|Classification and external resources|
|Patient UK||Diamond–Blackfan anemia|
Diamond–Blackfan anemia (DBA), also known as Blackfan-Diamond anemia, inherited pure red cell aplasia and as inherited erythroblastopenia, is a congenital erythroid aplasia that usually presents in infancy. DBA causes low red blood cell counts (anemia), without substantially affecting the other blood components (the platelets and the white blood cells), which are usually normal. This is in contrast to Shwachman–Bodian–Diamond syndrome, in which the bone marrow defect results primarily in neutropenia, and Fanconi anemia, where all cell lines are affected resulting in pancytopenia.
A variety of other congenital abnormalities may also occur in DBA.
Diamond–Blackfan anemia is characterized by normocytic(cite) or macrocytic(cite) anemia (low red blood cell counts) with decreased erythroid progenitors in the bone marrow. This usually develops during the neonatal period. About 47% of affected individuals also have a variety of congenital abnormalities, including craniofacial malformations, thumb or upper limb abnormalities, cardiac defects, urogenital malformations, and cleft palate. Low birth weight and generalized growth delay are sometimes observed. DBA patients have a modest risk of developing leukemia and other malignancies.
A diagnosis of DBA is made on the basis of anemia, low reticulocyte (immature red blood cells) counts, and diminished erythroid precursors in bone marrow. Features that support a diagnosis of DBA include the presence of congenital abnormalities, macrocytosis, elevated fetal hemoglobin, and elevated adenosine deaminase levels in red blood cells.
Most patients are diagnosed in the first two years of life. However, some mildly affected individuals only receive attention after a more severely affected family member is identified.
First noted by Joseph in 1936,:485 the condition is however named for Diamond and Blackfan, who described congenital hypoplastic anemia in 1938. Responsiveness to corticosteroids was reported in 1951.:485 In 1961, Diamond and colleagues presented longitudinal data on 30 patients and noted an association with skeletal abnormalities. In 1997, a region on chromosome 19 was determined to carry a gene mutated in some DBA. In 1999, mutations in the ribosomal protein S19 gene (RPS19) were found to be associated with disease in 42 of 172 DBA patients. In 2001, a second DBA gene was localized to a region of chromosome 8, and further genetic heterogeneity was inferred. Additional genes were subsequently identified.
With the exception of DBA rarely arising from mutation of transcription factor GATA1,(add citation) DBA arises from abnormal ribosomal protein genes. The disease is characterized by genetic heterogeneity, affecting different ribosomal gene loci:
|DBA1||19q13.2||603474||105650||RPS19||30S to 18S:291(cite)|
|DBA3||10q22-q23||602412||610629||RPS24||30S to 18S:291(cite)|
|DBA4||15q||180472||612527||RPS17||30S to 18S:291|
|DBA5||3q29-qter||180468||612528||RPL35A||32S to 5.8S/28S:291(cite)|
|DBA6||1p22.1||603634||612561||RPL5||32S to 5.8S/28S:291|
|DBA7||1p36.1-p35||604175||612562||RPL11||32S to 5.8S/28S:291|
|DBA8||2p25||603658||612563||RPS7||30S to 18S:291|
|DBA9||6p||603632||613308||RPS10||30S to 18S|
|DBA10||12q||603701||613309||RPS26||30S to 18S|
|DBA11||17p13||603704||614900||RPS26||30S to 18S|
|DBA12||3p24||604174||615550||RPL15||45S to 32S|
In 1997, a patient was identified who carried a rare balanced chromosomal translocation involving chromosome 19 and the X chromosome. This suggested that the affected gene might lie in one of the two regions that were disrupted by this cytogenetic anomaly. Linkage analysis in affected families also implicated this region in disease, and led to the cloning of the first DBA gene. About 20–25% of DBA cases are caused by mutations in the ribosome protein S19 (RPS19) gene on chromosome 19 at cytogenetic position 19q13.2. Some previously undiagnosed relatives of DBA patients were found to carry mutations, and also had increased adenosine deaminase levels in their red blood cells, but had no other overt signs of disease.
A subsequent study of families with no evidence of RPS19 mutations determined that 18 of 38 families showed evidence for involvement of an unknown gene on chromosome 8 at 8p23.3-8p22. The precise genetic defect in these families has not yet been delineated.
The genetic abnormalities underpinning the combination of DBA with Treacher Collins syndrome (TCS)/mandibulofacial dysostosis (MFD) phenotypes are heterogeneous, including RPS26 (the known DBA10 gene), TSR2 which encodes a direct binding partner of RPS26, and RPS28.
DBA Mutation Database.
The phenotype of DBA patients suggests a hematological stem cell defect specifically affecting the erythroid progenitor population. Loss of ribosomal function might be predicted to affect translation and protein biosynthesis broadly and impact many tissues. However, DBA is characterized by dominant inheritance, and arises from partial loss of ribosomal function, so it is possible that erythroid progenitors are more sensitive to this decreased function, while most other tissues are less affected.
Corticosteroids can be used to treat anemia in DBA. In a large study of 225 patients, 82% initially responded to this therapy, although many side effects were noted. Some patients remained responsive to steroids, while efficacy waned in others. Blood transfusions can also be used to treat severe anemia in DBA. Periods of remission may occur, during which transfusions and steroid treatments are not required. Bone marrow transplantation (BMT) can cure hematological aspects of DBA. This option may be considered when patients become transfusion-dependent because frequent transfusions can lead to iron overloading and organ damage. However, adverse events from BMTs may exceed those from iron overloading. An article published on Feb. 10, 2009  reported that an eight-year-old boy with a DBA-like disease has been successfully treated by supplementing his diet with the amino acids leucine and isoleucine. A 2007 study shows the efficacy of a similar treatment on a different patient. Larger studies are being conducted.
- Kaushansky, K; Lichtman, M; Beutler, E; Kipps, T; Prchal, J; Seligsohn, U. (2010). "35". Williams Hematology (8th ed.). McGraw-Hill. ISBN 978-0071621519.
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- Williamson, MA; Snyder, LM. (2015). "Chapter 9". Wallach's Interpretation of Diagnostic Tests (10th ed.). Lippincott Williams & Wilkins. ISBN 9781451191769.
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- Draptchinskaia N, Gustavsson P, Andersson B, Pettersson M, Willig TN, Dianzani I, Ball S, Tchernia G, Klar J, Matsson H, Tentler D, Mohandas N, Carlsson B, Dahl N (1999). "The gene encoding ribosomal protein S19 is mutated in Diamond–Blackfan anaemia.". Nat. Genet. 21 (2): 168–75. doi:10.1038/5951. PMID 9988267.
- Gazda H, Lipton JM, Willig TN, Ball S, Niemeyer CM, Tchernia G, Mohandas N, Daly MJ, Ploszynska A, Orfali KA, Vlachos A, Glader BE, Rokicka-Milewska R, Ohara A, Baker D, Pospisilova D, Webber A, Viskochil DH, Nathan DG, Beggs AH, Sieff CA (2001). "Evidence for linkage of familial Diamond–Blackfan anemia to chromosome 8p23.3-p22 and for non-19q non-8p disease.". Blood 97 (7): 2145–50. doi:10.1182/blood.V97.7.2145. PMID 11264183.
- Online Mendelian Inheritance in Man. Diamond-Blackfan anemia. Johns Hopkins University. 
- Boria, I; Garelli, E; Gazda, H. T.; Aspesi, A; Quarello, P; Pavesi, E; Ferrante, D; Meerpohl, J. J.; Kartal, M; Da Costa, L; Proust, A; Leblanc, T; Simansour, M; Dahl, N; Fröjmark, A. S.; Pospisilova, D; Cmejla, R; Beggs, A. H.; Sheen, M. R.; Landowski, M; Buros, C. M.; Clinton, C. M.; Dobson, L. J.; Vlachos, A; Atsidaftos, E; Lipton, J. M.; Ellis, S. R.; Ramenghi, U; Dianzani, I (2010). "The ribosomal basis of Diamond-Blackfan Anemia: Mutation and database update". Human Mutation 31 (12): 1269–79. doi:10.1002/humu.21383. PMID 20960466.
- Hoffbrand, AV; Moss PAH. (2011). Essential Haematology (6th ed.). Wiley-Blackwell. ISBN 978-1-4051-9890-5.
- Gazda HT, Grabowska A, Merida-Long LB; et al. (December 2006). "Ribosomal protein S24 gene is mutated in Diamond–Blackfan anemia". Am. J. Hum. Genet. 79 (6): 1110–8. doi:10.1086/510020. PMC 1698708. PMID 17186470.
- Cmejla R, Cmejlova J, Handrkova H, Petrak J, Pospisilova D (December 2007). "Ribosomal protein S17 gene (RPS17) is mutated in Diamond–Blackfan anemia". Hum. Mutat. 28 (12): 1178–82. doi:10.1002/humu.20608. PMID 17647292.
- Farrar JE, Nater M, Caywood E; et al. (September 2008). "Abnormalities of the large ribosomal subunit protein, Rpl35a, in Diamond–Blackfan anemia". Blood 112 (5): 1582–92. doi:10.1182/blood-2008-02-140012. PMC 2518874. PMID 18535205.
- Gazda H. T., Sheen M. R., Vlachos A; et al. (2008). "Ribosomal protein L5 and L11 mutations are associated with cleft palate and abnormal thumbs in Diamond-Blackfan anemia patients". The American Journal of Human Genetics 83 (6): 769–80. doi:10.1016/j.ajhg.2008.11.004. PMC 2668101. PMID 19061985.
- Online 'Mendelian Inheritance in Man' (OMIM) 603632
- Online 'Mendelian Inheritance in Man' (OMIM) 603701
- Online 'Mendelian Inheritance in Man' (OMIM) 604174
- Gripp K. W., Curry C, Olney A. H., Sandoval C, Fisher J, Chong J. X., UW , Genomics Mendelian, Pilchman L, Sahraoui R, Stabley D. L., Sol-Church K (2014). "Diamond-Blackfan anemia with mandibulofacial dystostosis is heterogeneous, including the novel DBA genes TSR2 and RPS28". American Journal of Medical Genetics 164A (9): 2240–9. doi:10.1002/ajmg.a.36633. PMID 24942156.
- Gazda H, Lipton JM, Willig TN; et al. (April 2001). "Evidence for linkage of familial Diamond–Blackfan anemia to chromosome 8p23.3-p22 and for non-19q non-8p disease". Blood 97 (7): 2145–50. doi:10.1182/blood.V97.7.2145. PMID 11264183.
- Vlachos A, Klein GW, Lipton JM (2001). "The Diamond Blackfan Anemia Registry: tool for investigating the epidemiology and biology of Diamond–Blackfan anemia.". J. Pediatr. Hematol. Oncol. 23 (6): 377–82. doi:10.1097/00043426-200108000-00015. PMID 11563775.
- Saunders, E. F.; Olivieri, N; Freedman, M. H. (1993). "Unexpected complications after bone marrow transplantation in transfusion-dependent children". Bone marrow transplantation. 12 Suppl 1: 88–90. PMID 8374573.
- Pospisilova D, Cmejlova J, Hak J, Adam T, Cmejla R (2007). "Successful treatment of a Diamond–Blackfan anemia patient with amino acid leucine.". Haematologica 92 (5): e66. doi:10.3324/haematol.11498. PMID 17562599.
- Diamond Blackfan Anemia Foundation (USA)
- Daniella Maria Arturi Foundation Research For The Cure (USA)
- GeneReviews/NCBI/NIH/UW entry on Diamond–Blackfan Anemia
- OMIM entries on Diamond–Blackfan Anemia
- Diamond–Blackfan Anemia research study of Inherited Bone Marrow Failure Syndromes (IBMFS)
- UK Diamond Blackfan Anaemia Charity
- Diamond Blackfan Anæmia International Support Group
- Diamond Blackfan Anemia Registry of North America (DBAR)
- Diamond–Blackfan anemia Genetics Home Reference