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Phylogenomic approaches to detecting and characterizing introgression.

Mark S Hibbins¹, Matthew W Hahn^1,2

¹Department of Biology, Indiana University, Bloomington, IN 47405, USA.

|November 17, 2021

Summary

Introgression, the transfer of genetic material between species, is common across life. New phylogenomic methods analyze whole-genome data to detect and understand these genetic exchanges.

Keywords:

hybridization introgression phylogenomic methods phylogenomics

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Area of Science:

Evolutionary Biology
Genomics
Bioinformatics

Background:

Phylogenomics has uncovered frequent introgression events throughout the tree of life.
Advances in whole-genome sequencing have spurred the development of methods to detect introgression.

Purpose of the Study:

To provide a comprehensive overview of genomic signals left by various introgression modes.
To detail current phylogenomic methods for detecting and characterizing introgression.
To discuss the strengths, limitations, and future directions for introgression detection methods.

Main Methods:

Utilizing multispecies coalescent expectations to infer introgression from genomic data.
Employing statistical tests like the D-statistic.
Applying model-based approaches for inferring phylogenetic networks.

Main Results:

Different introgression modes leave distinct, detectable signals within genomes.
Current methods vary in their power and applicability for detecting specific introgression signals.

Conclusions:

Phylogenomic methods are powerful tools for understanding introgression.
Addressing challenges in inferring introgression requires further methodological development.
Future research should focus on refining methods to better characterize complex introgression patterns.