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Related Experiment Videos

Genetic information 'created' by archaebacterial DNA polymerase

N Ogata1, T Miura

  • 1Taiko Pharmaceutical Co., Ltd., Uchihonmachi 3-34-14, Suita, Osaka, Japan.

The Biochemical Journal
|June 1, 1997
PubMed
Summary

DNA polymerase from Thermococcus litoralis can create new DNA sequences without a template. This discovery suggests genetic information may flow from proteins to DNA, challenging central dogma principles.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA polymerase typically synthesizes DNA using a primer-template complex.
  • This process is fundamental to DNA replication and genetic information transfer.
  • No known mechanism allows DNA polymerase to create genetic information *de novo*.

Purpose of the Study:

  • To investigate the ability of DNA polymerase from *Thermococcus litoralis* to synthesize DNA independently of a primer-template.
  • To explore the implications of template-independent DNA synthesis for genetic information flow.
  • To characterize the DNA sequences synthesized *ab initio*.

Main Methods:

  • Utilizing DNA polymerase from *Thermococcus litoralis* under conditions lacking primer-template DNA.
  • Rigorous exclusion of DNA contamination through DNase I treatment and substrate purification.
  • Sequencing and characterization of the synthesized DNA products.

Main Results:

  • Demonstrated primer-template-independent DNA synthesis by *T. litoralis* DNA polymerase.
  • Synthesized up to 50,000 base pairs of linear double-stranded DNA *ab initio*.
  • Identified repetitive sequences, such as (CTAGATAT)n, in the synthesized DNA.

Conclusions:

  • DNA polymerase can synthesize genetic information without a template, challenging established biological paradigms.
  • The *ab initio* synthesized DNA sequences resemble repetitive satellite DNA found in organisms.
  • This finding opens the possibility of genetic information flow from protein to DNA.

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