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Reposted by Axel Jensen

Evolutionary Biology at Uppsala University @evobiouppsala.bsky.social · 04/02/2025

Paper alert! @JesperBoman et al bring empirical evidence for the idea that #chromosome number differences between taxa can contribute to #speciation! onlinelibrary.wiley.com/doi/10.1111/...

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Reposted by Axel Jensen

Joana Meier @joanameier.bsky.social · 07/12/2024

I made a starter pack of speciation researchers. Please let me know if you or someone you know would like to be added. I am particularly sad that so far there are not many speciation researchers from the Global South represented. go.bsky.app/J7qDY56

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Axel Jensen @axeljensen.bsky.social · 02/12/2024

Not completely impartial, but this is an awesome system and an awesome group and PI! Apply!

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

More in the preprint, have a read! With Emma Horton, Junior Amboko, Stacy-Anne Parke, John Hart, Anthony Tosi, Katerina Guschanski and Kate Detwiler. This is what the Y chromosome donor species, the blue monkey, looks like (although a female so no Y chrom in this picture…)

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

as almost no introgression was present on the autosomes. This suggest that the introgressing Y chromosome swept to fixation from a very low initial frequency, which most likely required positive selection (we do some simulations to test this in the manuscript)…

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

This means that they were some 6 million years diverged at the time of introgression. This appears to be quite exceptional, and we have not been able to find any comparable events in the literature. Interestingly, it also seems that the Y was the only thing to introgress..

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

Dent’s monkey, the easternmost lineage of the mona species group, carries a Y chromosome that is nested within the blue monkey. These lineages diverged ca 7-8 million years ago. We demonstrate that introgression was indeed the cause, and that it occurred ca 1-2 mya…

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

This phenomenon is known as Haldane’s rule and effectively hinders the Y chromosome from introgressing (Y chromosome introgression is rare!). Indeed, we found that the Y chromosome phylogeny traced the species tree much closer than the mtDNA. With one pretty remarkable exception:

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

Knowing that males are more prone to disperse than females, the Y should in principle introgress as much or more than the maternally inherited mitochondrion. However, male hybrids, being heterogametic (in mammals), typically suffer reduced fitness relative to females…

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Axel Jensen @axeljensen.bsky.social · 15/03/2024

New preprint on a wild Y chromosome introgression between 6 my divergent primate species! Guenons are a diverse group of African primates that hybridized a lot in the past. In this study, we looked at patterns of Y introgression… www.biorxiv.org/content/10.1...

biorxiv.org

Breaking the rule: An exceptional Y chromosome introgression between deeply divergent primate species

bioRxiv - the preprint server for biology, operated by Cold Spring Harbor Laboratory, a research and educational institution

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