Dec 8, 2015

Visualizing spatial population structure with estimated effective migration surfaces

Nature Genetics
Desislava PetkovaMatthew Stephens

Abstract

Genetic data often exhibit patterns broadly consistent with 'isolation by distance'-a phenomenon where genetic similarity decays with geographic distance. In a heterogeneous habitat, this may occur more quickly in some regions than in others: for example, barriers to gene flow can accelerate differentiation between neighboring groups. We use the concept of 'effective migration' to model the relationship between genetics and geography. In this paradigm, effective migration is low in regions where genetic similarity decays quickly. We present a method to visualize variation in effective migration across a habitat from geographically indexed genetic data. Our approach uses a population genetic model to relate effective migration rates to expected genetic dissimilarities. We illustrate its potential and limitations using simulations and data from elephant, human and Arabidopsis thaliana populations. The resulting visualizations highlight important spatial features of population structure that are difficult to discern using existing methods for summarizing genetic variation.

Mentioned in this Paper

Animal Migration
Isolation Aspects
Genetics, Population
Computer Programs and Programming
Cell Differentiation Process
Arabidopsis thaliana extract
Structure
Monte Carlo Method
Simulation
Asiatic Elephants

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