提取姜的总RNA结果图,旁边是TAKARA的DL5000 marker,用的是1.2%的普通琼脂糖凝胶电泳,总共提取了7管,用了三个不同的方法,其中一个方法(Lane 3)未见条带,其余均有明显条带,感觉有降解,但只有一个明显的条带,这是28s RNA吗?姜的28s 和18s,5s RNA到底是多大啊,求指导!!这种图显示,应该问题出在什么地方?

姜的总RNA提取,电泳只有一条带
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夏菡小屋

金虫 (正式写手)

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6楼: Originally posted by gyesang at 2014-04-19 19:44:50
这个protocol是典型的提取DNA的操作步骤

提RNA得用trizol试剂...

不对啊  我是根据文献的操作来的啊。参考文献是:A simple and rapid method for RNA isolation from plant tissues with high phenolic compounds and polysaccharides.
Extraction buffer: 0.25 M NaCl, 0.05 M Tris-HCl (pH 7.5), 20 mM EDTA, 1% (w/v) sodium dodecyl sulphate (SDS) and 4% (w/v) PVP (M.W. 360,000)

RNA extraction  
1 Add 7.5 ml of extraction buffer and 7.5 ml of CI to a 30 ml-round bottom Nalgene tube.  
2 Grind 1 g frozen mangosteen sample to fine powder with a mortar and pestle in liquid nitrogen.
3 Transfer 1 g of ground sample to a tube containing the extraction buffer and CI and vortex vigorously.  
4 Centrifuge at 12,857 g for 2 min at room temperature.
5 Transfer the supernatant to a new 30 ml-round bottom Nalgene tube and purify with an equal volume of PCI. Centrifuge at 12,857 g for 2 min at room temperature. Repeat this step until there
is a clean interface observed.
6 Transfer the supernatant to a new 30 ml-round bottom Nalgene tube and add one tenth volume of 3 M sodium acetate pH 5.2 and 2.5 volume of cold absolute ethanol, mix well, and incubate at 4 °C for 30 min.
7 Recover the nucleic acids by centrifugation at 12,857 g for 20 min at 4 °C.
8 Wash the pellet with 70% (v/v) ethanol, air-dry, and add 200 μl DEPC-treated water to dissolve the pellet.
9 Transfer the supernatant to a 1.5 ml tube and add 10 M LiCl to a final concentration of 2 M and keep on ice for 1 h. Centrifuge at 18,514 g for 20 min at 4 °C.
10 Wash the pellet with 70% (v/v) ethanol, air-dry, and add 20 μl DEPC-treated water to
dissolve the pellet. Centrifuge at 18,514 g for 10 min at 4 °C.
11 Add 0.1 volume of 3 M sodium acetate pH 5.2 and 2.5 volume of cold absolute ethanol, mix well, and store at -80 °C.
Analysis of RNA quality  
12. The total RNA was quantified with a spectrophotometer at 230, 260, 280 nm. The integrity of total RNA was verified by analyzing approximately 1 μg RNA sample on 1% (w/v) formaldehyde denaturing agarose gel
12楼2014-04-21 09:03:36
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iamcsy

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就图片来看,太难看了!28s和18s都烂成这样,还想看5s呢!还有,DNA都没除尽。

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2楼2014-04-19 15:55:56
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gyesang

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感谢参与,应助指数 +1
夏菡小屋(西门吹雪170代发): 金币+1, 鼓励回帖交流 2014-06-30 21:06:49
你提取的这是DNA,RNA你根本没有提取出来
学术问题讨论咨询发邮件gyesang@163.com
3楼2014-04-19 17:27:13
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夏菡小屋

金虫 (正式写手)

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3楼: Originally posted by gyesang at 2014-04-19 17:27:13
你提取的这是DNA,RNA你根本没有提取出来

抽提缓冲液:0.25M NaCl,0.05M Tris-HCl(pH7.5),20mM EDTA,1%(w/v)SDS,4%(w/v) PVP(M.W.360,000)
提取步骤:
1.1.5ml离心管中加入0.5ml抽提缓冲液和0.5ml 苯酚氯仿异戊醇(25:24:1);
2.0.5g冰冻样品至研钵中,在液氮存在下研磨成粉末;
3.转移1g样品至离心管中(步骤1),涡旋剧烈震荡混匀;
4.4℃离心12000rpm*10min;
5.转移上清至另一离心管中,加入等体积的 苯酚氯仿异戊醇(25:24:1),4℃离心12000rpm*3min,重复此步骤直到能看到一个清晰的界面;
6.转移上清至新的离心管中,加入十分之一体积3M醋酸钠(pH5.2)以及2.5倍体积冷无水乙醇,混匀后,4℃孵育30min;
7.再次4℃离心12000rpm*20min;
8.冷的70%乙醇洗涤后干燥,加入200μL DEPC处理水溶解沉淀;
9.转移上清至新的离心管中加入4M LiCl至终浓度为2M,冰上放置1h,4℃离心12000rpm*20min;
10. 冷的70%乙醇洗涤后干燥,加入50μL DEPC处理水溶解沉淀;

请问我的步骤有问题吗?
4楼2014-04-19 17:48:16
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