97 results found
    1. Cell Biology
    2. Genetics and Genomics
    3. Evolutionary Biology

    Phylogenetic divergence of cell biological features

    Michael Lynch
    Cell biological features are subject to stochastic forces of mutation and random genetic drift, which together cause lineages exposed to identical selection pressures to diverge, and mean phenotypes to deviate from expectations under optimizing selection.
    1. Neuroscience

    Mediodorsal thalamus is required for discrete phases of goal-directed behavior in macaques

    Evan Wicker et al.
    Transient suppression of activity in the macaque mediodorsal thalamus impairs adjustment of secondary reinforcer values and disrupts appropriate action selection in a reinforcer devaluation task; this profile is distinct from that of amygdala or subregions of orbitofrontal cortex.
    1. Cell Biology
    2. Developmental Biology

    Lamellar projections in the endolymphatic sac act as a relief valve to regulate inner ear pressure

    Ian A Swinburne et al.
    The pressure of fluid in the inner ear is controlled by opening of cellular valves in the endolymphatic sac to allow for regulated transepithelial fluid flow.
    1. Cell Biology
    2. Chromosomes and Gene Expression

    Reduced expression of C/EBPβ-LIP extends health and lifespan in mice

    Christine Müller et al.
    Reduced expression of a single transcription factor is sufficient to improve fitness and health at old age and increases the lifespan in female mice.
    1. Neuroscience

    Active avoidance requires inhibitory signaling in the rodent prelimbic prefrontal cortex

    Maria M Diehl et al.
    Avoiding danger requires inhibitory signaling in the prelimbic prefrontal cortex, as evidenced by optogenetic manipulations based on neuronal firing patterns.
    1. Ecology

    First bone-cracking dog coprolites provide new insight into bone consumption in Borophagus and their unique ecological niche

    Xiaoming Wang et al.
    Fossilized feces (coprolites) of extinct bone-crushing dogs, Borophagus parvus, from late Miocene (6 million years ago) of California demonstrates consumption and preservation of bones in digestive tracts and potential social hunting behavior by these predators.
    1. Neuroscience

    5-HT2a receptor in mPFC influences context-guided reconsolidation of object memory in perirhinal cortex

    Juan Facundo Morici et al.
    Serotonin, a neurotransmitter mostly studied in relation with emotions, also plays an important role in the control of episodic memories.
    1. Neuroscience

    Differential inputs to striatal cholinergic and parvalbumin interneurons imply functional distinctions

    Jason R Klug et al.
    A brain-wide mapping of the direct inputs to striatal cholinergic and parvalbumin interneurons reveals connectivity differences and implies their distinct roles in regulating striatal function.
    1. Developmental Biology
    2. Microbiology and Infectious Disease

    Flatworm-specific transcriptional regulators promote the specification of tegumental progenitors in Schistosoma mansoni

    George R Wendt et al.
    The specification of tegumental progenitor cells in Schistosoma mansoni relies on a pair of flatworm-specific transcription factors that are related to genes regulating epidermal specification in free-living flatworms.
    1. Neuroscience

    Hypoexcitability precedes denervation in the large fast-contracting motor units in two unrelated mouse models of ALS

    María de Lourdes Martínez-Silva et al.
    The most vulnerable motor units lose a fundamental firing property before the denervation of their muscle fibers in ALS mice, changing our view of the role of excitability in neurodegeneration.

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