BAG1 and Diamond-Blackfan anemia: Decreased protein levels of some common factors that are normally highly expressed in differentiating erythroid cells, such as BCL2-associated athanogene (BAG1), which encodes a HSP70 co-chaperone, and cold shock domain containing E1, RNA-binding (CSDE1), have been reported in mouse RP-deficient erythroblasts and erythroblasts cultured from DBA patients (Horos et al., 2012).