178 results found
    1. Evolutionary Biology

    Rampant tooth loss across 200 million years of frog evolution

    Daniel J Paluh et al.
    Teeth are maintained in two amphibian groups (caecilians and salamanders) but were lost in frogs over 20 times independently, a higher incidence of edentulism than any other major vertebrate group.
    1. Evolutionary Biology

    The skin microbiome facilitates adaptive tetrodotoxin production in poisonous newts

    Patric M Vaelli et al.
    Skin-associated bacteria underlie the production of a potent defensive neurotoxin in newts, impacting host physiology, molecular evolution, and predator-prey interactions in a coevolutionary arms race.
    1. Developmental Biology

    Arid3a regulates nephric tubule regeneration via evolutionarily conserved regeneration signal-response enhancers

    Nanoka Suzuki et al.
    Arid3a, a component of H3K9 me3 demethylases, regulates regeneration of the proximal nephric tubule through the evolutionarily conserved regeneration signal-response enhancer.
    1. Evolutionary Biology

    New light shed on the early evolution of limb-bone growth plate and bone marrow

    Jordi Estefa et al.
    A three-dimensional investigation of extinct-tetrapod limbs shows that even though bone elongation and blood-cell production are intimately related to mammal long bones, these functions actually appeared successively in tetrapod evolution.
    1. Developmental Biology
    2. Structural Biology and Molecular Biophysics

    Large, long range tensile forces drive convergence during Xenopus blastopore closure and body axis elongation

    David R Shook et al.
    Blastopore closure in Xenopus is driven by two morphogenic mechanisms that have strongly context dependent effects on tissue movement and that generate tensile force across tissues: convergent extension, as expected, and, unexpectedly, convergent thickening.
    1. Developmental Biology
    2. Evolutionary Biology

    Fgf-signaling is compartmentalized within the mesenchyme and controls proliferation during salamander limb development

    Sruthi Purushothaman et al.
    While movement of Fgf-signaling to the limb mesenchyme accompanied a shift in function, the ultimate outcome remains a convergent tetrapod limb phenotype.
    1. Ecology

    Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

    Kévin Rey et al.
    Two therapsid clades, dicynodonts and cynodonts, independently acquired and developed an endotherm-like thermoregulation during the Late Permian period, that probably helped them to survive the major global climate and environmental fluctuations of the end-Permian.
    1. Biochemistry and Chemical Biology
    2. Ecology

    De novo synthesis of a sunscreen compound in vertebrates

    Andrew R Osborn et al.
    Many vertebrates are able to synthesize a sunscreen compound de novo and the pathway involved can be used for heterologous production of the compound in yeast.
    1. Ecology

    No general relationship between mass and temperature in endothermic species

    Kristina Riemer et al.
    Data analysis of a large number of species indicates that a negative temperature-mass relationship is not common among species, which has been an ecological assumption for over a century.
    1. Structural Biology and Molecular Biophysics

    Work minimization accounts for footfall phasing in slow quadrupedal gaits

    James R Usherwood, Zoe T Self Davies
    The range of footfall patterns seen in walking amphibians, reptiles and mammals, including hippopotamus, horse and (inverted) sloth, are consistent with simple principles of mechanical work minimization.

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