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<p>We systematically examine the application of different phasing strategies to decrypt strawberry genome organization and produce a fully phased and accurate reference genome for <i>Fragaria x ananassa</i> cv. “EA78” (2n = 8x = 56). We identify 147&#xa0;bp canonical centromeric repeats across 50 strawberry chromosomes and uncover the formation of six neocentromeres through centromere turnover. Our findings indicate strawberry genomes have diverged centromeric satellite arrays among chromosomes, particularly across homoeologs, while maintaining high sequence similarity between homologs. We trace the evolutionary dynamics of centromeric repeats and find substantial centromere size expansion in wild and cultivated octoploids compared to the diploid ancestor, <i>F. vesca</i>.</p>

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A fully phased octoploid strawberry genome reveals the evolutionary dynamism of centromeric satellites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月3日

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  • Xin Jin,
  • Haiyuan Du,
  • Maoxian Chen,
  • Xu Zheng,
  • Yiying He,
  • Andan Zhu

摘要

We systematically examine the application of different phasing strategies to decrypt strawberry genome organization and produce a fully phased and accurate reference genome for Fragaria x ananassa cv. “EA78” (2n = 8x = 56). We identify 147 bp canonical centromeric repeats across 50 strawberry chromosomes and uncover the formation of six neocentromeres through centromere turnover. Our findings indicate strawberry genomes have diverged centromeric satellite arrays among chromosomes, particularly across homoeologs, while maintaining high sequence similarity between homologs. We trace the evolutionary dynamics of centromeric repeats and find substantial centromere size expansion in wild and cultivated octoploids compared to the diploid ancestor, F. vesca.