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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
Nat Genet. Author manuscript; available in PMC 2012 April 1.
Published in final edited form as:
PMCID: PMC3184204
NIHMSID: NIHMS315105

Heritable GATA2 Mutations Associated with Familial Myelodysplastic Syndrome and Acute Myeloid Leukemia

Abstract

We report the discovery of the GATA2 gene as a new myelodysplastic syndrome (MDS)/acute myeloid leukemia (AML) predisposition gene. We found the same, novel heterozygous c.1061C>T (p.Thr354Met) missense mutation in the GATA2 transcription factor gene segregating with the multigenerational transmission of MDS/AML in three families, and a GATA2 c.1063_1065delACA (p.Thr355del) mutation at an adjacent codon in a fourth MDS/AML family. The mutations reside within the second zinc finger of GATA2 which mediates DNA-binding and protein-protein interactions. We show differential effects of the mutants on transactivation of target genes, cellular differentiation, apoptosis and global gene expression. Identification of such predisposing genes to familial forms of MDS and AML is critical for more effective diagnosis and prognosis, counselling, selection of related bone marrow transplant donors, and development of therapies.

AML is the most common form of sporadic leukemia in adults 1 while MDS is a clonal disorder of hematopoietic stem cells characterized by ineffective hematopoiesis, with a tendency to progress to AML2. The study of families predisposed to particular malignancies is a successful strategy for discovering causative oncogenes and tumour suppressor genes (TSG). While rare, dozens of families developing non-syndromic forms of MDS and AML (i.e. lacking other systemic manifestations) have been described. To date, only two MDS/AML predisposition genes have been recognized: Runt-related transcription factor 1 (RUNX1/AML1) and CCAAT-enhancer binding protein α (CEBPA) (reviewed in3).

Here we report a highly specific p.Thr354Met heritable mutation in GATA2 co-segregating with with early onset MDS/AML in three families. We also report a family with MDS with a 3 bp heritable deletion in the GATA2 gene (p.Thr355del) deleting the second threonine in this sequence.

We determined the genomic DNA sequence of all RefSeq exons in 50 candidate genes (Supplementary Table 1) from patients representing five pedigrees with predisposition to MDS/AML, prescreened for absence of RUNX1 or CEBPA germline mutations. In three families, there was an identical heritable heterozygous variation in the transcription factor GATA2, c.1061C>T (p.Thr354Met) (Fig. 1, Supplementary Fig. 1). In all three families p.Thr354Met segregated with the disease for the samples tested, and no family members had AML or MDS who did not also carry p.Thr354Met (Fig. 1a, Supplementary table 2). There were also members in each family who carried this variant but were unaffected (Pedigree 1: III-5 and III-8; Pedigree 2: II-6; Pedigree 3: III-9).

Figure 1
Identification of novel germline p.Thr354Met and p.Thr355del variants in the highly conserved zinc finger 2 domain of GATA2 that is associated with MDS-AML

We recently identified a fourth family in which a father and son, both affected by MDS, shared a heterozygous heritable deletion of 3 bp in GATA2 (c.1063-1065delACA) resulting in p.Thr355del (Fig. 1, Supplementary Fig. 1). This codon is adjacent to the codon mutated in the first three families, and encodes the second of the five consecutive threonines.

p.Thr354 and p.Thr355del are the first two of five consecutive threonine residues in a highly conserved region of the GATA2 protein (Supplementary Fig. 1b) encoding zinc finger 2 (ZF2), which is involved in DNA binding, homodimerization and interaction with transcription factor PU.14,5. PolyPhen-2 predicts that p.Thr354Met and p.Thr355del are likely to affect GATA2 function. Somatic mutations in ZF2 of GATA2 have also been reported during chronic myeloid leukaemia (CML) blast crisis (BC) (p.Leu359Val, p.Ala341_Gly346del)6 and recently in ZF1 and ZF2 in AML-M57 (Fig. 1b,c). Somatic mutations in the corresponding ZF2 of the related protein family member GATA3 are found in breast cancer8 (Fig. 1c).

High resolution melt (HRM) analysis did not detect p.Thr354Met, p.Thr355del or other variants in exon 5 of GATA2 in 695 non-leukemic, ethnically-matched normal controls (i.e. 1390 chromosomes) (Supplementary Fig. 2a, Supplementary Note). Thus it is improbable that these variants represent rare polymorphisms. These variants were also not present in dbSNP132 or 1000 Genomes Project (January, 2011; URLs). Together with the disease segregation data, these results indicate that the GATA2 p.Thr354Met and p.Thr355del variants are the predisposing mutation in these families with familial MDS/AML.

A distinguishing feature of our families with GATA2 mutation was a lack of apparent “accessory” phenotype inside or outside the hematopoietic system, akin to the thrombocytopenia and eosinophilia seen in AML-predisposed families due to RUNX1 and CEBPA mutations, respectively9,10. In all 4 families, the GATA2 mutations were associated with early-onset MDS and/or AML displaying highly penetrant autosomal dominant inheritance and resulted in a poor outcome unless successfully transplanted (e.g. Pedigree 1: age of death from AML – 10 – 50 years; 2 individuals of age 58 and 62 years have mutation but no disease; all other siblings without the mutation are alive or have lived beyond 53 years) (Supplementary Table 2 and 3, Supplementary Note). For Pedigrees 1 and 311,12, the presentation varied with some displaying protracted MDS and others acute onset; the FAB subtype and karyotypic features of AML varied. In Pedigree 4, MDS was first diagnosed at age 13 in the son, who was treated with allogeneic bone marrow transplant at age 15; MDS was later diagnosed at age 53 in the father, who underwent allogeneic bone marrow transplantation.

Heritable GATA2 coding variations were not found in samples from another 8 families with multiple cases of AML, or in another 27 families with multiple occurrences of various lymphoid malignancies (11 NHL, 5 HL, 3 ALL, 7 CLL, 1 Multiple myeloma families). Also, no mutations were detected in GATA2 in 15 hematopoietic cell lines (Supplementary Table 4). No sequence variations were detected in the entire GATA2 coding region of 268 sporadic AML patient sample DNAs except a single c.182C>T (p.Ala61Val) variant in exon 2 (Supplementary Fig. 2c), which was assessed to be benign using PolyPhen-2 (URLs). Together, this suggests that point mutations and small indels in the GATA2 coding sequence are not frequent in sporadic AML.

Haplotype mapping using 8 informative single nucleotide polymorphisms (SNPs) within and surrounding the GATA2 gene demonstrated that the c.1061C>T (p.Thr354Met) mutation segregated within two distinct haplotypes (Supplementary Table 5) indicating that this mutation has arisen at least twice among the three families in which it is found.

GATA2 is a DNA-binding transcription factor which localizes predominantly to the nucleus. We generated cDNAs for the p.Thr354Met and p.Thr355del mutant GATA2 proteins and the acquired CML BC p.Leu359Val mutant6. Wildtype (WT) and mutant proteins expressed at comparable levels when transiently expressed in HEK293 fibroblasts (Fig. 2a) and when induced to express from a 4HT-responsive dual vector lentivirus system in stably transduced HL-60 promyelocytes (Supplementary Fig. 3a). Mutant proteins were expressed at comparable levels to wildtype (WT) GATA2 when transiently introduced into WT and mutant proteins appropriately localized to the nucleus (Fig. 2b, Supplementary Fig. 3b). However, the p.Thr354Met mutation dramatically reduced the ability of GATA2 to bind its consensus WGATAR DNA motif while p.Thr355del almost completely ablated DNA binding (Fig. 2c, Supplementary Fig. 3c).

Figure 2
Subcellular localisation and DNA binding properties of GATA2 WT and mutants

Molecular modeling of GATA2 ZF2 (Supplementary Fig. 4, Supplementary Note) demonstrated that the p.Thr354 residue does not contact DNA, but rather makes polar contact with adjacent threonines, and via its amino group with p.Cys349 which coordinates the zinc atom. Replacement of p.Thr354 with the bulky methionine moiety is predicted to alter the overall structure of this zinc finger by affecting zinc contacts. This may explain reduced binding of p.Thr354Met to DNA (Fig. 2c, Supplementary Fig. 3c). In contrast, p.Thr355del shortens the conserved threonine string, likely impacting the orientation and position of p.Leu359, which directly contacts DNA. These observations likely explain the almost-complete ablation of DNA binding.

Luciferase reporter assay experiments show that GATA2 p.Thr354Met and p.Thr355del had significantly reduced transactivation ability compared to WT on known GATA2 responsive enhancers (RUNX1 and CD34) and the LYL1 promoter (Fig. 3a,b,c). Experiments mixing WT with p.Thr354Met or p.Thr355del at a 1:1 ratio, mimicking heterozygosity, demonstrated a dominant negative effect of the mutants over WT transcription activation in multiple systems (Fig. 3d,e, Supplementary Fig. 5). Interestingly, WT and PU.1 transactivated the CSF1R (M-CSF-R) promoter 2.4 and 2.5-fold, respectively, but together synergized to induce 18-fold (Fig. 3e). While p.Leu359Val was similar to WT GATA2, p.Thr354Met and p.Thr355del gave dramatically reduced induction alone (1.5- and 0.9-fold) or with PU.1 (7- and 9-fold, respectively, compared to 18-fold with WT). p.Thr354Met and p.Thr355del also displayed dominant negative activity with transactivation by WT GATA2 reduced to 9- and 10-fold, respectively in the presence of these mutants (only marginally above the 7- and 9-fold with mutants alone). Hence, p.Thr354Met and p.Thr355del perturb the transactivation ability of GATA2, presumably by disrupting association with PU.1 or other interacting transcription factors, and are likely impact expression of downstream targets. Interestingly, while WT GATA2 displayed different responses in HEK293 versus Cos-7 cells on the RUNX1 enhancer (activating versus repressing, respectively), p.Thr354Met displayed loss-of-function activity in both cell types (Supplementary Fig. 6). Thus, on multiple GATA responsive elements, p.Thr354Met and p.Thr355del show loss-of-function and also dominant negative effects.

Figure 3
p.Thr354Met and p.Thr355del cause altered transactivation via target GATA2 response elements

HL-60 promyelocytes differentiate into granulocytes upon exposure to all-trans retinoic acid (ATRA), resulting in upregulation of CD11b, cessation of proliferation and subsequent promotion of apoptosis (Fig. 4). When expressed at equivalent levels under non-differentiating conditions, unlike WT and p.Leu359Val which inhibited proliferation and promoted apoptosis, p.Thr354Met and p.Thr355del acted as loss-of-function mutants (Fig. 4b,f,j). However, in the presence of ATRA, p.Thr354Met alone enabled cell proliferation/survival (Fig. 4h), while simultaneously inhibiting differentiation and apoptosis (Fig. 4d,m, Supplementary Fig. 7). p.Thr355del appeared to be a null mutant under these conditions.

Figure 4
p.Thr354Met inhibits differentiation and apoptosis while allowing accumulation of cells in the presence of ATRA-induced differentiation

In order to better understand the effects of the GATA2 mutants on gene expression, microarray analysis was performed to compare global gene expression in HL-60 cells expressing WT GATA2 and the three GATA2 mutants (Supplementary Table 6 and Supplementary Fig. 8). The data clearly showed that p.Thr355del and p.Thr354Met are almost total loss-of-function mutants (Supplementary Fig. 8). Note that, p.Leu359Val exhibits gain-of-function (1,253 newly regulated genes compared to WT GATA2) and partial loss-of-function (457 genes no longer regulated) while retaining 786 genes commonly regulated. These results are consistent with EMSA-western blot and transactivation assays. Further bioinformatics analysis indicated that MYC may be among key target which is repressed by GATA2 WT but not p.Thr354Met and p.Thr355del (Supplementary Table 6, Supplementary Note)

Interestingly, recurrent p.Leu359Val mutation in ZF2 of GATA2 was reported in 8/85 cases of CML BC6, a disease often phenotypically indistinguishable from AML. As shown in Fig. 1b,c, p.Thr354Met is situated between the deleted residues (p.Ala341_Gly346del), also observed in CML BC, and the p.Leu359 residue. p.Leu359 contacts DNA at the guanine residue of the WGATAR consensus motif and based on in vitro DNA binding and transactivation assays, p.Leu359Val has previously been reported to be a gain-of-function mutation while p.Ala341_Gly346del appears to be a partial loss-of-function mutation. p.Met354 or deletion of p.Thr355 may affect overall ZF structure (Supplementary Fig. 4) although we cannot exclude disrupted heterodimerization with GATA2’s interacting partners of GATA2 (Supplementary Table 7). We speculate that aberrant protein partnerships may explain dominant negative activity and adversely influences expression of genes critical to myelopoiesis.

The MDS/AML observed within these families is clinically heterogeneous, and demonstrate a variety of somatic chromosomal abnormalities, including monosomy 7, trisomy 8, and trisomy 21 (Supplementary Table 2). As such it is similar to familial MDS/AML with monosomy 73,13. Moreover, GATA2 mutations were not detected in 8 MDS/AML families in which RUNX1 and CEPBA mutations were excluded and 27 families presenting with lymphoid malignancy. Mutations at this position within ZF2 are likely to initiate an exclusively myeloid pathway of oncogenesis in which subsequent gene-specific, somatically acquired mutations probably define the particular type of disease that ultimately arises.

The mechanism by which GATA2 p.Thr354Met and p.Thr355del mutations function is distinct to that generally described for RUNX1 and CEBPA, which commonly act as classical TSG with a wide-range of mutations and requiring functional disruption of both alleles. Transcription factors are well characterized as targets of dominant negative or constitutively active mutations in cancer14,15, with RUNX1 mutations leading to a spectrum of outcomes including AML and ALL consistent with both TSG and dominant oncogene models16,17. While we have only been able to detect single allele GATA2 germline mutations in affected samples, we cannot rule out the possibility of acquired mutations in the “normal” allele.

GATA2 is indispensable for hematopoiesis17, 18,19. It associates with, regulates or is regulated by transcription factors implicated in myeloid malignancy (Supplementary Table 7). Many of these interactions involve ZF2 in which the p.Thr354Met and p.Thr355del mutations reside, and it is likely that changes in the nature of these interactions play an important role in predisposition to MDS/AML. Indeed, our co-transfection studies are consistent with altered transactivation by p.Thr354Met and p.Thr355del with PU.1 (Fig. 3e).

p.Thr354Met, p.Thr355del or any other mutations in GATA2 were absent in our heterogeneous cohort of sporadic AML patients, although we cannot rule out possible mutations in samples with low percentage blasts. This is consistent with other recent studies, however, suggesting that somatic GATA2 mutations in both ZF1 and ZF2 could be acquired only in specific AML subtypes such as AML-M57,20,21. GATA2 is, however, overexpressed in many cases of sporadic MDS22 and AML, particularly in FLT3-ITD+ AML23, suggesting that alterations to GATA2 expression, rather than direct mutation, may occur more commonly.. Further, chromosomal aberrations at the 3q21 breakpoint cluster encompassing a presumptive GATA2 regulatory region resulted in upregulated GATA2 expression in MDS and AML22,2426. In addition, retroviral insertional mutagenesis in NUP98-HOXD13 mice, a model for MDS/AML, identified Gata2 as a common insertion site in induced AML, all of which overexpressed Gata227. Hence, accumulating evidence suggests that aberrant activation or overexpression of GATA2 contributes to AML.

In this study, we show that GATA2 is a new predisposition gene for familial MDS/AML and demonstrate functional changes due to mutations within a highly conserved threonine repeat located in the second zinc finger. Our findings highlight the power of approaches investigating familial predispositions to cancer, and have implications for diagnostic genetic testing. The poor outcome associated with these mutations may suggest that an aggressive treatment strategy is appropriate for individuals carrying GATA2 mutations.

ONLINE METHODS

Patients

Families (Supplementary Table 2, Supplementary Note) were recruited and sample use approved through institutional human ethics review board approved protocols from the Australian Familial Haematological Cancer Study (Royal Adelaide Hospital (RAH) #091203 and #100702, and Children, Youth and Women’s Health Service #REC1542/12/12, Adelaide, SA Australia), The Queen Elizabeth Hospital and the University of Washington (Seattle, WA USA).

Sequence analysis of candidate genes

To identify germline and somatic mutations in patients with familial AML, a panel of 50 hematopoietic candidate genes, incorporating a total of 638 exons, was assembled (Supplementary Table 1). Primer design, PCR amplification, and dideoxy sequencing of genomic DNA purified from lymphoblastoid cells of probands from 7 MDS/AML pedigrees were performed by the Australian Genome Research Facility (AGRF). Sequences were aligned with NCBI RefSeq sequences using Mutation Surveyor (SoftGenetics) and variants compared to the UCSC and NCBI SNP databases for novelty. Sequence changes were confirmed by re-sequencing in both directions. Primer sequences are available upon request. Screening of control and sporadic AML populations was performed using high resolution melt (HRM) analysis (Supplementary Table 8 and Supplementary Note).

Cell culture

HEK293, 293T and Cos-7 cells were cultured in DMEM with 10% fetal bovine serum (FBS) (JRH Biosciences) and transient transfections were performed using Lipofectamine 2000 (Invitrogen). HL-60 promyelocytic cells were cultured in RPMI containing 10% FBS. All cultures contained 50 units/ml penicillin and 50 μg/ml streptomycin (Sigma).

Generation of mutant GATA2 plasmid and lentiviral expression constructs

An expression clone (pCMV6-XL6-GATA2) containing a 3.7 kb GATA2 cDNA insert was obtained from OriGene, and p.Thr354Met, p.Thr355del and p.Leu359Val mutants were generated by site directed mutagenesis. The coding regions of wildtype (WT), p.Thr354Met and p.Leu359Val were cloned into a dual lentiviral vector system which was used to generate HL-60 cells expressing GATA2 WT or mutants upon addition of 4-hydroxytamoxifen (4HT) (see Supplementary Note).

GATA2-responsive promoter and enhancer studies

The GATA2-responsive promoter (LYL1) and enhancer (RUNX) were PCR amplified and cloned into pGL4.12[luc2CP] (SfiI) and pGL3-Promoter (KpnI/BglII) (Promega), respectively. The CSF1R (M-CSF-R) promoter was PCR amplified and cloned into pGL4.12[luc2CP] (SfiI). See Supplementary Table 9 for PCR primers used. The GATA2-responsive CD34 enhancer-luciferase construct (CD34x2/Luc) and one with the GATA binding sites mutated (mutant CD34x2/Luc)31 were kindly provided by Tariq Enver, Weatherall Institute of Molecular Medicine, Oxford, U.K. HEK293 or Cos-7 cells were transfected at 90% confluence with Lipofectamine 2000. In all experiments, the molar equivalents of EV constructs were used to balance gene expressing constructs to avoid squelching artifacts. After 20 h, cells were harvested and luciferase activity determined with the Dual-Luciferase Reporter Assay System (Promega) using a GloMax®-Multi Detection System (Promega). All assays were performed a minimum of three times in triplicate. All results were analysed using Student’s t-test, and reported as mean ± s.e.m. with significance, p<0.05 (asterisk).

Cell differentiation and proliferation assays

HL-60 cells were plated at 1.25 × 104 cells/ml and treated with or without 30 nm 4-hyrdoxy tamoxifen (4-HT) for 24 h and then with or without 2 μM all-trans retinoic acid (ATRA). Cell numbers were determined by manual counting and FACS analysis (Phycoerythrin anti-mouse CD11b and Phycoerythrin rat IgG2b isotype control) (eBioscience) was performed 6 days after addition of ATRA (Sigma). The cells were also stained with hematoxylin and eosin for assessing morphological changes.

Haplotyping

Haplotype mapping was performed by PCR amplification and sequencing of amplicons containing 50 single nucleotide polymorphisms (SNP) within and surrounding the position of the p.Thr354Met variant of the GATA2 gene (Supplementary Table 10). All amplicons were generated using AmpliTaq Gold (Applied Biosystems) according to the manufacturer’s protocol using 2 mM MgCl2 and the following cycle strategy; 95°C, 10 min; 95°C, 30 s, 66°C – 58°C, 20 s (touchdown, 0.8°C/cycle for 10 cycles), 72°C, 45 s (total of 40 cycles); 72°C, 3 min.

Generation of mutant GATA2 plasmids and lentiviral expression constructs

An expression clone (pCMV6-XL6-GATA2) containing a 3.7 kb GATA2 cDNA insert was obtained from OriGene (Cat. No. SC125368). p.Thr354Met, p.Thr355del and p.Leu359Val mutants were generated by QuikChange mutagenesis (Stratagene) using the primers T354M-F and T354M-R, 355delT-F and 355delT-R, and L359V-F and L359V-R (Supplementary Table 11), respectively. For the generation of lentiviral expression constructs, the regulatable pF 5xUAS W SV40 Puro (5xUAS)32 was used. GATA2 WT or mutants were PCR amplified from the above pCMV6 plasmid vectors using the primers (KOZAK-GATA2-F and either GATA2-FLAG-R or GATA2-R) (Supplementary Table 12) and Pfu Turbo (Stratagene), excised with XbaI and cloned into the unique XbaI site of 5xUAS.

Generation of regulatable GATA2 expressing HL-60 cell lines

A dual lentiviral vector system was used to generate HL-60 cells expressing GATA2 WT or mutants upon addition of 4-hydroxytamoxifen (4HT) (Sigma). Infectious third generation lentivirus was made by cotransfecting 293T cells with either 5xUAS-GATA2 (WT or mutants) or pF GEV16 Super PGKHygro (GEV16)33 plasmid and the three packaging plasmids pHCMVwhvgagpolml, pHCMV-G and pHCMVwhvrevml34 (mass ratio 50:5:2.5:1). Supernatants were harvested 24 h later and filtered (Nalgene 45 μm syringe filter) (Nalge Nunc Int.). HL-60 cells were firstly transduced with GEV16 lentiviral supernatant including 4 μg/ml polybrene and 2.5 μg/ml fungizone. After 48 h, HL-60GEV cells were selected in 1 mg/ml hygromycin (Roche). These cells were subsequently transduced with the GATA2 (WT, p.Thr354Met, p.Thr355del and p.Leu359Val) or EV lentiviral supernatant and selected in 3 μM Puromycin (Sigma).

Immunofluorescence staining

HL-60 cells carrying stably transduced 4HT-regulatable GATA2 (WT, p.Thr354Met, p.Thr355del and p.Leu359Val) were treated with and without 100nM 4HT. After 24 h, the cells were fixed with 4% of paraformaldehyde for 10 min. The cells were permeabilized with 0.1% Triton/PBS, for 10 min and blocked with 2% BSA for 30 min. The cells were then stained with rabbit α-GATA2 antibody (Santa Cruz Biotechnology, Inc) (1:1000) for 1 h followed by Alexa 594-conjugated goat anti-rabbit secondary antibody (Molecular Probes) (2 μg/ml) for 20 min. The slides were mounted in Vectashield® mounting medium with DAPI (Vector Laboratories, Inc). Cells without primary antibody served as negative controls. All incubations were performed at room temperature.

Western blot analysis

HL-60 cells carrying stably transduced 4HT-regulatable GATA2 (WT, p.Thr354Met, p.Thr355del and p.Leu359Val) were treated with and without 100 nM 4HT. After 24 h, the cells were harvested in RIPA buffer (50 mM Tris-Cl pH 7.6, 150 mM NaCl, 1% Triton X-100, 0.5% sodium deoxycholate, and 0.1% sodium dodecyl sulfate with protease inhibitor (cOmplete Mini EDTA free protease inhibitor tablets, Roche Diagnostics)). Samples were loaded onto the 10% acrylamide gels, electrophoresed and transferred onto Hybond-P PVDF membranes (Amersham). Membranes were probed with antibodies using standard techniques and visualised using ECL plus detection reagents (Amersham) on x-ray film (Amersham Hyperfilm MP).

Apoptosis Assays

HL-60 cells were stained for surface Annexin V and propidium iodide according to the manufacturer’s protocol (#556547, Becton Dickinson).

Electromobility shift assay (EMSA) and EMSA-Western Blot

HEK293 cells were transfected with GATA2 WT or mutants using Lipofectamine 2000. After 24 h, nuclear extracts were prepared using a NE-PER® Nuclear and Cytoplasmic Extraction kit (Pierce) according to the manufacturer’s protocol. Double stranded DNA oligonucleotides containing two GATA binding sites (Human TCRδ enhancer) or a single GATA binding site (GATA Consensus and Human GM-CSF-153 promoter) were synthesized (Supplementary Table 13). Each single stranded oligomer was labeled using a Biotin 3′ End DNA Labeling kit (Pierce) and annealed according to manufacturer’s protocol. Electrophoretic mobility shift assays were performed using a modified protocol from Kumar et al 200835 and visualized using a Chemiluminescent Nucleic Acid Detection Module (Pierce) according to the manufacturer’s protocol. Double stranded labeled probes (100 fmol) were incubated with 3 μg of nuclear extract for 20 min in 1x binding buffer containing 20 mM HEPES-KOH, pH 7.9, 100 mM KCl, 2 mM MgCl2, 10 μM ZnSO4, 10 mM 2 mercaptoethanol, 0.1% NP-40, 10% glycerol, 0.2 mM EDTA and 5 μg/ml sheared salmon sperm DNA. Polyclonal rabbit α-GATA2 (H-116) antibody (Cat. No. sc-9008; Santa Cruz Biotechnology, Inc) (1:100) was added to nuclear lysates for 20 min prior to addition of probe to demonstrate GATA2 as the binding protein. To assess the specificity of the binding, 200-fold excess of each unlabeled probe was used as competitor. The mixtures were resolved in 6% non-denaturing polyacrylamide gels made in 0.5x TGE buffer (12.5 mM Tris-HCl, pH 8.5, 85 mM glycine and 0.5 mM EDTA) and the electrophoresis was performed at 4°C. For EMSA-Western blots, the experiment was carried as described above, except that the shifted DNA oligonucleotides-protein complexes were transferred onto nitrocellulose membrane, instead of PVDF. The membrane was probed with monoclonal mouse α-GATA2 (CG2-96) antibody (Cat. No. sc-267; Santa Cruz Biotechnology, Inc) and detection was performed as mentioned above.

Determination of genes differentially expressed in the presence of GATA2 mutants

HL-60 cell lines were treated with 100 nM 4HT to turn on GATA2 WT and mutant protein expression. After 24 h, gene expression levels were determined by microarray(Supplementary Note).

Supplementary Material

Acknowledgments

The authors would like to thank the families for their participation in our studies. Thanks also to Junia Melo for provision of CML cell lines and Raman Sharma for help with EMSA. Large scale Sanger sequencing was performed by the Australian Genome Research Facility, which was established through the Commonwealth-funded Major National Research Facilities program. This work was supported by grants from the National Health and Medical Research Council of Australia (program grants 257501 (HSS) and 219176 (HSS), fellowships 171601 (HSS) and 461204 (HSS), and a Dora Lush Postgraduate Award (CLC), Leukaemia Foundation of Australia (Grant in Aid to HSS, Postdoctoral fellowship to CLC), the Cancer Council of South Australia (HSS), and MedVet Pty Ltd (HSS and RDA) and NIH grant R01DK058161 (MSH).

Footnotes

URLs. dbSNP132, http://www.ncbi.nlm.nih.gov/SNP/; 1000 Genomes Project, http://www.1000genomes.org/; PolyPhen-2, http://genetics.bwh.harvard.edu/pph2/.

Accession numbers. Affymetrix expression data are available from Gene Expression Omnibus under accession GSE29276. Human GATA2 cDNA sequence is available from Genbank under accession number NM_032638.4.

AUTHOR CONTRIBUTIONS

C.N.H., R.J.D., M.S.H. and H.S.S. managed the project. C.N.H., C.L.C., E.J.W., C-E.C., P.J.B., X-C.L., M.S., M.L., A.C., Y.K.L., C.M.B., K.L.F. and A.E.T. performed the experiments. C.H.K. and R.J.D. performed structural modeling and C.N.H., C.H.K. and L.G. performed data analysis. L.B.T., M.A., J.S., P.G.B., G.K.S., R.J.D., M.S.H. and H.S.S. collected families with MDS/AML, and provided clinical data and samples. R.E. and P.G.E. participated in experimental design and provided critical reagents. A.L.B., I.D.L., S.M., L.B.T. provided sporadic AML samples and correlative clinical data. C.N.H., R.J.D., M.S.H. and H.S.S. wrote the manuscript.

COMPETING FINANCIAL INTERESTS

The authors declare no competing financial interests.

While this manuscript was under consideration, Hsu et al have identified germline GATA2 mutations, including p.Thr354Met and other ZF2 mutations in “MonoMAC syndrome”, an autosomal dominant syndrome associated with myelodysplasia and myeloid leukemias as well as monocytopenia, B and NK cell lymphopenia and mycobacterial, fungal and viral infections28. We also have reason to believe that the syndromes described by Mansour et al29 and Bigley et al30 are also related to germline mutations in GATA2.

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