l***7 发帖数: 50 | 1 Hello, everyone, the gene I am working on has protein expression as detected
by western blot, but its mRNA in the same type of cells is undetectable by
real-time PCR. Do you know how to explain this? Thanks very much! |
s******s 发帖数: 13035 | 2 保证你实验设计操作都没问题的情况下,会不会
你的蛋白比较稳定
detected
by
【在 l***7 的大作中提到】 : Hello, everyone, the gene I am working on has protein expression as detected : by western blot, but its mRNA in the same type of cells is undetectable by : real-time PCR. Do you know how to explain this? Thanks very much!
|
o**i 发帖数: 1165 | 3 我觉得你的realtime或者western有问题
detected
by
【在 l***7 的大作中提到】 : Hello, everyone, the gene I am working on has protein expression as detected : by western blot, but its mRNA in the same type of cells is undetectable by : real-time PCR. Do you know how to explain this? Thanks very much!
|
f*********e 发帖数: 1144 | 4 反着有可能,但是你的顺序不可能阿。。。。蛋白都行,怎么可能gene不行啊
detected
by
【在 l***7 的大作中提到】 : Hello, everyone, the gene I am working on has protein expression as detected : by western blot, but its mRNA in the same type of cells is undetectable by : real-time PCR. Do you know how to explain this? Thanks very much!
|
w*e 发帖数: 740 | 5 你确定抗体特异性很好么?
detected
by
【在 l***7 的大作中提到】 : Hello, everyone, the gene I am working on has protein expression as detected : by western blot, but its mRNA in the same type of cells is undetectable by : real-time PCR. Do you know how to explain this? Thanks very much!
|
w******y 发帖数: 8040 | 6 估计蛋白不特异
【在 f*********e 的大作中提到】 : 反着有可能,但是你的顺序不可能阿。。。。蛋白都行,怎么可能gene不行啊 : : detected : by
|
f*********e 发帖数: 1144 | 7 什么意思?说抗体specificity差?
那打质普吧。。。。如果知道什么蛋白,一了白了
【在 w******y 的大作中提到】 : 估计蛋白不特异
|
Z**********g 发帖数: 222 | 8 搞一个表达该基因的阳性细胞和不表达该基因的阴性细胞作为对照,确定一下PCR或
western是否出问题.另外,你的样品是否经过处理(如药物),比方说,可能该处理抑制了
mRNA表达,但该蛋白比较稳定,半衰期长. |
l***7 发帖数: 50 | 9 谢谢大家的回复。
我想要把人的FOXD3基因克隆到一个病毒载体上。看到有的公司用HEPG2细胞来检测他
们的抗FOXD3的抗体 (http://www.scbt.com/datasheet-133588-foxd3-f-23-antibody.html),我就用HEPG2细胞的cDNA来PCR FOXD3,总得不到所要的片段 (得到一片段,但大了100多bp),即使是用real time pcr 的引物来检测cDNA,也没得到相应大小的片段。
有些细胞 (A-431, U-2 OS and U-251 MG) 检测不到FOXD3 RNA, 但能用FOXD3抗体
标记上,不知怎么解释。
RNA: http://www.proteinatlas.org/ENSG00000187140/rna
PROTEIN: http://www.proteinatlas.org/ENSG00000187140/cell
今天发现FOXD3只有一个外显子,没有内含子,所以我准备直接从基因组DNA里PCR试试。
谢谢。 |
l*****a 发帖数: 1431 | |
l***7 发帖数: 50 | 11 Yes, more than 70% GC. I have tried 10% DMSO or Enhancer Buffer from
Invitrogen for the PCR. |
l*****a 发帖数: 1431 | 12 10%DMSO 有点高了。你的PCR有positive control 或者说 在genomic DNA 上work吗? |
l***7 发帖数: 50 | 13 用10%的DMSO是网上看到的,也有人用3%-8%的DMSO。
没有positive control。这基因GC含量很高,ORF含有72%的GC。我重新设计了一对不带
酶切位点(接头)的引物,今天刚从genomic DNA里扩出了一条大小相符的带。明天重
复一下,就送去测序看看。
谢谢。 |