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【产品名称】
 MethylFlash羟甲基化DNA定量试剂盒(Fluorometric)
【订购货号】
 E14291
【产品CAS号码】
 无
【规格/价格】
 
【预计到货时间】
 30 天
【产品详细说明】
【本产品仅供科学研究使用】
【更新日期】 2012-2-29  
Product Overview


The MethylFlash™ Hydroxymethylated DNA Quantification Kit (Fluorometric) is a complete set of optimized buffers and reagents to fluorometrically quantify global DNA hydroxymethylation by specifically measuring levels of 5-hydroxymethylcytosine (5-hmC) without cross-reactivity to methylcytosine and unmethylated cytosine.

This kit is also specifically optimized for paired use with the MethylFlash Methylated DNA Quantification Kit (Fluorometric) for simultaneously quantifying both methylated DNA and hydroxymethylated DNA.

About 5-Hydroxymethylcytosine
5-hmC is a modified form of cytosine, recently discovered in animal tissues. The function of 5-hmC in epigenetics may be different from its forerunner 5-methylcytosine (5-mC) and currently remains a mystery. It is believed, though, that 5-hmC plays an important role in switching genes on and off. The presence of 5-hmC makes it necessary to not only re-evaluate existing DNA methylation data, but also necessary to determine the relative distribution and changes of 5-hmC in human tissues of healthy and diseased statuses. Prior to Epigentek’s MethylFlash™ technology, there were no methods that could be used for practically and routinely identifying 5-hmC and discriminating this base from 5-mC.

Distinguishing Between 5-hmC and 5-mC
Currently used methylated DNA analysis methods including restriction enzyme digestion and bisulfite or MeDIP-mediated MS-PCR and sequencing are not suitable for 5-hmC detection as 5-hmC and 5-mC are virtually indistinguishable between each other with these methods. To address this problem, Epigentek offers the MethylFlash™ Hydroxymethylated DNA Quantification Kit (Fluorometric) which uses a unique procedure to quantify global DNA hydroxymethylation. This product provides a cost-effective way to measure levels of 5-hydroxymethylcytosine and to distinguish between 5-hmC, 5-mC, and C. This allows for researchers to re-evaluate their DNA methylation data for DNA hydroxymethylation and to efficiently look for DNA hydroxymethylation in new DNA samples. The kit has the following advantages and features:

  • Fluorometric assay with easy-to-follow steps for convenience and speed. The entire procedure can be completed within 3 hours and 20 minutes.
  • High sensitivity, of which the detection limit can be as low as 10 pg of hydroxymethylated DNA from just 20 ng of input genomic DNA.
  • High specificity with no cross-reactivity to methylcytosine and unmethylated cytosine. 5-hydroxymethylcytosine is separately detected.
  • Universal positive and negative controls are included, which are suitable for quantifying hydroxymethylated DNA from any species.
  • Strip-well microplate format makes the assay flexible for either manual or high throughput analysis.
  • Simple, reliable, and consistent assay conditions.

Fig. 1. Schematic procedure of the MethylFlash™ Hydroxymethylated DNA Quantification Kit (Fluorometric).

Product Details


Principle & Procedure
The MethylFlash™  Hydroxymethylated DNA Quantification Kit (Fluorometric) contains all reagents necessary for the fluorometric quantification of global DNA hydroxymethylation. In this assay, DNA is bound to strip wells that are specifically treated to have a high DNA affinity. The hydroxymethylated fraction of DNA is detected using capture and detection antibodies and then quantified fluorometrically by reading the RFU (relative fluorescence units) in a fluorescence microplate spectrophotometer at excitation 530 nm and emission 590 nm. The amount of hydroxymethylated DNA is proportional to the fluorescence intensity measured, which can be calculated with the kit's included formulas for relative hydroxymethylation status of two different DNA samples or absolute quantification of 5-hydroxymethylcytosine (5-hmC) using a standard curve.


Fig. 2. Demonstration of high sensitivity and specificity of 5-hydroxymethylcytosine detection achieved by the MethylFlash™ kit. Synthetic unmethylated DNA (contains only cytosine), methylated DNA (contains only 5-methylcytosine), and hydroxymethylated DNA standard (contains only 5-hydroxymethylcytosine) were added into the assay wells at different concentrations and then measured with the MethylFlash™ Hydroxymethylated DNA Quantification Kit (Fluorometric).

Easy, Fast, and Flexible
The entire fluorometric assay has easy-to-follow steps for convenience and speed, which can be completed in 3 hours and 20 minutes. The strip-well microplate format allows for a flexible assay in manual or high throughput analysis. Universal positive and negative controls are included with the kit for quantifying hydroxymethylated DNA from any species such as mammals, plants, fungi, bacteria, and viruses.

Safe and Convenient
All the needed reagents, including negative controls and positive controls, for quantification of global DNA hydroxymethylation are conveniently packaged in the kit. The direct fluorometric quantification of DNA samples replaces obsolete or inferior methods and eliminates the need for DNA digestion/denaturation, radioactivity, extraction, or chromatography.

Highly Sensitive and Specific
The novel procedure and proprietary kit compositions allow for accurate quantification of hydroxymethylated DNA to be achieved with high sensitivity and specificity. The detection limit of the input DNA can be as low as 10 pg of hydroxymethylated DNA with a dynamic range from  10 pg to 5 ng (see Fig. 2). Analytic sensitivity is about ten-fold higher than that obtained by HPLC (0.008% vs 0.08%). There is no cross-reactivity to methylcytosine and unmethylated cytosine so that only hydroxymethylated DNA (5-hmC) is detected.

Responsive, Reliable, and Practical
Based on its working principle and the microplate format, the kit can be practically and routinely used for any species from a variety of forms including from cultured cells, fresh and frozen tissues, paraffin-embedded tissues, plasma/serum samples, and body fluid samples. To demonstrate the capabilities of the kit, it has been successfully used for quantifying the content of 5-hmC in DNA from mouse brains and HeLa cells. The percentage of 5-hmC measured by the MethylFlash kit is parallel and comparable to that detected by HPLC and LC-MS methods (see Table 1). Through the use of the kit, a high abundance of 5-hmC in normal human brains and colon tissues is discovered for the first time. Furthermore, it shows that 5-hmC accounts for 32% and 16% of total methylated cytosine (5-mC plus 5-hmC) in normal human brains and colon tissues, respectively (see Table 2). In contrast, 5-hmC is low or absent in colon cancer cell lines (HCT116) and cervical cancer cell lines (HeLa).

  MethylFlash HPLC1 LC-MS2
Mouse Brain 0.16% 0.55% 0.13%
HeLa Cells < 0.02% undetectable not determined

Table 1. Comparison of the MethylFlash™ Hydroxymethylated DNA Quantification Kit and chromatography-based methods for the detection of 5-hydroxymethylcytosine, shown in percentage of 5-hmC present in two DNA sample types.

Kriaucionus S et al: Science, 324: 929-930, 2009
Munzel M et al: Angewandte Chemie, 122: ePub, 2010

  % 5-hmC % 5-mC 5-hmC/(5-mC + 5-hmC)
Human Brain 0.67% 1.00% 40.00%
Mouse Brain 0.16% 1.53% 10.00%
Human Placenta 0.06% 0.67% 8.00%
Human Colon 0.47% 1.46% 24.00%
HCT116 < 0.01% 1.30% < 1.00%
HeLa < 0.02% 1.62% < 1.00%

Table 2. Percentage of 5-hmC and 5-mC in different tissues/cells, measured with the MethylFlash™ Hydroxymethylated DNA Quantification Kit and the MethylFlash™ Methylated DNA Quantification Kit, respectively.

Product Components


HF1 (10X Wash Buffer)
HF2 (Binding Solution)
HF3 (Negative Control I, 20 µg/ml)*
HF4 (Negative Control II, 20 µg/ml)*
HF5 (Positive Control, 20 µg/ml)*
HF6 (Capture Antibody, 1000 µg/ml*
HF7 (Detection Antibody, 400 µg/ml)*
HF8 (Enhancer Solution)*
HF9 (Fluoro Developer)*
HF10 (Fluoro Enhancer)*
HF11 (Fluoro Dilutor)
8-Well Assay Strips (With Frame)
User Guide

* Spin the solution down to the bottom prior to use.

Note: The HF3 Negative Control I is an unmethylated polynucleotide containing 20% of cytosine. The HF4 Negative Control II is a methylated polynucleotide containing 20% of 5-methylcytosine. The HF5 Positive Control is a hydroxymethylated polynucleotide containing 20% of hydroxymethylcytosine.

User Guide & MSDS


[User Guide]*
*Always use the actual User Guide that shipped with your product. Is the above file locked? You can also request user guides by emailing info@epigentek.com along with your contact information and institution name.

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