Functional & Integrative Genomics

, Volume 9, Issue 3, pp 287–292 | Cite as

Centromeres: long intergenic spaces with adaptive features

Review
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Abstract

Centromeres are composed of inner kinetochore proteins, which are largely conserved across species, and repetitive DNA, which shows comparatively little sequence conservation. Due to this fundamental paradox the formation and maintenance of centromeres remains largely a mystery. However, it has become increasingly clear that a long-standing balance between epigenetic and genetic control governs the interactions of centromeric DNA and inner kinetochore proteins. The comparison of classical neocentromeres in plants, which are entirely genetic in their mode of operation, and clinical neocentromeres, which are sequence-independent, illustrates the conflict between genetics and epigenetics in regions that control their own transmission to progeny. Tandem repeat arrays present in centromeres may have an origin in meiotic drive or other selfish patterns of evolution, as is the case for the CENP-B box and CENP-B protein in human. In grasses retrotransposons have invaded centromeres to the point of complete domination, consequently breaking genetic regulation at these centromeres. The accumulation of tandem repeats and transposons causes centromeres to expand in size, effectively pushing genes to the sides and opening the centromere to ever fewer constraints on the DNA sequence. On genetic maps centromeres appear as long intergenic spaces that evolve rapidly and apparently without regard to host fitness.

Keywords

Genome conflict Epigenetic Grass Human 
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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Plant Biology, Miller Plant Science BldgUniversity of GeorgiaAthensUSA
  2. 2.Department of GeneticsUniversity of GeorgiaAthensUSA

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