In a DNA microarray, thousands of DNA fragments are spotted onto a glass slide. Usually, it is a fragment of each gene (or cDNA) that is spotted onto these glass slides. Each of these fragments will be used for a hybridization reaction with mRNA that is collected from tissue samples.
To determine the expression of these tissues, mRNA is collected and turned into cDNA. Fluorescent labeled nucleotides are added to the sample so that they will be detectable under a colored laser. Two samples are usually compared to each other. The labeled cDNAs are allowed to hybridize with the genomic fragments that were spotted onto the glass slides. The cDNAs from each sample will be able to simultaneously hybridize with the target sequences.
A cDNA microarray is a hybrid of a DNA microarray, which is a collection of a number of minute DNA dots. These are mostly used in the field of genetic testing.
mRNA is extracted from cells for DNA microarray. the mRNA is then converted in the lab to cDNA this cDNA is allowed to interact with the probes on the microarray chip
DNA microarray analysis is a technique used to match up two strands of DNA. It is used in paternity tests and in criminal investigations in which a perpetrator's DNA was found at the crime scene.
Step 1: Isolate the mRNA. Step 2: Make cDNA by reverse transcription using fluorescent labeled nucleotides. Step 3: Apply the cDNA mixture to a microarray with a different gene in each spot. Step 4: Rinse off excess DNA; scan for fluorescence.
I am a grad student taking a workshop in DNA microarray. I just started - so I am by no means an expert, but here is what I know so far. Pros Microarray technology is amazing in that it can be used to figure out which genes in an ENTIRE genome are upregulated or downregulated between two treatments. For example, if one treatment consisted of absolutely normal non cancerous prostate tissue, and the other treatment consisted of cancerous prostate tissue, you would be able to tell which genes are differentially expressed - an extremely powerful research tool. Cons The results cannot be taken as absolute fact, because they are partially a result of the manipulation of statistics. They must be corroborated afterwards with in vitro or in vivo experiments. It is REALLY expensive. Hope this helps!
A cDNA microarray is a hybrid of a DNA microarray, which is a collection of a number of minute DNA dots. These are mostly used in the field of genetic testing.
mRNA is extracted from cells for DNA microarray. the mRNA is then converted in the lab to cDNA this cDNA is allowed to interact with the probes on the microarray chip
DNA microarray analysis is a technique used to match up two strands of DNA. It is used in paternity tests and in criminal investigations in which a perpetrator's DNA was found at the crime scene.
Otherwise known as "microarray chips," DNA microarray are used to determined the genetic makeup of a given tissue sample. By shining various bands of light on these chips, the gene(s) in the tissue are expressed in the form of a particular color.
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DNA Microarray
Step 1: Isolate the mRNA. Step 2: Make cDNA by reverse transcription using fluorescent labeled nucleotides. Step 3: Apply the cDNA mixture to a microarray with a different gene in each spot. Step 4: Rinse off excess DNA; scan for fluorescence.
DNA chip or also called as DNA microarray is a collection of microscopic DNA spot attached to a firm surface. This is used by scientist to measure the expression level of the large amount of genes or to genotype numerous regions of a genome.
A microarray is a multiplex lab-on-a-chip. It is a 2D array on a solid substrate (usually a glass slide or silicon thin-film cell) that assays large amounts of biological material using high-throughput screening methods
Microarray data is usually applied for the comparison of gene expression profiles under different conditions. But we have to make sure what we are comparing is really comparable. So, to bring the data under common frame normalization is done. In technical terms, normalization of microarray data removes both random and systematic biases. [Source: Guide To Analysis of DNA Microarray Data]
it works by chips
DO STEKEL has written: 'MICROARRAY BIOINFORMATICS'