Related Experiment Video
Updated: May 6, 2026
07:42
Chromosome Preparation From Cultured Cells
Published on: January 28, 2014
82.8K
Identifying different types of chromatin using Giemsa staining.
Juan C Stockert1, Alfonso Blázquez-Castro, Richard W Horobin
1Department of Biology, Faculty of Sciences, Autonomous University of Madrid, Cantoblanco, Madrid, Spain.
Methods in Molecular Biology (Clifton, N.J.)
|October 29, 2013
Summary
Giemsa stain, a mix of methylene blue and eosin Y, colors DNA purple and RNA blue. This differential staining reveals chromosome bands and DNA composition, aiding in chromosome structure analysis.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Giemsa stain mixtures, combining methylene blue and eosin Y, are standard biological stains.
- The Romanowsky-Giemsa effect produces a distinct purple coloration of chromatin DNA.
- This staining contrasts with blue-stained RNA in cytoplasm and nucleoli.
Purpose of the Study:
- To explore the utility of Giemsa stain for visualizing specific chromosome structures.
- To elucidate the molecular mechanisms underlying Giemsa staining of chromatin.
- To explain differential staining patterns based on DNA composition and chromosome organization.
Main Methods:
- Application of Giemsa stain to biological samples.
- Utilizing specific prestaining treatments to induce chromatin disorganization (banding).
- Observing differential coloration of chromosome bands (C-bands, G-bands) and chromatids.
Main Results:
- Giemsa stain induces purple coloration in chromatin DNA and blue in RNA.
- Differential staining reveals C- and G-bands as purple, with other regions blue.
- Unsubstituted (TT) DNA stains purple, while bromo-substituted (BT) DNA stains blue.
- BT and BB chromatids exhibit distinct coloration.
Conclusions:
- Giemsa staining is a valuable method for revealing detailed chromosome structure.
- The staining mechanism involves differential interaction with DNA and RNA components.
- Understanding Giemsa staining aids in analyzing chromosome organization and DNA modifications.
More Related Videos
Related Concept Videos
01:17Karyotyping
49.5K
Overview
49.5K
01:26Differential Staining Technique
2.7K
Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...
2.7K
01:01Euchromatin
6.8K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
6.8K
01:03Fixation and Sectioning
6.0K
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
6.0K
02:36Chromatin Immunoprecipitation- ChIP
9.5K
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
9.5K
02:04Polytene Chromosomes
9.3K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
9.3K