PTPN23 haploinsufficiency or under-expression are associated with neurodevelopmental delays Bend et al. (2020), heart defects associated with cardiomyopathy Xu et al. (2024), and cancer growth Cao et al. (1998); Manteghi et al. (2016); Singh et al. (2023). Here, PTPN23 is linked to cardiomyopathy.