Nuclei Purification
Nuclei Purification - Related Videos
03:05
Gradient Centrifugation Based Purification of Nuclei: A Technique to Obtain Ultrapure Fraction of Intact Nuclei Using Density Gradient Centrifugation
0 Views •
2023
In this video, we describe a simple and efficient protocol using gradient centrifugation to isolate single nuclei. Once isolated, these nuclei can be used for sequencing and genome analysis.
03:55
Isolation of Nuclei from Fresh Frozen Glioma Tissues: A Method to Obtain Intact Nuclei from Glioma Tumor Samples
0 Views •
2023
This video describes the protocol to isolate single-nuclei from fresh frozen glioma tissue. The isolated single-nuclei can be used as specimens for sequencing techniques such as single-nuclei RNA (snRNA) sequencing and single-nuclei Assay for Transposase-Accessible Chromatin (snATAC) sequencing to obtain deeper insights into inter- and intra-tumor heterogeneity observed in glioma of the central nervous tissues.
08:16
Plasmid Purification
0 Views •
2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
10:12
Isolation of Cardiomyocyte Nuclei from Post-mortem Tissue
0 Views •
Cited by 61 •
2012
Cardiac nuclei are isolated via density sedimentation and immunolabeled with antibodies against pericentriolar material 1 (PCM-1) to identify and sort cardiomyocyte nuclei by flow cytometry.
06:30
Gel Purification
0 Views •
2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
FAQs
Controlled lysis balances cellular disruption with nuclear preservation. Mechanical or detergent-based lysis must release nuclei from cells or tissues without compromising their integrity. If disruption is inadequate, cytoplasmic material may remain; if it is excessive, the recovered nuclei may be damaged. This balance directly influences the reliability of DNA, RNA, chromatin, epigenetic, imaging, and single-nucleus analyses.
Filtration and differential centrifugation provide complementary cleanup steps. Filtration helps remove unwanted material based on physical passage through the filter, while differential centrifugation separates components according to how they sediment. Used sequentially, these steps reduce cytoplasmic carryover and enrich the nuclear fraction before downstream analyses or an additional density-gradient separation.
Density-gradient separation adds a further refinement step after lysis, filtration, and differential centrifugation. It can help distinguish the nuclear fraction from remaining cellular components and improve enrichment when the initial separation is insufficient. This additional processing is useful when downstream molecular or structural measurements require a cleaner preparation and reduced interference from nonnuclear material.
Nuclear integrity and purity determine how confidently downstream results can be interpreted. Damaged nuclei may compromise structural observations, while residual cytoplasmic components can affect molecular measurements. Because purified nuclei may support DNA and RNA analysis, chromatin and epigenetic profiling, imaging, and single-nucleus sequencing, preparation quality can influence whether observed disease-associated changes reflect biology or sample contamination.
A typical workflow begins with controlled mechanical or detergent-based lysis to release nuclei, followed by filtration to remove unwanted material. Differential centrifugation then enriches the nuclear fraction, and density-gradient separation may provide additional cleanup. The resulting preparation is directed toward the selected molecular or structural analysis, with the sequence adapted to the tissue and intended measurement.
This approach is especially valuable when whole tissues are difficult to dissociate or contain fragile, rare, or archived cells. Isolating nuclei can provide an analyzable material even when obtaining intact cells is challenging. Researchers can then examine nuclear DNA, RNA, chromatin, epigenetic features, morphology, or single-nucleus profiles in samples that might otherwise be difficult to study.
Purified nuclei support several complementary forms of biomedical analysis. Their DNA and RNA can be examined, while chromatin and epigenetic profiling can reveal nuclear molecular states. Imaging contributes structural information, and single-nucleus sequencing enables analysis at the level of individual nuclei. Together, these outputs can help investigate disease-associated molecular changes while preserving a nuclear perspective.