Cited by 166Genomics and Phylogenetic StudiesChromosomal and Genetic VariationsDevelopmental Biology and Gene Regulation

Gene gain and loss across the metazoan tree of life

Open access
Fernández, Rosa, Gabaldón, Toni·2020·Nature Ecology & Evolution

Abstract

Although recent research has revealed high genomic complexity in the earliest-splitting animals and their ancestors, the macroevolutionary trends orchestrating gene repertoire evolution throughout the animal phyla remain poorly understood. We used a phylogenomic approach to interrogate genome evolution across all animal phyla. Our analysis uncovered a bimodal distribution of recruitment of orthologous genes, with most genes gained very ‘early’ (that is, at deep nodes) or very ‘late’, representing lineage-specific acquisitions. The emergence of animals was characterized by high values of gene birth and duplications. Deuterostomes, ecdysozoans and Xenacoelomorpha were characterized by no gene gain but rampant differential gene loss. Genes considered as animal hallmarks, such as Notch/Delta, were convergently duplicated in all phyla and at different evolutionary depths. Genes duplicated in all nodes from Metazoa to phylum-specific levels were enriched in functions related to the neural system, suggesting that this system has been continuously and independently reshaped throughout evolution across animals. Our results indicate that animal genomes evolved by unparalleled gene duplication followed by differential gene loss, and provide an atlas of gene repertoire evolution throughout the animal tree of life to navigate how, when and how often each gene in each genome was gained, duplicated or lost. Phylogenomic analysis including representatives of all metazoan phyla shows gene duplication followed by differential gene loss throughout the animal tree of life.

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  • The evolutionary dynamics of gene gain and loss, not only key innovations, shape the vast morphological disparity of animals.

    “it is not only key innovations but also the evolutionary dynamics of gene gain and loss that shape the vast morphological disparity of animals”

    From Current understanding on the Cambrian Explosion: questions and answers (2021) · cites this paper as Fernández and Gabaldón 2020

    The Conclusions link gene gain, duplication and loss to animal evolution and say their dynamics may have provided an arena for increased cell-type and tissue complexity. But the claim states more definitively that gene gain and loss shape animals’ morphological disparity; the paper says increased morphological complexity must involve other phenomena, including co-option following duplication. (LLM, conf=0.84)

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  • Under the ctenophore-sister scenario, these genes are most parsimoniously interpreted as arising on the myriazoan stem after the divergence of ctenophores, and include genes associated with neuronal function, development and cell adhesion.

    “Under the ctenophore-sister scenario, these are most parsimoniously interpreted as arising on the myriazoan stem after the divergence of ctenophores1,5,59, and include genes associated, in bilaterians and cnidarians, with neuronal function1,5,59, development58 and cell adhesion60.”

    From Ancient gene linkages support ctenophores as sister to other animals (2023) · cites this paper as [58]

    The Results and Discussion section on orthology-informed functions reports that genes gained at nodes from Metazoa to Nephrozoa were enriched for functions related to synapses and nervous-system development. The Methods say the reported analyses use a ctenophore-sister topology. The paper does not specifically place these genes on the myriazoan stem after ctenophores diverged; the citing sentence assigns development and cell adhesion to other references, not this one. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Comparisons among diverse genomes have identified numerous genes that are present in myriazoans but are absent in ctenophores.

    “Comparisons among diverse genomes have identified numerous genes that are present in myriazoans but are absent in ctenophores1,5,58.”

    From Ancient gene linkages support ctenophores as sister to other animals (2023) · cites this paper as [58]

    The Results and Discussion section on rampant gene loss reports high pairwise gene-loss values across animal taxa, supporting the general point that genome comparisons find genes present in one lineage but absent in another. It does not specifically identify numerous genes present in myriazoans but absent in ctenophores; the Methods mention Ctenophora only in discussing tree topology. No page numbers are available in our copy. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • Gene gains, losses and duplications dynamically evolved and have unbalanced distributions across the metazoan tree.

    “Gene gains, losses and duplications dynamically evolved and have unbalanced distributions across the tree”

    From Current understanding on the Cambrian Explosion: questions and answers (2021) · cites this paper as Fernández and Gabaldón 2020

  • Gene duplication ratio was high at deep nodes leading to metazoans and the birth rate decreased progressively as animals diversified into clades.

    “gene duplication ratio was high at deep nodes leading to metazoans and the birth rate decreased progressively as animals diversified into clades”

    From Current understanding on the Cambrian Explosion: questions and answers (2021) · cites this paper as Fernández and Gabaldón 2020

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Research works printed but not linked: 1

  1. [17]Emms DM Kelly S OrthoFinder2: fast and accurate phylogenomic orthology analysis from gene sequences 2018 10.1101/466201 · DOI

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Authors
Fernández, R., & Gabaldón, T.
Affiliations
  • Universitat Pompeu Fabra (ES)
  • Institució Catalana de Recerca i Estudis Avançats (ES)
Corresponding author
Gabaldón, Toni
Venue
Nature Ecology & Evolution
Published
2020-01-28
Volume
4
Issue
4
Pages
524-533
ISSN
2397-334X (ISSN-L)
OpenAlex
W3002804540
Cited by
165
References
42
Citations by year
2026: 9 · 2025: 26 · 2024: 24 · 2023: 31 · 2022: 35 · 2021: 25 · 2020: 14
FWCI
8.52
Type
journal article
Language
en
Open access
Locations
  • Nature Ecology & Evolution (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
  • Repositori digital de la UPF (Universitat Pompeu Fabra) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
gene gain, gene loss, gene duplication, metazoan phylogeny, Xenacoelomorpha, ecdysozoans, deuterostomes, animal origins, macroevolutionary trends
MeSH terms
Animals, Phylogeny, Genome, Evolution, Molecular, Gene Duplication, Genomics

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