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SPECTRAL KARYOTYPING [2 records]

Record 1 1999-10-22

English

Subject field(s)
  • Genetics
OBS

The new karyotyping methods introduced by Schrock et al use fluorescent dyes that bind to specific regions of chromosomes. By using a series of specific probes each with varying amounts of the dyes, different pairs of chromosomes have unique spectral characteristics. A unique feature of the technology is the use of an interferometer similar to ones used by astronomers for measuring light spectra emitted by stars. Slight variations in color, undetectable by the human eye, are detected by a computer program that then reassigns an easy-to-distinguish color to each pair of chromosomes. The result is a digital image rather than film, in full color. Pairing of the chromosomes is simpler because homologous pairs are the same color, and aberrations and cross-overs are more easily recognizable. In additional, the spectral karyotype has been used to detect translocations not recognizable by traditional banding analysis.

French

Domaine(s)
  • Génétique
CONT

Par isolement de chacune des paires chromosomiques, en cytométrie de flux ou à l'aide de la microdissection, la FISH est désormais capable de réaliser de vieux rêves que les cytogénéticiens jugèrent longtemps puérils et utopiques : le coloriage du caryotype en un ravissant nuancier (le caryotype spectral) où chaque paire devient identifiable et à partir duquel toute reconnaissance (de remaniements, chromosomes marqueurs, fragments surnuméraires...) devient possible.

Spanish

Save record 1

Record 2 1997-07-16

English

Subject field(s)
  • Genetics
OBS

The new karyotyping methods introduced by Schrock et al use fluorescent dyes that bind to specific regions of chromosomes. By using a series of specific probes each with varying amounts of the dyes, different pairs of chromosomes have unique spectral characteristics. A unique feature of the technology is the use of an interferometer similar to ones used by astronomers for measuring light spectra emitted by stars. Slight variations in color, undetectable by the human eye, are detected by a computer program that then reassigns an easy-to-distinguish color to each pair of chromosomes. The result is a digital image rather than film, in full color. Pairing of the chromosomes is simpler because homologous pairs are the same color, and aberrations and cross-overs are more easily recognizable. In additional, the spectral karyotype has been used to detect translocations not recognizable by traditional banding analysis.

French

Domaine(s)
  • Génétique
OBS

Nouvelle technique de cytogénétique moléculaire.

DEF

Méthode fondée sur la discrimination de chaque fluorochrome via l'établissement d'un spectre d'émission de fluorescence (environ 50 à 100 valeurs utiles) et chaque point de l'image. Cette approche la différencie de la microscopie en épifluorescence classique où la détermination des fluorochromes est effectuée par le biais d'une seule mesure [...]

CONT

Le caryotype spectral pourrait être rapidement inclus de façon complémentaire dans les protocoles cytogénétiques hospitaliers d'étude des cancers.

CONT

Le caryotype spectral, décrit par l'équipe de T Ried au National Institute Of Health (Bethesda) en juin 1996, est une démonstration extrêmement convaincante que chaque chromosome est identifiable spécifiquement et simultanément par sa coloration en peinture chromosomique. La puissance de cette méthode permet «in fine» de caractériser des remaniements chromosomiques de structure complexe, même en l'absence de bandes.

Spanish

Save record 2

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