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Lineage-specific variation in slow- and fast-X evolution in primates.

Ke Xu¹, Sohee Oh, Taesung Park

¹School of Biology, Georgia Institute of Technology, 310 Ferst Drive, Atlanta, Georgia 30332, USA.

Evolution; International Journal of Organic Evolution

|June 8, 2012

Summary

Evolutionary rates differ between X-linked and autosomal regions. Our study reveals consistent slow-X evolution across primates, with fast-X evolution varying by lineage and linked to male mutation bias.

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Area of Science:

Evolutionary biology
Genomics
Molecular evolution

Background:

X-linked and autosomal genomic regions exhibit distinct evolutionary dynamics.
The "slow-X" theory posits slower neutral substitution on the X chromosome due to reduced male germline exposure.
The "fast-X" theory suggests faster adaptive substitution on the X chromosome for partially recessive beneficial mutations.

Purpose of the Study:

To investigate lineage-specific variations in slow- and fast-X evolutionary processes.
To explore the interaction between male-biased mutation and adaptive evolution on the X chromosome.
To analyze genomic data from four primate species to understand these evolutionary mechanisms.

Main Methods:

Comparative genomics across four primate lineages.
Analysis of evolutionary rates for X-linked and autosomal regions.
Quantification of male mutation bias and its correlation with evolutionary rates.

Main Results:

Consistent evidence of slow-X evolution observed in all investigated primate lineages.
Evidence for fast-X evolution was lineage-specific, found in only a subset of primates.
The marmoset lineage, showing the strongest fast-X signal, had the lowest male mutation bias.

Conclusions:

Slow-X evolution is a conserved process across primate lineages.
The interplay between male mutation bias and selection efficacy shapes fast-X evolution.
Lineage-specific factors modulate the extent of slow- and fast-X evolutionary processes.