U2AF1 and myelodysplastic syndrome: These genes (U2AF1‐U2 small nuclear RNA auxiliary factor 1; ZRSR2‐U2 small nuclear ribonucleoprotein auxiliary factor 35 kDa subunit‐related protein 2) are involved in the spliceosome pathway and are reported to be mutated in approximately 5%–16% and 3%–11% of MDS cases, respectively.