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请教qPCR时候primer efficiency的问题
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请教qPCR时候primer efficiency的问题# Biology - 生物学
g*a
1
今天买了一块希捷1T sshd,塞到一个外置硬盘盒里,连到一台dell e6530上,指示灯亮
了,说明连接没有问题,在computer management->device manager->usb controllers
里面也发现了usb mass storage device,可是在资源管理器里该硬盘的盘符就是不显示。
过路大神帮帮忙!
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V*t
2
是每个实验都要把efficiency算进去吗?
可是我看到,大部分人做qPCR检测mRNA变化的时候,是根本不做梯度稀释,计算
efficiency的。
哪种好啊?每次都算efficiency,工作量变大了。。。
avatar
g*t
3
在disk management再assign一个盘符
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Z*5
4
基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
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V*t
5
这能准确吗
我用了文献的引物 和 primer bank的引物,测试都是1.6-1.8。
看表达变化,加上efficiency,跟不加,计算出来的是有些差别的呐。

【在 Z******5 的大作中提到】
: 基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
A*y
6
No, you have to do it at least when you get the primers in to make sure they
are good, linear, and have a good range. If you do delta delta C(t) method
, you don't have to do it every run but checking is definitely necessary.
I know a lot of people don't do it, that's why you see NCS paper with mouse
primers using in human samples or primers flat out don't work. I know a big
lab in Harvard don't check their primers because half of their primers are
not efficient nor linear in their NCS papers. Karma and pubpeer will get
them soon.

【在 Z******5 的大作中提到】
: 基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
V*t
7
如果你检测,某target引物的efficiency是1.6,内参是1.9,那只用检测一次吧,以后
只要同时用内参和这个target都按1.9,1.6计算?
但是实际上每次不同的pcr,efficiency也会有变化的啊。难道每次都做个梯度稀释才
是最准确的?

they
method
mouse
big
are

【在 A******y 的大作中提到】
: No, you have to do it at least when you get the primers in to make sure they
: are good, linear, and have a good range. If you do delta delta C(t) method
: , you don't have to do it every run but checking is definitely necessary.
: I know a lot of people don't do it, that's why you see NCS paper with mouse
: primers using in human samples or primers flat out don't work. I know a big
: lab in Harvard don't check their primers because half of their primers are
: not efficient nor linear in their NCS papers. Karma and pubpeer will get
: them soon.

avatar
A*y
8
The variability shouldn't be that great (less than 5%) or there is something
wrong with your procedure. To do absolute, I will recommend doing the
titration on the side every time.

【在 V******t 的大作中提到】
: 如果你检测,某target引物的efficiency是1.6,内参是1.9,那只用检测一次吧,以后
: 只要同时用内参和这个target都按1.9,1.6计算?
: 但是实际上每次不同的pcr,efficiency也会有变化的啊。难道每次都做个梯度稀释才
: 是最准确的?
:
: they
: method
: mouse
: big
: are

avatar
t*k
9
原来大家做实验都这么粗放的呀。。。。
[在 Zifeng85 (Zifeng9527) 的大作中提到:]
:基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
V*t
10
是每个实验都要把efficiency算进去吗?
可是我看到,大部分人做qPCR检测mRNA变化的时候,是根本不做梯度稀释,计算
efficiency的。
哪种好啊?每次都算efficiency,工作量变大了。。。
avatar
Z*5
11
基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
V*t
12
这能准确吗
我用了文献的引物 和 primer bank的引物,测试都是1.6-1.8。
看表达变化,加上efficiency,跟不加,计算出来的是有些差别的呐。

【在 Z******5 的大作中提到】
: 基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
A*y
13
No, you have to do it at least when you get the primers in to make sure they
are good, linear, and have a good range. If you do delta delta C(t) method
, you don't have to do it every run but checking is definitely necessary.
I know a lot of people don't do it, that's why you see NCS paper with mouse
primers using in human samples or primers flat out don't work. I know a big
lab in Harvard don't check their primers because half of their primers are
not efficient nor linear in their NCS papers. Karma and pubpeer will get
them soon.

【在 Z******5 的大作中提到】
: 基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
V*t
14
如果你检测,某target引物的efficiency是1.6,内参是1.9,那只用检测一次吧,以后
只要同时用内参和这个target都按1.9,1.6计算?
但是实际上每次不同的pcr,efficiency也会有变化的啊。难道每次都做个梯度稀释才
是最准确的?

they
method
mouse
big
are

【在 A******y 的大作中提到】
: No, you have to do it at least when you get the primers in to make sure they
: are good, linear, and have a good range. If you do delta delta C(t) method
: , you don't have to do it every run but checking is definitely necessary.
: I know a lot of people don't do it, that's why you see NCS paper with mouse
: primers using in human samples or primers flat out don't work. I know a big
: lab in Harvard don't check their primers because half of their primers are
: not efficient nor linear in their NCS papers. Karma and pubpeer will get
: them soon.

avatar
A*y
15
The variability shouldn't be that great (less than 5%) or there is something
wrong with your procedure. To do absolute, I will recommend doing the
titration on the side every time.

【在 V******t 的大作中提到】
: 如果你检测,某target引物的efficiency是1.6,内参是1.9,那只用检测一次吧,以后
: 只要同时用内参和这个target都按1.9,1.6计算?
: 但是实际上每次不同的pcr,efficiency也会有变化的啊。难道每次都做个梯度稀释才
: 是最准确的?
:
: they
: method
: mouse
: big
: are

avatar
t*k
16
原来大家做实验都这么粗放的呀。。。。
[在 Zifeng85 (Zifeng9527) 的大作中提到:]
:基本都不做的吧。一般就是设计至少两对引物就OK了。efficiency默认是2.
avatar
t*n
17
一家之言:
我原来做过一批引物的效率,有variation, 比如你把cDNA反复冻融,或在4度放很长时
间。
大多数情况下,我们是用来测mRNA上调下调的,从2到1.8或1.6会影响比值,比如从10
倍,变成8或6倍,但上调或下调不会变。所以如果你比值是2或3的话,要特别小心。通
常,这个qPCR也并不是单一的证据。
所以,我们极少做每对引物的效率,太多了。很少数常用的引物,到可以验证。

【在 V******t 的大作中提到】
: 是每个实验都要把efficiency算进去吗?
: 可是我看到,大部分人做qPCR检测mRNA变化的时候,是根本不做梯度稀释,计算
: efficiency的。
: 哪种好啊?每次都算efficiency,工作量变大了。。。

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