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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Gene Evolution - Fast or Slow?02:05

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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Genetic Variation01:25

Genetic Variation

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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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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Evolutionary Relationships through Genome Comparisons02:54

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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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Updated: Aug 9, 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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Genomic structural variation: A complex but important driver of human evolution.

Daniela C Soto1,2, José M Uribe-Salazar1,2, Colin J Shew1,2

  • 1Genome Center, MIND Institute, Department of Biochemstry & Molecular Medicine, University of California, Davis, California, USA.

American Journal of Biological Anthropology
|February 16, 2023
PubMed
Summary
This summary is machine-generated.

Structural variants (SVs) significantly shape great ape genomes, influencing traits, diseases, and evolution. Understanding these DNA changes is crucial for human evolutionary research.

Keywords:
braingene duplicationsgenomeshuman evolutionstructural variation

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Structural variants (SVs), including DNA duplications, deletions, and inversions, have significant genomic and functional impacts.
  • Identifying and assaying SVs is technically challenging compared to single-nucleotide variants.
  • New genomic technologies reveal SVs account for substantial differences across and within species, especially in humans and other primates.

Purpose of the Study:

  • To review the importance of SVs in human evolution.
  • To highlight how SVs shape great ape genomes, influencing traits and diseases.
  • To discuss the role of SVs in gene function, regulation, natural selection, and human brain evolution.

Main Methods:

  • Literature review of existing studies on structural variants in primates.
  • Analysis of genomic data to identify population and species-specific SVs.
  • Discussion of various genomic approaches for SV identification and their limitations.

Main Results:

  • SVs impact a larger number of nucleotides than single-nucleotide variants in great apes.
  • Many identified SVs show population and species specificity.
  • SVs have shaped primate genomes, creating regions associated with traits and diseases, influencing gene regulation, and contributing to human brain evolution.

Conclusions:

  • SVs are critical drivers of evolutionary change in great apes and humans.
  • Incorporating SV analysis into research is essential for a comprehensive understanding of genome evolution.
  • Future research should focus on integrating diverse data and biospecimens with advancing SV detection technologies.