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			== DNA_microarray ==
			<gallery>
			File:From_spit_to_DNA-sample.webm\|From spit to DNA sample
			File:NA_hybrid.svg\|NA hybrid
			File:Microarray_exp_horizontal.svg\|Microarray exp horizontal
			File:Affymetrix-microarray.jpg\|Affymetrix microarray
			File:Microarray_printing.ogv\|Microarray printing
			File:Microarray-schema.jpg\|Microarray schema
			File:Summary_of_RNA_Microarray.svg\|Summary of RNA Microarray
			File:Heatmap.png\|Heatmap
			File:Toxicology_Research_at_FDA_(NCTR_1470)_(6009042166).jpg\|Toxicology Research at FDA (NCTR 1470)
			</gallery>

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2024-03-22T08:38:30Z

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'''DNA Microarray''' is a technology that allows scientists to examine thousands of [[gene]]s simultaneously, to understand their expression levels, and to identify genetic variations. This technology has revolutionized the field of [[genomics]], enabling large-scale studies that were previously not possible. DNA microarrays are also known as gene chips, DNA chips, or biochips.

==Overview==
A DNA microarray consists of a small, solid support, typically a glass slide, onto which DNA molecules are fixed in an orderly arrangement. These DNA molecules act as probes to detect complementary DNA or [[RNA]] sequences. When target sequences from a sample bind to these probes, they can be quantified, allowing for the analysis of gene expression or the identification of genetic variations.

==Types of DNA Microarrays==
There are two main types of DNA microarrays:
* '''cDNA Microarrays''': These are made by spotting cDNA onto the support. They are typically used for gene expression studies.
* '''Oligonucleotide Microarrays''': These contain short DNA fragments (oligonucleotides) that are synthesized directly onto the surface of the array. They can be used for both gene expression analysis and genotyping.

==Applications==
DNA microarray technology has a wide range of applications, including:
* '''Gene Expression Profiling''': Understanding the expression levels of genes in different conditions, such as healthy vs. diseased tissues.
* '''Genotyping and SNP Analysis''': Identifying genetic variations, such as single nucleotide polymorphisms (SNPs), which can be linked to disease susceptibility.
* '''Comparative Genomic Hybridization''': Comparing genomic DNA from different samples to identify genomic gains and losses.
* '''Pathogen Detection''': Identifying and typing pathogens by detecting their genetic material.

==Procedure==
The general procedure for using a DNA microarray involves:
# '''Sample Preparation''': Extracting RNA or DNA from the sample.
# '''Labeling''': Marking the extracted nucleic acids with fluorescent dyes.
# '''Hybridization''': Incubating the labeled samples with the microarray, allowing complementary sequences to bind.
# '''Scanning''': Using a laser to excite the fluorescent labels and a scanner to measure the intensity of fluorescence.
# '''Data Analysis''': Analyzing the data to interpret gene expression levels or to identify genetic variations.

==Challenges and Limitations==
While DNA microarray technology offers many advantages, there are also challenges and limitations, including:
* '''Cost''': The technology can be expensive, limiting its accessibility.
* '''Complexity of Data''': The vast amount of data generated requires sophisticated tools and expertise for analysis.
* '''Sensitivity and Specificity''': There can be issues with cross-hybridization and background noise, affecting the accuracy of the results.

==Future Directions==
Advancements in DNA microarray technology continue to expand its applications and improve its accuracy and affordability. Integration with other technologies, such as [[next-generation sequencing]], is opening new avenues for research and clinical diagnostics.

[[Category:Genomics]]
[[Category:Molecular biology]]
[[Category:Biotechnology]]

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DNA microarray - Revision history

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