Genetic barcoding systematically compares genes in del(5q) MDS and reveals a central role for CSNK1A1 in clonal expansion. - Stalmann USA; Ticconi F; Snoeren IAM; Li R; Gleitz HFE; Cowley GS; McConkey ME; Wong AB; Schmitz S; Fuchs SNR; Sood S; Leimkühler NB; et al. (Blood advances, 2022)