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タイトル: | Chromosomal Inversion Polymorphisms in Two Sympatric Ascidian Lineages |
著者: | Satou, Yutaka https://orcid.org/0000-0001-5193-0708 (unconfirmed) Sato, Atsuko Yasuo, Hitoyoshi Mihirogi, Yukie Bishop, John Fujie, Manabu Kawamitsu, Mayumi Hisata, Kanako Satoh, Noriyuki |
著者名の別形: | 佐藤, ゆたか |
キーワード: | Ciona genomes chromosomal speciation |
発行日: | Jun-2021 |
出版者: | Oxford University Press (OUP) |
誌名: | Genome Biology and Evolution |
巻: | 13 |
号: | 6 |
論文番号: | evab068 |
抄録: | Chromosomal rearrangements can reduce fitness of heterozygotes and can thereby prevent gene flow. Therefore, such rearrangements can play a role in local adaptation and speciation. In particular, inversions are considered to be a major potential cause for chromosomal speciation. There are two closely related, partially sympatric lineages of ascidians in the genus Ciona, which we call type-A and type-B animals in the present study. Although these invertebrate chordates are largely isolated reproductively, hybrids can be found in wild populations, suggesting incomplete prezygotic barriers. Although the genome of type-A animals has been decoded and widely used, the genome for type-B animals has not been decoded at the chromosomal level. In the present study, we sequenced the genomes of two type-B individuals from different sides of the English Channel (in the zone of sympatry with type-A individuals) and compared them at the chromosomal level with the type-A genome. Although the overall structures were well conserved between type A and type B, chromosomal alignments revealed many inversions differentiating these two types of Ciona; it is probable that the frequent inversions have contributed to separation between these two lineages. In addition, comparisons of the genomes between the two type-B individuals revealed that type B had high rates of inversion polymorphisms and nucleotide polymorphisms, and thus type B might be in the process of differentiation into multiple new types or species. Our results suggest an important role of inversions in chromosomal speciation of these broadcasting spawners. |
著作権等: | ©The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/265301 |
DOI(出版社版): | 10.1093/gbe/evab068 |
PubMed ID: | 33822040 |
出現コレクション: | 学術雑誌掲載論文等 |
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