Sep 17, 2014

Inference of Gorilla demographic and selective history from whole genome sequence data

Kimberly F. McManusMichael F. Hammer


While population-level genomic sequence data have been gathered extensively for humans, similar data from our closest living relatives are just beginning to emerge. Examination of genomic variation within great apes offers many opportunities to increase our understanding of the forces that have differentially shaped the evolutionary history of hominid taxa. Here, we expand upon the work of the Great Ape Genome Project by analyzing medium to high coverage whole genome sequences from 14 western lowland gorillas ( Gorilla gorilla gorilla ), 2 eastern lowland gorillas ( G. beringei graueri ), and a single Cross River individual ( G. gorilla diehli ). We infer that the ancestors of western and eastern lowland gorillas diverged from a common ancestor ∼261 thousand years ago (kya), and that the ancestors of the Cross River population diverged from the western lowland gorilla lineage ∼68 kya. Using a diffusion approximation approach to model the genome-wide site frequency spectrum, we infer a history of western lowland gorillas that includes an ancestral population expansion of ∼1.4-fold around ∼970 kya and a recent ∼5.6-fold contraction in population size ∼23 kya. The latter may correspond to a major reduction in African equatorial fo...Continue Reading

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Mentioned in this Paper

Demographic Analysis
Diffusion Weighted Imaging
Secretion of Saliva
Genome Assembly Sequence
Contraction (Finding)

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