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    1. Physics of Living Systems

    Downsizing the molecular spring of the giant protein titin reveals that skeletal muscle titin determines passive stiffness and drives longitudinal hypertrophy

    Ambjorn Brynnel et al.
    Genetically altering the size of the molecular spring element in the giant protein titin established that titin determines the stiffness of skeletal muscle and the number of sarcomeres in series.
    1. Cell Biology
    2. Physics of Living Systems

    Graded titin cleavage progressively reduces tension and uncovers the source of A-band stability in contracting muscle

    Yong Li et al.
    Elastic forces generated by the giant protein titin define both passive and active tension of skeletal muscle fibers and protect the sarcomeric myosin filaments from severe disruption during contraction.
    1. Medicine

    Effects of myosin variants on interacting-heads motif explain distinct hypertrophic and dilated cardiomyopathy phenotypes

    Lorenzo Alamo et al.
    Mapping the locations of hypertrophic cardiomyopathy gene variants onto the three-dimensional structures of contractile proteins revealed that these disrupt protein interactions are critical for normal cardiac relaxation and efficient energy usage.
    1. Developmental Biology

    Calcium handling precedes cardiac differentiation to initiate the first heartbeat

    Richard CV Tyser et al.
    High-resolution live imaging reveals how and when the mouse heart first starts to beat during development and how the onset of beating impacts on heart muscle cell maturation and heart formation.
    1. Cell Biology
    2. Developmental Biology

    Novel functions for integrin-associated proteins revealed by analysis of myofibril attachment in Drosophila

    Hannah J Green et al.
    Integrin and actin associated proteins are resolved into four layers within myofibril attachments, an architecture requiring balanced positive and negative regulation of integrin adhesion with integrated mechanotransduction and actin pathways.
    1. Developmental Biology
    2. Evolutionary Biology

    Evolutionary loss of foot muscle during development with characteristics of atrophy and no evidence of cell death

    Mai P Tran et al.
    Evolutionary loss of foot muscle in a bipedal rodent shares similarities with skeletal muscle atrophy, which is typically considered a pathological response to injury or disease.
    1. Developmental Biology

    SORBS2 is a genetic factor contributing to cardiac malformation of 4q deletion syndrome patients

    Fei Liang et al.
    Combined evidence of human genetics, in vitro cardiomyocyte differentiation, and mouse model indicates that SORBS2 is a regulator of second heart field development and its deficiency causes seemingly opposite atrial septal defects.
    1. Cell Biology

    A novel isoform of MAP4 organises the paraxial microtubule array required for muscle cell differentiation

    Binyam Mogessie et al.
    oMAP4 is a microtubule crosslinker that restricts motor driven microtubule motility and cooperates with microtubule motors in the establishment of paraxial microtubule arrangements in differentiating muscle cells.
    1. Cell Biology
    2. Developmental Biology

    Reduced matrix rigidity promotes neonatal cardiomyocyte dedifferentiation, proliferation and clonal expansion

    Yfat Yahalom-Ronen et al.
    Compliant matrix provides a permissive micoenvironment for cardiomyocyte dedifferentiation, cell division and expansion, and thus may open a new avenue towards cardiac regeneration.
    1. Physics of Living Systems

    Distinct contributions of the thin and thick filaments to length-dependent activation in heart muscle

    Xuemeng Zhang et al.
    The Frank–Starling law of the heart and its underlying mechanism of length-dependent activation involve distinctive structural changes in both the thin and thick filaments of cardiac muscle cells.