Enabling Epigenetics Research

CUT&Tag-IT® Core Assay Kit
Catalog No. 53176 (16 rxns)(Version A1)
US Pat. No. 10,689,643, EP Pat. No. 2999784
and related patents and applications

Copyright 2024 Active Motif, Inc.

Information in this manual is subject to change without notice and does not constitute a
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Contents
Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Kit Components and Storage  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2
CUT&Tag-IT® Core Assay Kit Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
Prepare Fresh Cells (30 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
Bind Cells to Concanavalin A Beads (30 minutes)  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
Bind Primary Antibody (2 hours to overnight)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
Bind Secondary Antibody (60 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
Bind CUT&Tag-IT®Assembled pA-Tn5 Transposomes (60 minutes) . . . . . . . . . . . .  6
Tagmentation (60 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
DNA Extraction (60 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
Technical Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

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Overview
Cleavage Under Targets and Tagmentation (CUT&Tag) is a method to investigate genomic
localization of histone modifications and some transcription factors that reveals interactions
between proteins and DNA or identifies DNA binding sites for proteins of interest1.
Unlike MNase-Seq or ATAC-Seq methods that target open chromatin and are therefore
dependent on chromatin accessibility, CUT&Tag utilizes an antibody-based enzyme tethering
strategy to target specific histone modifications or proteins to reveal chromatin-binding
information that is specific to those sites or proteins of interest.
CUT&Tag is based on the same principles as ChIP-Seq, but with several changes to theprotocol that are advantageous in certain situations. Instead of the sonication of fixedchromatin and immunoprecipitation steps performed in ChIP-Seq protocols, in CUT&Tag, fresh(not frozen) unfixed cells are bound to concanavalin A beads and the antibody incubation is
performed with cells in their native state. Directly following antibody binding, the chromatin
is sheared and NGS libraries are prepared in a single step by tagmentation using the protein
A-Tn5 (pA-Tn5) transposome enzyme that has been pre-loaded with sequencing adapters.
The CUT&Tag-IT® Core Assay Kit is optimized for 50,000 to 500,000 cells per reaction,although 200,000 cells are recommended. This Kit provides optimized reagents and protocol
to perform 16 CUT&Tag reactions and yields purified DNA that can be amplified and indexed
for NGS sequencing. This kit does not include indexing primers or DNA polymerase forlibrary amplification.
CUT&Tag-IT® Core Assay Kit Advantages•

Compatible with as few as 5,000 cells•

Low background signal enables lower sequencing depth•

Use your own indexing primers and DNA polymerase for library creation•

No artifacts caused by formaldehyde crosslinking
Product

FormatCatalog No.

CUT&Tag-IT® Core Assay Kit

16 rxns

53176

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Kit Components and Storage
The kit contains sufficient reagents for 16 CUT&Tag Assay reactions. The reagents in this kit
have multiple storage temperatures. Please store components according to the storage
conditions below. All reagents are guaranteed stable for 6 months from date of receipt whenstored properly.
Reagents

Quantity

Storage

5% Digitonin

610 µL-20°C

Concanavalin A Beads

320 µL

4°C

CUT&Tag-IT™ Assembled pA-Tn5 Transposomes

16 µL

-20°C

Tagmentation Buffer

2 mL

4°C or -20ºC

1X Binding Buffer

55 mL

4°C

1X Wash Buffer

40 mL

4°C

Dig-Wash Buffer

50 mL

4°C

Antibody Buffer

800 µL

4°C

Dig-300 Buffer

50 mL

4°C

Guinea Pig Anti-Rabbit Antibody

16 µL

-20°C

Rabbit Anti-Mouse Antibody

16 µL

-20°C

Protease Inhibitor Cocktail

1.42 mL-20°C

0.5M EDTA

68 µL

RT

10% SDS

20 µL

RT

10 µg/µL Proteinase K

18 µL

-20°C

16 columns

RT

DNA Purification Binding Buffer

10 mL

RT

DNA Purification Wash Buffer

12 mL

RT

DNA Purification Elution Buffer

560 µLRT

3M Sodium Acetate

128 µLRT

DNA Purification Columns

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Additional Materials Required•

Molecular grade nuclease free water•

100% Ethanol•

80% Ethanol•

Magnetic Rack for 1.5/2 mL tubes•

Magnetic Rack for 200 µL 8-well PCR strip tubes•

Nutator or orbital rotating mixer•

Vortexer•

Thermal cycler•

NGS indexing primers•

DNA Polymerase for library creation•

1.5 mL Low-bind Microcentrifuge tubes•

2 mL Low-bind Microcentrifuge tubes•

Microcentrifuge for 8-well PCR strip tubes with caps, or for 0.2 and 1.5 mL tubes•

Multichannel pipette (20 - 200 µL)•

Filter tips for pipettes

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CUT&Tag-IT® Core Assay Kit Protocol
This Kit is optimized for 50,000 to 500,000 cells, although 200,000 cells are recommended.
Note:

This protocol is optimized for non-adherent cells. If adherent cells are to
be used, avoid using Trypsin or cell detachment solutions that digest cell
membrane proteins. Cell membrane proteins are necessary to bind the cells
to the Concanavalin A Beads in Section B of the assay. To lift adherent cells
from growth plates, use an enzyme-free dissociation method such as scraping
with a rubber policeman.

Prepare Fresh Cells (30 minutes)
Note:

Before using 1X Wash Buffer in Step 3 below, you must add Protease Inhibitor
Cocktail to the 1X Wash Buffer. Add 10 µL Protease Inhibitor Cocktail for every
1 mL of 1X Wash Buffer. 2.5 mL total are used per cell sample. Keep on ice.
Wash Buffer can be stored at 4°C for up to 1 week once Protease Inhibitor
Cocktail has been added.

1.

Harvest fresh culture(s) at room temperature and count cells. Place the desired
amount of cells into a 1.5 mL microcentrifuge tube.

2.

Centrifuge for three minutes at 600 x g at room temperature, thenremove supernatant.

3.

Resuspend in 1 mL 1X Wash Buffer at room temperature, then centrifuge for anotherthree minutes at 600 x g at room temperature, and remove supernatant.

4.

Resuspend in 1.5 mL 1X Wash Buffer and transfer to a 2 mL microcentrifuge tube.
Place tube with resuspended pellet on ice while the beads are prepared in thenext steps.

Bind Cells to Concanavalin A Beads (30 minutes)
Note:This Kit is optimized for 50,000 to 500,000 cells. Best results have beenobtained with 200,000 cells. 500,000 cells can become viscous in the steps
below (Bind Cells to Concanavalin A Beads, Steps 5-9) and DNA purification.

5.

Gently resuspend and withdraw enough of the Concanavalin A Bead slurry such that
there will be 20 µL per each sample. Use 20 µL for up to 500,000 cells. The following
steps are written for 1 sample of a 500,000 cells reaction. Do not adjust the volumes
for lower cell numbers.

6.

Into a 2 mL tube, transfer 20 µL Concanavalin A bead slurry into 1.6 mL 1X Binding
Buffer and mix by pipetting. Place the tube on a magnetic stand to clear (30 seconds
to 2 minutes).

7.

Withdraw the liquid completely and remove the tube from the magnetic stand. Add
1.5 mL 1X Binding Buffer, mix by pipetting, and collect any liquid from the sides or cap
with a quick pulse spin in a microcentrifuge.

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8.

Place tube on magnetic stand to clear (30 seconds to 2 minutes), and remove liquidby pipette. Resuspend in 20 µL 1X Binding Buffer (20 µL per 500,000 cells sample)
and keep the tube containing prepared Concanavalin A Beads at room temperature
until the fresh cells are ready.

9.

Slowly add the bead slurry from Step 8 and invert tube to mix. Place the tube
containing the cells and Beads on an end-over-end rotator for 10 minutes.

Bind Primary Antibody (2 hours to overnight)
Note:

Before using Antibody Buffer in Step 11 below, you must add Protease
Inhibitor Cocktail and Digitonin. For every 1 mL of buffer to be used, add
10 µL of Protease Inhibitor Cocktail and 10 µL of 5% Digitonin. Keep on ice.
Antibody Buffer can be kept at 4°C for up to 2 days once Protease Inhibitor
Cocktail and Digitonin have been added. For each reaction, you will need
50 µL supplemented with 0.5 µL Protease Inhibitor Cocktail and 0.5 µL of
5% Digitonin.

10. After a quick spin (<100 x g) to remove liquid from the cap, place the tubes ona magnetic stand to clear (30 seconds to 2 minutes), and remove the liquid via
a pipette.
11. Resuspend cells in a volume of ice-cold Antibody Buffer such that each sample is in a
50 µL volume, not to exceed 500,000 cells per 50 µL. Gently vortex. Place the tube
on ice.
12. Add 1 µL (or at least 1 µg) undiluted primary antibody to each sample, and gently
vortex or pipette to mix.
Note:

Use a rabbit or mouse primary antibody. We recommend using a 1:50 to 1:100
dilution or the antibody manufacturer’s recommendation for the dilution used
in applications such as immunofluorescence. Histone H3K27me3 (Catalog No.
39157) is a common mark that can be a positive control.

13. Incubate 2 hours to overnight at 4°C with orbital mixing, make certain liquid stays
together in the bottom of the tube so that it all mixes together.

Bind Secondary Antibody (60 minutes)
Note:

Before using Dig-Wash Buffer in Step 15 below, you must add Protease
Inhibitor Cocktail and Digitonin. For every 1 mL of buffer, add 10 µL Protease
Inhibitor Cocktail and 10 µL of 5% Digitonin. 3.1 mL total are used per sample.
Keep on ice. Dig-Wash Buffer can be kept at 4°C for up to 2 days once
Protease Inhibitor Cocktail and Digitonin have been added.

Note:

Choose the right secondary antibody for the reactions! If a mouse primary
antibody was used, then use the Rabbit Anti-Mouse Secondary Antibody.
If a rabbit primary antibody was used, then use the Guinea Pig Anti-Rabbit
Secondary Antibody.

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514. After a quick spin (<100 x g), place each tube on a magnetic stand to clear (30seconds to 2 minutes), and then remove the liquid via a pipette.
15. Dilute the secondary antibody 1:100 in Dig-Wash Buffer. 100 µL of the diluted
secondary are needed per reaction. Add 100 µL of this diluted secondary antibody toeach sample while gently vortexing to dislodge the beads from the sides of the tube.
16. Place the tubes on an orbital rotator at room temperature for 60 minutes.
17. After a quick spin, place the tubes on a magnetic stand to clear (30 seconds to 2
minutes), then remove the liquid via a pipette.
18. Add 1 mL Dig-Wash Buffer to each reaction. Gently vortex or pipette to dislodge any
beads that have aggregated together.
19. Repeat Step 18 twice, for a total of three washes.

Bind CUT&Tag-IT®Assembled pA-Tn5 Transposomes (60 minutes)
Note:

Before using Dig-300 Buffer in Step 20 below, you must add Protease
Inhibitor Cocktail and Digitonin. For every 1 mL of buffer, add 10 µL Protease
Inhibitor Cocktail and 2 µL of 5% Digitonin. 3.1 mL total are used per sample.
Keep on ice. Dig-300 Buffer can be kept at 4°C for up to 2 days once
Protease Inhibitor Cocktail and Digitonin have been added.

20. Dilute the CUT&Tag-IT Assembled pA-Tn5 Transposomes with Dig-300 Buffer to a
final concentration of 1:100. 100 µL will be needed per reaction. For example, for one
reaction, add 1 µL of the CUT&Tag-IT™ Assembled pA-Tn5 Transposomes to 100 µL of
Dig-300 Buffer.
21. After a quick spin (<100 x g), place each tube containing the immunoprecipitatedsamples on a magnetic stand to clear (30 seconds to 2 minutes), and then remove
the liquid via a pipette.
22. Add 100 µL of the diluted CUT&Tag-IT™ Assembled pA-Tn5 Transposomes from Step
20 while gently pipetting to make sure it mixes together.
23. Incubate the reactions at room temperature on an orbital rotator for 60 minutes.
24. After a quick spin (<100 x g), place the tubes on a magnetic stand to clear (30seconds to 2 minutes) and remove the liquid with a pipette.
25. Add 1 mL Dig-300 Buffer. Gently vortex or pipette to dislodge the beads.
26. Repeat Step 25 twice for a total of three washes.

Tagmentation (60 minutes)
Note:

Before using Tagmentation Buffer, you must add Protease Inhibitor Cocktail
and Digitonin. For every 1 mL of Tagmentation Buffer to be used, add 10 µL
Protease Inhibitor Cocktail and 2 µL of 5% Digitonin.

27. After a quick spin (<100 x g), place the tubes on a magnetic stand (30 seconds to 2
minutes) and remove the liquid with a pipette.
28. Add 125 µL Tagmentation Buffer while gently vortexing or pipetting to mix each tube.
29. Incubate tubes at 37°C for 60 minutes.
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DNA Extraction (60 minutes)
30. To stop tagmentation and solubilize DNA fragments, add to each sample:
4.2 µL 0.5 M EDTA
1.25 µL 10% SDS
1.1 µL Proteinase K (10 mg/mL)
31. Mix by vortexing at full speed briefly for approximately two seconds, and incubate for
60 minutes at 55°C to digest.
Note:

It is typical for the beads to form a large clump during incubation withProteinase K and SDS due to the viscoelasticity of DNA. However, forabundant genome-wide epitopes, large-scale fragmentation of the genome
will normally result in reduced clumping and release of beads into suspension,
turning the liquid brownish relative to negative controls.

32. After a quick spin (<100 x g), place the tubes on a magnetic stand (30 seconds to 2
minutes) and transfer the liquid with a pipette into a new 1.5 mL microcentrifuge tube.
Note:

If the sample is too viscous, preventing the supernatant from being transferred,add 625 µL DNA Purification Binding Buffer, pipette up and down, place again
on the magnetic stand and transfer to a new tube. Proceed to step 34.

33. Add 625 µL DNA Purification Binding Buffer to each sample and mix by pipetting
up and down. If the color indicator turns violet or orange, add 8 µL of 3 M
Sodium Acetate.
34. For each sample, place a labeled DNA Purification Column into a collection tube.
35. Transfer each sample to its corresponding column, close the cap, and centrifuge at
17,000 x g (~14,000 rpm) for 1 minute.
36. Discard the flow-through and return the collection tube to the column.
Note:

100% Ethanol must be added to the DNA Purification Wash Buffer before thefirst use, to a final concentration of 80% (40 mL of 100% Ethanol to the DNA
Purification Wash Buffer bottle).

37. Add 750 µL of DNA Purification Wash Buffer (prepared above) to the column and cap
the column. Centrifuge at 17,000 x g for 1 minute.
38. Discard the flow-through and return the collection tube to the column. Centrifuge theempty tube at 17,000 x g for 2 minutes to remove any remaining DNA Purification
Wash Buffer.
39. Transfer each column to a new microcentrifuge tube and add 35 µL of DNA
Purification Elution Buffer to the center of the column matrix, cap the column, andincubate at room temperature for 1 minute.

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740. Centrifuge at 17,000 x g for 1 minute. Discard the column. The DNA purificationis complete, and is ready for next-gen library creation compatible with dual-index
primers (Nextera) for Illumina® sequencing. The DNA can be stored at -20°C or you
may proceed to PCR Amplification. You will need indexing primers, and high-fidelity
DNA polymerase. For an example protocol please refer to our complete CUT&Tag-IT
Assay Kit manuals (Catalog Nos. 53160 or 53165).

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8References1.

Kaya-Okur, H.S., et al. (2019) Nature comm. 10:1930 (1).

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9Technical Services

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