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Title: ZW sex chromosome structure in Amborella trichopoda

Journal Article · · Nature Plants (Online)
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4];  [3];  [1];  [1];  [1]; ORCiD logo [4];  [5];  [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [10]; ORCiD logo [3] more »; ORCiD logo [3]; ORCiD logo [11]; ORCiD logo [1] « less
  1. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States)
  2. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States); Auburn Univ., AL (United States)
  3. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States); USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
  4. USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Univ. of Lyon (France); Université Claude-Bernard Lyon 1 (UCBL) (France); Centre National de la Recherche Scientifique (CNRS) (France); French National Research Institute for Agriculture, Food and Environment (INRAE), Champenoux (France)
  7. Missouri Botanical Garden, St. Louis, MO (United States); Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS) (France)
  8. Montpellier Univ. (France); Centre National de la Recherche Scientifique (CNRS) (France)
  9. Indiana Univ., Bloomington, IN (United States)
  10. Univ. of Florida, Gainesville, FL (United States)
  11. Univ. of Georgia, Athens, GA (United States)

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 of 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 sequences and contains a homologue 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science (BSS)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2478745
Journal Information:
Nature Plants (Online), Journal Name: Nature Plants (Online) Journal Issue: 12 Vol. 10; ISSN 2055-0278
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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