We confirmed that 2 different shRNAs targeting MKL1 were able to decrease in SSc fibroblasts the expression of ACTA2 (encoding for ASMA), extracellular matrix associated genes (COL11A1, LOXL2, CTGF), a known myofibroblast transcription factor (GLI2) and a known profibrotic secreted factor (IGFBP7) (Fig. 4C). This evidence concerns the gene MRTFA and systemic sclerosis.