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Related Experiment Videos

The evolutionary dynamics of alpha-satellite.

M Katharine Rudd1, Gregory A Wray, Huntington F Willard

  • 1Institute for Genome Sciences & Policy, Duke University, Durham, North Carolina 27708, USA.

Genome Research
|December 14, 2005
PubMed
Summary

Human centromeres contain alpha-satellite DNA, crucial for evolution. This study reveals distinct evolutionary paths for higher-order and monomeric alpha-satellite types on chromosome 17.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Genetics

Background:

  • Alpha-satellite DNA is found at human centromeres and exhibits concerted evolution.
  • Two types exist: higher-order (multimeric) and monomeric (divergent) alpha-satellite.
  • Understanding their genomic and evolutionary relationships is key.

Purpose of the Study:

  • To examine the genomic and evolutionary relationships between higher-order and monomeric alpha-satellite.
  • To use chromosome 17 as a model system for this investigation.

Main Methods:

  • Focused on the chromosome 17 centromeric region.
  • Phylogenetic analysis of alpha-satellite types.
  • Comparative analysis with orthologous chimpanzee chromosomes.

Main Results:

  • Monomeric and higher-order alpha-satellites on chromosome 17 are phylogenetically distinct.
  • Higher-order alpha-satellite likely evolved independently of monomeric alpha-satellite.
  • Monomeric alpha-satellite evolves at a similar rate to adjacent non-alpha-satellite DNA, while higher-order alpha-satellite is less conserved.

Conclusions:

  • The two types of alpha-satellite exhibit distinct evolutionary trajectories.
  • Higher-order alpha-satellite shows a faster evolutionary rate compared to monomeric alpha-satellite and surrounding DNA.

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