論文 - 詳細
| RRC ID | 64959 |
|---|---|
| 著者 | Yoshido A, Šíchová J, Pospíšilová K, Nguyen P, Voleníková A, Šafář J, Provazník J, Vila R, Marec F. |
| タイトル | Evolution of multiple sex-chromosomes associated with dynamic genome reshuffling in Leptidea wood-white butterflies. |
| ジャーナル | Heredity (Edinb) |
| Abstract |
Sex-chromosome systems tend to be highly conserved and knowledge about their evolution typically comes from macroevolutionary inference. Rapidly evolving complex sex-chromosome systems represent a rare opportunity to study the mechanisms of sex-chromosome evolution at unprecedented resolution. Three cryptic species of wood-white butterflies-Leptidea juvernica, L. sinapis and L. reali-have each a unique set of multiple sex-chromosomes with 3-4 W and 3-4 Z chromosomes. Using a transcriptome-based microarray for comparative genomic hybridisation (CGH) and a library of bacterial artificial chromosome (BAC) clones, both developed in L. juvernica, we identified Z-linked Leptidea orthologs of Bombyx mori genes and mapped them by fluorescence in situ hybridisation (FISH) with BAC probes on multiple Z chromosomes. In all three species, we determined synteny blocks of autosomal origin and reconstructed the evolution of multiple sex-chromosomes. In addition, we identified W homologues of Z-linked orthologs and characterised their molecular differentiation. Our results suggest that the multiple sex-chromosome system evolved in a common ancestor as a result of dynamic genome reshuffling through repeated rearrangements between the sex chromosomes and autosomes, including translocations, fusions and fissions. Thus, the initial formation of neo-sex chromosomes could not have played a role in reproductive isolation between these Leptidea species. However, the subsequent species-specific fissions of several neo-sex chromosomes could have contributed to their reproductive isolation. Then, significantly increased numbers of Z-linked genes and independent neo-W chromosome degeneration could accelerate the accumulation of genetic incompatibilities between populations and promote their divergence resulting in speciation. |
| 巻・号 | 125(3) |
| ページ | 138-154 |
| 公開日 | 2020-9-1 |
| DOI | 10.1038/s41437-020-0325-9 |
| PII | 10.1038/s41437-020-0325-9 |
| PMID | 32518391 |
| PMC | PMC7426936 |
| MeSH | Animals Butterflies* / genetics Evolution, Molecular* Female Sex Chromosomes* Synteny* |
| IF | 3.436 |
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