Metaphase Chromosome Spreads
Metaphase Chromosome Spreads - Related Videos
10:42
Chromosomal Spread Preparation of Human Embryonic Stem Cells for Karyotyping
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Cited by 33 •
2009
Karyotyping is a simple and useful technique widely used for detecting genetic alterations. Here we describe a step by step protocol for chromosome spread preparation of human embryonic stem cells for monitoring the chromosomal status of these cells maintained in culture.
12:06
Surface Spreading and Immunostaining of Yeast Chromosomes
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Cited by 36 •
2015
A method for surface-spreading chromosomes from budding yeast is presented. This method is derived from a method previously described by Loidl and Klein. In addition, we demonstrate a procedure for immunostaining of spread chromosomes.
06:38
Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes
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Cited by 27 •
2017
Meiosis is the developmental process by which gametes are formed through a single round of DNA replication and two successive rounds of chromosome segregation. Mammalian meiosis can be examined by utilizing a technique to prepare meiotic chromosome spreads. Here, we demonstrate a method of preparing surface-spread nuclei from mouse spermatocytes.
10:39
Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Cited by 21 •
2018
Oogenesis in mammals is known to be error-prone, particularly due to chromosome missegregation. This manuscript describes chromatin spread preparation methods for mouse prophase, metaphase I and II-staged oocytes. These fundamental techniques allow for the study of chromatin-bound proteins and chromosome morphology throughout mammalian oogenesis.
06:25
Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
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Cited by 15 •
2012
A novel fluorescence in situ hybridization (FISH) method that simultaneously examines both numerical and structural chromosome alterations, particularly the specific chromosomal translocations associated with leukemia and lymphoma, of all 24 human chromosomes on a single device in one hybridization, is described.
FAQs
Metaphase is selected because chromosomes are maximally condensed at this stage of cell division. Their compact form makes individual chromosomes suitable for microscopic examination and comparison by number, relative size, and visible structure. This degree of condensation is therefore central to producing chromosome preparations that support cytogenetic analysis and karyotyping.
The preparation uses these treatments for distinct physical purposes. A hypotonic solution swells the cells, fixation follows to stabilize the prepared material, and dropping it onto a slide promotes chromosome dispersion. The resulting arrangement can then be stained and examined microscopically, making chromosome-level features easier to assess across the spread.
The arranged chromosomes can be evaluated as a complete set, allowing investigators to assess chromosome number, relative size, and visible structural features. These observations support karyotyping, a cytogenetic analysis of the chromosome complement, and may reveal aneuploidy, large structural abnormalities, or sex-chromosome composition. The spread therefore connects microscopic observations with chromosome-level interpretation.
Cells are first arrested in metaphase, when their chromosomes are highly condensed. The cells then undergo hypotonic treatment to promote swelling, followed by fixation. Fixed material is dropped onto microscope slides so the chromosomes disperse, and the slides are stained for microscopic examination. Each stage contributes to obtaining an interpretable chromosome arrangement.
Microscopic examination can provide information about chromosome number, size, and visible structure. In particular, the preparations can reveal aneuploidy, which refers to an abnormal chromosome number, as well as large structural abnormalities and the composition of the sex chromosomes. These findings make spreads useful for organizing and interpreting the chromosome complement.
These preparations are used when researchers need chromosome-level evidence in settings such as karyotyping, prenatal assessment, cancer studies, and investigations of genome stability. Their value comes from making condensed chromosomes available for direct microscopic analysis. The same preparation therefore supports both clinical investigations and broader biological studies of chromosome changes.