BLOC1S3 and Diamond-Blackfan anemia: We next used publically available ChIPseq data to extend our observations of GATA1 and/or PU.1 erythroid-specific occupancies to many additional RP genes and, moreover, we confirmed by ChIP the GATA1 and/or PU.1 binding in MEL chromatin for a subset of RP genes that are mutated in DBA.