主要优点:
1.比加A尾法更高的反转录效率:
"The advantage of adding the 3' adapter sequence using RNA ligase as used in MiraMas kit, provides higher specificity for priming the reverse transcription step and also the binding site for the Reverse PCR primer only at the 3' ends of the RNAs, compared to using polyA polymerase to add homopolymeric A's followed by hybridization of the oligo dT/adapter to provide the binding sites for RT and Rev PCR primer. The problem with the polyA approach is that the oligo dT can hybridize to internal homopolymeric A regions in mRNAs, instead of only to 3' end."
2.更多的单样品miRNA检测数量:
"Each MiraMas reaction can be used to make cDNA library to allow for analysis of 10's - 100's of microRNA targets (depending on mass amount of input RNA), compared to Qiagen kit each reaction only makes enough cDNA for around 5 target microRNAs. And Qiagen kit does not allow flexibility to use high or low input amounts of RNA. Using the low input amounts, researcher can process lots of samples from one kit." 作者: 冰儿0109 时间: 2011-10-7 10:26
我也是用U6作为内参,是鸡上的U6,参考的是别人文章中报道的:
Chicken small nuclear RNA U6 (GCAGGGGCCAUGCUAAUCUUCUCUGUAUCG)
was used for normalization. The expression levels of novel miRNAs were measured in terms of threshold cycle value (CT) and normalized to U6 using 2-ΔΔCT [72].
我们根据这个序列设计引物,因为这个序列本身比较长,所以我们只取了一部分大概20nt左右,和其他miRNA一样也是进行Stem-loop RT引物设计,然后反转录,最后设计上下游引物进行定量。
但是定量后发现CT值上不去,都在24-28之间徘徊,有的达到了30,我们想了2个方案解决这个问题:
1. 买公司设计好的U6,但是U6多是人和小鼠上的,不知道拿到鸡上是否好用,而且ABI的U6是探针法设计的,我们用的是sybrgreen法定量。所以这个方法似乎不可行
我也是用U6作为内参,是鸡上的U6,参考的是别人文章中报道的:
Chicken small nuclear RNA U6 (GCAGGGGCCAUGCUAAUCUUCUCUGUAUCG)
was used for normalization. The expression levels of novel miRNAs were measured in terms of threshold cycle value (CT) and normalized to U6 using 2-ΔΔCT [72].
我们根据这个序列设计引物,因为这个序列本身比较长,所以我们只取了一部分大概20nt左右,和其他miRNA一样也是进行Stem-loop RT引物设计,然后反转录,最后设计上下游引物进行定量。
但是定量后发现CT值上不去,都在24-28之间徘徊,有的达到了30,我们想了2个方案解决这个问题:
1. 买公司设计好的U6,但是U6多是人和小鼠上的,不知道拿到鸡上是否好用,而且ABI的U6是探针法设计的,我们用的是sybrgreen法定量。所以这个方法似乎不可行