The two "rules of speciation" in species with young sex chromosomes

Molecular Ecology
D A Filatov

Abstract

The two "rules of speciation," Haldane's rule (HR) and the large-X effect (LXE), are thought to be caused by recessive species incompatibilities exposed in the phenotype due to the hemizygosity of X-linked genes in the heterogametic sex. Thus, the reports of HR and the LXE in species with recently evolved non- or partially degenerate Y-chromosomes, such as Silene latifolia and its relatives, were surprising. Here, I argue that rapid species-specific degeneration of Y-linked genes and associated adjustment of expression of X-linked gametologs (dosage compensation) may lead to rapid evolution of sex-linked species incompatibilities. This process is likely to be too slow in species with old degenerate Y-chromosomes (e.g., in mammals), but Y-degeneration in species with young gene-rich sex chromosomes may be fast enough to play a significant role in speciation. To illustrate this point, I report the analysis of Y-degeneration and the associated evolution of gene expression on the X-chromosome of S. latifolia and Silene dioica, a close relative that shares the same recently evolved sex chromosomes. Despite the recent (≤1MY) divergence of the two species, ~7% of Y-linked genes have undergone degeneration in one but not the other spec...Continue Reading

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Citations

Jul 5, 2018·Molecular Ecology·Jerry A Coyne
Aug 8, 2018·Molecular Ecology·Bret A PayseurDmitry A Filatov
Jan 24, 2019·Molecular Ecology·Loren RiesebergNolan Kane
Sep 11, 2019·The New Phytologist·Melinda PickupDavid L Field
May 24, 2019·PloS One·Paris Veltsos, Lynda F Delph
Mar 2, 2019·International Journal of Molecular Sciences·Naoko FujitaKen Komatsu
Jun 4, 2020·Genes·Marc KrasovecDmitry A Filatov
Oct 6, 2020·Evolution Letters·Christophe DufresnesDaniel L Jeffries
Sep 2, 2021·Proceedings of the National Academy of Sciences of the United States of America·Christophe DufresnesPierre-André Crochet

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