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DNA Microarrays02:34

DNA Microarrays

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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Related Experiment Video

Updated: Apr 23, 2026

Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications
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Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications

Published on: April 14, 2015

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Multiplex single-molecule interaction profiling of DNA-barcoded proteins.

Liangcai Gu1, Chao Li2, John Aach1

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.

Nature
|September 26, 2014
PubMed
Summary

This study introduces single-molecular-interaction sequencing (SMI-seq), a novel technology for high-throughput protein analysis. SMI-seq overcomes limitations of traditional methods, enabling precise protein quantification and interaction profiling at the single-molecule level.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • High-throughput protein analysis is hindered by ensemble measurements and purification challenges, impacting quality and cost.
  • Current single-molecule protein detection methods are limited by spectral overlap of chromophores.

Purpose of the Study:

  • To introduce single-molecular-interaction sequencing (SMI-seq) for parallel protein interaction profiling.
  • To leverage single-molecule advantages for enhanced protein analysis.
  • To demonstrate SMI-seq's capability in complex biological applications.

Main Methods:

  • Proteins are barcoded with DNA via ribosome display or enzymatic conjugation.
  • Barcoded proteins are assembled into a random single-molecule array in a polyacrylamide film.
  • DNA barcodes are amplified into in situ polymerase colonies (polonies) for DNA sequencing analysis.

Main Results:

  • SMI-seq enables precise protein quantification with a high array density (over one million polonies/mm²).
  • Protein interactions are measured by analyzing colocalized polonies derived from interacting protein barcodes.
  • Successful demonstration in G-protein coupled receptor and antibody-binding profiling.

Conclusions:

  • SMI-seq offers a powerful platform for high-throughput, single-molecule protein interaction analysis.
  • The technology facilitates 'library versus library' screening in a single assay.
  • SMI-seq simultaneously interrogates molecular binding affinity and specificity, advancing proteomic research.