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Multi-species Conserved Sequences02:51

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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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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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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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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Conserved Noncoding Elements Evolve Around the Same Genes Throughout Metazoan Evolution.

Paul Gonzalez1, Quinn C Hauck1, Andreas D Baxevanis1

  • 1Center for Genomics and Data Science Research, Division of Intramural Research, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.

Genome Biology and Evolution
|March 19, 2024
PubMed
Summary
This summary is machine-generated.

Conserved noncoding elements (CNEs) are ancient DNA sequences regulating gene expression. This study reveals CNEs repeatedly evolve around key developmental genes across diverse animal lineages, often originating from transposons.

Keywords:
cis-regulatory elementscomparative genomicsconserved noncoding elementshomeobox genes

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Developmental biology

Background:

  • Conserved noncoding elements (CNEs) are ancient DNA sequences conserved across species.
  • In vertebrates, CNEs often function as enhancers regulating critical developmental genes, including those encoding homeodomain transcription factors.
  • The evolutionary history and function of CNEs in non-vertebrate animals remain less understood.

Purpose of the Study:

  • To conduct a large-scale characterization of CNEs across major branches of the metazoan tree.
  • To investigate the evolutionary dynamics and genomic distribution of CNEs in Cnidaria, Mollusca, and Arthropoda.
  • To explore the relationship between CNEs, gene regulation, and the evolution of developmental mechanisms.

Main Methods:

  • Comparative genomics analysis of over 50 metazoan genomes.
  • Identification and reconstruction of the evolutionary appearance of hundreds of thousands of CNEs.
  • Analysis of the genomic distribution and association of CNEs with specific gene families.

Main Results:

  • Hundreds of thousands of CNEs were identified across Cnidaria, Mollusca, and Arthropoda.
  • CNEs exhibit recurring evolutionary patterns, frequently associating with homeodomain genes, other transcription factors, and neural development genes.
  • Transposons were confirmed as a significant source of CNEs, highlighting their role in shaping developmental gene regulation throughout animal evolution.

Conclusions:

  • CNEs are a widespread feature of animal genomes, playing conserved regulatory roles.
  • The repeated evolution of CNEs around similar gene sets suggests fundamental constraints and mechanisms in developmental gene regulation.
  • Transposon-derived CNEs have been crucial in the evolution of animal developmental complexity.