What are some potential problems with microarray analysis?

What are some potential problems with microarray analysis?

The most significant disadvantages of microarrays include the high cost of a single experiment, the large number of probe designs based on sequences of low-specificity, as well as the lack of control over the pool of analyzed transcripts since most of the commonly used microarray platforms utilize only one set of …

What are the major steps in preparing a microarray experiment?

There are three major steps involved in a typical experiment involving a microarray: preparation of microarrays; preparation of fluorescently labeled cDNA probes and hybridization; and finally scanning, image and data analysis.

How does mRNA microarray work?

The principle behind microarrays is that complementary sequences will bind to each other. The unknown DNA molecules are cut into fragments by restriction endonucleases; fluorescent markers are attached to these DNA fragments. Then the target DNA fragments along with complementary sequences bind to the DNA probes.

What happens when RNA sample is washed over microarray?

To study gene expression, mRNA is isolated from the cells of interest and converted into labeled cDNA. This cDNA is then washed over a microarray carrying features representing all the genes that could possibly be expressed in those cells. If hybridization occurs to a certain feature, it means the gene is expressed.

What are the advantages of microarray?

The microarrays have become important because they are easier to use, do not require large-scale DNA sequencing and allow the parallel quantification of thousands of genes from multiple samples.

What are the uses of DNA microarray?

The DNA microarray is a tool used to determine whether the DNA from a particular individual contains a mutation in genes like BRCA1 and BRCA2. The chip consists of a small glass plate encased in plastic. Some companies manufacture microarrays using methods similar to those used to make computer microchips.

What are the steps involved in microarray?

A basic protocol for a DNA microarray is as follows:

• Isolate and purify mRNA from samples of interest.
• Reverse transcribe and label the mRNA.
• Hybridize the labeled target to the microarray.
• Scan the microarray and quantitate the signal.

What are the stages of microarray analysis?

… Preparation of a sample for the hybridization consists of the following steps: extraction of RNA, isolation of mRNA, quality assurance and concentration measurement, reverse transcription to cDNA, amplification and labeling (Macgregor & Squire, 2002) .

What is the purpose of microarray?

A microarray is a laboratory tool used to detect the expression of thousands of genes at the same time. DNA microarrays are microscope slides that are printed with thousands of tiny spots in defined positions, with each spot containing a known DNA sequence or gene.