The crucial goal of a targeted microarray in medical practice is to provide clinically useful results for diagnosis, genetic counseling, prognosis, and clinical management of unbalanced cytogenetic abnormalities. 18 Applications edit conventional edit conventional cgh has been used mainly for the identification of chromosomal regions that are recurrently lost or gained in tumors, as well as for the diagnosis and prognosis of cancer. 23 This approach can also be used to study chromosomal aberrations in fetal and neonatal genomes. Furthermore, conventional cgh can be used in detecting chromosomal abnormalities and have been shown to be efficient in diagnosing complex abnormalities associated with human genetic disorders. 15 In cancer research edit cgh data from several studies of the same tumor type show consistent patterns of non-random genetic aberrations. 24 Some of these changes appear to be common to various kinds of malignant tumors, while others are more tumor specific. For example, gains of chromosomal regions lq, 3q and 8q, as well as losses of 8p, 13q, 16q and 17p, are common to a number of tumor types, such as breast, ovarian, prostate, renal and bladder cancer (Figure.
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21 The latest approach is spotting the arrays with short oligonucleotides. The amount of oligos is almost infinite, and thesis the processing is rapid, cost-effective, and easy. Although oligonucleotides do not have the sensitivity to detect single copy changes, averaging of ratios from oligos that map next to each other on the chromosome can compensate for the reduced sensitivity. 22 It is also possible to use arrays which have overlapping probes so that specific breakpoints may be uncovered. Design approaches edit There are two approaches to the design of microarrays for cgh applications: whole genome and targeted. Whole genome arrays are designed to cover the entire human genome. They often include clones that provide an extensive coverage across the genome; and arrays that have contiguous coverage, within the limits of the genome. Whole-genome arrays have been constructed mostly for research applications and have proven their outstanding worth in gene discovery. They are also very valuable in screening the genome for dna gains and losses at an unprecedented resolution. 18 Targeted arrays are designed for a specific region(s) of the genome for the purpose of evaluating that targeted segment. It may be designed to study a specific chromosome or chromosomal segment plan or to identify and evaluate specific dna dosage abnormalities in individuals with suspected microdeletion syndromes or subtelomeric rearrangements.
19 Technological approaches to array cgh edit acgh profile of the imr32 neuroblastoma cell line Array cgh has been implemented using a wide variety of techniques. Therefore, some of the advantages and limitations of array cgh are dependent on the technique chosen. The initial approaches used arrays produced from large insert genomic dna clones, such as bacs. The use of bacs provides sufficient intense signals to detect single-copy changes and to locate aberration boundaries accurately. However, initial dna yields of isolated bac clones are low and dna amplification techniques are necessary. These thesis techniques include ligation -mediated polymerase chain reaction (pcr degenerate primer pcr using one or several sets of primers, and rolling circle amplification. 20 Arrays can also be constructed using cDNA. These arrays currently yield a high spatial resolution, but the number of cDNAs is limited by the genes that are encoded on the chromosomes, and their sensitivity is low due to cross-hybridization. 15 This results in the inability to detect single copy changes on a genome wide scale.
In both techniques, dna from a reference (or control) sample and dna from a test (or patient) sample are differentially labelled with two different fluorophores and used as probes that are cohybridized competitively onto nucleic acid targets. In conventional cgh, the target is estate a reference metaphase spread. In array cgh, these targets can be genomic fragments cloned in a variety of vectors (such as bacs or plasmids cDNAs, or oligonucleotides. 15 is a schematic overview of the array cgh technique. Dna from the sample to be tested is labeled with a red fluorophore ( cyanine 5) and a reference dna sample is labeled with green fluorophore (Cyanine 3). Equal quantities of the two dna samples are mixed and cohybridized to a dna microarray of several thousand evenly spaced cloned dna fragments or oligonucleotides, which have been spotted in triplicate on the array. After hybridization, digital imaging summary systems are used to capture and quantify the relative fluorescence intensities of each of the hybridized fluorophores. 18 The resulting ratio of the fluorescence intensities is proportional to the ratio of the copy numbers of dna sequences in the test and reference genomes. If the intensities of the flurochromes are equal on one probe, this region of the patient's genome is interpreted as having equal quantity of dna in the test and reference samples; if there is an altered Cy3:Cy5 ratio this indicates a loss or a gain.
14 Array cgh compares the patient's genome against a reference genome and identifies differences between the two genomes, and hence locates regions of genomic imbalances in the patient, utilizing the same principles of competitive fluorescence in situ hybridization as traditional cgh. With the introduction of array cgh, the main limitation of conventional cgh, a low resolution, is overcome. In array cgh, the metaphase chromosomes are replaced by cloned dna fragments (100200 kb) of which the exact chromosomal location is known. This allows the detection of aberrations in more detail and, moreover, makes it possible to map the changes directly onto the genomic sequence. 15 Array cgh has proven to be a specific, sensitive, fast and highthroughput technique, with considerable advantages compared to other methods used for the analysis of dna copy number changes making it more amenable to diagnostic applications. Using this method, copy number changes at a level of 510 kilobases of dna sequences can be detected., even high-resolution cgh ( hr-cgh ) arrays are accurate to detect structural variations (SV) at resolution of 200. 17 This method allows one to identify new recurrent chromosome changes such as microdeletions and duplications in human conditions such as cancer and birth defects due to chromosome aberrations. Array-cgh protocol Methodology edit Array cgh is based on the same principle as conventional cgh.
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3 The coverslip is then removed and 5 minute washes are applied, three using 2xssc at room temperature, one at 45 C with.1xssc and one using tnt at room temperature. The reaction is then preincubated for 10 minutes then followed by a 60-minute, 37 C incubation, three more 5 minute washes with tnt then one with 2xssc at room temperature. The slide is then dried using an ethanol series of 70/96/100 before counterstaining with dapi (0.35 μg/ml for chromosome identification, and sealing with a coverslip. 3 Fluorescence visualisation and imaging edit a fluorescence microscope with the appropriate filters for the dapi stain as well as the two fluorophores utilised is required for visualisation, and these filters should also minimise the crosstalk between the fluorophores, such as narrow band pass filters. The microscope must provide uniform illumination without chromatic variation, be appropriately aligned and have a plan type of objective which is apochromatic and give a magnification of x63 or x100. 3 The image should be recorded using a camera with spatial resolution at least.1 µm at the specimen level and give an image of at least 600x600 pixels. The camera must also be able to integrate the image for at least 5 to 10 seconds, with a minimum photometric resolution of 8 bit.
3 Dedicated cgh software is commercially available for the image processing step, and is required to subtract background noise, remove and segment materials not of chromosomal origin, normalize the fluorescence ratio, carry out interactive karyotyping and chromosome scaling to standard length. A relative copy number karyotype which presents chromosomal areas of deletions or amplifications is generated by averaging the ratios of a number of high quality metaphases and plotting them along an ideogram, a diagram identifying chromosomes based on banding patterns. Interpretation of the ratio profiles is conducted either using fixed or statistical thresholds ( confidence intervals ). When using confidence intervals, gains or losses are identified when 95 of the fluorescence ratio does not contain.0. 3 Extra notes edit Extreme care must be taken to avoid contamination of any step involving dna, especially with the test dna as contamination of the sample with normal dna will skew results closer.0, thus abnormalities may go undetected. Fish, pcr and flow book cytometry experiments may be employed to confirm results. 5 13 Array comparative genomic hybridization edit Array comparative genomic hybridization (also microarray-based comparative genomic hybridization, matrix cgh, array cgh, acgh) is a molecular cytogenetic technique for the detection of chromosomal copy number changes on a genome wide and high-resolution scale.
This is followed by separation by agitation and centrifugation, after which the aqueous layer is removed and further treated using ether and finally ethanol precipitation is used to concentrate the dna. 3 may be completed using dna isolation kits available commercially which are based on affinity columns. 3 Preferentially, dna should be extracted from fresh or frozen tissue as this will be of the highest quality, though it is now possible to use archival material which is formalin fixed or paraffin wax embedded, provided the appropriate procedures are followed. 0.5-1 µg of dna is sufficient for the cgh experiment, though if the desired amount is not obtained dop-pcr may be applied to amplify the dna, however it in this case it is important to apply dop-pcr to both the test and reference dna samples. 3 dna labelling edit nick translation is used to label the dna and involves cutting dna and substituting nucleotides labelled with fluorophores (direct labelling) or biotin or oxigenin to have fluophore conjugated antibodies added later (indirect labelling).
It is then important to check fragment lengths of both test and reference dna by gel electrophoresis, as they should be within the range of 500kb-1500kb for optimum hybridization. 3 Blocking edit Unlabelled Life technologies Corporation's Cot-1 dna (placental dna enriched with repetitive sequences of length 50bp-100bp)is added to block normal repetitive dna sequences, particularly at centromeres and telomeres, as these sequences, if detected, may reduce the fluorescence ratio and cause gains or losses. 3 Hybridization edit 812µl of each of labelled test and labelled reference dna are mixed and 40 µg Cot-1 dna is added, then precipitated and subsequently dissolved in 6µl of hybridization mix, which contains 50 formamide to decrease dna melting temperature and 10 dextran sulphate. 3 Denaturation of the slide and probes are carried out separately. The slide is submerged in 70 formamide/2xssc for 510 minutes at 72 C, while the probes are denatured by immersion in a water bath of 80 C for 10 minutes and are immediately added to the metaphase slide preparation. This reaction is then covered with a coverslip and left for two to four days in a humid chamber at.
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Colchicine is added to arrest the cells in mitosis, the cells are then thesis harvested and treated with hypotonic potassium chloride and fixed in 3:1 methanol / acetic acid. 3 One drop of the cell suspension should then be dropped onto an ethanol cleaned slide from a distance of about 30 cm, optimally this reviews should be carried out at room temperature at humidity levels of 6070. Slides should be evaluated by visualisation using a phase contrast microscope, minimal cytoplasm should be observed and chromosomes should not be overlapping and be 400550 bands long with no separated chromatids and finally should appear dark rather than shiny. Slides then need to be air dried overnight at room temperature, and any further storage should be in groups of four at 20 C with either silica beads or nitrogen present to maintain dryness. Different donors should be tested as hybridization may be variable. Commercially available slides may be used, but should always be tested first. 3 Isolation of dna from test tissue and reference tissue edit Standard phenol extraction is used to obtain dna from test or reference (karyotypically normal individual) tissue, which involves the combination of Tris - ethylenediaminetetraacetic acid and phenol with aqueous dna in equal amounts.
In 1997 using tumor cells 9 and Pinkel. In 1998 by use of breast cancer cells. 10 This was made possible by the human Genome Project which generated a nature library of cloned dna fragments with known locations throughout the human genome, with these fragments being used as probes on the dna microarray. 11 Now probes of various origins such as cdna, genomic pcr products and bacterial artificial chromosomes (BACs) can be used on dna microarrays which may contain up to 2 million probes. 11 Array cgh is automated, allows greater resolution (down to 100 kb) than traditional cgh as the probes are far smaller than metaphase preparations, requires smaller amounts of dna, can be targeted to specific chromosomal regions if required and is ordered and therefore faster. 11 12 Figure. Schematic of cgh protocol Basic methods edit metaphase slide preparation edit The dna on the slide is a reference sample, and is thus obtained from a karyotypically normal man or woman, though it is preferential to use female dna as they possess two x chromosomes. Phytohaemagglutinin stimulated peripheral blood lymphocytes are used. 1mL of heparinised blood is added to 10ml of culture medium and incubated for 72 hours at 37 C in an atmosphere of 5 CO2.
amplification, many of which were novel discoveries. 1 soon after in 1993, du manoir. Reported virtually the same methodology. The authors painted a series of individual human chromosomes from a dna library with two different fluorophores in different proportions to test the technique, and also applied cgh to genomic dna from patients affected with either Downs syndrome or T-cell prolymphocytic leukemia as well. It was concluded that the fluorescence ratios obtained were accurate and that differences between genomic dna from different cell types were detectable, and therefore that cgh was a highly useful cytogenetic analysis tool. 7 Initially, the widespread use of cgh technology was difficult, as protocols were not uniform and therefore inconsistencies arose, especially due to uncertainties in the interpretation of data. 3 However, in 1994 a review was published which described an easily understood protocol in detail 8 and the image analysis software was made available commercially, which allowed cgh to be utilised all around the world. 3 As new techniques such as microdissection and degenerate oligonucleotide primed polymerase chain reaction (dop-pcr) became available for the generation of dna products, it was possible to apply the concept of cgh to smaller chromosomal abnormalities, and thus the resolution of cgh was improved. 3 The implementation of array cgh, whereby dna microarrays are used instead of the traditional metaphase chromosome preparation, was pioneered by solinas-Tolodo.
This is because balanced chromosomal abnormalities such as reciprocal translocations, inversions or ring chromosomes do not affect copy number, which is what is detected by cgh technologies. Cgh does, however, allow for the exploration of all 46 human chromosomes in single test and the discovery of deletions and duplications, even on the microscopic scale which may lead to the identification of candidate genes to be further explored by other cytological techniques. 2 4, database through the use of, dNA microarrays in conjunction with cgh techniques, the more specific form of array cgh (acgh) has been developed, allowing for a locus-by-locus measure of cnv with increased resolution as low as 100 kilobases. 5 6 This improved technique allows for the aetiology of known and unknown conditions to be discovered. Contents History edit The motivation underlying the development of cgh stemmed from the fact that the available forms of cytogenetic analysis at the time ( giemsa banding and fish ) were limited in their potential resolution by the microscopes necessary for interpretation of the results. Furthermore, giemsa banding interpretation has the potential to be ambiguous and therefore has lowered reliability, and both techniques require high labour inputs which limits the loci which may be examined. 5 The first report of cgh analysis was by kallioniemi and colleagues in 1992 at the University of California, san Francisco, who utilised cgh in the analysis of solid tumors.
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Comparative genomic hybridization is paper a molecular cytogenetic method for analysing copy number variations (CNVs) relative to ploidy level in the dna of a test sample compared to a reference sample, without the need for culturing cells. The aim of this technique is to quickly and efficiently compare two genomic dna samples arising from two sources, which are most often closely related, because it is suspected that they contain differences in terms of either gains or losses of either whole chromosomes. This technique was originally developed for the evaluation of the differences between the chromosomal complements of solid tumor and normal tissue, 1 and has an improved resolution of 510 megabases compared to the more traditional cytogenetic analysis techniques of giemsa banding and fluorescence in situ. 2 3, this is achieved through the use of competitive fluorescence in situ hybridization. In short, this involves the isolation of dna from the two sources to be compared, most commonly a test and reference source, independent labelling of each dna sample with fluorophores (fluorescent molecules) of different colours (usually red and green denaturation of the dna so that. Using a fluorescence microscope and computer software, the differentially coloured fluorescent signals are then compared along the length of each chromosome for identification of chromosomal differences between the two sources. A higher intensity of the test sample colour in a specific region of a chromosome indicates the gain of material of that region in the corresponding source sample, while a higher intensity of the reference sample colour indicates the loss of material in the test. A neutral colour (yellow when the fluorophore labels are red and green) indicates no difference between the two samples in that location. 2 3, cgh is only able to detect unbalanced chromosomal abnormalities.