BLOC1S3 and Diamond-Blackfan anemia: Molecular pathogenesis studies showed that approximately half of all known DBA cases are attributed to mutations in the pre‐rRNA‐processing protein TSR2 [67, 68, 69, 70, 71, 72, 73, 74, 75, 76] and RP genes, primarily, but not exclusively, those of the small ribosomal 40S subunit.