TGFB1 and familial dilated cardiomyopathy: Furthermore, signalling molecules such as transforming growth factor‐β(TGF‐β) regulate this EndMT process by suppressing the expression of endothelial markers, and mitogen‐activated protein kinase (MAPK) signalling also participates in the development of DCM, with the inhibition of MAPK signalling attenuating DCM‐associated alterations 7, 8.