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Lagging Strand Synthesis01:59

Lagging Strand Synthesis

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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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Updated: Nov 29, 2025

High-Density DNA and RNA microarrays - Photolithographic Synthesis, Hybridization and Preparation of Large Nucleic Acid Libraries
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DNA synthesis for true random number generation.

Linda C Meiser1, Julian Koch1, Philipp L Antkowiak1

  • 1Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland.

Nature Communications
|November 19, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces DNA synthesis for generating vast quantities of true random numbers essential for secure data encryption. DNA offers a robust method for producing high-volume, high-quality random number generation for cybersecurity applications.

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Area of Science:

  • Chemistry
  • Computer Science
  • Genomics

Background:

  • Increasingly complex networks necessitate large volumes of securely encrypted data transmission.
  • Ensuring the security of sensitive information exchange relies on robust encryption and decryption schemes.
  • True random numbers are critical for guaranteeing the security of cryptographic processes.

Purpose of the Study:

  • To present a novel method for generating large volumes of true random numbers using DNA synthesis.
  • To evaluate the robustness and nucleotide distribution of commercial DNA synthesis methods for random number generation.
  • To assess the quality and quantity of randomness obtainable from DNA-based random number generation.

Main Methods:

  • Exploiting the stochastic nature of chemistry through the synthesis of DNA strands composed of random nucleotides.
  • Comparing three commercial random DNA synthesis services to assess robustness and nucleotide distribution.
  • Utilizing the von Neumann algorithm for data compression to mitigate bias.
  • Employing NIST's statistical test suite to rigorously assess the randomness of the generated numbers.

Main Results:

  • DNA synthesis can yield approximately 7 million gigabytes of randomness from a single synthesis run.
  • Readout of DNA-based random numbers is achievable using current sequencing technologies at rates of approximately 300 kB/s.
  • Commercial DNA synthesis methods show varying degrees of robustness and nucleotide distribution.

Conclusions:

  • DNA synthesis presents a viable and scalable approach for generating the massive volumes of true random numbers required for modern cybersecurity.
  • The von Neumann algorithm effectively removes bias, and NIST testing confirms the high quality of DNA-derived random numbers.
  • This method offers a promising solution for enhancing the security of encrypted data transmission in complex networks.