The X chromosome of insects likely predates the origin of class Insecta.
| Autor: | Toups MA; Department of Life and Environmental Sciences, Bournemouth University, Poole, United Kingdom., Vicoso B; Institute of Science and Technology Austria, Klosterneuburg, Austria. |
|---|---|
| Jazyk: | angličtina |
| Zdroj: | Evolution; international journal of organic evolution [Evolution] 2023 Nov 02; Vol. 77 (11), pp. 2504-2511. |
| DOI: | 10.1093/evolut/qpad169 |
| Abstrakt: | Sex chromosomes have evolved independently multiple times, but why some are conserved for more than 100 million years whereas others turnover rapidly remains an open question. Here, we examine the homology of sex chromosomes across nine orders of insects, plus the outgroup springtails. We find that the X chromosome is likely homologous across insects and springtails; the only exception is in the Lepidoptera, which has lost the X and now has a ZZ/ZW sex-chromosome system. These results suggest the ancestral insect X chromosome has persisted for more than 450 million years-the oldest known sex chromosome to date. Further, we propose that the shrinking of gene content the dipteran X chromosome has allowed for a burst of sex-chromosome turnover that is absent from other speciose insect orders. (© The Author(s) 2023. Published by Oxford University Press on behalf of The Society for the Study of Evolution (SSE).) |
| Databáze: | MEDLINE |
| Externí odkaz: |
|