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MethylFlash Hydroxymethylated DNA 5-hmC Quantification Kit (Colorimetric)


For absorbance-based quantitation of global DNA hydroxymethylation in an ELISA-like format

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Suggested Workflow
DNA Isolation
DNA Methylation Quantification
Schematic procedure of the MethylFlash™ Hydroxymethylated DNA Quantification Kit.
Demonstration of high sensitivity of 5-hydroxymethylcytosine detection achieved by the MethylFlash kit. Synthetic hydroxymethylated DNA was added into the assay wells at different concentrations and then measured with the MethylFlash Hydroxymethylated DNA Quantification Kit.
Demonstration of high 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 (Colorimetric).
Input Type: DNA
Research Area: DNA Methylation
Target Application: Amount Quantitation
Vessel Format: 96-Well Plate
100% Guarantee: 6 months
Catalog No.SizePriceQty
P-1036-4848 assays $339.00 
P-1036-9696 assays $589.00 
Order now & get it by Wednesday, December 11th  
Product Overview

We recommend using a newer version of this product: MethylFlash Global DNA Hydroxymethylation (5-hmC) ELISA Easy Kit (Colorimetric) 


The MethylFlash™ Hydroxymethylated DNA Quantification Kit (Colorimetric) is a complete set of optimized buffers and reagents to colorimetrically quantify global DNA hydroxymethylation by specifically measuring levels of 5-hydroxymethylcytosine (5-hmC) without cross-reactivity to methylcytosine and unmethylated cytosine, in an ELISA-like microplate-based format.

This kit is also specifically optimized for paired use with the MethylFlash Methylated DNA Quantification Kit (Colorimetric) 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 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 5hmC, 5mC, 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:

  • Colorimetric assay with easy-to-follow steps for convenience and speed. The entire procedure can be completed within 3 hours and 45 minutes.
  • High sensitivity, of which the detection limit can be as low as 40 pg of hydroxymethylated DNA and accepts as low as 50 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.

Comparison of Available ELISA-based Global DNA Methylation Assay Methods 


 MethylFlash (Colorimetric)Competitor Z
Assay Principle Direct ELISA - Detection antibody specifically and directly detects 5-hmC Indirect ELISA - Detection antibody detects dsDNA, (detected signals is dependent only on intact DNA strands and does not quantify actual total 5-hmC)
Format 96-well plate 96-well plate
Sensitivity Excellent detection limit of 0.04 ng of 5-hmC DNA Unclear, as the detected signals are from intact DNA strands
S/N Ratio >20 with very low background  <4 with high background
Procedural Convenience No need for plate blocking and denaturation of DNA Requires plate blocking and DNA denaturation
Protocol Time  <4 hr  <5 hr
DNA Type & Species Universal for any species, both ssDNA and dsDNA Only ssDNA from limited number of species 
Specificity High, the antibody only detects 5-mC Unclear, as the assay principle is not reasonable
Quantification Type Both relative and absolute quantification Relative only
Standard Control Stable, quantitative in absolute amount of 5-mC, and can be universally used for any species Unclear
Minimum Input Amount 50 ng 100 ng
Accuracy of Detection Stable and quantified standard control with proven close correlation with HPLC-MS analysis by users Unclear, based on biased assay principle
% 5-mC Calculation Simple Complicated
Patented Method Yes No
Popularity Very high published citation count Low published citation count
Support Expertise Since 2006 Since 2012


Product Details

Principle & Procedure
The MethylFlash™  Hydroxymethylated DNA Quantification Kit (Colorimetric) contains all reagents necessary for the colorimetric 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 through an ELISA-like reaction by reading the absorbance in a microplate spectrophotometer at 450 nm. The amount of hydroxymethylated DNA is proportional to the OD 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.

Easy, Fast, and Flexible
The entire colorimetric assay has easy-to-follow steps for convenience and speed, which can be completed  in 3 hours and 45 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 colorimetric 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 40 pg of hydroxymethylated DNA with a dynamic range from  40 pg to 20 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 (see Fig. 3).

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) (see Fig. 4A and 4B). 

  MethylFlash LC-MS1
Mouse Brain 0.16% 0.13%
HeLa Cells < 0.02% 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.

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.

Fig. 2. Demonstration of high sensitivity of 5-hydroxymethylcytosine detection achieved by the MethylFlash™ kit. Synthetic hydroxymethylated DNA was added into the assay wells at different concentrations and then measured with the MethylFlash™ Hydroxymethylated DNA Quantification Kit.

Fig. 3. Demonstration of high 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.

Fig. 4. Demonstration of a high abundance of 5-hydroxymethylcytosine in human brain and colon tissues. 200 ng of DNA isolated from different tissues or cells were added into the assay wells and the hydroxymethylated fraction of DNA was measured using the MethylFlash™ Hydroxymethylated DNA Quantification Kit. A: OD intensity measured in variety of DNA samples. B: Percentage of hydroxymethylated DNA in various tissues and cells.

User Guide & MSDS

[User Guide]*
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[Safety Data Sheet]
Product Citations

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Customer Reviews

Rating by w******* Verified Purchase Reviewed on: Friday 02 March, 2018
Application Description
Used to determine DNA hydroxymethylation levels in mouse hippocampus.
The assay is straightforward and easy to use. Level of hydroxymethylation however are not similar to those obtained by sequencing.
BisulPlus Loci 5mC & 5hmC Detection PCR kit
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