The study identifies RPS14 as the gene responsible for the 5q- syndrome through an RNA interference screen. The screen targets genes in the common deleted region (CDR) of the 5q- syndrome, focusing on those that block terminal erythroid differentiation. The study uses lentiviral shRNAs to knock down genes in CD34+ cells from umbilical cord blood. The ratio of mature (CD71+/GlyA+) to immature (CD71+/GlyA-) erythroid cells is measured by flow cytometry. RPS14 is identified as the only gene with a statistically significant effect on the erythroid/megakaryocytic ratio. Enrichment analysis of the shRNA screen shows that RPS14 is the only gene with a significant normalized enrichment score (NES). The study also shows that combinations of shRNAs targeting RPS14 and other 5q genes do not have an additive effect on the erythroid/megakaryocytic ratio. RPS14 expression is decreased in patients with 5q deletions compared to those without. The study confirms that RPS14 is expressed from the non-deleted allele and that there is no feedback mechanism to correct RPS14 levels. RPS14 overexpression induces an erythroid gene expression program in patients with the 5q-syndrome. The study also shows that RPS14 shRNAs induce apoptosis in TF-1 cells, while treatment with apoptosis-inducing agents results in high levels of apoptosis. RPS14 overexpression increases the 30S/18SE ratio, indicating a possible role in ribosome biogenesis. The study provides evidence that RPS14 is a key gene in the 5q- syndrome and highlights its role in erythroid differentiation and ribosome biogenesis.The study identifies RPS14 as the gene responsible for the 5q- syndrome through an RNA interference screen. The screen targets genes in the common deleted region (CDR) of the 5q- syndrome, focusing on those that block terminal erythroid differentiation. The study uses lentiviral shRNAs to knock down genes in CD34+ cells from umbilical cord blood. The ratio of mature (CD71+/GlyA+) to immature (CD71+/GlyA-) erythroid cells is measured by flow cytometry. RPS14 is identified as the only gene with a statistically significant effect on the erythroid/megakaryocytic ratio. Enrichment analysis of the shRNA screen shows that RPS14 is the only gene with a significant normalized enrichment score (NES). The study also shows that combinations of shRNAs targeting RPS14 and other 5q genes do not have an additive effect on the erythroid/megakaryocytic ratio. RPS14 expression is decreased in patients with 5q deletions compared to those without. The study confirms that RPS14 is expressed from the non-deleted allele and that there is no feedback mechanism to correct RPS14 levels. RPS14 overexpression induces an erythroid gene expression program in patients with the 5q-syndrome. The study also shows that RPS14 shRNAs induce apoptosis in TF-1 cells, while treatment with apoptosis-inducing agents results in high levels of apoptosis. RPS14 overexpression increases the 30S/18SE ratio, indicating a possible role in ribosome biogenesis. The study provides evidence that RPS14 is a key gene in the 5q- syndrome and highlights its role in erythroid differentiation and ribosome biogenesis.