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Recursive Paleohexaploidization Shaped the Durian Genome.

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Durian and cotton experienced different ancient whole-genome duplication events, not shared ones. This finding clarifies evolutionary rates and phylogenetic tree discrepancies in plant genomics.

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Area of Science:

  • Plant genomics
  • Evolutionary biology
  • Bioinformatics

Background:

  • The durian (Durio zibethinus) genome availability allows for detailed evolutionary analysis.
  • Previous studies suggested shared paleopolyploidization events between durian and cotton (Gossypium spp.).

Purpose of the Study:

  • To reanalyze the durian genome in comparison with other plant genomes.
  • To clarify the distinct polyploidization histories of durian and cotton.
  • To investigate the impact of polyploidization on gene evolutionary rates and phylogenetic reconstruction.

Main Methods:

  • Comparative genomics analysis of durian and cotton genomes.
  • Phylogenetic analysis of homologous genes.
  • Estimation of polyploidization event timing and impact on evolutionary rates.

Main Results:

  • Durian underwent hexaploidization approximately 19-21 million years ago (mya).
  • Cotton experienced decaploidization approximately 13-14 mya.
  • Decaploidization in cotton significantly elevated gene evolutionary rates (~64%) compared to durian, explaining previous overestimations.
  • Divergent evolutionary rates account for incongruence in reconstructed phylogenetic trees (98.4%).

Conclusions:

  • Durian and cotton possess distinct polyploidization histories.
  • Polyploidization events significantly influence gene evolutionary rates and phylogenetic inference.
  • Findings necessitate a reevaluation of existing phylogenetic trees in light of differential polyploidization impacts.