FUNCTION: Required for myofibril assembly and outgrowth of the cardiac chambers in the developing heart (By similarity). Appears to be catalytically inactive, showing no activity against O-acetyl-ADP-ribose (By similarity). {ECO:0000250|UniProtKB:Q6AZR2, ECO:0000250|UniProtKB:Q8BGK2}. SUBCELLULAR LOCATION: Cytoplasm, myofibril, sarcomere {ECO:0000250|UniProtKB:Q6AZR2}. SIMILARITY: Belongs to the ADP-ribosylglycohydrolase family. {ECO:0000305}. CAUTION: Although it belongs to the ADP-ribosylglycohydrolase family, lacks the metal-binding and substrate-binding residues, suggesting that it has no hydrolase activity. {ECO:0000250|UniProtKB:Q6AZR2}. |