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Nat Rev Genet. 2001 Jul;2(7):549-55.

The evolution of isochores.

Author information

  • 1Centre for the Study of Evolution and School of Biological Sciences, University of Sussex, Brighton BN1 9QG, UK. a.c.eyre-walker@sussex.ac.uk

Abstract

One of the most striking features of mammalian chromosomes is the variation in G+C content that occurs over scales of hundreds of kilobases to megabases, the so-called 'isochore' structure of the human genome. This variation in base composition affects both coding and non-coding sequences and seems to reflect a fundamental level of genome organization. However, although we have known about isochores for over 25 years, we still have a poor understanding of why they exist. In this article, we review the current evidence for the three main hypotheses.

PMID:
11433361
[PubMed - indexed for MEDLINE]
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