U2AF1 and essential thrombocythemia: Among others, the mutations involved in the DNA methylation (ASXL1, TET2, DNMT3A, IDH1, IDH2), histone modification (EZH2, ASXL1), and splicing (SF3B1, SRSF2, U2AF1, and ZRSR2), and mutations in the transcription factors genes (RUNX1, NFE2, PPM1D, and TP53) are most frequently found in ET pts [71, 72].