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Extreme heterogeneity in intercourse chromosome differentiation and dosage payment in livebearers

Friday, February 14th, 2020

Extreme heterogeneity in intercourse chromosome differentiation and dosage payment in livebearers


Morphologically and chromosomes have actually over and over repeatedly developed across the tree of life. Nonetheless, the level of differentiation amongst the intercourse chromosomes differs considerably across types. The Y chromosome gene activity decays, leaving genes on the sex chromosomes reduced to a single functional copy in males as sex chromosomes diverge. Mechanisms have actually developed to pay because of this decrease in gene dosage. Right right Here, we execute a relative analysis of intercourse chromosome systems across poeciliid species and discover variation that is extreme the amount of intercourse chromosome differentiation and Y chromosome degeneration. Furthermore, we find proof for the situation of chromosome-wide dosage compensation in seafood. Our findings have actually crucial implications for intercourse chromosome evolution and legislation.

As soon as recombination is halted involving the X and Y chromosomes, sex chromosomes start to differentiate and change to heteromorphism. Because there is a remarkable variation across clades into the level of intercourse chromosome divergence, much less is well known in regards to the variation in intercourse chromosome differentiation within clades. Right right Here, we combined whole-genome and transcriptome sequencing information to characterize the dwelling and preservation of sex chromosome systems across Poeciliidae, the livebearing clade that features guppies. We discovered that the Poecilia reticulata XY system is significantly more than formerly thought, being provided not merely having its sibling types, Poecilia wingei, but additionally with Poecilia picta, which diverged roughly 20 million years back. Inspite of the provided ancestry, we uncovered an extreme heterogeneity across these types when you look at the percentage for the intercourse chromosome with suppressed recombination, together with level of Y chromosome decay. (more…)