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Gene conversion in the rice genome.

Shuqing Xu1, Terry Clark, Hongkun Zheng

  • 1Beijing Institute of Genomics of Chinese Academy of Sciences, Beijing Genomics Institute, Beijing Proteomics Institute, Beijing 101300, China. shuqing.xu@env.ethz.ch

BMC Genomics
|February 27, 2008
PubMed
Summary
This summary is machine-generated.

Gene conversion shapes rice genome evolution, with inter-chromosomal events being common. Pseudogenes may accelerate gene family evolution, particularly in pathogen-response genes.

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Area of Science:

  • Genomics
  • Molecular Evolution
  • Plant Genetics

Background:

  • Gene conversion is a non-reciprocal transfer of genetic information between similar DNA sequences.
  • It plays a role in homogenizing genes and introducing mutations, influencing multigene family evolution.
  • The rice genome's extensive gene duplication provides numerous opportunities for gene conversion.

Purpose of the Study:

  • To characterize the patterns and significance of gene conversion in the rice genome.
  • To investigate the relationship between gene conversion, chromosomal location, gene duplication, and pseudogenes.
  • To explore the potential role of gene conversion in the evolution of specific gene families, such as those involved in disease resistance.

Main Methods:

  • Identification of 626 multigene families in the rice genome.
  • Detection of 377 gene conversion events using the GENECONV program.
  • Analysis of conversion partner locations, physical distances, and segmental duplications.
  • Ka/Ks ratio analysis to assess the link between gene conversion and natural selection.
  • Comparison of gene conversion likelihood in pseudogenes with varying similarity to Arabidopsis genes.
  • Functional annotation of genes involved in conversion events.

Main Results:

  • Over 60% of detected gene conversions occurred between different chromosomes.
  • Specific inter-chromosomal conversion pairs (e.g., chromosomes 1 and 5) were significantly more frequent than expected.
  • Gene conversion frequency on the same chromosome decreased with increasing physical distance between partners.
  • Gene conversion in rice is not strongly correlated with natural selection (Ka/Ks analysis).
  • Conversions associated with segmental duplication were less than 10%.
  • Rice pseudogenes with lower similarity to Arabidopsis genes showed a higher propensity for gene conversion.
  • At least 14 multigene families related to disease or bacterial resistance were implicated in conversion events.

Conclusions:

  • Gene conversion, particularly involving pseudogenes, may accelerate the evolution of gene families in rice.
  • Gene conversion likely plays a role in the evolutionary adaptation of pathogen-response genes in rice.