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Centromere emergence in evolution.

M Ventura1, N Archidiacono, M Rocchi

  • 1Sezione di Genetica-DAPEG, 70126 Bari, Italy.

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|April 3, 2001
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Summary
This summary is machine-generated.

Centromere repositioning, a puzzle in chromosome evolution, is explained by new evidence. Studies on lemur X chromosomes suggest centromere emergence, not inversions, drives these changes.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Comparative Genomics

Background:

  • Centromere repositioning is a poorly understood evolutionary phenomenon.
  • Previous studies on primate chromosome IX could not distinguish between pericentric inversions and centromere emergence hypotheses.

Purpose of the Study:

  • To investigate the evolutionary mechanisms of centromere repositioning.
  • To differentiate between pericentric inversions and de novo centromere formation.

Main Methods:

  • Comparative genomic analysis of the X chromosome in two lemur species (black lemur and ringtailed lemur).
  • Assessment of chromosome morphology (telocentric vs. metacentric) and marker order collinearity with humans.

Main Results:

  • The X chromosomes of the black lemur and ringtailed lemur exhibit different morphologies (telocentric and metacentric, respectively).
  • Despite morphological differences, marker order along the X chromosomes is perfectly collinear with human X chromosomes.
  • This collinearity challenges the pericentric inversion hypothesis.

Conclusions:

  • Centromere emergence is strongly supported as the primary mechanism for centromere repositioning.
  • This finding provides a clearer understanding of chromosome evolution in primates.