Abstract: The disclosure provides two-dimensional protein structures including first and second polypeptides that are different, each form homo-oligomers, and interact to form a rigid interface, polypeptide components of such two-dimensional protein structures, and uses thereof.

Abstract: Antibody particles are disclosed comprising polypeptides comprising an (Fc) binding domain, a helical polypeptide monomer, and an oligomer domain, and either Tie2 antibodies or dimers, or tumor necrosis factor receptor superfamily antibodies, and uses thereof.

Abstract: Disclosed herein are compositions including an embryonic ectoderm development (BED) polypeptide binder (EB) domain and a CRISPR associated protein 9 (CAS9) domain linked to the EB domain, and uses thereof for gene activation in a biological cell.

Abstract: Embodiments of the disclosure relate to methods and compositions for inducing maturation of cardiomyocytes. In some embodiments, the cardiomyocytes are derived from stem cells, in vitro. In some embodiments, the compositions and methods induce maturation by inducing overexpression of a Let7i microRNA (miRNA), overexpression of miR-452, reduced expression of miR-122, and/or reduced expression of miR-200a in the cardiomyocyte. In other embodiments, the disclosure relates to methods for treating conditions characterized by mitochondrial dysfunction, such as fatty acid oxidations disorders. In other embodiments, the disclosure relates to methods of screening for compounds that affect heart muscle function. In yet other embodiments, the disclosure relates to methods for detecting or monitoring mitochondrial dysfunction in a cell by detecting or monitoring the cardiolipin profile of the cell.

Abstract: The methods and compositions as disclosed herein describe the making of mature stem cell-derived cardiomyocytes for applications such as disease modeling, cardiotoxicity screening, drug screening and identification, among other uses. The methods involve physical and biochemical cues that promote a transition of stem cell-derived cardiomyocytes from a fetal phenotype to a more mature phenotype that more closely resembles that of adult cardiomyocytes.

Abstract: Provided herein are methods and compositions for maintaining human stem cells in either a nave state or a primed state, inducing, promoting, inhibiting, or controlling the transition from one state to another, and detecting the state of a stem cell. Also disclosed are compositions comprising substantially homogenous populations of primed state or nave state stem cells.

Abstract: Described herein are methods and compositions useful for inducing maturation of a cardiomyocyte to a mature (e.g., adult) phenotype, such that the function and morphology of the mature cardiomyocyte matches or more closely mimics that of the adult heart. The methods and compositions use Let-7 miRNAs and modified forms thereof. Such methods and compositions permit the study and treatment of adult-onset cardiac diseases, disorders or injuries with mature cardiomyocytes that mimic the heart function of an adult. Methods of using cardiomyocytes matured in this manner for drug identification and drug cardiotoxicity testing are also provided.

Abstract: The present disclosure provides methods and compositions to selectively modulate RNA processing. The methods and compositions selectively enhance or repress RNA processing by up- or down-regulating Drosha expression and/or by providing RNA sequences with mismatches introduced or removed 5 and/or 9-12 nucleotide positions from the Drosha cutting site. Therapeutic uses of the methods and compositions are also described.

Abstract: The present disclosure provides methods and compositions to selectively modulate RNA processing. The methods and compositions selectively enhance or repress RNA processing by up- or down-regulating Drosha expression and/or by providing RNA sequences with mis-matches introduced or removed 5 and/or 9-12 nucleotide positions from the Drosha cutting site. Therapeutic uses of the methods and compositions are also described.

Abstract: Described herein are methods and compositions useful for inducing maturation of a cardiomyocyte to a mature (e.g., adult) phenotype, such that the function and morphology of the mature cardiomyocyte matches or more closely mimics that of the adult heart. The methods and compositions use Let-7 miRNAs and modified forms thereof. Such methods and compositions permit the study and treatment of adult-onset cardiac diseases, disorders or injuries with mature cardiomyocytes that mimic the heart function of an adult. Methods of using cardiomyocytes matured in this manner for drug identification and drug cardiotoxicity testing are also provided.

Abstract: Methods and compositions for treating degenerative muscle conditions are disclosed. The compositions disclosed herein include S1P promoting compositions that include an S1P promoting agent. Embodiments of the methods disclosed herein include administering therapeutically effective amounts to subjects suffering from a degenerative muscle condition, such as, for example, subjects suffering from sarcopenia and subjects suffering from muscular dystrophy, including subjects suffering from Duchenne Muscular Dystrophy and Becker Muscular Dystrophy.