Microarray

A Venn diagram outlining and contrasting some aspects of the fields of bio-MEMS, lab-on-a-chip, μTAS.

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 miniaturized, multiplexed and parallel processing and detection methods. The concept and methodology of microarrays was first introduced and illustrated in antibody microarrays (also referred to as antibody matrix) by Tse Wen Chang in 1983 in a scientific publication^[1] and a series of patents.^[2] The "gene chip" industry started to grow significantly after the 1995 Science Paper by the Ron Davis and Pat Brown labs at Stanford University.^[3] With the establishment of companies, such as Affymetrix, Agilent, Applied Microarrays, Arrayit, Illumina, and others, the technology of DNA microarrays has become the most sophisticated and the most widely used, while the use of protein, peptide and carbohydrate microarrays^[4] is expanding.

Types of microarrays include:

• DNA microarrays, such as cDNA microarrays, oligonucleotide microarrays, BAC microarrays and SNP microarrays
• MMChips, for surveillance of microRNA populations
• Protein microarrays
• Peptide microarrays, for detailed analyses or optimization of protein–protein interactions
• Tissue microarrays
• Cellular microarrays (also called transfection microarrays)
• Chemical compound microarrays
• Antibody microarrays
• Carbohydrate arrays (glycoarrays)
• Phenotype microarrays
• Reverse Phase Protein Microarrays, microarrays of lysates or serum
• interferometric reflectance imaging sensor (IRIS)

People in the field of CMOS biotechnology are developing new kinds of microarrays. Once fed magnetic nanoparticles, individual cells can be moved independently and simultaneously on a microarray of magnetic coils. A microarray of nuclear magnetic resonance microcoils is under development.^[5]

Notes

1. Tse-Wen Chang, TW (1983). "Binding of cells to matrixes of distinct antibodies coated on solid surface". Journal of Immunological Methods 65 (1–2): 217–23. doi:10.1016/0022-1759(83)90318-6. PMID 6606681.
2. http://www.google.com/patents/US4591570; http://www.google.com/patents/US4829010; http://www.google.com/patents/US5100777.[]
3. Schena, M.; Shalon, D.; Davis, R. W.; Brown, P. O. (1995). "Quantitative Monitoring of Gene Expression Patterns with a Complementary DNA Microarray". Science 270 (5235): 467–70. doi:10.1126/science.270.5235.467. PMID 7569999.
4. "Photogenerated glycan arrays identify immunogenic sugar moieties of Bacillus anthracis exosporium". Proteomics 7 (2): 180–184. 2007. doi:10.1002/pmic.200600478.
5. Ham, Donhee; Westervelt, Robert M. (2007). "The silicon that Moves and Feels Small Living Things". IEEE Solid-State Circuits Newsletter 12 (4): 4–9. doi:10.1109/N-SSC.2007.4785650.