February 2024
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Several months earlier, other researchers had achieved the inaugural publication of the Chinese Lizardtail Herb ( Saururus chinensis ) genome dataset. However, the quality of that genome dataset is not deeply satisfactory, especially in terms of genome continuity (Contig N50 length ≈ 1.429 Mb) and gene-set completeness (BUSCO evaluation ≈ 91.32%). In this study, we present an improved chromosome-level genome of S. chinensis , characterized by heightened genome continuity (Contig N50 length ≈ 4.180 Mb) and a more complete gene-set (BUSCO evaluation ≈ 95.91%). Our investigation reveal that the extant S . chinensis genome preserves abundant vestiges of a paleo-tetraploidization event that are discernible both at the macroscopic chromosome level and within microscopic gene families, such as the PEL (pseudo-etiolation in light) family. Moreover, we elucidate that this paleo-tetraploidization event is associated with an expansion of the PEL family, potentially initiating a process conducive to its neofunctionalization and/or subfunctionalization.