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Hybrid Zones

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.

Exon Recombination

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...

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Updated: Jul 21, 2025

Dissecting the Non-human Primate Brain in Stereotaxic Space

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Published on: July 16, 2009

Ghost admixture in eastern gorillas.

Harvinder Pawar¹, Aigerim Rymbekova^2,3, Sebastian Cuadros-Espinoza¹

¹Institute of Evolutionary Biology (UPF-CSIC), PRBB, Barcelona, Spain.

Nature Ecology & Evolution

|July 27, 2023

Summary

This summary is machine-generated.

Eastern gorillas carry archaic DNA from an ancient lineage, suggesting past admixture events in great apes. This genetic legacy, dating back millions of years, may influence traits like bitter taste perception.

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Area of Science:

Evolutionary biology
Genomics
Primate genetics

Background:

Archaic admixture, including Neanderthal and Denisovan introgression into modern humans, is a known factor in human evolution.
While archaic admixture has been observed in chimpanzees and bonobos, its occurrence in gorillas remains unexplored.

Purpose of the Study:

To investigate archaic admixture in all four extant gorilla subspecies using high-coverage whole-genome sequencing.
To model the demographic history of gorillas and identify signatures of introgression from extinct hominin lineages.

Main Methods:

Utilized approximate Bayesian computation with neural networks to analyze demographic history.
Sequenced whole genomes from all four gorilla subspecies, including newly sampled eastern gorillas.
Compared introgression patterns across gorillas, humans, and bonobos.

Main Results:

Detected a signature of admixture from an archaic 'ghost' lineage exclusively in the common ancestor of eastern gorillas, not western gorillas.
Inferred up to 3% of the eastern gorilla genome is introgressed from a lineage diverging over 3 million years ago.
Identified that introgression occurred before the split of mountain and eastern lowland gorillas, potentially influencing bitter taste perception.

Conclusions:

Archaic admixture is not exclusive to humans and occurred in gorillas, specifically eastern gorillas.
The X chromosome shows consistent depletion of introgressed fragments across gorillas, humans, and bonobos.
Protein-coding content shows no detectable depletion in eastern gorillas, possibly due to stronger genetic drift.