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    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    The GIRK1 subunit potentiates G protein activation of cardiac GIRK1/4 hetero-tetramers

    Kouki K Touhara et al.
    The GIRK1 subunit contains a defective Na+-binding site but behaves as if it is permanently bound to a sodium ion, and therefore increases the affinity of Gβγ to GIRK1/4 hetero-tetrameric channels in lipid membranes.
    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

    Loss of neurofibromin Ras-GAP activity enhances the formation of cardiac blood islands in murine embryos

    Amanda D Yzaguirre et al.
    Ras-GAP activity suppresses the hemogenic potential of the embryonic heart.
    1. Cell Biology
    2. Developmental Biology

    Loss of the transcription factor Meis1 prevents sympathetic neurons target-field innervation and increases susceptibility to sudden cardiac death

    Fabrice Bouilloux et al.
    The transcription factor Meis1 is a dedicated maintenance factor for sympathetic neurons and controls the expression of key genes involved in endosome trafficking.
    1. Cell Biology

    The adhesion function of the sodium channel beta subunit (β1) contributes to cardiac action potential propagation

    Rengasayee Veeraraghavan et al.
    Structural and functional investigations identify a structural unit for ephaptic coupling in the heart, and provide the mechanistic basis for a novel strategy for the treatment of arrhythmias.
    1. Cell Biology

    Profound regulation of Na/K pump activity by transient elevations of cytoplasmic calcium in murine cardiac myocytes

    Fang-Min Lu et al.
    Transient Ca elevations of cytoplasmic calcium in cardiac myocytes profoundly activate cardiac Na/K pump activity in parallel with physical-chemical changes of the sarcolemma but without involvement of conventional signaling mechanisms.
    1. Cell Biology
    2. Human Biology and Medicine

    KChIP2 is a core transcriptional regulator of cardiac excitability

    Drew M Nassal et al.
    The ion channel accessory subunit KChIP2 has a transcriptional role that provides regulation over miRNA targets, driving the adverse remodeling of key ion channels during cardiac stress and leading to the development of arrhythmia.
    1. Chromosomes and Gene Expression
    2. Genetics and Genomics

    Transcription-factor-dependent enhancer transcription defines a gene regulatory network for cardiac rhythm

    Xinan H Yang et al.
    Transcription-factor-dependent noncoding RNA transcription illuminates components of a transcription-factor-dependent gene regulatory network that includes enhancer-associated long noncoding RNAs and is necessary for cardiac rhythm.
    1. Developmental Biology

    Early patterning and specification of cardiac progenitors in gastrulating mesoderm

    W Patrick Devine et al.
    Multipotent cardiac precursors within a population of mesoderm are rapidly fated to specific anatomic locations in the developing mouse heart.
    1. Cell Biology
    2. Developmental Biology

    Mitochondrial Ca2+ uptake by the voltage-dependent anion channel 2 regulates cardiac rhythmicity

    Hirohito Shimizu et al.
    Enhancing mitochondrial Ca2+ uptake effectively suppresses aberrant Ca2+ induced arrhythmogenic events in zebrafish, mouse and human cardiomyocytes, demonstrating a critical role for mitochondria in the regulation of cardiac rhythmicity.