产品简介
Hieff® qPCR SYBR Green Master Mix(Low Rox Plus)是2×实时定量PCR扩增的预混合溶液。Mix中含有热启动Hieff® DNA Polymerase、SYBR Green I、dNTPs、Mg2+及Low Rox。使用时,仅需在扩增体系中加入模板和引物即可进行实时荧光定量PCR,大大简化操作过程,降低污染几率。
本品采用的DNA聚合酶配体可以随温度变化实时调节DNA聚合酶活性。配方添加了有效抑制非特异性PCR扩增的因子和提升PCR反应扩增效率的因子,使定量PCR可以在宽广的定量区域内获得良好的线性关系。
产品信息
货号 |
11202ES03 / 11202ES08 / 11202ES50/ 11202ES60 |
规格 |
1 mL / 5×1 mL / 50×1 mL / 100×1 mL |
储存条件
-25~-15℃避光保存,有效期18个月。本品避免反复冻融。产品中含有荧光染料SYBR Green I,保存或配制反应体系时需避免强光照射。
使用说明
组分 |
体积 (μL)**** |
体积 (μL) |
终浓度 |
Hieff® qPCR SYBR Green Master Mix (Low Rox Plus)* |
25 |
10 |
1× |
Forward Primer (10 μM)** |
1 |
0.4 |
0.2 μM |
Reverse Primer (10 μM)** |
1 |
0.4 |
0.2 μM |
模板DNA*** |
X |
X |
- |
RNase Free H2O |
to 50 |
to 20 |
- |
*使用前务必充分混匀,避免剧烈震荡产生过多气泡。
**通常引物终浓度为0.2 μM,也可以根据情况在0.1-1.0 μM之间进行调整。
***如模板类型为未稀释cDNA原液,使用体积不应超过qPCR反应总体积的1/10。cDNA原液建议5-10倍稀释,最佳模板加入量以扩增得到的CT值在20-30个循环为好。
****推荐使用20 μL或50 μL总体积,以保证目的基因扩增的有效性和重复性。
循环步骤 |
温度 |
时间 |
循环数 |
预变性** |
95℃ |
5 min |
1 |
变性 |
95℃ |
10 sec |
40 |
退火/延伸*** |
60℃ |
30 sec**** |
|
熔解曲线阶段***** |
仪器默认设置 |
1 |
2)三步法
循环步骤 |
温度 |
时间 |
循环数 |
预变性** |
95℃ |
5 min |
1 |
变性 |
95℃ |
10 sec |
40 |
退火*** |
55-60℃ |
20 sec |
|
延伸 |
72℃ |
20 sec**** |
|
熔解曲线阶段***** |
仪器默认设置 |
1 |
*高特异性可选择两步法,高效率扩增可选择三步法。
**预变性时间可根据不同模板和引物的具体情况适当缩短至2 min。
***退火温度和时间请根据引物和目的基因的长度进行调整。
****荧光信号采集请按照仪器使用说明书要求进行实验程序设置,几种常见仪器的时间设定如下:
30sec以上:Applied Biosystems: StepOne, StepOne Plus, 7500 Fast;Roche Applied Science: LightCycler 480;Bio-Rad: CFX96
31sec以上:Applied Biosystems: 7300
34sec以上:Applied Biosystems: 7500
*****熔解曲线通常情况下可以使用仪器默认程序。
定量实验至少需要三个生物学重复。反应结束后需要确认扩增曲线及熔解曲线。
1)扩增曲线
2)熔解曲线
a. 熔解曲线单峰,表明反应特异性好可以进行定量结果分析;若熔解曲线出现双峰或者多峰,则不能进行定量分析。
b. 熔解曲线出现双峰,需要通过DNA琼脂糖凝胶电泳判断非目标峰是引物二聚体还是非特异性扩增。
c. 如果是引物二聚体,建议降低引物浓度,或者重新设计扩增效率高的引物。
d. 如果是非特异性扩增,请提高退火温度,或者重新设计更高特异性的引物。
1) 推荐引物长度25 bp左右。扩增产物长度150 bp为佳,可以在100 bp-300 bp内选择。
2) 正向引物和反向引物的Tm值相差不宜超过2℃。引物Tm值60℃-65℃为佳。
3) 引物碱基分布要均匀,避免出现连续的4个相同碱基,GC含量控制在50%左右。3’端最后一个碱基最好为G或C。
4) 引物内部或者正反两条引物间最好避免出现有3个碱基以上的互补序列。
5) 引物特异性需要用NCBI BLAST程序进行核对。避免引物3’端有2个碱基以上的非特异性互补。
6) 设计完成的引物需要进行扩增效率的检测,只有具备相同扩增效率的引物才可用于定量比较分析。
5. 适用机型
Applied Biosystems: 7500, 7500 Fast, ViiA7, QuantStudio Dx, QuantStudio 3 and 5, QuantStudio 6,7,12k Flex;
Stratagene: MX3000P, MX3005P, MX4000.
注意事项
Ver.CN20231128
Q:建议qPCR 实验用几步法?
A:常用 2 步法。需提高扩增特异性,可选用 2 步法或提高退火温度。在扩增效率低, ct 值过大的时候,可以改用 3 步法或延长延伸时间。
Q:预变性 5 min 调整成了 10min,对于实验结果有影响吗?
A:有影响,预变性时间较长可能会影响酶的活性,导致 PCR 产物的产量有所降低。Q:qPCR 实验结果的有效性?为什么建议Ct 值要大于 15?
A:有效性要满足三个条件:(1)标准曲线:扩增效率范围:90-110%,对应斜率为 -3--3.5。 R2>0.98。 (扩增效率=10-1/斜率-1),当斜率=-3.32 时,扩增效率=100%。(2)扩 增曲线:S 型曲线,且 Ct 值在 15-35 之间,阴性对照 Ct>35 或无 Ct 值。(3)熔解曲线:为单一峰。
Ct 值大于 15 个循环是因为 3-15 个循环的荧光值标准差的 10 倍是荧光阈值,Ct 值太小了会影响曲线。
Q:同一基因复孔间熔解曲线 Tm 值有差异?
A:同样的扩增产物也会出现Tm 值有微小差异,一般差异在 1 度以内都可以接受。
Q:为什么稀释了模板CT 值反而变小了?
A:一般 CT 值与模板起始浓度呈负相关,浓度越高,CT 值越小。但也有很多特殊情况, 比如体系中存在抑制物或是模板不纯,这时候稀释模板反而能使 CT 值变低。
Q:内参CT 值小于 20,目的基因均大于 30,怎么办?
A:可能是目的基因为低丰度表达基因导致。建议:a)换用内参;b)换引物;c)换检测线性范围更广的qPCR mix。
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