What is Hoechst method?

Hoechst 33342 is used for specifically staining the nuclei of living or fixed cells and tissues. This stain is commonly used in combination with 5-bromo-2′-deoxyuridine (BrdU) labeling to distinguish the compact chromatin of apoptotic nuclei, to identify replicating cells and to sort cells based on their DNA content.

What is the difference between Hoechst and DAPI?

Hoechst dyes are typically used for staining DNA content in live cells due to its high cell membrane permeability. DAPI is typically used for staining DNA content in fixed cells due to its low membrane permeability.

What does a Hoechst stain show?

Hoechst dyes are commonly used to stain genomic DNA in the following applications: Fluorescence microscopy and immunohistochemistry, often with other fluorophores. Flow cytometry to count or sort out cells.

How does Hoechst bind to DNA?

Hoechst 33258 binds to DNA in two different modes: the high affinity (Kd 1–10 nM) binding results from the specific interaction with B-DNA minor groove and the low affinity (Kd ~1000 nM) reflects the nonspecific interaction with DNA sugar–phosphate backbone [22].

Does Hoechst bind to RNA?

Here the binding appeared to be non-specific, suggesting that the Hoechst compound, like aminoglycosides, can only specifically bind to RNA molecules containing non-duplex structural elements. Fluorescence titration of a Hoechst 33258 (0.2 µM) solution as a function of TS RNA concentration.

Is Hoechst membrane permeable?

Hoechst dyes – related dyes that are membrane permeable and emit blue fluorescence.

Why is DAPI used?

A simple-to-use fluorescent stain, 4′,6-diamidino-2-phenylindole (DAPI), visualizes nuclear DNA in both living and fixed cells. DAPI staining was used to determine the number of nuclei and to assess gross cell morphology. DAPI staining allows multiple use of cells eliminating the need for duplicate samples.

Will Hoechst stain dead cells?

Yes, Hoechst 33342 can stain dead cells, however Hoechst 33358 is the preferred dye that’s used for staining dead or fixed cells. Because of its ability to bind to DNA, Hoechst dyes can be used to observe nuclear condensation, thereby distinguishing apoptotic cells from healthy cells as well as necrotic cells.

Is Hoechst cell permeable?

Hoechst is a cell-permeable dye which stains the nucleus of both live and dead cells by intercalating in A-T region of DNA.

Is Hoechst toxic to cells?

Dyes that bind to DNA, such as Hoechst 33342, are commonly used to visualize chromatin in live cells by fluorescence microscopy. A caveat is that the probes themselves should not perturb cellular responses and under normal conditions the dyes are generally non-toxic.

What is FACS analysis?

Fluorescence activated cell sorting (FACS) analysis is a derivative of flow cytometry that proceeds in a slightly different direction. The primary objective of FACS is to physically sort a heterogeneous cell sample into separate populations. Isolated cells can then be used for further research.

Is DAPI excited by UV light?

Normally, DAPI bound to DNA is maximally excited by ultraviolet (UV) light at 358 nm, and emits maximally in the blue range, at 461 nm.

What is Bisbenzimide stain used for?

Bisbenzimide ( Hoechst 33342) is an organic compound used as a fluorescent stain for DNA in molecular biology applications. Several related chemical compounds are used for similar purposes and are collectively called Hoechst stains . Bisbenzimide tends to bind to adenine – thymine -rich regions of DNA and can decrease its density.

How do you use Bisbenzimide to separate DNA?

Bisbenzimide tends to bind to adenine – thymine -rich regions of DNA and can decrease its density. Bisbenzimide mixed with DNA samples can then be used to separate DNA according to their AT percentage using a cesium chloride (CsCl) gradient centrifugation.

What is the molecular weight of 1464 Bisbenzimide?

Bisbenzimide PubChem CID 1464 Synonyms Hoechst 33342 23491-52-3 Bisbenzimide Ho Molecular Weight 452.6 Date s Modify 2021-07-03 Create 2005-03-25

What is 2-2-(4-Ethoxyphenyl)-5-(4-methylpiperazin-1-yl)-2,5-bibenzimidazole?

2′- (4-ethoxyphenyl)-5- (4-methylpiperazin-1-yl)-2,5′-bibenzimidazole is a bibenzimidazole and a N-methylpiperazine. It has a role as a fluorochrome. It derives from a pibenzimol.