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Related Experiment Video

Updated: Jun 4, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization

Published on: February 3, 2013

Testing for ancient admixture between closely related populations.

Eric Y Durand¹, Nick Patterson, David Reich

¹Department of Integrative Biology, University of California, Berkeley, CA, USA. eric.durand@berkeley.edu

Molecular Biology and Evolution

|February 18, 2011

Summary

This study introduces a new method to detect ancient admixture in human DNA by analyzing gene tree asymmetry. The D statistic test can identify archaic ancestry even without ancient samples, estimating its proportion.

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Area of Science:

Evolutionary Biology
Population Genetics
Genomics

Background:

Understanding archaic admixture in modern human genomes is a key evolutionary question.
Previous methods faced limitations in detecting ancient interbreeding events.

Purpose of the Study:

To develop and validate a novel statistical test for detecting ancient admixture.
To quantify archaic ancestry proportions in present-day populations.

Main Methods:

Developed a D statistic test based on gene tree frequency asymmetry in a three-population model.
Analyzed the test's sensitivity to demographic scenarios and sequencing errors.
Derived analytic expectations for the D statistic.

Main Results:

The D statistic effectively detects archaic admixture, including Neandertal-modern human interbreeding.
The test is robust to certain demographic assumptions and does not require archaic samples.
Methods were established to estimate archaic ancestry proportions and assess sequencing error impact.

Conclusions:

The D statistic provides a powerful tool for investigating ancient admixture events in human evolution.
This method enhances our ability to trace archaic genetic contributions to contemporary populations.