Abstract
Heterotaxy results from a failure to establish normal left-right asymmetry early in embryonic development. By whole exome sequencing, whole genome sequencing and high-throughput cohort resequencing we identified recessive mutations in matrix metallopeptidase 21 (MMP21), in nine index cases with heterotaxy. In addition, Mmp21 mutant mice and morphant zebrafish display heterotaxy and abnormal cardiac looping, respectively, suggesting a novel role for extra-cellular remodeling in the establishment of laterality in vertebrates.
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