Name: isolation and cultivation of neural progenitors followed by chromatin-immunoprecipitation of histone 3 lysine 79 dimethylation mark
Uploaded: 2018-01-26T13:00:00
Description: Watch this Scientific Journal Video about Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark at JoVE.com

We thank Henriette Bertemes for helping to establish the CGN cultivation protocol within the lab. This method paper was supported by the DFG-funded CRC992 Medical Epigenetics by funding to TV. The authors acknowledge the support of the Freiburg Galaxy Team: Pavankumar Videm, Bj&#246;rn Gr&#252;ning and Prof. Rolf Backofen, Bioinformatics, University of Freiburg, Germany funded by Collaborative Research Centre 992 Medical Epigenetics (DFG grant SFB 992/1 2012) and German Federal Ministry of Education and Research (BMBF grant 031 A538A RBC (de.NBI)).

Animal welfare committees of the University of Freiburg and local authorities approved all animal experiments (G12/13, G16/11) mentioned in the following protocol.
1. Preparations
<ol>
	<li>Preparations for CPCs isolation
	<ol>
		<li>Set up timed mating to obtain embryos at different stages of cortex development (between E11.5 and E14.5). Use mice of the strain NMRI (Naval Medical Research Institute) which are at least 8 weeks old. After mating, consider a positive vaginal p...

<ol>
	<li>Molyneaux, B. J., Arlotta, P., Menezes, J. R. L., Macklis, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuronal+subtype+specification+in+the+cerebral+cortex.">Neuronal subtype specification in the cerebral cortex.</a> Nat. Rev. Neurosci. 8, 427-437 (2007).</li><li>Kandel, E. R., Squire, L. 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There are two major ways to perform chromatin immunoprecipitation to detect the genomic occupancy of histone modifications, transcription factors, histone code readers, writers, or erasers. One is the native ChIP method using nuclease digested, native chromatin for immunoprecipitation, and the other is the presented method using PFA-fixed, sheared chromatin, in which the nucleosomes and other DNA-attached proteins are covalently bound to the DNA39. Native ChIP with its high antibody detection rate...

The sensory, motor, and cognitive functions of the brain are highly complex and susceptible to physical and environmental changes. The brain consists of three general parts the hind-, mid-, and forebrain, which are deeply connected. Within the forebrain, the telencephalon can be divided into a dorsal telencephalon (DT) and a ventral telencephalon (VT). The DT of mice consists of six cortical layers which are formed between E11.5 and E18.5 in an &#34;inside-out&#34; manner1. The VT includes the ganglionic eminences in development, which later form the basal ganglia2,3. Several cell types can be classified in the mammalian central nervous system such as neurons, astrocytes, or oligodendrocytes4, which develop in a temporo-spatial manner5. First, the neural progenitor cells (NPCs) give rise to different kinds of neurons, interneurons in the VT, and projection neurons in the DT, and later on to glial cells (e.g., astrocytes6). During cortical development, the most superficial layer (layer I), which contains Cajal-Retzius cells, is formed first. Then, between E12.5 and E14.5, NPCs generate deeper neuronal layers (VI, V) while between 14.5 and 16.5, progenitors give rise to upper layer (IV-II) neurons7,8. Neuronal identity is specified by different morphogen-induced temporo-spatial transcriptional programs and additionally by epigenetic programs2.
The cerebellum, which is implicated in motor coordination, is located in the hindbrain and develops between E10 and roughly P20 in mice9. It contains the cerebellar cortex and the cerebellar nuclei10. The adult cerebellar cortex consists of three layers, the outermost molecular layer, the Purkinje cell layer, and the innermost granular layer containing granular neurons10. The cerebellar granule cells are the smallest neurons and represent about 80% of all neurons in the vertebrate brain11. They develop from precursors located in the external germinal zone and migrate through the Purkinje cell layer to their destination12. Like in the telencephalon, the development of the cerebellum is regulated by several important morphogens, which have specific time- and space-dependent functions and initiate defined transcriptional programs10.
The development of cortical and cerebellar layers is controlled by transcriptional expression of specific morphogens and, thus, by the chromatin state of the DNA. In a simplified view, chromatin states can be divided into euchromatin as transcriptionally active and heterochromatin as transcriptionally silent regions. The nucleosome as the basic unit of chromatin contains two copies of each core histone H2A, H2B, H3, and H4, surrounded by 147 base pairs of DNA13. Histones are highly post-translationally modified by methylation, acetylation, phosphorylation, ubiquitination, sumoylation, ADP-ribosylation, deamination, and proline isomerization14,15. Histone lysine methylation is considered to be the most stable histone modification that controls transcription, replication, recombination16, DNA-damage response17, and genomic imprinting18. Lysines can be mono-, di-, or tri-methylated19 and appear not only on the accessible histone tails but also within the globular domain of histones20. Specific methylations at H3K4 and H3K36 are mainly associated with euchromatin, specific methylations at H3K9, H3K27, or H4K20 are mainly found in heterochromatic regions, although all residues are located within the histone tail14,19,21. H3K79 methylation is located within the histone globular domain and has been associated with transcriptional activity, but also with transcriptionally inert genomic regions22. The modification is evolutionarily conserved since it has been observed in yeast, calf thymus, chicken, and human23. H3K79 mono, di, and trimethylation (H3K79me1, me2, me3) are catalyzed by the histone methyltransferases DOT1L24,25 and the Nuclear SET Domain-Containing Protein 2 (Nsd2)26. DOT1L is implicated in proliferation, DNA repair, and cellular reprograming27. Loss of Dot1l in mice leads to a prenatal death around the developmental stage E10.528,29. During heart development and in myocardiocyte differentiation, DOT1L is essential for gene expression regulation30. In the central nervous system, DOT1L function might be implicated in neural tube development31, it is involved in suppressing Tbr1-expression during forebrain development32, and may function in the regulation of ER-stress response genes33. The context-dependent activating or repressing action of H3K79me, especially with in vivo situations like the development of the central nervous system, is to date only partially understood32. Since H3K79 methylation is located in the globular domain of histone 3, it is sterically less accessible in comparison to modifications on the flexible histone tails23. To understand the function of H3K79 methylation, reliable and reproducible analysis methods to determine its location and genomic environment are needed. In this methods paper, we present isolation methods of different neural progenitors (CPCs for the cortex and CGNPs for the cerebellum), effective DOT1L inhibitor treatment, and a ChIP method to analyze H3K79 methylation via qPCR or sequencing at different time points during cortical and cerebellar development. For an overview of the protocol and its possibilities, see Figure 1.

<table>
	<tbody>
		<tr>
			<td>Anti-GAPDH</td>
			<td>Abcam</td>
			<td>ab8245</td>
			<td>Category: Antibody 
			Abbreviation/Comment: Immunoblot dilution 1:5000</td>
		</tr>
		<tr>
			<td>Anti-H3</td>
			<td>Abcam</td>
			<td>ab1791</td>
			<td>Category: Antibody 
			Abbreviation/Comment: Immunoblot dilution 1:3000</td>
		</tr>
		<tr>
			<td>Anti-H3K79me2</td>
			<td>Diagenode</td>
			<td>pAb-051-050</td>
			<td>Category: Antibody 
			Abbreviation/Comment: ChIP antibody</td>
		</tr>
		<tr>
			<td>Anti-H3K79me2</td>
			<td>Abcam</td>
			<td>ab-051-050</td>
			<td>Category: Antibody 
			Abbreviation/Comment: Immunoblot dilution 1:1000</td>
		</tr>
		<tr>
			<td>Anti-rabbit-IgG</td>
			<td>Diagenode</td>
			<td>C15410206</td>
			<td>Category: Antibody 
			Abbreviation/Comment: ChIP Ctrl antibody</td>
		</tr>
		<tr>
			<td>Anti-Tubulin alpha</td>
			<td>Abcam</td>
			<td>ab108629</td>
			<td>Category: Antibody 
			Abbreviation/Comment: Immunoblot dilution 1:3000</td>
		</tr>
		<tr>
			<td>Apo-Transferrin (1 mg/ml)</td>
			<td>Sigma-Aldrich</td>
			<td>T1147</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>B27 Supplement (50x)</td>
			<td>Life Technologies</td>
			<td>17504044</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>Bioanalyzer</td>
			<td>Agilent technologies</td>
			<td>G2940CA</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For analysis of sheared chromatin</td>
		</tr>
		<tr>
			<td>Bioruptor NextGen</td>
			<td>Diagenode</td>
			<td>B01020001</td>
			<td>Category: ChIP 
			Abbreviation/Comment: Ultrasonicator</td>
		</tr>
		<tr>
			<td>Boric acid pH 8.4</td>
			<td>Sigma Aldrich</td>
			<td>B6768</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CPC culturing</td>
		</tr>
		<tr>
			<td>CFX Connect RT PCR Detection System</td>
			<td>Bio-Rad</td>
			<td>1855201</td>
			<td>Category: ChIP Analysis 
			Abbreviation/Comment: Detection system for qPCR</td>
		</tr>
		<tr>
			<td>DMEM-F12</td>
			<td>Life Technologies</td>
			<td>11320-033</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CGM</td>
		</tr>
		<tr>
			<td>Dynabeads Protein A</td>
			<td>Invitrogen</td>
			<td>10001D</td>
			<td>Category: ChIP 
			Abbreviation/Comment: Magnetic beads, for ChIP</td>
		</tr>
		<tr>
			<td>EPZ-5676</td>
			<td>Selleckchem</td>
			<td>S7062</td>
			<td>Category: DOT1L inhibition 
			Abbreviation/Comment: For DOT1L inhibition in cell culture</td>
		</tr>
		<tr>
			<td>Ethylenediamine tetraacetic acid</td>
			<td>SERVA</td>
			<td>39760.01</td>
			<td>Category: ChIP 
			Abbreviation/Comment: EDTA</td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum 10% (v/v)</td>
			<td>Gibco</td>
			<td>10082147</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CPC isolation and CGM</td>
		</tr>
		<tr>
			<td>Glucose</td>
			<td>Sigma-Aldrich</td>
			<td>G5767</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CGNP isolation</td>
		</tr>
		<tr>
			<td>Glutathione (1.25 mg/ml)</td>
			<td>Sigma-Aldrich</td>
			<td>G4251</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>Glycine</td>
			<td>Carl Roth</td>
			<td>3187</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For cell fixation</td>
		</tr>
		<tr>
			<td>GoTaq mastermix</td>
			<td>Promega</td>
			<td>A6002</td>
			<td>Category: ChIP Analysis 
			Abbreviation/Comment: DNA polymerase master mix for qPCR</td>
		</tr>
		<tr>
			<td>Hank&#8217;s Balanced Salt Solution</td>
			<td>Life Technologies</td>
			<td>14025-100</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: HBSS</td>
		</tr>
		<tr>
			<td>L-glutamine (200 mM)</td>
			<td>Life Technologies</td>
			<td>25030081</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>Laminin</td>
			<td>Sigma-Aldrich</td>
			<td>L2020</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CPC culturing</td>
		</tr>
		<tr>
			<td>Lithium chloride</td>
			<td>Sigma-Aldrich</td>
			<td>L4408</td>
			<td>Category: ChIP 
			Abbreviation/Comment: LiCl</td>
		</tr>
		<tr>
			<td>N2 supplement</td>
			<td>Life Technologies</td>
			<td>17502048</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CGM</td>
		</tr>
		<tr>
			<td>NanoDrop 3300</td>
			<td>Thermo Fisher</td>
			<td>3300</td>
			<td>Category: ChIP 
			Abbreviation/Comment: Fluorospectrometer for DNA quantification</td>
		</tr>
		<tr>
			<td>NEB Next Ultra DNA Library Prep Kit for Illumina</td>
			<td>NEB</td>
			<td>E7645S</td>
			<td>Category: ChIP Analysis 
			Abbreviation/Comment: Kit for Library preparation</td>
		</tr>
		<tr>
			<td>NEBNext Multiplex Oligos for Illumina</td>
			<td>NEB</td>
			<td>E7335</td>
			<td>Category: ChIP Analysis 
			Abbreviation/Comment: Oligos for Library preparation</td>
		</tr>
		<tr>
			<td>Neurobasal medium</td>
			<td>Gibco</td>
			<td>21103049</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>NP-40 Alternative</td>
			<td>Calbiochem</td>
			<td>492016</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP buffer</td>
		</tr>
		<tr>
			<td>Paraformaldehyde</td>
			<td>Carl Roth</td>
			<td>335</td>
			<td>Category: ChIP 
			Abbreviation/Comment: PFA, for cell fixation</td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin-Neomycin 1% (v/v)</td>
			<td>Life Technologies</td>
			<td>15640055</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: PSN, for CCM and CGM</td>
		</tr>
		<tr>
			<td>Phosphate buffered saline</td>
			<td>Life Technologies</td>
			<td>10010023</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: PBS, for CPC isolation</td>
		</tr>
		<tr>
			<td>PicoGreen Kit</td>
			<td>Thermo Fisher</td>
			<td>P11496</td>
			<td>Category: ChIP Analysis 
			Abbreviation/Comment: Visualizing dye for DNA quantification</td>
		</tr>
		<tr>
			<td>Poly-D-lysine</td>
			<td>Sigma-Aldrich</td>
			<td>P6407</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CGNP isolation</td>
		</tr>
		<tr>
			<td>Poly-L-ornithine hydrobromide</td>
			<td>Sigma Aldrich</td>
			<td>P3655</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CPC culturing</td>
		</tr>
		<tr>
			<td>Potassium chloride</td>
			<td>Thermo Fisher</td>
			<td>AM9640G</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: KCl, for CGM</td>
		</tr>
		<tr>
			<td>Protease inhibitor</td>
			<td>Roche</td>
			<td>4693159001</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP</td>
		</tr>
		<tr>
			<td>Proteinase K</td>
			<td>Sigma-Aldrich</td>
			<td>3115879001</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP</td>
		</tr>
		<tr>
			<td>Qiagen MinElute</td>
			<td>Qiagen</td>
			<td>28004</td>
			<td>Category: ChIP 
			Abbreviation/Comment: Kit for DNA purification</td>
		</tr>
		<tr>
			<td>RNAse</td>
			<td>Sigma-Aldrich</td>
			<td>R6513</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP</td>
		</tr>
		<tr>
			<td>SGC0946</td>
			<td>Selleckchem</td>
			<td>S7079</td>
			<td>Category: DOT1L inhibition 
			Abbreviation/Comment: For DOT1L inhibition in cell culture</td>
		</tr>
		<tr>
			<td>Sodium bicarbonate</td>
			<td>Carl Roth</td>
			<td>8551.1</td>
			<td>Category: ChIP 
			Abbreviation/Comment: for Elution buffer</td>
		</tr>
		<tr>
			<td>Sodium chloride</td>
			<td>Carl Roth</td>
			<td>9265</td>
			<td>Category: ChIP 
			Abbreviation/Comment: NaCl, for ChIP buffer</td>
		</tr>
		<tr>
			<td>Sodium deoxycholate</td>
			<td>Sigma-Aldrich</td>
			<td>30970</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP</td>
		</tr>
		<tr>
			<td>Sodium dodecylsulfate</td>
			<td>Carl Roth</td>
			<td>183</td>
			<td>Category: ChIP 
			Abbreviation/Comment: SDS, for ChIP</td>
		</tr>
		<tr>
			<td>Sonic hedgehock (SHH)</td>
			<td>Sigma-Aldrich</td>
			<td>SRP6004</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CGNP isolation</td>
		</tr>
		<tr>
			<td>Superoxide dismutase (1mg/ml)</td>
			<td>Sigma-Aldrich</td>
			<td>S7571</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CCM</td>
		</tr>
		<tr>
			<td>Tris(hydroxymethyl)aminomethane</td>
			<td>Carl Roth</td>
			<td>9090</td>
			<td>Category: ChIP 
			Abbreviation/Comment: TRIS, for ChIP buffer</td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Carl Roth</td>
			<td>X100</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For ChIP buffer</td>
		</tr>
		<tr>
			<td>Trypsin-EDTA 0,05% (w/v)</td>
			<td>Sigma Aldrich</td>
			<td>59417C</td>
			<td>Category: Cell culture 
			Abbreviation/Comment: For CPC isolation</td>
		</tr>
		<tr>
			<td>Tween20</td>
			<td>Carl Roth</td>
			<td>28320</td>
			<td>Category: ChIP 
			Abbreviation/Comment: For bead preparation</td>
		</tr>
		<tr>
			<td colspan="4">Other Lab devices: Neubauer counting chamber, Incubator, Rotator, Shaker, Disection set, Water bath</td>
		</tr>
		<tr>
			<td>CCM: Cortical cell medium</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>CGM: CGNP cell culture medium</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

isolation and cultivation of neural progenitors followed by chromatin-immunoprecipitation of histone 3 lysine 79 dimethylation mark

Brain development is a complex process, which is controlled in a temporo-spatial manner by gradients of morphogens and different transcriptional programs. Additionally, epigenetic chromatin modifications, like histone methylation, have an important role for establishing and maintaining specific cell fates within this process. The vast majority of histone methylation occurs on the flexible histone tail, which is accessible to histone modifiers, erasers, and histone reader proteins. In contrast, H3K79 methylation is located in the globular domain of histone 3 and is implicated in different developmental functions. H3K79 methylation is evolutionarily conserved and can be found in a wide range of species from Homo sapiens to Saccharomyces cerevisiae. The modification occurs in different cell populations within organisms, including neural progenitors. The location of H3K79 methylation in the globular domain of histone 3 makes it difficult to assess. Here, we present methods to isolate and culture cortical progenitor cells (CPCs) from embryonic cortical brain tissue (E11.5-E14.5) or cerebellar granular neuron progenitors (CGNPs) from postnatal tissue (P5-P7), and to efficiently immunoprecipitate H3K79me2 for quantitative PCR (qPCR) and genome-wide sequencing.

General scheme of neural progenitor isolation, cultivation, H3K79me2 ChIP and ChIP analysis methods: Figure 1 shows a flowchart to perform H3K79me2 ChIP of cortical progenitor cells at different time points during embryonic brain development or of cerebellar granular neuron progenitors in postnatal stages. As a first step, the brain has to be isolated and the telencephalon (between E11.5 and E14.5) or the cerebellum (P5-P7) has to be retrieve...

Watch this Scientific Journal Video about Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark at JoVE.com

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

We present an effective and reproducible method to isolate and culture neural progenitor cells from embryonic and postnatal brain tissue for chromatin immunoprecipitation (ChIP) of histone 3 lysine 79 dimethylation (H3K79me2) - a histone mark located within the globular domain of histone 3.

Brain development is a complex process, which is controlled in a temporo-spatial manner by gradients of morphogens and different transcriptional programs. ...

The overall goal of this procedure is to analyze epigenetic modifications during brain development, especially in the cerebral cortex and the cerebellum. This method can be used to answer key questions in the neurobiology field, such as how histone modifications like H3K79 methylation can affect the development of cortical and cerebellar layering. The main advantage of this technique is that we can study in vivo the histone modifications, locus-specific or genome-wide, in distinct brain regions at specific developmental time points.Begin with brains from P5 to P7 and MRI mice. Remove all meninges and blood vessels. Then transfer three to five cerebella per chip into 15-milliliter tubes.Wash cerebellar with HBSS glucose before centrifugation. Centrifuge the tubes to collect the tissue. After the final wash, homogenize the cerebella by gently pipetting up and down two to three times with a one-milliliter pipette until the fragments are 0.5 to one-cubed millimeters in size.Gently remove all liquid until 2.5 milliliters are left. Then add 0.05%trypsin into the tube with HBSS glucose containing the cerebella. And incubate the tissue in a 37 degrees Celsius water bath for 15 minutes.Invert the tissue every one to three minutes. Following the incubation, stop the digestion by adding five milliliters of CGNP cell culture medium, or CGM, and collect the tissue by centrifugation as before. After centrifuging, remove the supernatant and add one milliliter CGM.Triturate the tissue with a one-milliliter pipette tip, avoiding the formation of air bubbles. Then add five milliliters of CGM and incubate the mixture for two minutes on ice to settle tissue remnants. Once the tissue has settled, transfer the supernatant into a new 15-milliliter tube.Then add two milliliters of CGM to the residual tissue and repeat the trituration procedure before harvesting the supernatant and discarding the tissue remnants. Pool the supernatants from each 15-milliliter tube of tissue and centrifuge to collect the cerebellar cells. Resuspend the pellet in 10 milliliters of CGM.Since astrocytes adhere faster and stronger to poly-D-lysine than CGNPs, add up to four milliliters of cell suspension to the wells of poly-D-lysine-coated 6-well plates and incubate for 20 minutes at 37 degrees Celsius to remove astrocytes. Shake the plate, collect the supernatant in a 15-milliliter tube and then centrifuge the supernatant as before. Resuspend the pellet in 10 milliliters of CGM and count the cells with a Neubauer counting chamber.After four to six hours, the adhered CGNPs appear round and are proliferative. Seed the cells in CGM on poly-L-ornithine-coated plates and incubate at 37 degrees Celsius, 5%CO2 and 100%relative humidity. After one day in vitro, or DIV1, most CGNPs are round and proliferate.Some CGNPs will start to differentiate and begin outgrowth of neuronal protrusions. To fix the cultured cells, add up to one milliliter of 1%PFA directly to the wells containing CGNPs. After a five-minute incubation at 22 degrees Celsius, add 53 microliters of glycine and wash twice with three milliliter of ice-cold PBS.Use a cell scraper to harvest the cells in one milliliter of PBS. Transfer the cells into 1.5-milliliter tubes and centrifuge for five minutes at 1, 000 g and four degrees Celsius. After removing the supernatant, add 700 microliters of lysis buffer containing protease inhibitor and incubate the samples for 15 minutes at four degrees Celsius.Vortex the samples every five minutes during this time. Following the incubation, divide the sample tubes to ensure that the volume does not exceed 400 microliters per tube. Then sonicate for 10 minutes at maximum power to shear the chromatin of the lyse cells.After 10 minutes, vortex the samples and then repeat the sonication and the vortexing two more times. Check the lysate for remaining nuclei with a phase contrast microscope or fluorescent microscope using DAPI. Pellet the cell remnants by centrifuging for 10 minutes at 13, 000 g and four degrees Celsius.When finished, use the supernatant for the preclearing step. To preclear the samples, first wash 20 micro liters of unconjugated magnetic beads per sample in ice-cold PBS Tween. Remove the washes with aid of a magnetic stand.Then add 600 microliters of dilution buffer and 20 microliters of washed magnetic beads to each sample for preclearing and incubate for two hours at four degrees Celsius on a rotator. Following the incubation, remove the beads using a magnetic stand. Then take 5%of each lysate as input samples and freeze them at minus 20 degrees Celsius.Antibody-coupling can be performed while the samples are being precleared. Wash 45 microliters of Protein A Magnetic Beads per chip with ice-cold PBS Tween, as before. After the final wash, add one milliliter of ice-cold PBS to the beads.Then add three micrograms of antibody per 45 microliter aliquot of beads. Incubate for two hours at four degrees Celsius on a rotator to bind the antibodies to the beads. When the incubation time has elapsed, resuspend washed antibody-coupled beads in one bead volume of ice-cold PBS.Divide each precleared extract into two tubes of approximately 643.5 microliters. Add the same volume of dilution buffer and antibody-bound beads and incubate the samples at four degrees Celsius overnight on a rotator. The next day, wash the beads with ice-cold chip buffers one through three for 10 minutes each on a rotator at four degrees Celsius, follow with three five-minute washes with TE buffer.Add elution buffer and dilute for one hour at 1, 400 RPM in a shaker at room temperature. Once the hour has elapsed, add 10 micrograms of Rnase to each chip sample and five micrograms to the input samples. Incubate the samples on the shaker for 30 minutes at 37 degrees Celsius.Finally, add 100 micrograms of Proteinase K per chip sample and 50 micrograms per input. Incubate overnight at 65 degrees Celsius at 1, 400 RPM. H3K79 dimethylation levels are decreased after three days of CPC culturing and DOT1L inhibition by SGC 0946.QCPR after chip analysis revealed that genes with high histone-3-lysine-79 methylation levels at baseline were most responsive to the inhibitor treatment. Genes with a lower H3K79 dimethylation coverage showed no significant change in methylation levels. This heat map shows that histone-3-lysine-79 methylation levels peak around the transcription start site and decrease toward the transcription end site.Once mastered, this technique can be done in about one week, if it is performed properly. After watching this video, you should have a good understanding in how to perform chromatin immunoprecipitation on histone modifications in isolated brain cells.

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