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Related Concept Videos

Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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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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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.
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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.
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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A Graph-based Goat Pangenome Reveals Structural Variations Involved in Domestication and Adaptation.

Peipei Bian1, Jiaxin Li1, Shishuo Zhou1

  • 1Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China.

Molecular Biology and Evolution
|December 12, 2024
PubMed
Summary
This summary is machine-generated.

We created a goat pangenome and structural variation database to understand genome complexity. This resource identified novel genetic variations linked to goat domestication, immunity, and adaptation.

Keywords:
de novo assemblydomesticationgraph-based pangenomelow-coverage sequencingstructural variations

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Area of Science:

  • Genomics
  • Animal Genetics
  • Evolutionary Biology

Background:

  • Understanding genome complexity is crucial for species evolution.
  • Goat pangenomes offer insights into genetic diversity and adaptation.

Purpose of the Study:

  • To construct a comprehensive goat pangenome and structural variation database.
  • To identify genetic variations associated with goat domestication and adaptation.

Main Methods:

  • De novo phased long-read assemblies of eight goat breeds.
  • Construction of a graph-based pangenome and a long-read structural variation database.
  • Graph-based genotyping and selection signal analysis.

Main Results:

  • Discovery of 113-Mb novel autosomal sequences in goats.
  • Identification of 59,325 deletions, 84,910 insertions, and 24,954 complex SV alleles.
  • Detection of a novel immune-related domestication locus (galectin-9 and LGALS9L) and SVs linked to cashmere production and high-altitude adaptation.

Conclusions:

  • The goat pangenome and SV database are valuable resources for studying complex genomic variations.
  • Structural variations play a significant role in goat evolution, domestication, and adaptation.