Chromosomics: संख्यात्मक और स्ट्रक्चरल बदलाव की जांच सभी 24 मानव गुणसूत्रों में इसके साथ ही एक उपन्यास OctoChrome मछली परख का उपयोग
Summary
एक उपन्यास प्रतिदीप्ति<em> बगल में</em> संकरण (मछली) विधि है कि एक साथ गुणसूत्र दोनों संख्यात्मक और संरचनात्मक परिवर्तन, विशेष रूप से विशिष्ट गुणसूत्र ल्यूकेमिया और लिम्फोमा के साथ जुड़े एक संकरण में एक डिवाइस पर सभी 24 मानव गुणसूत्रों की translocations, परख होती है, वर्णित है.
Abstract
Fluorescence in situ hybridization (FISH) is a technique that allows specific DNA sequences to be detected on metaphase or interphase chromosomes in cell nuclei1. The technique uses DNA probes with unique sequences that hybridize to whole chromosomes or specific chromosomal regions, and serves as a powerful adjunct to classic cytogenetics. For instance, many earlier studies reported the frequent detection of increased chromosome aberrations in leukemia patients related with benzene exposure, benzene-poisoning patients, and healthy workers exposed to benzene, using classic cytogenetic analysis2. Using FISH, leukemia-specific chromosomal alterations have been observed to be elevated in apparently healthy workers exposed to benzene3-6, indicating the critical roles of cytogentic changes in benzene-induced leukemogenesis.
Generally, a single FISH assay examines only one or a few whole chromosomes or specific loci per slide, so multiple hybridizations need to be conducted on multiple slides to cover all of the human chromosomes. Spectral karyotyping (SKY) allows visualization of the whole genome simultaneously, but the requirement for special software and equipment limits its application7. Here, we describe a novel FISH assay, OctoChrome-FISH, which can be applied for Chromosomics, which we define here as the simultaneous analysis of all 24 human chromosomes on one slide in human studies, such as chromosome-wide aneuploidy study (CWAS)8. The basis of the method, marketed by Cytocell as the Chromoprobe Multiprobe System, is an OctoChrome device that is divided into 8 squares, each of which carries three different whole chromosome painting probes (Figure 1). Each of the three probes is directly labeled with a different colored fluorophore, green (FITC), red (Texas Red), and blue (Coumarin). The arrangement of chromosome combinations on the OctoChrome device has been designed to facilitate the identification of the non-random structural chromosome alterations (translocations) found in the most common leukemias and lymphomas, for instance t(9;22), t(15;17), t(8;21), t(14;18)9. Moreover, numerical changes (aneuploidy) in chromosomes can be detected concurrently. The corresponding template slide is also divided into 8 squares onto which metaphase spreads are bound (Figure 2), and is positioned over the OctoChrome device. The probes and target DNA are denatured at high-temperature and hybridized in a humid chamber, and then all 24 human chromosomes can be visualized simultaneously.
OctoChrome FISH is a promising technique for the clinical diagnosis of leukemia and lymphoma and for detection of aneuploidies in all chromosomes. We have applied this new Chromosomic approach in a CWAS study of benzene-exposed Chinese workers8,10.
Protocol
Discussion
यह उपन्यास परख OctoChrome मछली के साथ ही एक स्लाइड पर एक संकरण में सभी 24 मानव गुणसूत्रों की जांच करने के लिए अनुमति देता है. 8 वर्गों पर गुणसूत्र संयोजन की व्यवस्था के लिए सबसे आम ल्यूकेमिया और lymphomas में गैर यादृच?…
Declarações
The authors have nothing to disclose.
Acknowledgements
लेखकों गंभीर पढ़ने और पांडुलिपि संपादन के लिए डॉ. Cliona एम. McHale धन्यवाद देना चाहूंगा. इस काम पर्यावरणीय स्वास्थ्य विज्ञान, राष्ट्रीय स्वास्थ्य अनुदान R01ES017452 के एल जांग संस्थान के राष्ट्रीय संस्थान द्वारा वित्त पोषित किया गया था.
Materials
| Name of the reagent | Company | Catalogue number | Comments (optional) |
| OctoChrome Kit | Cytocell Ltd, Cambridge, UK | PMP 803 | |
| phytohaemagglutinin (PHA) | Invitrogen Corporation | 10576-015 | |
| Colcemid | Invitrogen Corporation | 15212-012 | |
| Carnoy’s fixative | Methanol : glacial acetic acid = 3: 1 | ||
| Fluorescence microscope | Equipped with filters to view DAPI, Texas Red, FITC, and Coumarin spectra individually and a DAPI/FITC/Texas Red triple filter to view different colors simultaneously | ||
| Metafer software | MetaSystems, Altlussheim, Germany | Facilitate to locate all metaphases and to re-evaluate the abnormalities |
Referências
- Levsky, J. M., Singer, R. H. Fluorescence in situ hybridization: past, present and future. J. Cell. Sci. 116, 2833-2838 (2003).
- Zhang, L., Eastmond, D. A., Smith, M. T. The nature of chromosomal aberrations detected in humans exposed to benzene. Crit. Rev. Toxicol. 32, 1-42 (2002).
- Zhang, L. Aberrations in chromosomes associated with lymphoma and therapy-related leukemia in benzene-exposed workers. Environ. Mol. Mutagen. 48, 467-474 (2007).
- Zhang, L. Benzene increases aneuploidy in the lymphocytes of exposed workers: a comparison of data obtained by fluorescence in situ hybridization in interphase and metaphase. Environ. Mol. Mutagen. 34, 260-268 (1999).
- Zhang, L. Increased aneusomy and long arm deletion of chromosomes 5 and 7 in the lymphocytes of Chinese workers exposed to benzene. Carcinogenesis. 19, 1955-1961 (1998).
- Smith, M. T. Increased translocations and aneusomy in chromosomes 8 and 21 among workers exposed to benzene. Cancer. Res. 58, 2176-2181 (1998).
- Bayani, J., Squire, J. A. Advances in the detection of chromosomal aberrations using spectral karyotyping. Clin. Genet. 59, 65-73 (2001).
- Zhang, L. Chromosome-wide aneuploidy study (CWAS) in workers exposed to an established leukemogen, benzene. Carcinogenesis. 32, 605-612 (2011).
- Rowley, J. D. The role of chromosome translocations in leukemogenesis. Semin. Hematol. 36, 59-72 (1999).
- Zhang, L. Use of OctoChrome fluorescence in situ hybridization to detect specific aneuploidy among all 24 chromosomes in benzene-exposed workers. Chem. Biol. Interact. , 153-154 (2005).
- Barch, M. J., Lawce, H. J., Arsham, M. S., Barch, M. J. . In The ACT cytogenetics laboratory. , 17-30 (1991).
- Zhang, L., Yang, W., Hubbard, A. E., Smith, M. T. Nonrandom aneuploidy of chromosomes 1, 5, 6, 7, 8, 9, 11, 12, and 21 induced by the benzene metabolites hydroquinone and benzenetriol. Environ. Mol. Mutagen. 45, 388-396 (2005).
- Smith, M. T. Hydroquinone, a benzene metabolite, increases the level of aneusomy of chromosomes 7 and 8 in human CD34-positive blood progenitor cells. Carcinogenesis. 21, 1485-1490 (2000).
- Smith, M. T. Advances in understanding benzene health effects and susceptibility. Annu. Rev. Public. Health. 31, 133-148 (2010).
