ZW sex chromosome structure in Amborella trichopoda - Archive ouverte HAL
Article Dans Une Revue Nature Plants Année : 2024

ZW sex chromosome structure in Amborella trichopoda

Charlie Scutt
Eric B Knox
Douglas E Soltis
Pamela S Soltis
James Leebens-Mack
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Résumé

Sex chromosomes have evolved hundreds of times across the flowering plant tree of life; their recent origins in some members of this clade can shed light on the early consequences of suppressed recombination, a crucial step in sex chromosome evolution. Amborella trichopoda, the sole species on a lineage that is sister to all other extant flowering plants, is dioecious with a young ZW sex determination system. Here we present a haplotype-resolved genome assembly, including highly contiguous assemblies of the Z and W chromosomes. We identify a ~3-Megabase sex-determination region (SDR) captured in two strata that includes a ~300-Kilobase inversion that is enriched with repetitive sequence and contains a homolog of the Arabidopsis METHYLTHIOADENOSINE NUCLEOSIDASE (MTN1-2) genes, which are known to be involved in fertility. However, the remainder of the SDR does not show patterns typically found in non-recombining SDRs, such as repeat accumulation and gene loss. These findings are consistent with the hypothesis that dioecy is derived in Amborella and the sex chromosome pair has not significantly degenerated.
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Dates et versions

hal-04768060 , version 1 (05-11-2024)

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Sarah B Carey, Laramie Aközbek, John T Lovell, Jerry Jenkins, Adam L Healey, et al.. ZW sex chromosome structure in Amborella trichopoda. Nature Plants, 2024, 10, pp.1944-1954. ⟨10.1038/s41477-024-01858-x⟩. ⟨hal-04768060⟩
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