A Systematic Review of the Role of Runt-Related Transcription Factor 1 (RUNX1) in the Pathogenesis of Hematological Malignancies in Patients With…
By daniellenierenberg
Therunt-related transcription factor 1 (RUNX1) gene is known as a critical regulator of embryogenesis and definitive hematopoiesis in vertebrates, playing a vital role in the generation of hematopoietic stem cells (HSCs) and their differentiation into the myeloid and lymphoid lineage. The discovery of RUNX1 mutationsas the cause of familial platelet disorder (FPD) was pivotal to understanding the implications of this gene in hematological malignancies.FPD is an inherited bone marrow failure syndrome (IBMFS) with quantitative and qualitative platelet abnormalities and a highpredisposition to acute myeloid leukemia (AML)[1,2].IBMFS are genetic disorders characterized by cytopenia and hypoproliferation of one or more cell lineages in the bone marrow[1]. The production of blood cells (erythrocytes, granulocytes, and platelets) is compromised because of the mono-allelic gene mutation in one of certain bone marrow genes. Besides FPD, the other most common IBMFSs include Fanconi anemia (FA), Diamond-Blackfan anemia (DBA), Shwachman-Diamond syndrome (SDS), and severe congenital neutropenia (SCN)[3]. Patients with IBMFSs show a predisposition to developinghematological complications, such as myelodysplastic syndrome (MDS) or AML[3]. MDS is a pre-leukemic state defined by the presence of refractory cytopenia or refractory cytopenia with an excess of blasts (5-29%) in the bone marrow. AML is a blood cancer that is characterized by rapid leukemic blast cell growth and the presence of more than 30% myeloid blasts in the bone marrow[2].
Recent studies have shown that RUNX1 germline mutations in patients with IBMFS arelikeacquiredorsomatic RUNX1 mutations that were found in myeloid malignancies, particularly in MDS and AML[3].It has become clear that somatic RUNX1 mutations are more prevalent in MDS/AML that is secondary to IBMFS, such as FA and SCN. Unlike acquired MDS/AML, these forms of secondary MDS/AML are often refractory to treatment,resulting ina poor prognosis. Because the somatic mutation of RUNX1 was first identified in MDS and AML, RUNX1 has become known to be one of the most frequently mutated genes in a variety of hematologicalmalignancies[4].
Despite recent research having demonstrated the strong association of RUNX1 mutations in a variety of hematological malignancies, it is unclear howRUNX1 mutations contributetothepathogenesis of hematological malignancies in IBMFS. What are the frequencies of different RUNX1 mutations in various subgroups of hematological malignancies, as well as their impact on prognosis? Furthermore, is there any potential for the developmentof new cancer therapies following recent findings regarding the role of RUNX1 in the malignanttransformation[5]?
In this article, we summarize new research onthe role of RUNX1 mutations, published in February 2020 by three different groups[6-8].They performed different experiments in human, mouse, and induced pluripotent stem cell (iPSC) models to decipher the role of the RUNX1 gene in the malignant transformation of IBMFS; the mechanisms of pathogenesis; clinical and molecular characteristics of RUNX1 mutations; and the potential for the treatmentof cancers. The mouse and iPSC models suggested that secondary RUNX1 mutations in clones with granulocyte colony-stimulating factor 3 receptor (GCSF3R) mutations are weakly leukemogenic and that an additional clonal mutation in theCXXC finger protein 4 (CXXC4) gene is required for the full transformation to AML[9].Mutations in the CXXC4 gene lead to the hyperproduction of inflammatory proteins called theten-eleven translocation (TET2) proteins.This inflammation, in combination with the RUNX1 mutations, drives the development of myeloid malignancies[10].The other pathogenic mechanisms wherein RUNX1 mutations may initiate tumor cellproliferation 18arethe inhibition of the p53 pathway and hypermethylation of the promoter of Wingless and Int1 (WNT) inhibitor gene called secreted frizzled-related protein 2 (SFRP2)[11,12].
These discoveries may have the potential to aidthe development of new therapeutic strategies.Specifically, immunotherapy may be employed for suppression of the excessive immune response to hyperproduction of TET2 proteins.The other potential therapeutics, such as mouse double minute 2 (MDM2) andpoly adenosine diphosphate-ribose polymerase(PARP) inhibitors, may be used to inhibit the hyperactivation of the p53 pathway or hypersensitivity to DNA damage resulting from RUNX1 mutations[11]. Because the presence of RUNX1 mutation represents a poor prognostic factor in patients with MDS or AML, the investigation of various biomarkers is critical as they may detect the clones with RUNX1 mutation, in the early stages of leukemic progression[7].
Search Strategy
The PubMed online database search was used to select the articles which are included in this review. The findings were reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The following medical subject heading (MeSH) parameters were used: inherited and bone marrow and failure and syndromes. This search resulted in 5,051 articles.
Selection Criteria
The identified articles were further filtered. Thereview selectedonly articles that met the following criteria: (1) papers published between January and December 2020; (2) free full-text available; (3) papers written in English; and (4) studies conducted on human participants. Among screened articles, only clinical trials, meta-analyses, randomized controlled trials, and systematic reviews were included. Five citations from other sources were not included because they were not relevant to the topic. To further select the articles, we included the following MeSH terms: hematologic neoplasms, gene expression regulation, leukemic, RUNX1 protein, human, and Neutropenia, Severe Congenital, Autosomal recessive. Any articles that were not relevant to the role of the RUNX1 gene were excluded. These criteria allowcomparison between articles; however, it should be noted that differing lab protocols between studies prevents validation of results using the same assessment tool. A systematic search review is reported using the PRISMA 2020 guidelines [13].The diagram is presented in Figure1.
The selected articles were used to evaluate the clinical and molecular characteristics of RUNX1 mutation in various types of hematological malignancies, the mechanisms of pathogenesis caused by RUNX1 mutations, and potential therapeutic strategies for hematological malignancies with RUNX1 mutations.
Clinical and Molecular Characteristics of RUNX1 Mutation in Hematological Malignancies
RUNX1 gene has multiple biological functions in the human body. It regulates hematopoiesis, the cell cycle and genome stability, the p53 signaling pathway, apoptosis, and ribosomal biogenesis. During hematopoiesis, this gene controls the development of HSCs and their differentiation in different lineages. The transition from the G1-S to the G2/M phase of the cell cycle is facilitated by RUNX1. This gene controls cellular proliferation and differentiation via direct regulation of transcription, achieved by binding promoters of the genes that are encoding ribosomal RNA/proteins. According to recently published data, somatic mutations of RUNX1 were observed in various types of hematological malignancies. We present the frequency of RUNX1 mutations in various types of hematological malignancies in Table 1 below.
Most frequently, somatic mutations of RUNX1 were associated with the development of myeloproliferative neoplasm (MPN) (10.3-37.5%) and chronic myelomonocytic leukemia (CMML) (32.1-37%). Despite this, the association between RUNX1 somatic mutations and MDS was only 10%.
The Mechanisms of Pathogenesis Caused by RUNX1 Mutations
In the selected studies, the different mechanisms of pathogenesis caused by RUNX1 mutations were characterized. It has been shown that loss of RUNX1 function causes inhibition of differentiation of HSCs. Therefore, in pre-leukemia, we found expansion of HSCs and progenitor cells. RUNX1 mutations may attenuate the G1-S phase and enhance the proliferation of hematopoietic cells that occur during the mitotic phase of the cell cycle (G2/M) [7]. The mutations can also result in genomic instability, leading to increased DNA damage and impaired DNA repair. Some mutations in RUNX1 are associated with alterations of signaling pathways, such as WNT and p53. Hypermethylation of the WNT inhibitor gene promoter, SFRP2, can lead to aberrant activation of the WNT signaling pathway and leukemogenesis in AML. When functioning normally, the RUNX1 gene acts to increase transcriptional activity of the p53 signaling pathway, in response to DNA damage caused by exposure to different agents such as chemicals, radiation, and toxins. Mutations in RUNX1 may lead to defects in p53-mediated apoptosis/DNA repair/cell cycle regulation resulting in tumorigenesis. Furthermore, loss-of-function mutations of RUNX1 may aid tumor-initiating cells in hematological malignancies via inhibition of p53 signaling and apoptosis, among other mechanisms. Such mutations have reduced ribosomal biogenesis in HSCs and directed to malignant proliferative processes in the pre-leukemic stage [6]. In vivo studies, administration of amino acid L-leucine to patients with DBA resulted in loss-of-function mutations in ribosomal protein genes. Research into iPSC confirmed that the introduction of the mutated RUNX1 gene into CD34+CD45+ cells via lentivirus can stimulate receptor which binds the granulocyte colony-stimulating factor 3 receptor (GCSF3R) and initiates the production of immature cells. The percentage of immature cells was significantly increased when compared to the percentage in empty vector (ev) control studies. The myeloid differentiation of GCSF3R-d715/RUNX1-D171N and GCSF3R-d715/ev cells without RUNX1-D171N lentiviral expression vector or with an ev is presented in Figure 2.
Potential Therapeutic Strategies for RUNX1-Mutated Cases of Hematological Malignancies
Clinical trials demonstrated potential therapeutic strategies for RUNX1 mutated hematologic malignancies.Based on the current RUNX1 roles in human hematopoiesis, various therapeutic options were developed. Thus far, the different DNA repair inhibitors can be useful in the M phase of cell cycle repair or bypassing the cells with damage because RUNX1 mutations lead to DNA damage and impaired DNA repair[32].In addition, adriamycin as an antineoplastic drug can stimulate the RUNX1-p53 complex which is important in the activation of p53-mediated apoptosis[11].L-leucine can be used to improve anemia in the genetic DBA mouse models and DBA patients. This agent is a potent stimulator of protein translation that is initialized by the activation of the mammalian target of rapamycin (mTOR) protein kinase. This kinase stimulates protein synthesis[33].Another agent, clustered regulatory interspaced short palindromic repeats-associated genes (CRISPR-Cas) can be used as a genomic targeted treatment as this agent can edit the RUNX1 gene by cutting pieces of DNA where RUNX1 mutations are, followed by stimulating natural DNArepair[6].Finally, hypoxia-inducible factor 1 (HIF-1) inhibitor can potentially treat various hematological malignancies as a modulator of cell metabolism. MDS and other hematological malignancies are in hypoxia-like status and produce their energy through the tricarboxylic acid (TCA) cycle. The use of HIF-1 inhibitor can suppress the TCA cycle and modulate it into an aerobic metabolic pathway called glycolysis through which the normal cells are supplied with energy. The recent studies proposed therapeutic strategies that employed the different pathophysiological mechanisms to correct the RUNX1 mutations, as shown in Figure3.
The RUNX1 gene plays essential roles in a wide range of biological processes, including the development of HSCs, cell proliferation,megakaryocyte maturation, T lymphocyte-lineage differentiation,and apoptosis. It is not surprising that RUNX1 dysfunction is associated with the development of IBMFSs and various hematological malignancies[7,21,34].
Previous studies have shown that RUNX1 is one of the most frequently mutated genes in hematologicalmalignancies. RUNX1mutations account for about 10-15% of all somatic mutations that have been detected in MDS[21,35].The incidence of RUNX1 mutations in CMML and chronic myelogenous leukemia (CML) is even higher, ranging from 32.1% to 37%, respectively[36].RUNX1 mutations have also been reported in 14% of patients withMPN,15.6% of patients with acute lymphoblastic leukemia (ALL),and 10.3-37.5% of AML patients. Importantly, these studies have shown that mutated RUNX1can be used as an independent prognostic factor for event-freesurvival (EFS), relapse-free survival (RFS), or overall survival (OS) in hematological malignancies[37].Therefore, AML patients with RUNX1 mutations had worse prognosis, resistance to chemotherapy, and inferior EFS,RFS, and OS. Reduced OS was also observed in high-risk MDS patients with RUNX1mutations who had poor clinical outcomes and shorter latency for progression to secondary AML[38,39].
Little is known about the role of the RUNX1 gene in the development of secondary somatic mutations in patients with IBMFSs and how these mutations lead to hematological malignancies. The data have shown that individuals with IBMFSs, such as FPD and FA, have a high lifetime risk (30-44%) of developing MDS and AML [29,30]. Among FA-associated MDS or MDS/AML patients, RUNX1 mutations were detected in the range from 20.7% to 31.25%, respectively. In SCN-MDS/AML patients RUNX1 mutations were seen at the highest rate of up to 64.5% which revealed that these types of mutations are the most frequent somatic secondary mutations in SCN-MDS/AML [31,40,41]. Given that the patients with SCN are more prone to develop somatic RUNX1 mutations, SCN/AML has been recognized as an important model to further investigate the role of secondary RUNX1 mutations in the molecular pathogenesis of hematological malignancies. SCN is an IBMFS classified by severe neutropenia and life-threatening infections such as fungal infections or bacterial sepsis [40]. The most frequent mutated gene is encoding neutrophil elastase (ELANE). The treatment consists of life-long administration of GCSF3 that successfully alleviates the neutrophil counts [42]. As is common with other forms of IBMFSs, SCN patients have a high risk of developing MDS or AML. The incidence of developing MDS or AML directly correlates to the number of years on GCSF3. Therefore, after 15 years on GCSF3, the incidence of developing MDS or AML is 21% [31]. The majority of SCN patients with leukemic progression develop hematopoietic clones with somatic mutations in GCSF3R, resulting in a truncated form of GCSF3R [42]. It is important to note that these clones can persist for several months or years before MDS or AML becomes symptomatic, raising the question of how these GCSF3R mutants contribute to the malignant transformation of SCN [31,41]. Given this, a mouse model was used to study the role of RUNX1. In this study, a truncated GCSF3R (GCSF3R-D715) identical to the mutant GCSF3R form in SCN patients was expressed in mice [43]. In addition, a lentiviral expression vector was used to express RUNX1-mutant D171N in conjunction with an enhanced green fluorescent protein (eGFP) [8]. The mouse bone marrow (BM) cells with expressed GCSF3R-D715 mutation were subsequently serially transplanted into wild-type recipients. Before transplantation, the recipients were treated either three times per week with GCSF3 or with peripheral blood solvent (PBS) control. Primary recipients who were treated with GCSF3 and transplanted with GCSFR3-RUNX1-mutant BM cells developed myeloblasts in peripheral blood (PB) that were sustained for at least 30 weeks. None of these mice developed symptoms of AML, suggesting that the elevated myeloblasts in the PB reflected a pre-leukemic state rather than a fully transformed state. However, upon transplantation in secondary and tertiary recipients, mice developed GCSF3R-RUNX1-mutant AML. Whole-exome sequencing (WES) was performed on lin-c-kit (LK) cells and revealed that AML cells from the secondary and tertiary recipients had seven-fold higher expressions of CXXC4 mutations than the cells from the primary recipient. Recently, CXXC4 mutations have also been detected in human AML cases [9]. It seems that CXXC4 mutations enhance the production of TET2 protein which is known to be an inflammatory factor and has a similar role to interferon-gamma, interleukin-6, and others. Interferon-gamma and interleukin-6 are cytokines that are produced in response to infections and tissue damage, with pro- and anti-inflammatory effects. Hyperproduction of TET2 leads to inflammatory processes that may play an important role in the development of myeloid malignancy involving RUNX1 mutations [10]. In conclusion, isolated RUNX-Runt homology domain (RHD) mutations are only weakly leukemogenic and an additional clonal mutation that reduces levels of TET2 is what drives the full transformation to AML [8,32]. The data suggest the need for further investigation into the somatic RUNX1 mutations in HSPCs that already harbour a GCSF3R nonsense mutation. To achieve this, a CRISPR/Cas9-based strategy was used to introduce a patient-derived GCSF3R nonsense mutation into iPSC. CRISPR-Cas9 is a technology used for removing, adding, or altering sections of the DNA. After culturing iPSC, CD34+CD45+ cells were transduced using a lentivirus to express the RUNX1-RHD D171N mutant. The experiments confirm that the combinations of GCSF3R and RUNX1 mutations have a moderate effect on myeloid differentiation and result in an increasing number of myeloblasts. These findings corroborate the findings in the mouse model and suggest that secondary RUNX1 mutations in clones with GCSF3R mutations are not sufficient to fully transform to AML.
Most of the RUNX1 mutations are mono-allelic, such as in FPD, an IBMFS resulting in apredisposition to leukemia[1,2]. Germline RUNX1 mutations are dominant-negative mutations and correlate toa higher risk of developing hematological malignancies compared to RUNX1 loss-of-function mutations[5-8].It is important to note, however, that such germline mutations alone are not sufficient for the development of leukemia and additional mutations in RUNX1 (bi-allelicmutations)or epigenetic modifiers, splicing factors, or tumor suppressors are required to induce myeloid malignancies[1,4].
It has been observed that mutations in RUNX1 are associated with alterations of p53 and other signaling pathways, such as WNT, bone morphogenetic proteins (BMP), transforming growth factor-beta (TGF-), rat sarcoma-the extracellular signal-regulated kinase (RAS-ERK), Hippo-yes-1-associated protein (YAP1), and Notch.Unlike mono-allelic mutations, loss-of-function mutations of RUNX1 are responsible for initiating tumor cell proliferation by inhibiting the p53 signaling pathway and apoptosis.Thep53 pathway is activated in DNA damage and is responsible for DNA repair.RUNX1 increases the transcriptional activity of p53, potentially via up-regulation of p300-mediated acetylation of p53. RUNX1 mutations lead to a reduction of p53-mediated apoptosis[11].The WNT pathway is important for cellular proliferation and differentiation, with aberrant activation of this pathway being reported in various tumors. RUNX1 mutations were closely associated with hypermethylation of the promoter of one of the WNT inhibitor genes (SFRP2) in AML. It was suggested that the WNT inhibitor hypermethylation might lead to aberrant activation of the WNT signaling pathway. It is suggested that mutation in the RUNX1 gene can interact with the SFRP2 gene which is known as an inhibitor gene responsible for the suppression of the WNT signaling pathway. Due to interaction with genetic alterations, the hypermethylation of SFRP2 gene promoter is initiated and leads to leukemogenesis where cellular proliferation and differentiation are uncontrolled[12].
This review has highlighted the importance of studying the role of somatic RUNX1 mutations in the pathogenesis of hematological malignancies and the potential implications in the development of oncological therapies. This review does, however, had some limitations.First,the results presented in this review were collected from only three articles that were published over the limited time frame of one year. In addition, we included only articles that were available in the PubMed database and in both free text format and English language. This review did not apply the same assessment tools such as the lab protocols for conducting experiments. Variations between lab protocols did not allow the comparison of study results. In all the articles included, the scope of the study was the role of RUNX1 mutations in animal and human disease models, including only SCN and FA as the IBMFS representatives without knowing if RUNX1 mutations may contribute to the development of malignancies in other IBMFS. A broader literature search and greater inclusion of studies about RUNX1 mutations in pathogenesis in other IBMFS may better represent and validate the inferences from this review.
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