Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Genome Res. 2006 Nov;16(11):1339-44. Epub 2006 Oct 25.

Exceptionally high levels of recombination across the honey bee genome.

Author information

  • 1Institute of Genetics, Heinrich Heine Universität Duesseldorf, Duesseldorf 40225, Germany. Martin.Beye@uni.duesseldorf.de

Abstract

The first draft of the honey bee genome sequence and improved genetic maps are utilized to analyze a genome displaying 10 times higher levels of recombination (19 cM/Mb) than previously analyzed genomes of higher eukaryotes. The exceptionally high recombination rate is distributed genome-wide, but varies by two orders of magnitude. Analysis of chromosome, sequence, and gene parameters with respect to recombination showed that local recombination rate is associated with distance to the telomere, GC content, and the number of simple repeats as described for low-recombining genomes. Recombination rate does not decrease with chromosome size. On average 5.7 recombination events per chromosome pair per meiosis are found in the honey bee genome. This contrasts with a wide range of taxa that have a uniform recombination frequency of about 1.6 per chromosome pair. The excess of recombination activity does not support a mechanistic role of recombination in stabilizing pairs of homologous chromosome during chromosome pairing. Recombination rate is associated with gene size, suggesting that introns are larger in regions of low recombination and may improve the efficacy of selection in these regions. Very few transposons and no retrotransposons are present in the high-recombining genome. We propose evolutionary explanations for the exceptionally high genome-wide recombination rate.

PMID:
17065604
[PubMed - indexed for MEDLINE]
PMCID:
PMC1626635
Free PMC Article

Images from this publication.See all images (1)Free text

Figure 1.
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk