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Related Concept Videos

Genetics of Speciation02:16

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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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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Related Experiment Video

Updated: Dec 18, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Population Structure, Stratification, and Introgression of Human Structural Variation.

Mohamed A Almarri1, Anders Bergström2, Javier Prado-Martinez1

  • 1Wellcome Sanger Institute, Hinxton CB10 1SA, UK.

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|June 13, 2020
PubMed
Summary

Structural variants are key to human genetic diversity but remain understudied. This analysis of 911 diverse genomes reveals 126,018 new variants, highlighting the need for broader genomic references.

Keywords:
Human Genome Diversity Projectarchaic introgressiondenisovadiverse genomesneanderthalrunaway duplicationssequences missing from the referencestructural variation

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Area of Science:

  • Genomics
  • Human Evolution
  • Population Genetics

Background:

  • Structural variants (SVs) significantly impact genetic diversity, evolution, and health.
  • Despite their importance, SVs are less understood compared to other genetic variations.
  • A comprehensive understanding of human genetic variation requires studying diverse populations.

Purpose of the Study:

  • To conduct a comprehensive analysis of structural variation in a diverse human population dataset.
  • To identify novel structural variants and understand their distribution and frequency across global populations.
  • To assess the limitations of the current human reference genome and the need for diverse genomic data.

Main Methods:

  • Analysis of high-coverage sequencing data from the Human Genome Diversity panel (911 samples, 54 populations).
  • Identification and characterization of structural variants, including duplications and insertions.
  • De novo assembly of 25 genomes using linked-read sequencing to discover breakpoint-resolved insertions.

Main Results:

  • Identified 126,018 structural variants, with 78% being novel compared to previous global projects.
  • Discovered population-specific variants, including runaway duplications and archaic hominin introgressed segments.
  • Characterized 1,643 unique insertions (1.9 Mb total sequence) absent from the GRCh38 reference genome.

Conclusions:

  • The study underscores the vastness of undiscovered structural variation in the human genome.
  • Population-specific variants reveal unique evolutionary histories and adaptations.
  • A single reference genome is insufficient; diverse, high-quality genomes are crucial for a complete understanding of human genetic variation.