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Atlas of Genetics and Cytogenetics in Oncology and Haematology OPEN ACCESS JOURNAL AT INIST-CNRS Gene Section Review PRDM1 (PR domain containing 1, with ZNF domain) Wayne Tam Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY, USA (WT) Published in Atlas Database: September 2011 Online updated version : http://AtlasGeneticsOncology.org/Genes/PRDM1ID41831ch6q21.html DOI: 10.4267/2042/46945 This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.0 France Licence. © 2012 Atlas of Genetics and Cytogenetics in Oncology and Haematology Transcription Identity The mRNAs encoded by PRDM1 have two transcript isoforms, PRDM1alpha and PRDM1beta, which are 5164 and 4675 bp long, respectively. The shorter isoform is generated by usage of the alternative promoter located in intron 3 and contains a different 5' untranslated region. It lacks the 5' inframe portion of the coding region present in PRDM1alpha. A deletion exon 6 (exon 7 in mice) variant has also been described (Schmidt et al., 2008). Other names: BLIMP-1, BLIMP1, PRDI-BF1 HGNC (Hugo): PRDM1 Location: 6q21 DNA/RNA Description The gene encompasses 23,6 kb DNA in humans, from 106534195 to 106557814 (hg19-Feb, 2009) in the long arm of chromosome 6. It encodes 7 exons. The open reading frame spans all 7 exons. Pseudogene None. Figure 1. Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 135 PRDM1 (PR domain containing 1, with ZNF domain) Tam W Figure 2. Protein Description PRDM1alpha is the larger isoform and contains 825 amino acids, with a predicted molecular weight of 92 kD. It has a PR domain at the N-terminal portion (86207 aa) of the protein, which is related to the SET domain (SM00317, SMART) found in many histone methyltransferases. In contrast to bona fide SETdomain proteins, the PR domain in PRDM1 does not possess intrinsic histone methyltransferase activity. Five C2H2-type zinc fingers (SM00355, SMART), which represent the DNA binding domain, are present at the C-terminal portion of the protein (575-707 aa). The middle part of PRDM1 (about 300-400 aa) is rich in proline and serine. PRDM1beta lacks the N-terminal 101 amino acids of the PRDM1alpha, and has a truncated PR domain. PRDM1beta has been shown to be functionally impaired in its transcriptional repression activity (Gyory et al., 2003). The proximal 3 zinc fingers in PRDM1/Blimp-1 delta exon 6 variant are disrupted (Schmidt et al., 2008). This protein variant has auto-regulatory potential through negative regulation of PRDM1/Blimp-1 expression and functions. Expression PRDM1/Blimp-1 is expressed in several tissues and organs, including hematopoietic tissues, skin, central nervous system, testis and gut. Within the hematopoietic system, PRDM1/Blimp-1 is expressed in plasma cells, B cells, T cells, natural killer cells, monocytes, granulocytes and dendritic cells. In the B cell population, PRDM1/Blimp-1 starts to be expressed when they are committed to undergo terminal differentiation (Cattoretti et al., 2005). Consistent with its expression in normal lymphoid cells, PRDM1 is also expressed in 100% of multiple myeloma, and in various frequency in B and T lymphomas (Garcia et al., 2006; D'Costa et al., 2009). PRDM1/Blimp-1 expression is regulated by a number of transcription activators and repressors (Martins and Calame, 2008). MicroRNAs have also been implicated in the down-regulation of PRDM1 in both normal germinal center B cells (Malumbres et al., 2009; Zhang et al., 2009; Gururajan et al., 2010) and in neoplastic lymphoid cells (Nie et Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 136 al., 2008; Nie et al., 2010). Among PRDM1 isoforms, PRDM1alpha is the most abundantly expressed, although relative abundance between PRDM1alpha and PRDM1beta may vary between cell types (Garcia et al., 2006). PRDM1/Blimp-1 delta 6 isoform is preferentially expressed in resting B cells (Schmidt et al., 2008). Localisation Nuclear. Function Mechanisms of action PRDM1/Blimp-1 is a transcription repressor that binds to specific DNA sequences through its zinc fingers, and functions as a scaffold for recruiting co-repressors that catalyze histone modifications. It has no known intrinsic histone methyltransferase activity. PRDM1/blimp-1 has been shown to mediate transcriptional silencing via interactions with H3 lysine methyltransferase G9a (Gyory et al., 2004), histone deacetylases HDAC1 and HDAC2 (Yu et al., 2000), and H3 lysine demethylase LSD1 (Su et al., 2009). PRDM1 can also tether Groucho family of transcription factors to mediate repression of gene transcription (Ren et al., 1999). Interaction of PRDM1/Blimp-1 with these co-repressors is mediated through the proline/serine rich domain and/or the zinc fingers. PRDM1 exerts its biological functions by repressing expressions of various target genes, which can be cell-type specific. For example, PRDM1/Blimp-1 mediates cell-cycle arrest in B cells by repressing c-myc, and in CD4 positive helper T cells by inhibiting expressions of IL-2 and Fos, an IL-2 activator (Martins and Calame, 2008). Biologic functions PRDM1 was originally identified as a novel repressor of human beta-interferon gene expression called PRDIBF1 (positive regulatory domain I binding factor 1) (Keller and Maniatis, 1991). Later Blimp-1 (B lymphocyte-induced maturation protein), which represents the murine homolog of PRDI-BF1(Huang, 1994), was discovered as a protein the enforced expression of which was sufficient to drive plasma cell differentiation of a mouse lymphoma cell line with an activated B cell phenotype (Turner et al., 1994). Studies since then have revealed a role of PRDM1/Blimp-1 in multiple cell types. PRDM1 (PR domain containing 1, with ZNF domain) Tam W PRDM1/Blimp-1 is the master regulator of plasma cell differentiation, critical for the generation of immunoglobulin-secreting plasma cells and maintenance of long-lived plasma cells (Shapiro-Shelef et al., 2003; Shapiro-Shelef et al., 2005; Martins and Calame, 2008). It mediates terminal B cell differentiation by extinguishing gene programs related to B cell signaling and proliferation (Shaffer et al., 2002), and allowing induction of XBP1 which coordinates phenotypic changes, including expansion of endoplasmic reticulum and increased protein synthesis, that define the plasma cell phenotype (Shaffer et al., 2004). PRDM1/Blimp-1 is also required for T cell homeostasis (Kallies et al., 2006; Martins et al., 2006; Calame, 2010). It attenuates proliferation and survival of CD4 positive helper T cells by repressing IL-2dependent activation; inhibits Th1 differentiation by down-regulating IFNgamma, Tbx21 and BCL6; and antagonizes BCL6-dependent follicular T cell differentiation. PRDM1/Blimp-1 also plays critical role in the differentiation of CD8-positive T cells. Besides its critical functions in B and T cells, PRDM1/Blimp-1 promotes differentiation of macrophages (Chang et al., 2000). It is also important for homeostatic development of dendritic cells as well as dendritic cell maturation (Chan et al., 2009). PRDM1/Blimp-1 negatively regulates NK cell activation by suppressing effector cytokine production (Smith et al., 2010). In the non-hematopoietic cell types, PRDM1/Blimp-1 plays an important role in the terminal differentiation of keratinocytes (Magnusdottir et al., 2007) and sebaceous cells (Sellheyer and Krahl, 2010). It also regulates postnatal reprogramming of intestinal enterocytes (Harper et al., 2011). Furthermore, PRDM1/Blimp-1 is required in embryonic developmental cell fate specification and organ morphogenesis, as demonstrated by mouse and zebrafish model systems (Bikoff et al., 2009). Blimp-1 specifies cell fate of primordial germ cells (Vincent et al., 2005), neural crests and neuron progenitors (Roy and Ng, 2004), and also muscle fiber identity (Baxendale et al., 2004; Hofsten et al., 2008). Blimp-1 is also critical for the normal development of the cardiovascular system, forelimbs and vibrissae (Robertson et al., 2007). Homology PRDM1 is conserved in chimpanzee, dog, cow, mouse, rat, chicken and zebrafish. Mutations Somatic Somatic mutations have been identified in diffuse large B cell lymphomas (DLBCL) at a frequency of about 8 to 23% (Tam et al., 2006; Pasqualucci et al., 2006; Mandelbaum et al., 2010). One group did not detect Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 137 mutations in 82 cases of DLBCLs in the Chinese population, suggesting geographic differences in PRDM1 mutations in DLBCL (Liu et al., 2007). PRDM1 mutations are exclusively detected in about 24 to 35% of the activated B cell(ABC)/non-germinal center B cell (non-GCB) subtype of DLBCL, and have not been identified in GCB-like DLBCL. In addition, about 20% of primary DLBCL of the central nervous system, a subtype of DLBCL, harbor PRDM1 mutations (Courts et al., 2008). PRDM1 mutation was also found in one case of primary effusion lymphoma out of 2 cases analyzed (Tate et al., 2007). The types of somatic mutations seen in PRDM1 include splice site mutations, frameshift insertion/deletion and less frequently, nonsense and missense mutations. The vast majority of these mutations result in inactivating truncations lacking one or more of the critical domains including PR, proline rich region, and the zinc fingers. Missense mutations have been demonstrated to affect PRDM1 functions (Mandelbaum et al., 2010). Most of the somatic mutations (about 90%) are associated with inactivation of the other allele by deletion, consistent with biallelic inactivation characteristic of a tumor suppressor gene. Mutations in acute leukemias and solid tumors have been not identified (Hangaishi and Kurokawa, 2010). Implicated in Diffuse large B cell lymphomas Prognosis Diffuse large B cell lymphoma (DLBCL) with partial plasmablastic differentiation, as indicated by PRDM1 expression, has a worse overall and failure free survival compared to conventional DLBLC without PRDM1 expression, suggesting that PRDM1 may be useful as a prognostic marker in DLBCL (Montes-Moreno et al., 2010). Expression of PRDM1beta has been implicated as a poor prognostic marker in DBLCL treated with CHOP (but not R-CHOP) and in T cell lymphomas. Resistance to chemotherapeutic agents mediated by PRDM1beta has been proposed as a potential mechanism (Liu et al., 2007; Zhao et al., 2008). Oncogenesis Inactivation or down-regulation of PRDM1 appears to be an important event in the pathogenesis of DLBCLs of the ABC/non-GCB subtype. In about 50% of DLBCLs of this subtype, PRDM1 is inactivated by truncating or missense mutations, biallele gene deletions or transcription repression by a constitutively active, translocated BCL6 (Mandelbaum et al., 2010). In non-GCB/ABC-like DLBCL without these genetic lesions, asynchronous PRDM1 mRNA and protein expressions have been observed, suggesting a posttranscriptional down-regulation (Mandelbaum et al., 2010; Nie et al., 2010). MicroRNAs have been postulated as a potential mechanism of down-regulation PRDM1 (PR domain containing 1, with ZNF domain) Tam W (Nie et al., 2010). All these findings are consistent with a tumor suppressor role of PRDM1 in DLBCL. In addition, PRDM1/Blimp-1 has been directly demonstrated in mouse models to function as a tumor suppressor gene (Calado et al., 2010; Mandelbaum et al., 2010). Mice lacking PRDM1/Blimp-1 are predisposed to develop lymphoproliferative disorders resembling human ABC-like DLBCL. One of these mouse models also demonstrated a cooperative pathogenic effect between PRDM1 inactivation and constitutive NF-kB activation. These findings suggest that PRDM1 inactivation contributes to the pathogenesis of ABC-like DLBCL by inhibiting terminal B cell differentiation induced by constitutive canonical NF-kB activation characteristically present in this lymphoma type. Natural killer cell neoplasms Oncogenesis PRDM1 is frequently (about 40%) deleted as part of a minimal deleted region in aggressive natural killer (NK) cell neoplasms such as extranodal NK/T cell lymphomas, nasal type, and aggressive NK cell leukemias (Iqbal et al., 2009; Karube et al., 2011). This deletion is generally associated with a down-regulation of PRDM1 expression, associated with focal hypermethylation of the 5' region of the other PRDM1 allele. Enforced expression of PRDM1 in NK lymphoma cell lines results in cell cycle arrest and apoptosis (Karube et al., 2011). Inactivating nonsense mutations have also been found in two NK cell lines and one clinical NK neoplasm (Iqbal et al., 2009; Karube et al., 2011). These findings indicate a tumor suppressor role of PRDM1 in NK cell neoplasms. Radiation-therapy induced second malignant neoplasms Prognosis Pediatric Hodgkin lymphoma patients treated by radiation are at risk of developing second malignancies later in life. Two SNP variants were identified at 6q21 (intergenic between ATG5 and PRDM1) in a genome wide association study that are associated with increased risk of second neoplasms for pediatric patients with Hodgkin lymphoma who received radiation therapy. These variants correlate with decreased basal PRDM1 expression and reduced PRDM1 induction after radiation therapy, implicating PRDM1 in the etiology of radiation-therapy induced second malignancies (Best et al., 2011). Plasma cell myeloma Oncogenesis PRDM1 is consistently expressed in plasma cell myeloma. A plasmacytoma transgenic mouse model demonstrates that PRDM1/Blimp-1 is not a tumor suppressor gene in myeloma. Instead, it appears to be a limiting factor in plasma cell transformation (D'Costa et al., 2009). Reducing PRDM1/Blimp-1 dosage Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 138 decreases incidence of plasmacytoma in mice but does not cause reduction of normal plasma cells in nontransgenic mice. Loss of PRDM1/Blimp-1 eliminates plasmacytoma development. References Keller AD, Maniatis T. Identification and characterization of a novel repressor of beta-interferon gene expression. Genes Dev. 1991 May;5(5):868-79 Huang S. Blimp-1 is the murine homolog of the human transcriptional repressor PRDI-BF1. Cell. 1994 Jul 15;78(1):9 Turner CA Jr, Mack DH, Davis MM. Blimp-1, a novel zinc finger-containing protein that can drive the maturation of B lymphocytes into immunoglobulin-secreting cells. Cell. 1994 Apr 22;77(2):297-306 Ren B, Chee KJ, Kim TH, Maniatis T. PRDI-BF1/Blimp-1 repression is mediated by corepressors of the Groucho family of proteins. Genes Dev. 1999 Jan 1;13(1):125-37 Chang DH, Angelin-Duclos C, Calame K. BLIMP-1: trigger for differentiation of myeloid lineage. Nat Immunol. 2000 Aug;1(2):169-76 Yu J, Angelin-Duclos C, Greenwood J, Liao J, Calame K. Transcriptional repression by blimp-1 (PRDI-BF1) involves recruitment of histone deacetylase. Mol Cell Biol. 2000 Apr;20(7):2592-603 Shaffer AL, Lin KI, Kuo TC, Yu X, Hurt EM, Rosenwald A, Giltnane JM, Yang L, Zhao H, Calame K, Staudt LM. Blimp-1 orchestrates plasma cell differentiation by extinguishing the mature B cell gene expression program. 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The zinc finger transcriptional repressor Blimp1/Prdm1 is dispensable for early axis formation but is required for specification of primordial germ cells in the mouse. Development. 2005 Mar;132(6):131525 Garcia JF, Roncador G, García JF, Sánz AI, Maestre L, Lucas E, Montes-Moreno S, Fernandez Victoria R, MartinezTorrecuadrara JL, Marafioti T, Mason DY, Piris MA. PRDM1/BLIMP-1 expression in multiple B and T-cell lymphoma. Haematologica. 2006 Apr;91(4):467-74 Kallies A, Hawkins ED, Belz GT, Metcalf D, Hommel M, Corcoran LM, Hodgkin PD, Nutt SL. Transcriptional repressor Blimp-1 is essential for T cell homeostasis and self-tolerance. Nat Immunol. 2006 May;7(5):466-74 Martins GA, Cimmino L, Shapiro-Shelef M, Szabolcs M, Herron A, Magnusdottir E, Calame K. Transcriptional repressor Blimp1 regulates T cell homeostasis and function. Nat Immunol. 2006 May;7(5):457-65 Pasqualucci L, Compagno M, Houldsworth J, Monti S, Grunn A, Nandula SV, Aster JC, Murty VV, Shipp MA, Dalla-Favera R. Inactivation of the PRDM1/BLIMP1 gene in diffuse large B cell lymphoma. J Exp Med. 2006 Feb 20;203(2):311-7 Tam W, Gomez M, Chadburn A, Lee JW, Chan WC, Knowles DM. Mutational analysis of PRDM1 indicates a tumorsuppressor role in diffuse large B-cell lymphomas. Blood. 2006 May 15;107(10):4090-100 Liu YY, Leboeuf C, Shi JY, Li JM, Wang L, Shen Y, Garcia JF, Shen ZX, Chen Z, Janin A, Chen SJ, Zhao WL. Rituximab plus CHOP (R-CHOP) overcomes PRDM1-associated resistance to chemotherapy in patients with diffuse large B-cell lymphoma. Blood. 2007 Jul 1;110(1):339-44 Magnúsdóttir E, Kalachikov S, Mizukoshi K, Savitsky D, IshidaYamamoto A, Panteleyev AA, Calame K. Epidermal terminal differentiation depends on B lymphocyte-induced maturation protein-1. Proc Natl Acad Sci U S A. 2007 Sep 18;104(38):14988-93 Robertson EJ, Charatsi I, Joyner CJ, Koonce CH, Morgan M, Islam A, Paterson C, Lejsek E, Arnold SJ, Kallies A, Nutt SL, Bikoff EK. 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Am J Pathol. 2008 Jul;173(1):242-52 Schmidt D, Nayak A, Schumann JE, Schimpl A, Berberich I, Berberich-Siebelt F. Blimp-1Deltaexon7: a naturally occurring Blimp-1 deletion mutant with auto-regulatory potential. Exp Cell Res. 2008 Dec 10;314(20):3614-27 von Hofsten J, Elworthy S, Gilchrist MJ, Smith JC, Wardle FC, Ingham PW. Prdm1- and Sox6-mediated transcriptional Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 139 repression specifies muscle fibre type in the zebrafish embryo. EMBO Rep. 2008 Jul;9(7):683-9 Zhao WL, Liu YY, Zhang QL, Wang L, Leboeuf C, Zhang YW, Ma J, Garcia JF, Song YP, Li JM, Shen ZX, Chen Z, Janin A, Chen SJ. PRDM1 is involved in chemoresistance of T-cell lymphoma and down-regulated by the proteasome inhibitor. Blood. 2008 Apr 1;111(7):3867-71 Bikoff EK, Morgan MA, Robertson EJ. An expanding job description for Blimp-1/PRDM1. Curr Opin Genet Dev. 2009 Aug;19(4):379-85 Chan YH, Chiang MF, Tsai YC, Su ST, Chen MH, Hou MS, Lin KI. 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MicroRNA 125b inhibition of B cell differentiation in germinal centers. Int Immunol. 2010 Jul;22(7):583-92 Hangaishi A, Kurokawa M. Blimp-1 is a tumor suppressor gene in lymphoid malignancies. Int J Hematol. 2010 Jan;91(1):46-53 Mandelbaum J, Bhagat G, Tang H, Mo T, Brahmachary M, Shen Q, Chadburn A, Rajewsky K, Tarakhovsky A, Pasqualucci L, Dalla-Favera R. BLIMP1 is a tumor suppressor gene frequently disrupted in activated B cell-like diffuse large B cell lymphoma. Cancer Cell. 2010 Dec 14;18(6):568-79 Montes-Moreno S, Gonzalez-Medina AR, Rodriguez-Pinilla SM, Maestre L, Sanchez-Verde L, Roncador G, Mollejo M, García JF, Menarguez J, Montalbán C, Ruiz-Marcellan MC, Conde E, Piris MA. Aggressive large B-cell lymphoma with plasma cell differentiation: immunohistochemical characterization of plasmablastic lymphoma and diffuse large PRDM1 (PR domain containing 1, with ZNF domain) B-cell lymphoma with partial plasmablastic Haematologica. 2010 Aug;95(8):1342-9 Tam W phenotype. Nie K, Zhang T, Allawi H, Gomez M, Liu Y, Chadburn A, Wang YL, Knowles DM, Tam W. Epigenetic down-regulation of the tumor suppressor gene PRDM1/Blimp-1 in diffuse large B cell lymphomas: a potential role of the microRNA let-7. Am J Pathol. 2010 Sep;177(3):1470-9 Sellheyer K, Krahl D. Blimp-1: a marker of terminal differentiation but not of sebocytic progenitor cells. J Cutan Pathol. 2010 Mar;37(3):362-70 Smith MA, Maurin M, Cho HI, Becknell B, Freud AG, Yu J, Wei S, Djeu J, Celis E, Caligiuri MA, Wright KL. PRDM1/Blimp-1 controls effector cytokine production in human NK cells. J Immunol. 2010 Nov 15;185(10):6058-67 Best T, Li D, Skol AD, Kirchhoff T, Jackson SA, Yasui Y, Bhatia S, Strong LC, Domchek SM, Nathanson KL, Olopade OI, Huang RS, Mack TM, Conti DV, Offit K, Cozen W, Robison Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2) 140 LL, Onel K. Variants at 6q21 implicate PRDM1 in the etiology of therapy-induced second malignancies after Hodgkin's lymphoma. Nat Med. 2011 Jul 24;17(8):941-3 Harper J, Mould A, Andrews RM, Bikoff EK, Robertson EJ. The transcriptional repressor Blimp1/Prdm1 regulates postnatal reprogramming of intestinal enterocytes. Proc Natl Acad Sci U S A. 2011 Jun 28;108(26):10585-90 Karube K, Nakagawa M, Tsuzuki S, Takeuchi I, Honma K, Nakashima Y, Shimizu N, Ko YH, Morishima Y, Ohshima K, Nakamura S, Seto M. Identification of FOXO3 and PRDM1 as tumor-suppressor gene candidates in NK-cell neoplasms by genomic and functional analyses. Blood. 2011 Sep 22;118(12):3195-204 This article should be referenced as such: Tam W. PRDM1 (PR domain containing 1, with ZNF domain). Atlas Genet Cytogenet Oncol Haematol. 2012; 16(2):135-140.