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Related Concept Videos

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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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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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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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.
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Comparative Lesions Analysis Through a Targeted Sequencing Approach
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Comparative landscape genomics has arrived with a splash.

Cynthia Riginos1,2, Marlene Jahnke1

  • 1Department of Marine Sciences - Tjärnö Marine Laboratory, University of Gothenburg, Strömstad, Sweden.

Molecular Ecology
|November 17, 2023
PubMed
Summary

This study analyzed 31 fish species in the White River Basin, revealing that stream hierarchy is a primary driver of population structure across multiple species. This finding supports using watershed divisions for effective conservation and fisheries management.

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Area of Science:

  • Ecology
  • Genetics
  • Conservation Biology

Background:

  • Comparative methods are crucial for understanding biodiversity distribution and drivers across landscapes.
  • Landscape genetics has advanced with genomic tools, but multispecies studies remain limited.
  • Previous research often focuses on single species, hindering broad ecological insights.

Purpose of the Study:

  • To conduct a landmark comparative landscape genomics study on multiple freshwater fish species.
  • To test hypotheses regarding factors (river distance, barriers, stream hierarchy, environment) influencing population structure.
  • To assess commonalities in population structure drivers across co-distributed species.

Main Methods:

  • Surveyed 31 fish species from 75 locations in the White River Basin.
  • Genotyped each species for thousands of single nucleotide polymorphisms (SNPs).
  • Applied landscape genetics statistical tools to analyze population structure.

Main Results:

  • Stream hierarchy was the strongest predictor of population genetic structure across the surveyed fish species.
  • A significant alignment was observed between genetic spatial structure and stream hierarchies.
  • Commonalities in population structure drivers were identified at a large landscape scale.

Conclusions:

  • Stream hierarchy is a dominant factor shaping genetic diversity in freshwater fish populations.
  • Watershed divisions can be effectively used as distinct management units for conservation and fisheries.
  • This multispecies approach provides a validated framework for comparative landscape genomics.