Skip to main content
Weiter zur Homepage der Europäischen Kommission (öffnet in neuem Fenster)
Deutsch de
CORDIS - Forschungsergebnisse der EU
CORDIS
Inhalt archiviert am 2024-04-16

Improvement of high resolution in situ hybridization mapping of DNA sequences and new approaches to detect specific chromosomal aberrations by multiprobe-multicolor in situ hybridization

Ziel


New diagnostic tools have been developed for the detection of tumor associated chromosomal aberrations as a spin off from improved physical maps in the corresponding regions of the human genome. Fluorescence in situ hybridization (FISH) protocols are especially designed to meet clinical requirements. Thus, sets of deoxyribonucleic acid (DNA) probes have been generated that allow the routine diagnosis of the most common cytogenetic abnormalities. Furthermore, multicolour FISH protocols have been established for the simultaneous diagnosis of the most important chromosomal changes in certain types of leukemias.

The practicability and resolution of various new techniques have been assessed for high resolution mapping by FISH and their application for the generation of a physical map of 17q11. Specific chromosomal aberrations associated with leukamias have been characterized and protocols have been optimized to detect these aberrations by FISH using genomic DNA probes; these chromosomal aberrations include translocations and deletions involving 11q23, translocation t(9;22)(q34;q11) and trisomy 12 in lymphoid leukemias, as well as translocations t(9;22)(q34;q11), t(8;21) and t(3;21) in myeloid leukemias. New recurrent aberrations are being detected in chronic lymphocytic leukemias and DNA probe sets are being optimized for their clinical diagnosis; these include deletion of the RB-1 gene and the TP53 gene. An assessment of the practicability of multicolour probe sets in haematological diseases has been carried out and further development of the new approach of comparative genomic hybridization (CGH) has taken place.
In situ hybridization has been a major means for physical mapping of nucleic acid probes. By the combination of newly developed protocols for nonisotopic in situ hybridization and digital imaging microscopy, it has been demonstrated that DNA probes can be mapped along prometaphase chromosomes with speed and precision (Lichter et al., Science 247, 64-69, 1990), achieving a resolution in the 1 Mbp range. In order to improve the mapping resolution, highly elongated chromosomes prepared by various techniques (eg by premature chromosome condensation (PCC) or by certain drug treatments) will be used. This approach will be tested using multiple cosmid probes previously mapped to chromosomes 11 and 17.

The concept of mapping probes relative to each other by comparing many average distances between probe signals in interphase nuclei has been reported in the literature. However little is known about differential and, for example, cell type specific condensation of chromatin in the investigated range of 10 to 1000 kb. In order to test interphase mapping as a general approach, the above mentioned cosmid probes will also be mapped using interphase nuclei preparations. These data will be compared to the mapping by using various preparation techniques.

Sets of DNA probes ordered along chromosomes will be of great potential in detecting chromosomal aberrations. In particular, probes specifically delineating a genomic segment by in situ hybridization with high efficiency, will allow the development of new diagnostic tools to detect numerical and structural aberrations. In order to develop such new tools three regions of the human genome will be analyzed: chromosomal aberrations involving 11q and 13q using chromosomes from chronic lymphoproliferative and acute leukaemia patients, and structural aberrations in 17p mainly using material from patients with Miller-Dieker syndrome, Smith-Magenis syndrome or Charcot-Marie-Tooth disease.

In order to detect translocations and (even submicroscopic) deletions performing a single simultaneous hybridization-multicolour detection experiment sets of differentially labelled probes will established. For further characterization additional probe sets covering subregions of the investigated area will be designed. These approaches will be carried out not only on metaphase chromosomes but also in interphase nuclei to develop protocols for the detection of translocations and small deletions in tissues which are not accessible by conventional cytogenetic techniques.

The probe sets will be designed and tested using cytogenetically characterized chromosomes with structural alterations of 11q followed by a blind study with material from the same kind of leukaemia patients. Similarly, single probes and combinations of probes which unambiguously detect alterations, in particular microdeletions, in 17p will be devised using patient cell material.

Wissenschaftliches Gebiet (EuroSciVoc)

CORDIS klassifiziert Projekte mit EuroSciVoc, einer mehrsprachigen Taxonomie der Wissenschaftsbereiche, durch einen halbautomatischen Prozess, der auf Verfahren der Verarbeitung natürlicher Sprache beruht. Siehe: Das European Science Vocabulary.

Sie müssen sich anmelden oder registrieren, um diese Funktion zu nutzen

Programm/Programme

Mehrjährige Finanzierungsprogramme, in denen die Prioritäten der EU für Forschung und Innovation festgelegt sind.

Thema/Themen

Aufforderungen zur Einreichung von Vorschlägen sind nach Themen gegliedert. Ein Thema definiert einen bestimmten Bereich oder ein Gebiet, zu dem Vorschläge eingereicht werden können. Die Beschreibung eines Themas umfasst seinen spezifischen Umfang und die erwarteten Auswirkungen des finanzierten Projekts.

Daten nicht verfügbar

Aufforderung zur Vorschlagseinreichung

Verfahren zur Aufforderung zur Einreichung von Projektvorschlägen mit dem Ziel, eine EU-Finanzierung zu erhalten.

Daten nicht verfügbar

Finanzierungsplan

Finanzierungsregelung (oder „Art der Maßnahme“) innerhalb eines Programms mit gemeinsamen Merkmalen. Sieht folgendes vor: den Umfang der finanzierten Maßnahmen, den Erstattungssatz, spezifische Bewertungskriterien für die Finanzierung und die Verwendung vereinfachter Kostenformen wie Pauschalbeträge.

CSC - Cost-sharing contracts

Koordinator

Stiftung Deutsches Krebsforschungszentrum
EU-Beitrag
Keine Daten
Adresse
Im Neuenheimer Feld 506
69120 Heidelberg
Deutschland

Auf der Karte ansehen

Gesamtkosten

Die Gesamtkosten, die dieser Organisation durch die Beteiligung am Projekt entstanden sind, einschließlich der direkten und indirekten Kosten. Dieser Betrag ist Teil des Gesamtbudgets des Projekts.

Keine Daten

Beteiligte (4)

Mein Booklet 0 0