COL1A1 and cardiac hypertrophy: TAC‐induced myocardial hypertrophy and cardiac fibrosis were also attenuated upon HIPK1 knockdown (Figure 5c,d), accompanied with reduced expression of pathological hypertrophy marker genes (ANP, BNP, and β‐MHC) and fibrosis‐associated genes (Col1a1, Col3a1, and CTGF) (Figure 5e,f).