EVI1

Ecotropic viral integration site 1 is a human protein encoded by the EVI1 gene. EVI1 was first identified as a common retroviral integration site in AKXD murine myeloid tumors. It has since been identified in a plethora of other organisms, and seems to play a relatively conserved developmental role in embryogenesis. EVI1 is a nuclear transcription factor involved in many signaling pathways for both corepression and coactivation of cell cycle genes.

Gene structure

The EVI1 gene is located in the human genome on chromosome 3 (3q26.2). The gene spans 60 kilobases and encodes 16 exons, 10 of which are protein coding. The first in-frame ATG start codon is in exon 3. Metais, J., and Cynthia Dunbar. 2008. The MDS1-EVI1 gene complex as a retrovirus integration site: Impact on behavior of hematopoietic cells and implications for gene therapy. Molecular Therapy. 16:439-449 [http://www.ncbi.nlm.nih.gov/pubmed/18227842?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum PMID: 18227842] ]

mRNA

A large number of transcript variations exist, encoding different isoforms or chimeric proteins. Some of the most common ones are:

::EVI_1a, EVI_1b, EVI_1c, EVI_1d, and EVI_3L are all variants in the 5' untranslated region, and all except EVI_1a are specific to human cells Wieser, R. 2007. The oncogene and developmental regulator EVI1: Expression, biochemical properties, and biological functions. Gene. 396:346–357 [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T39-4NJ20BB-2&_user=1022551&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050484&_version=1&_urlVersion=0&_userid=1022551&md5=c35a728889d9b17e4ace50adb2f6d91a PMID: 17507183] ] .

::−Rp9 variant is quite common in human and mouse cells, lacks 9 amino acids in the repression domain .

::Δ324 found at low levels in human and mouse cells - an alternative splice variant encoding an 88kDa protein lacking zinc fingers 6 and 7

::Δ105 variant is unique to mice, and results in a protein truncated by 105 amino acids at the acidic C-terminus .

::Fusion transcripts with upstream genes such as MDS1/EVI1 (ME), AML1/MDS1/EVI1 (AME), ETV6/MDS1/EVI1 have all been identified

Protein

::Location: Nucleus, soluble or bound to DNA

::Size: 145kDa isoform most-studied, encoding 1051 amino acids , although there are many EVI1 fusion products detectable in cells expressing EVI1.

::Structure: 2 domain molecule characterized by 7 zinc finger motifs followed by a proline-rich transcription repression domain, 3 more zinc finger motifs and an acidic C-terminus.

::Role: Trancription factor

::Black boxes: Zinc finger motifs

::RD: proline-rich transcription repression domain

::ac: acidic region

::White boxes: other proteins known to interact with EVI-1 (See Signaling)

Biological role

EVI1 is a proto-oncogene conserved across humans, mice and rats, sharing 91% homology in nucleotide sequence and 94% homology in amino acid sequence between humans and mice Buonamici, S., Chakraborty, S., Senjuk, V., and Giuseppina Nucifora. 2003. The role of EVI1 in normal and leukemic cells. Blood Cells, Molecules, and Diseases. 31:206-212 [http://www.ncbi.nlm.nih.gov/pubmed/12972028?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum PMID: 12972028] ] . It is a transcription factor localized to the nucleus and binds DNA through specific conserved sequences of GACAAGATA Yatsula, B., Lin, S., Read, A., Poholek, A., Yates, K., Yue, D., Hui, P., and Archibald Perkins. 2005. Identification of binding sites of EVI1 in mammalian cells. J. Biol. Chem. 280:30712-30722 [http://www.ncbi.nlm.nih.gov/pubmed/16006653?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum PMID: 16006653] ] with the potential to interact with both corepressors and coactivators.

Embryogenesis:The role of EVI1 in embryogenesis and development is not completely understood, but it has been shown that EVI1 deficiency in mice is an embryonic lethal mutation, characterized primarily by widespread hypocellularity and poor/disrupted development of the cardiovascular and neural system . EVI1 is highly expressed in the murine embryo, found in the urinary system, lungs, and heart, but is only minutely detectable in most adult tissues , indicating a likely role in tissue development. EVI1 and the fusion transcript MDS1-EVI1 are both expressed in the adult human kidney, lung, pancreas, brain and ovaries .

Cell cycle and differentiation:"In vitro" experiments using both human and mouse cell lines have shown that EVI1 prevents the terminal differentiation of bone marrow progenitor cells to granulocytes and erythroid cells, however it favors the differentiation of hematopoietic cell to megakaryocytes . The chimeric gene of AML1-MDS1-EVI1 (AME) formed by the chromosomal translocation (3;21)(q26;q22) has also been shown "in vitro" to upregulate the cell cycle and block granulocytic differentiation of murine hematopoietic cells, as well as to delay the myeloid differentiation of bone marrow progenitors .

Association with cancer

EVI1 has been described as a proto-oncogene since its first discovery in 1988 [ Morishita K., Parker D., Mucenski M., Jenkins N., Copeland N., and J. Ihle. 1988. Retroviral activation of a novel gene encoding a zinc finger protein in IL-3-dependent myeloid leukemia cell lines. Cell. 54:831–840 [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WSN-4DFBMHF-F&_user=1022551&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050484&_version=1&_urlVersion=0&_userid=1022551&md5=e2f623ac5919ff4bc5b7052de5d6405f PMID: 2842066] ] . Overexpression and aberrant expression of EVI1 has been associated with human acute myelogenous leukemia (AML), myelodysplastic syndrome (MDS) and chronic myelogenous leukemia (CML), and more recently has been shown as a poor prognostic indicator. All of these involve erratic cellular development and differentiation in the bone marrow leading to dramatic alterations in the normal population of blood cells. EVI1 has also been found to play a role in solid ovarian and colon tumors Shackelford, D., Kenific, C., Blusztajn, A., Waxman, S., and Ruibao Ren. 2006. Targeted degradation of the AML1/MDS1/EVI1 oncoprotein by arsenic trioxide. Cancer Research. 66:11360-11369 [http://cancerres.aacrjournals.org/cgi/content/full/66/23/11360 PMID: 17145882] ] , although it is not yet well characterized in this context. It has been hypothesized that it acts as a survival factor in tumor cell lines, preventing therapeutic-induced apoptosis and rendering the tumor cells more resistant to current treatments [ Liu, Y., Chen L., Ko, T., Fields, A., and E. Thompson. 2006. Evi1 is a survival factor which conveys resistance to both TGF-beta and taxol-mediated cell death via PI3K/AKT. Oncogene. 25: 3565–3575 ] .

Role in tumor suppressor signaling and prevention of apoptosis

* TGF-β AND CELL CYCLE PROGRESSION

EVI1 has been shown to be involved in the downstream signaling pathway of transforming growth factor beta (TGF-β). TGF-β, along with other TGF-β family ligands such as bone morphogenic protein (BMP) and activin are involved in regulating important cellular functions such as proliferation, differentiation, apoptosis, and matrix production Alliston, T., Ko, T., Cao, Y., Liang, Y., Feng, X., Chang, C., and Rik Derynck. 2005. Repression of bone morphogenetic protein and activin-inducible transcription by Evi-1. The Journal of Biological Chemistry. 280: 24227-24237 [http://www.jbc.org/cgi/content/full/280/25/24227 PMID: 15849193] ] . These biological roles are not only important for cellular development, but also in understanding oncogenesis.

TGF-β signaling induces transcription of the cyclin-dependent kinase (CDK) inhibitors p15^Ink4B or p21^Cip1, which consequently act to halt the cell cycle and stop proliferation. This inhibition can lead to cellular differentiation or apoptosis, and therefore any resistance to TGF-β is thought to contribute in some way to human leukemogenesis Izutsu, K., Kurokawa, M., Imai, Y., Maki, K., Mitani, K., and Hisamaru Hirai. 2001. The corepressor CtBP interact with Evi-1 to repress transforming growth factor β signaling. Blood. 97:2815-2822 [http://bloodjournal.hematologylibrary.org/cgi/content/full/97/9/2815 PMID: 11313276] ] . As shown in the figure below, the downstream effectors of TGF-β are the Smad receptors (also known as receptor-activated Smads). Smad2 and Smad3 are phosphorylated in response to TGF-β ligand binding, and translocate into the nucleus of the cell where they can then bind to DNA and other transcription factors . Stable binding to promoters occurs through a conserved MH1 domain and transcription activation occurs through an MH2 domain, and involves accompanying coactivators such as CBP/p300 and Sp1 .

The majority of literature discusses the interaction between EVI1 and Smad3, however there have been some experiments done showing that EVI1 interacts with all of the Smad proteins at varying levels, indicating a potential involvement in all of the pathways that include Smads as downstream effectors . The translocation of phosphorylated Smad3 into the nucleus allows for direct interaction with EVI1, mediated by the first zinc finger domain on EVI1 and the MH2 domain on Smad3 . As the Smad3 MH2 domain is required for transcription activation, EVI1 binding effectively prevents transcription of the TGF-β induced anti-growth genes through structural blocking, and also leads to recruitment of other transcriptional repressors (see Epigenetics). By inhibiting an important checkpoint pathway for tumor suppression and growth control, overexpression or aberrant expression of EVI1 has characteristic oncogenic activity.

As an additional confirmation of the role of EVI1 expression on cell cycle progression, it has been shown that high EVI1 expression is correlated with the well-known tumor suppressor and cell cycle mediator Retinoblastoma remaining in a hyperphosphorylated state, even in the presence of TGF-β Hirai, H., Izutsu, K., Kurokawa, M., and Kinuko Mitani. 2001. Oncogenic mechanisms of Evi-1 protein. Cancer Chemother Pharmacol. 48:S35-S40 [http://www.ncbi.nlm.nih.gov/pubmed/11587364?ordinalpos=2&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum PMID: 11587364] ] .
* JNK AND INHIBITION OF APOPTOSIS

c-Jun N-terminal kinase (JNK) is a MAP kinase activated by extracellular stress signals such as gamma-radiation, ultraviolet light, Fas ligand, tumor necrosis factor α (TNF-α), and interleukin-1 KuroKawa, M., Mitani, K., Yamagata, T., Takahashi, T., Izutsu, K., Ogawa, S., Moriguchi, T., Nishida, E., Yazaki, Y., and Hisamuru Hira. 2000. The Evi-1 oncoprotein inhibits c-Jun N-terminal kinase and prevents stress-induced cell death. EMBO. 19:2958-2968 [http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=10856240 PMID: 10856240] ] . Phosphorylation on two separate residues, Thr183 and Tyr185, cause JNK to become activated and translocate to the nucleus to phosphorylate and activate key transcription factors for the apoptotic response .

Experiments co-expressing EVI1 and JNK have shown that levels of JNK-phosphorylated transcription factors (such as c-Jun) are drastically decreased in the presence of EVI1. Binding of EVI1 and JNK has been shown to occur through the first zinc finger motif on EVI1, and that this interaction does not block JNK phosphorylation and activation, but blocks JNK binding to substrate in the nucleus. Subsequent "in vitro" assays showed that stress-induced cell death from a variety of stimuli is significantly inhibited by EVI1 and JNK binding .

Interestingly, EVI1 does not bind other MAP kinases such as p38 or ERK .

Oncogenesis and induced proliferation of HSCs

Among the many other observed defects, EVI1^-/- mouse embryos have been shown to have defects in both the development and proliferation of hematopoietic stem cells (HSCs). This is likely due to direct interaction with the trancription factor GATA-2, which is crucial for HSC development Yuasa, H., Oike, Y., Iwama, A., Nishikata, I., Sugiyama, D., Perkins, A., Mucenski, M., Suda, T., and Kazuhiro Morishita. 2005. Oncogenic transcription factor Evi1 regulates hematopoietic stem cell proliferation through GATA-2 expression. EMBO Journal. 24:1976-1987 [http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=15889140 PMID: 15889140] ] . It has subsequently been shown many times "in vitro" that EVI1 upregulation can induce proliferation and differentiation of HSCs and some other cell types such as rat fibroblasts .

It should be noted, however, that existing data is inconclusive regarding the absolute role of EVI1 in cell cycle progression. It appears to depend on the specific cell type, cell line and growth conditions being used whether EVI1 expression induces growth arrest, cell differentiation/proliferation, or has no effect at all . The data showing direct interaction of EVI1 with the promoters for a diverse array of genes supports the theory that this is a complex transcription factor associated with many different signalling pathways involved in development and growth.

Angiogenesis

Although the literature is limited on the subject, the well-documented effects on HSCs imply that there is a potential indirect effect of aberrant EVI1 expression on tumoral angiogenesis. HSCs secrete angiopoietin, and its receptor molecule Tie2 has been implicated in angiogenesis of tumors in both humans and mice De Palma, M., Murdoch, C., Venneri, M., Naldini, L, and Claire Lewis. 2007. Tie2-expressing monocytes: regulation of tumor angiogenesis and therapeutic implications. Trends in Immunology. 28:545-550. [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W7H-4R2GX3G-3&_user=1022551&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050484&_version=1&_urlVersion=0&_userid=1022551&md5=1d0ad0199bbbd2a02da63888834e3c42 PMID: 17981504] ] . Upregulation of Tie2 has been shown to occur under hypoxic conditions, and to increase angiogenesis when coinjected with tumor cells in mice . Observations that EVI1^-/- mutants have substantially downregulated Tie2 and Ang-I expression therefore hints at an interesting role of high EVI1 expression in tumor progression. This is likely, at least in part, a reason for the widespread hemorrhaging and minimal vascular development in EVI1 deleted embryos , and potentially indicates yet another reason for poor prognosis of EVI1 positive cancers.

Epigenetics

EVI1 has also been shown to directly interact with C-terminal binding protein (CtBP, a known transcriptional repressor) through "in vitro" techniques such as yeast 2-hybrid screens and immunoprecipitation . This interaction has been specifically shown to rely on amino acids 544-607 on the EVI1 protein, a stretch which contains two CtBP binding consensus motifs . This binding leads to recruitment of histone deacetylases (HDACs) as well as many other corepressor molecules leading to transcription repression via chromatin remodelling .

Interestingly enough, EVI1 interaction with Smad3 followed by recruitment of corepressors can inhibit transcription and de-sensitize a cell to TGF-β signaling without ever displacing Smad3 from a gene's promoter . The epigenetic modification is clearly enough to make the DNA inaccessible to the transcription machinery.

It should be noted that although EVI1 has mainly been implicated as a transcription repressor, there is some data that has shown a possible dual role for this protein. Studies show that EVI1 also binds to known coactivators cAMP responsive element binding protein (CBP) and p300/CBP-associated factor (P/CAF). These both lead have histone acetyltransferase activity, and lead to subsequent transcription activation. Additionally, structural changes have been visualized within the nucleus of a cell depending on the presence of corepressors or coactivators, leading researchers to believe that EVI1 has a unique response to each kind of molecule. In approximately 90% of cells, EVI1 is diffuse within the nucleus, however when CBP and P/CAF are added extensive nuclear speckle formation occurs Chakraborty, S., Senyuk, V., Sitailo, S., Chi, Y., and G. Nucifora. 2001. Interaction of EVI1 with cAMP-responsive element-binding protein-binding protein (CBP) and p300/CBP-associated factor (P/CAF) results in reversible acetylation of EVI1 and in co-localization in nuclear speckles. J Biol Chem. 276:44936-44943 [http://www.jbc.org/cgi/content/full/276/48/44936 PMID: 11568182] ] . The complete physiological repercussions of this complex role of EVI1 have yet to be elucidated, however could provide insight into the wide variety of results that have been reported regarding the effect of EVI1 on "in vitro" cell proliferation .

Interaction with corepressors and coactivators appears to occur in distinct domains and there are theories that EVI1 exists in a periodical, reversible acetylated state within the cell. Contrasting theories indicate that the interplay between different EVI1 binding proteins acts to stabilize interactions with different transcription factors and DNA leading to a response of EVI1 to a diverse set of stimuli.

Chromosome instability

Since it was first identified in murine myeloid leukemia as a common site of retroviral integration into the chromosome, EVI1 and its surrounding DNA have been a site of many identified chromosomal translocations and abnormalities Morishita, K., Parganas, E., William, C., Whittaker, M., Drabkin, H., Oval, J., Taetle, R., Valentine, M., and J. Ihle. 1992. Activation of EVI1 gene expression in human acute myelogenous leukemias by translocations spanning 300-400 kilobases on chromosome band 3q26. Proceedings of the National Academy of Sciences. 89:3937-3941 [http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=1570317 PMID: 1570317] ] . This can lead to aberrant expression of EVI1, and as shown in the figure below, commonly involved chromosomal breakpoints have been mapped extensively. One major cause of EVI1 activation and consequent overexpression is a clinical condition called 3q21q26 syndrome from inv(3)(q21q26) or t(3;3)(q21;q26) . The result is the placement of a strong enhancing region for the housekeeping gene [http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=6184&ordinalpos=2&itool=EntrezSystem2.PEntrez.Gene.Gene_ResultsPanel.Gene_RVDocSum Ribophorin I] next to the EVI1 coding sequence, resulting in a dramatic increase of EVI1 levels in the cell .

A summary of common chromosomal abnormalities involving EVI1 and its fusion genes can be found in a review by Nucifora "et al" Nucifora, G., Lariccia-Robbio, L., and Vitalyi Senyuk. 2006. EVI1 and hematopoietic disorders: History and perspectives. Gene. 368:1-11 [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T39-4HNSG5Y-4&_user=1022551&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050484&_version=1&_urlVersion=0&_userid=1022551&md5=29cfa2e3bb727507bb61b2157122072a PMID: 16314052] ] .

Most commonly, chromosomal translocations in human AML or MDS leads to constitutive expression of EVI1 and eventually to cancer . These abnormalities in the 3q26 region are not only associated with very poor patient prognosis, they are also commonly accompanied by additional karyotypic changes such as chromosome 7 monosomy, deletion of the short arm of chromosome 7, or partial deletions of chromosome 5 Barjesteh, S., Erpelinck, C., van Putten, W., Valk, P., van der Poel-van de Luytgaarde, S., Hack, R., Slater, R., Smit, E., Beverloo, H., Verhoef, G., Verdonck, L., Ossenkoppele, G., Sonneveld, P., de Greef, G., Lowenberg, B., and R. Delwel. 2003. High EVI1 expression predicts poor survival in acute myeloid leukemia: a study of 319 de novo AML patients. Blood. 101:837-845 [http://bloodjournal.hematologylibrary.org/cgi/content/full/101/3/837 PMID: 12393383] ] . In addition, it has been shown that development of acute myelogenous leukemia is likely due to several sequential genetic changes, and that expression of EVI1 or its chimeric counterparts ME and AME alone is not enough to completely block myeloid differentiation Cuenco, G., and Ruibao Ren. 2001. Cooperation of BCR-ABL and AML1/MDS1/EVI1 in blocking myeloid differention and rapid induction of an acute myelogenous leukemia. Oncogene. 20:8236-8248 [http://www.nature.com/onc/journal/v20/n57/abs/1205095a.html;jsessionid=18290A51EA7AE390248EA2C759E6113B PMID: 11781838] ] . BCR-Abl, a fusion gene caused by t(9;22)(q34;q11)is thought to have a cooperative effect with EVI1 during the progression of AML and CML . Together, these two systems disrupt tyrosine kinase signaling and hematopoietic gene transcription.

Despite the extensively studied chromosomal abnormalities at the EVI1 locus, it should be noted that in anywhere from 10-50% of identified cases, EVI1 overexpression is detectable without any chromosomal abnormalities; indicating that there are other not yet understood systems, likely epigenetic, leading to EVI1 promoter activation . In many of these cases, it is noted that a variety of 5' transcript variants are detectable at relatively high levels. Clinical studies have shown that these variants (EVI1_1a, EVI1_1b, EVI1_1d, EVI1_3L) as well as the MDS1-EVI1 fusion transcript are all associated with poor prognosis and increased likelihood of rapid remission in cases of "de novo" AML [ Haas K., Kundi M., Sperr W., Esterbauer H., Ludwig W., Ratei R., Koller E., Gruener H., Sauerland C., Fonatsch C., Valent P., and R. Wieser. 2008. Expression and prognostic significance of different mRNA 5'-end variants of the oncogene EVI1 in 266 patients with de novo AML: EVI1 and MDS1/EVI1 overexpression both predict short remission duration. Genes Chromosomes Cancer. 47:288-98 [http://www.ncbi.nlm.nih.gov/pubmed/18181178?ordinalpos=3&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum PMID: 18181178] ] .

Pharmacogenomics and cancer treatment

Very little research has been done in an attempt to therapeutically target EVI1 or any of its chimeric counterparts. However, since it has become an established fact that overexpression of EVI1 derivatives is a bad prognostic indicator, it is likely that the literature will begin to examine specific targeting within the next few years.

One very promising therapeutic agent for myelogenous leukemia and potentially other forms of cancer is arsenic trioxide (ATO). One study has been done showing that ATO treatment leads to specific degradation of the AML1/MDS1/EVI1 oncoprotein and induces both apoptosis and differentiation . As an atypical use of traditional pharmacogenomics, this knowledge may lead to an increased ability to treat EVI1 positive leukemias that would normally have poor prognoses. If it is established that a clinical cancer case is EVI1 positive, altering the chemotherapeutic cocktail to include a specific EVI1 antagonist may aid to increase life span and prevent potential remission. Arsenic is a fairly ancient human therapeutic , however it has only recently returned to the forefront of cancer treatment. It has been observed that it not only induces apoptosis, but can also inhibit the cell cycle, and has marked anti-angiogenesis effects Hu, J., Fang, J., Dong, Y., Chen, S., and Z. Chen. 2005. Arsenic in cancer therapy. Anticancer Drugs. 16:119-127 [http://www.ncbi.nlm.nih.gov/pubmed/15655408 PMID: 15655408] ] . As of 2006, Phase I and II clinical trials were being conducted to test this compound on a wide variety of cancer types, and currently (2008) a number of publications are showing positive outcomes in individual case studies, both pediatric and adult.

Hormones

The important and essential role of EVI1 in embryogenesis clearly indicates a close association with hormonal fluctuations in developing cells. However, to date, the presence of EVI1 in cancer has not been linked to aberrant production of any hormones or hormone receptors. It is likely that EVI1 is far enough downstream of hormonal signaling that once overproduced, it can function independently.

Future and current research

More in-depth investigations into the biological role of EVI1 in development are required, as well as further characterizing the mode(s) of activation of this gene in cancer cells. Once the knowledge base is more developed, it is likely that screening for specific EVI1 antagonists or inhibitors will become more feasible, and improve the current treatment regime for patients.

Areas where retroviral integration into the human genome is favored such as EVI1 have very important implications for the development of gene therapy. It was initially thought that delivery of genetic material through a non-replicating virus vector would pose no significant risk, as the likelihood of a random incorporation near a proto-oncogene was minimal. However, it has now been shown that sites such as EVI1 are "highly over-represented" when it comes to vector insertions . With gene therapy gradually becoming a more popular idea, large studies must be conducted to understand the dynamic of why vector integration occurs where it does, and what factors influence the 'non-randomness' of the process.

References

Further reading

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