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Related Concept Videos

DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
DNA-only Transposons02:57

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
DNA Microarrays02:34

DNA Microarrays

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...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

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Fluorescence-Based Multimodal DNA Logic Gates.

Chamika Harshani Algama1, Jamil Basir1, Kalani M Wijesinghe1

  • 1Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284, USA.

Nanomaterials (Basel, Switzerland)
|July 26, 2024
PubMed
Summary

Researchers developed simple DNA logic gates for molecular computing. These DNA logic gates utilize a proximity quenching and strand displacement strategy, enabling multimodal operations for advanced biosensing and biological computers.

Keywords:
DNA logic gatesfluorophorefour-way DNAmultimodalquencher

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Area of Science:

  • Molecular Biology
  • Nanotechnology
  • Biocomputing

Background:

  • DNA structures offer potential for molecular devices and computation systems.
  • Current DNA logic gate implementations are limited due to complex designs and working principles.

Purpose of the Study:

  • To design simple, multimodal DNA logic gates for versatile operations.
  • To establish a foundation for advanced molecular devices and computation systems.

Main Methods:

  • Designed simple four-way DNA logic gates.
  • Utilized proximity quenching of fluorophore-quencher pairs.
  • Employed toehold-mediated strand displacement (TMSD) strategy for gate operation.

Main Results:

  • Demonstrated fluorescence output solely dependent on oligonucleotide input, indicating successful gate opening.
  • Successfully created multimodal logic gates (YES, AND, OR, and combinations) with tunable displacement initiation sites.
  • Validated the effectiveness of the TMSD strategy in conjunction with proximity quenching.

Conclusions:

  • The developed four-way DNA logic gates provide a simple yet powerful platform for molecular operations.
  • This strategy holds significant promise for the development of biological computers.
  • The gates are suitable for next-generation smart molecular circuits with integrated biosensing capabilities.