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Related Concept Videos

Genome Copying Errors02:46

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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DNA Replication02:40

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...

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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
07:27

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Published on: April 29, 2010

P(rep) misestimates the probability of replication.

Geoffrey J Iverson1, Michael D Lee, Eric-Jan Wagenmakers

  • 1University of California, Irvine, California, USA.

Psychonomic Bulletin & Review
|March 19, 2009
PubMed
Summary
This summary is machine-generated.

The probability of replication (P(rep)) is proposed for identifying reliable psychological effects but misestimates true replication rates, particularly for small effects. This statistic is not useful for psychological science due to fundamental formulation issues.

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Area of Science:

  • Psychological science
  • Research methodology
  • Statistical inference

Background:

  • The probability of replication (P(rep)) has been suggested as a metric for assessing the reliability of scientific findings.
  • Ensuring the replicability of research is crucial for scientific progress and public trust.

Purpose of the Study:

  • To critically evaluate the accuracy and utility of P(rep) as a measure of replication probability in psychological research.
  • To identify the limitations and potential biases associated with the P(rep) statistic.

Main Methods:

  • A theoretical analysis of the P(rep) formulation.
  • Simulations and practical applications of P(rep) to predict replication over experimental series.

Main Results:

  • P(rep) systematically misestimates the true probability of replication, especially for small effect sizes.
  • The predictions made by P(rep) diverge significantly from actual replication probabilities across series of experiments.
  • Fundamental issues in the formulation of P(rep) underlie its poor performance.

Conclusions:

  • The P(rep) statistic is not a reliable or useful tool for psychological science.
  • Alternative methods are needed to accurately assess and predict the replicability of research findings.