Powerful evolutionary history and gene content of intercourse chromosomes across diverse songbirds

Powerful evolutionary history and gene content of intercourse chromosomes across diverse songbirds

Songbirds have a species quantity nearly comparable to compared to animals, and generally are classic models for learning mechanisms of speciation and selection that is sexual. Intercourse chromosomes are hotspots of both procedures, yet their evolutionary history in songbirds stays uncertain. To elucidate that, we characterize feminine genomes of 11 songbird types having ZW sex chromosomes, with 5 genomes of bird-of-paradise species newly manufactured in this work. We conclude that songbird intercourse chromosomes have actually encountered at the least four actions of recombination suppression before their species radiation, creating a gradient pattern of pairwise series divergence termed ‘evolutionary strata’. Interestingly, the stratum that is latest probably emerged as a result of a songbird-specific rush of retrotransposon CR1-E1 elements at its boundary, or chromosome inversion regarding the W chromosome. The development of evolutionary strata has reshaped the genomic architecture of both intercourse chromosomes. We find stepwise variations of Z-linked inversions, repeat and GC contents, also W-linked gene loss price which are associated with the chronilogical age of strata. Read more

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