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Use of Alu Element Containing Minigenes to Analyze Circular RNAs
13:10

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Published on: March 10, 2020

Modeling neutral evolution of Alu elements using a branching process.

Marek Kimmel1, Matthias Mathaes

  • 1Department of Statistics, Rice University, Houston, TX 77005, USA. kimmel@rice.edu

BMC Genomics
|February 18, 2010
PubMed
Summary
This summary is machine-generated.

Alu elements, comprising 11% of the human genome, may not evolve neutrally. Our model suggests AluY family sequences show deviations, indicating potential selection pressures acting on these mobile genetic elements.

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Area of Science:

  • Genomics
  • Molecular Evolution

Background:

  • Alu elements constitute approximately 11% of the human genome and are actively increasing in copy number.
  • Understanding the evolutionary dynamics of Alu elements, including amplification, mutation, and selection, is crucial due to their significant impact on genome structure.

Purpose of the Study:

  • To develop a theoretical neutral model for Alu element evolution.
  • To establish a framework for comparing empirical Alu insertion data with theoretical neutral frequencies to detect selection.

Main Methods:

  • A discrete-time branching process model, based on Griffiths and Pakes, was employed.
  • A limit frequency spectrum was derived to represent the theoretical neutral distribution of Alu elements.
  • Statistical goodness-of-fit tests were used to compare real Alu insertion data with the model's predictions.

Main Results:

  • Empirical Alu sequence data, specifically from the AluY family, were compared against the derived neutral model.
  • Systematic deviations were observed between the observed distributions of AluY sequences and the expected distribution under neutral evolution.

Conclusions:

  • The findings suggest that Alu sequences, particularly within the AluY family, do not adhere to a neutral evolutionary model.
  • These deviations imply that Alu elements may be subject to selective pressures shaping their distribution and evolution within the human genome.