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Chromosome preparation from cultured cells

Chromosome (cytogenetic) analysis is widely used for the detection of chromosome instability. When followed by G-banding and molecular techniques such as fluorescence in situ hybridization (FISH), this assay has the powerful ability to analyze individual cells for aberrations that involve gains or l...

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Published in:Journal of visualized experiments 2014-01 (83), p.e50203-e50203
Main Authors: Howe, Bradley, Umrigar, Ayesha, Tsien, Fern
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description Chromosome (cytogenetic) analysis is widely used for the detection of chromosome instability. When followed by G-banding and molecular techniques such as fluorescence in situ hybridization (FISH), this assay has the powerful ability to analyze individual cells for aberrations that involve gains or losses of portions of the genome and rearrangements involving one or more chromosomes. In humans, chromosome abnormalities occur in approximately 1 per 160 live births(1,2), 60-80% of all miscarriages(3,4), 10% of stillbirths(2,5), 13% of individuals with congenital heart disease(6), 3-6% of infertility cases(2), and in many patients with developmental delay and birth defects(7). Cytogenetic analysis of malignancy is routinely used by researchers and clinicians, as observations of clonal chromosomal abnormalities have been shown to have both diagnostic and prognostic significance(8,9). Chromosome isolation is invaluable for gene therapy and stem cell research of organisms including nonhuman primates and rodents(10-13). Chromosomes can be isolated from cells of live tissues, including blood lymphocytes, skin fibroblasts, amniocytes, placenta, bone marrow, and tumor specimens. Chromosomes are analyzed at the metaphase stage of mitosis, when they are most condensed and therefore more clearly visible. The first step of the chromosome isolation technique involves the disruption of the spindle fibers by incubation with Colcemid, to prevent the cells from proceeding to the subsequent anaphase stage. The cells are then treated with a hypotonic solution and preserved in their swollen state with Carnoy's fixative. The cells are then dropped on to slides and can then be utilized for a variety of procedures. G-banding involves trypsin treatment followed by staining with Giemsa to create characteristic light and dark bands. The same procedure to isolate chromosomes can be used for the preparation of cells for procedures such as fluorescence in situ hybridization (FISH), comparative genomic hybridization (CGH), and spectral karyotyping (SKY)(14,15).
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subjects Basic Protocol
Cells, Cultured
Chromosome Banding - methods
Chromosomes, Human - chemistry
Chromosomes, Human - genetics
Cytogenetic Analysis - methods
Humans
Lymphocytes - cytology
Lymphocytes - ultrastructure
Metaphase - genetics
title Chromosome preparation from cultured cells
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