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Deeply conserved synteny resolves early events in vertebrate evolution

Journal Article · · Nature Ecology and Evolution
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [5];  [10];  [9];  [7];  [11];  [12]
  1. Okinawa Inst. of Science and Technology Graduate Univ., Okinawa (Japan). Molecular Genetics Unit; Univ. of Vienna (Austria). Dept. of Neuroscience and Developmental Biology; OSTI
  2. Okinawa Inst. of Science and Technology Graduate Univ., Okinawa (Japan). Molecular Genetics Unit
  3. Université Côte d’Azur, Nice (France). Centre National de la Recherche Scientifique (CNRS). INSERM. IRCAN
  4. Univ. of California, Santa Cruz, CA (United States). Dept. of Biomolecular Engineering
  5. HudsonAlpha Inst. for Biotechnology, Huntsville, AL (United States)
  6. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
  7. Dovetail Genomics, Scotts Valley, CA (United States)
  8. Academia Sinica, Taipei (Taiwan). Inst. of Cellular and Organismic Biology
  9. Academia Sinica, Taipei (Taiwan). Inst. of Cellular and Organismic Biology
  10. Okinawa Inst. of Science and Technology Graduate Univ., Okinawa (Japan). Marine Genomics Unit
  11. Univ. of California, Santa Cruz, CA (United States). Dept. of Biomolecular Engineering
  12. Okinawa Inst. of Science and Technology Graduate Univ., Okinawa (Japan). Molecular Genetics Unit; Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; Chan Zuckerberg Biohub, San Francisco, CA (United States)

Although it is widely believed that early vertebrate evolution was shaped by ancient whole-genome duplications, the number, timing and mechanism of these events remain elusive. Here, we infer the history of vertebrates through genomic comparisons with a new chromosome-scale sequence of the invertebrate chordate amphioxus. We show how the karyotypes of amphioxus and diverse vertebrates are derived from 17 ancestral chordate linkage groups (and 19 ancestral bilaterian groups) by fusion, rearrangement and duplication. We resolve two distinct ancient duplications based on patterns of chromosomal conserved synteny. All extant vertebrates share the first duplication, which occurred in the mid/late Cambrian by autotetraploidization (that is, direct genome doubling). In contrast, the second duplication is found only in jawed vertebrates and occurred in the mid–late Ordovician by allotetraploidization (that is, genome duplication following interspecific hybridization) from two now-extinct progenitors. This complex genomic history parallels the diversification of vertebrate lineages in the fossil record.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1817164
Journal Information:
Nature Ecology and Evolution, Journal Name: Nature Ecology and Evolution Journal Issue: 6 Vol. 4; ISSN 2397-334X
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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