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#microarray

3 public questions tagged with this topic.

Protein-Protein Interaction

What type of microarray uses cell lysates?

Protein microarrays are classified by immobilized material and applications. Functional arrays spot purified proteins to test biochemical activities. Analytical arrays immobilize antibodies to measure protein abundance. Reverse-phase arrays invert format by using complex biological samples such as cell lysates, tissue extracts, or fractionated proteomes spotted on chip. These spots are then probed with specific antibodies or ligands. This format enables parallel profiling of post-translational modifications, signaling states, or biomarkers across many samples with limited volume, contrasting drug or antibody-only arrays.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Hybridization

Which assay uses a solid-phase microarray?

Protein microarray is a high-throughput platform where hundreds to thousands of purified proteins, antibodies, or peptides are immobilized in defined spots on functionalized glass slide or nitrocellulose membrane. This solid-phase array enables parallel analysis of protein expression, post-translational modifications, and interaction networks from minimal sample volume. Detection uses fluorescence, chemiluminescence, or SPR imaging. Western blot separates proteins electrophoretically, co-immunoprecipitation isolates complexes in solution, and PAGE is purely separative. Microarray format provides multiplexing advantage for proteome-wide screening and biomarker discovery under controlled conditions.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Cancer

Red spots in DNA microarray indicate genes that are

Overexpressed in cancer cells, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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