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You are here : Home / Genitic / FISH
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FISH : A Cytogenetic Technique to detect and localize presence or absence of DNA

FISH (fluorescent in SITU hybridization)

FISH (Fluorescent in situ hybridization) is a cytogenetic technique that can be used to detect and localize the presence or absence of specific DNA sequences on chromosomes. It uses fluorescent probes that bind to only those parts of the chromosome with which they show a high degree of sequence similarity

"Fluorescent" means emitting light that comes from a reaction within the emitter. "In situ" refers to the fact that this techniques is done with the chromosomes, cells or tissue in place (in situ) on a microscope slide.
FISH (fluorescent in SITU hybridization)

Multicolor fluorescence in situ hybridization (FISH), in its simplest form, can be used to identify as many labeled features as there are different fluorophores used in the hybridization. By using not only single colors, but also combinations of colors, many more labeled features can be simultaneously detected in individual cells using digital imaging microscopy.

DNA is a double stranded molecule, and when it is chemically denatured and separated into two strands, it quickly reanneals into a double stranded conformation. Thus, when a single stranded probe is incubated with a single-stranded (denatured) metaphase chromosome (or interphase), the probe will bind to complementary DNA sequences to reform the double stranded molecule. Overall, the most critical step when using FISH is the choice of adequate probes. A DNA probe is defined according to its target or complementary DNA in metaphase and interphase cells: (1) repetitive sequence probe, (2) whole chromosome (painting), (3) locus-specific probes.

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Repetitive sequence probe are generated from repetitive sequences found in the middle of each chromosome. Researchers use these probes to determine whether an individual has the correct number of chromosomes. These probes can also be used in combination with "locus specific probes" to determine whether an individual is missing genetic material from a particular chromosome.
FISH (fluorescent in SITU hybridization)

Whole chromosome probes are actually collections of smaller probes, each of which binds to a different sequence along the length of a given chromosome. Using multiple probes labeled with a mixture of different fluorescent dyes, scientists are able to label each chromosome in its own unique color. The resulting full-color map of the chromosome is known as a spectral karyotype. Whole chromosome probes are particularly useful for examining chromosomal abnormalities, for example, when a piece of one chromosome is attached to the end of another chromosome.

Locus-specific probes are bind to a particular region of a chromosome. This type of probe is useful when scientists have isolated a small portion of a gene and want to determine on which chromosome the gene is located.

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