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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Admixture-driven structural variation diversity and its functional implications.

Haiyi Lou1, Yimin Wang2, Yu Chai1

  • 1State Key Laboratory of Genetics and Development of Complex Phenotypes, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China.

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|February 18, 2026
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Summary
This summary is machine-generated.

Population admixture significantly increases structural variation (SV) diversity, creating novel variants and influencing gene expression. This genomic diversification in admixed groups like Uyghurs offers evolutionary insights and impacts genetic medicine.

Keywords:
Uyghurancestry biasevolutionary dynamicslocal adaptationnon-allelic homologous recombination (NAHR)population admixturestructural variation (SV)

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Area of Science:

  • Population Genetics
  • Genomics
  • Evolutionary Biology

Background:

  • Population admixture is a key driver of genomic diversity.
  • The impact of admixture on structural variation (SV) dynamics and function is not well understood.
  • Uyghurs represent a model admixed Eurasian population with Western and Eastern ancestral contributions.

Purpose of the Study:

  • To comprehensively analyze structural variations (SVs) in the Uyghur population using whole-genome sequencing.
  • To investigate the relationship between admixture proportions and SV diversity.
  • To explore the functional consequences of SVs in admixed populations.

Main Methods:

  • Whole-genome sequencing of the Uyghur population.
  • Identification and characterization of high-confidence structural variations (SVs).
  • Analysis of SV diversity, ancestry proportions, and regulatory impacts.

Main Results:

  • Identified 9965 high-confidence SVs in Uyghurs, with 32% being novel.
  • Uyghurs exhibit 1.19-fold greater SV-transcription diversity than ancestral populations.
  • SV diversity shows a parabolic relationship with ancestry proportions, peaking at balanced contributions.
  • Admixture creates SV hotspots via non-allelic homologous recombination (NAHR); 60% of post-admixture SVs are flanked by repeats.
  • Admixture-induced SVs disproportionately regulate gene expression and disrupt immune/metabolic pathways.
  • Despite elevated SV diversity, pathogenic variant burden is comparable to ancestral populations, suggesting buffering.
  • Younger SVs are larger, have stronger regulatory impacts, and higher predicted pathogenicity.

Conclusions:

  • Population admixture acts as a dual force, driving genomic diversification and maintaining functional equilibrium.
  • Admixed populations expand genomic diversity beyond ancestral limits through novel variant combinations.
  • SV-aware approaches are crucial for genetic medicine, especially in admixed populations.