“Genomic analyses overturn two long‐standing homoploid hybrid speciation hypotheses”

Evolution ◽  
2021 ◽  
Author(s):  
Benjamin E. Goulet‐Scott ◽  
Austin G. Garner ◽  
Robin Hopkins
Keyword(s):  
Hybrid Speciation ◽  
Genomic Analyses ◽  
Homoploid Hybrid

scholarly journals The Timing and Direction of Introgression Under the Multispecies Network Coalescent

Genetics ◽  
2019 ◽  
Vol 211 (3) ◽  
pp. 1059-1073 ◽  
Author(s):  
Mark S. Hibbins ◽  
Matthew W. Hahn
Keyword(s):  
Statistical Methods ◽  
Biological Process ◽  
Genomic Data ◽  
Hybrid Speciation ◽  
Saccharomyces Paradoxus ◽  
Genomic Signatures ◽  
Wild Yeast ◽  
Other Information ◽  
Homoploid Hybrid ◽  
New Statistics

Introgression is a pervasive biological process, and many statistical methods have been developed to infer its presence from genomic data. However, many of the consequences and genomic signatures of introgression remain unexplored from a methodological standpoint. Here, we develop a model for the timing and direction of introgression based on the multispecies network coalescent, and from it suggest new approaches for testing introgression hypotheses. We suggest two new statistics, D1 and D2, which can be used in conjunction with other information to test hypotheses relating to the timing and direction of introgression, respectively. D1 may find use in evaluating cases of homoploid hybrid speciation (HHS), while D2 provides a four-taxon test for polarizing introgression. Although analytical expectations for our statistics require a number of assumptions to be met, we show how simulations can be used to test hypotheses about introgression when these assumptions are violated. We apply the D1 statistic to genomic data from the wild yeast Saccharomyces paradoxus—a proposed example of HHS—demonstrating its use as a test of this model. These methods provide new and powerful ways to address questions relating to the timing and direction of introgression.

scholarly journals Transient hybridization, not homoploid hybrid speciation, between ancient and deeply divergent conifers

2016 ◽  
Vol 103 (2) ◽  
pp. 246-259 ◽  
Author(s):  
J. R. P. Worth ◽  
M. J. Larcombe ◽  
S. Sakaguchi ◽  
J. R. Marthick ◽  
D. M. J. S. Bowman ◽  
...  
Keyword(s):  
Hybrid Speciation ◽  
Homoploid Hybrid

Homoploid hybrid speciation in action

Taxon ◽  
2010 ◽  
Vol 59 (5) ◽  
pp. 1375-1386 ◽  
Author(s):  
Richard J. Abbott ◽  
Matthew J. Hegarty ◽  
Simon J. Hiscock ◽  
Adrian C. Brennan
Keyword(s):  
Hybrid Speciation ◽  
Homoploid Hybrid

scholarly journals Behavioural isolation may facilitate homoploid hybrid speciation in cichlid fish

2013 ◽  
Vol 27 (2) ◽  
pp. 275-289 ◽  
Author(s):  
O. M. Selz ◽  
R. Thommen ◽  
M. E. Maan ◽  
O. Seehausen
Keyword(s):  
Cichlid Fish ◽  
Hybrid Speciation ◽  
Homoploid Hybrid

scholarly journals Homoploid hybrid speciation and genome evolution via chromosome sorting

2015 ◽  
Vol 282 (1807) ◽  
pp. 20150157 ◽  
Author(s):  
Vladimir A. Lukhtanov ◽  
Nazar A. Shapoval ◽  
Boris A. Anokhin ◽  
Alsu F. Saifitdinova ◽  
Valentina G. Kuznetsova
Keyword(s):  
Reproductive Isolation ◽  
Direct Consequence ◽  
Convincing Evidence ◽  
Interspecific Crosses ◽  
Parental Origin ◽  
Hybrid Speciation ◽  
Species Formation ◽  
Homoploid Hybrid ◽  
Creative Role

Genomes of numerous diploid plant and animal species possess traces of interspecific crosses, and many researches consider them as support for homoploid hybrid speciation (HHS), a process by which a new reproductively isolated species arises through hybridization and combination of parts of the parental genomes, but without an increase in ploidy. However, convincing evidence for a creative role of hybridization in the origin of reproductive isolation between hybrid and parental forms is extremely limited. Here, through studying Agrodiaetus butterflies, we provide proof of a previously unknown mode of HHS based on the formation of post-zygotic reproductive isolation via hybridization of chromosomally divergent parental species and subsequent fixation of a novel combination of chromosome fusions/fissions in hybrid descendants. We show that meiotic segregation, operating in the hybrid lineage, resulted in the formation of a new diploid genome, drastically rearranged in terms of chromosome number. We also demonstrate that during the heterozygous stage of the hybrid species formation, recombination was limited between rearranged chromosomes of different parental origin, representing evidence that the reproductive isolation was a direct consequence of hybridization.

Sign in / Sign up

Export Citation Format

Share Document