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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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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.
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Modern Molecular Taxonomy01:29

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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Applications of Molecular Taxonomy01:20

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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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Phylogenetic Trees03:21

Phylogenetic Trees

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
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Related Experiment Video

Updated: Nov 10, 2025

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis
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Molluscan phylogenomics requires strategically selected genomes.

Julia D Sigwart1,2,3, David R Lindberg4, Chong Chen5

  • 1Senckenberg Research Institute, 60325 Frankfurt am Main, Germany.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 5, 2021
PubMed
Summary

Molluscan genomics research needs more diverse genome assemblies to understand evolutionary history. Current data lacks basal lineages, hindering insights into the evolution of this vast animal phylum.

Keywords:
AculiferaConchiferaMolluscaSerialiadisparitydiversification

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A Converging Strategy for the Generation of a Virtually Sequenced cDNA Library from Unreferenced Pacific Oysters
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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Zoology

Background:

  • Molluscs exhibit extraordinary body plan diversity, posing evolutionary questions.
  • Phylogenetic relationships among the eight molluscan classes remain debated.
  • Molluscs are the second-largest animal phylum, with significant biological and economic importance.

Purpose of the Study:

  • To highlight the limitations of current molluscan genome assemblies.
  • To emphasize the need for broader taxon sampling in future genomic projects.
  • To guide the selection of taxa for uncovering molluscan genome evolution and history.

Main Methods:

  • Review of existing genome assemblies in NCBI GenBank.
  • Analysis of taxonomic representation and lineage diversity in available data.
  • Identification of gaps in the phylogenetic tree for future research.

Main Results:

  • Only 53 genome assemblies exist, covering just four of eight molluscan classes.
  • Available genomes often represent fast-evolving or recently derived lineages.
  • Current data is insufficient for resolving deeper phylogenetic branches and understanding ancestral traits.

Conclusions:

  • A more comprehensive and phylogenetically balanced set of molluscan genomes is crucial.
  • Future genomic efforts should target underrepresented and basal lineages.
  • This approach will unlock deeper insights into molluscan evolution and biology.