Mutation of the gene PARK2, which encodes an E3 ubiquitin ligase, is the most common cause of early-onset Parkinson's disease1,2,3. In a search for multisite tumor suppressors, we identified PARK2 as a frequently targeted gene on chromosome 6q25.2–q27 in cancer. Here we describe inactivating somatic mutations and frequent intragenic deletions of PARK2 in human malignancies. The PARK2 mutations in cancer occur in the same domains, and sometimes at the same residues, as the germline mutations causing familial Parkinson's disease. Cancer-specific mutations abrogate the growth-suppressive effects of the PARK2 protein. PARK2 mutations in cancer decrease PARK2's E3 ligase activity, compromising its ability to ubiquitinate cyclin E and resulting in mitotic instability. These data strongly point to PARK2 as a tumor suppressor on 6q25.2–q27. Thus, PARK2, a gene that causes neuronal dysfunction when mutated in the germline, may instead contribute to oncogenesis when altered in non-neuronal somatic cells.
Parkinson's disease (PD) is the most common neurodegenerative movement disorder4. The familial, autosomal recessive form of PD is caused by germline mutations in the PARK2 gene, which result in early-onset loss of dopaminergic neurons in the substantia nigra1,2,3,5. PARK2 is widely expressed in a variety of tissues, including the brain (in neurons and astrocytes), lung, colon and testes6,7,8.
PARK2 associates with ubiquitin-conjugating enzymes, including UBCH7 and UBCH8, and is capable of promoting mono- and polyubiquitination of target proteins8,9,10. In neuronal model systems, these activities can regulate proteasome-mediated degradation11,12. PARK2 can target a number of protein substrates, which have been identified primarily using systems focused on studying neuronal cytoprotection13,14,15,16,17. Notably, PARK2-mediated degradation of cyclin E is important for preventing excitotoxicity in postmitotic neurons14. In neuronal model systems, PARK2 mutations that cause juvenile PD disrupt the ubiquitination activity of PARK2 and the regulation of proteasome-mediated degradation8,9,12,14,18,19,20,21. How PARK2 loss leads to PD is not entirely clear.
Chromosome 6q25.2–27 spans a large genomic region and undergoes frequent loss in a number of human cancers22,23,24,25,26. PARK2 is a potential candidate for a tumor suppressor gene at this locus, but intragenic mutations of this gene have not been reported25,27,28. Furthermore, copy number loss within this region varies greatly in size from one tumor to another, and the identity of a common target of deletion remains unclear29. PARK2 maps near FRA6E, a common fragile site in the human genome, which displays complicated copy number variants. Like the locations of FHIT (3p14.2) and WWOX (16q23.3), this site is hypothesized to contain a tumor suppressor gene30,31.
Here we present mutational and functional data that identify the ubiquitin E3 ligase PARK2 as a chromosome 6q tumor suppressor in glioblastoma multiforme (GBM), colon cancer and lung cancer. To identify tumor suppressors that are targeted in multiple tumor types, we examined array comparative genomic hybridization (aCGH) results from 98 colon cancer samples and 216 GBM tumor samples. For colon cancer, analysis of loci that were recurrently deleted demonstrated a focal region on chromosome 6q (Supplementary Fig. 1). The GBM dataset is from the Cancer Genome Atlas (TCGA)23. Copy number alterations (CNA) at the PARK2 locus for both GBM and colon cancers are shown in Figure 1. As expected, we observed frequent heterozygous and homozygous loss of variable size on 6q in GBM (see Online Methods)23. In GBM samples, 85% (53 out of 62) of samples with loss on 6q showed loss of the PARK2 gene within the area of CNA. In colon cancer samples, 100% (24 out of 24) of samples with loss on 6q showed loss of PARK2 within the CNA region. Loss of regions of various size encompassed PARK2 and were found in a substantial portion of tumors (Fig. 1, Table 1). Notably, in both tumor types, intragenic homozygous deletions were found in the PARK2 gene that removed exons but not any surrounding genes, thus pointing to PARK2 as a targeted gene on chromosome 6q. Genomic loss in GBM samples tended to encompass broad regions including the PARK2 gene, and intragenic microdeletions in PARK2 occurred in 2.3% of samples (Fig. 1, Table 1). This pattern is also seen in lung cancer, which is thought to be associated with deletion of a putative tumor suppressor at 6q25?27. The identity of the gene of interest in this region is difficult to determine due to the variable nature of copy number loss in this tumor type24. In contrast, the majority of the copy number loss on 6q25.2–q27 in our colon cancer samples occurred via focal events that affect PARK2 but not surrounding genes (Fig. 1, bottom). Such focal losses occurred in approximately 25% of all colon cancer samples we examined (Table 1), robustly identifying the PARK2 gene as the target of CNA. These results demonstrate the diversity of deletions at the PARK2 locus. Focal deletions that target PARK2 occur in both GBM and colon cancer, and PARK2 constitutes a specifically targeted gene on 6q for both tumor types. It is well known that different tumor types have an intrinsic variation in the sizes of, and the tendency to undergo, this type of genetic abnormality, which may be dependent on chromatin state32. However, at least in the case of GBM, we cannot rule out the possibility that there exist other 6q tumor suppressors.
No somatic mutations in PARK2 have been reported to date. To determine whether PARK2 mutations are present in GBM and other human tumors, we sequenced all exons of the gene in 242 human cancers (Supplementary Table 1). Whenever a presumptive mutation was identified in a primary tumor, we verified that the change did not correspond to a known SNP and determined whether it was somatically acquired (that is, tumor specific) by examining the sequence of the gene in genomic DNA from normal tissue of the same individual. No study participant had a history of early-onset PD, nor did any carry germline PD-associated alleles. Using this strategy, we identified PARK2 somatic mutations in human cancers for the first time, to our knowledge (Table 2, Supplementary Table 1 and Supplementary Fig. 2).
Figure 2 shows the distribution of our newly discovered mutations of PARK2 in cancers (Fig. 2a, top diagram). The bottom diagram shows the most common point mutations that cause early-onset PD. Notably, somatic PARK2 mutations in cancer occur in the same domains as the germline PD mutations. In both cases, mutations cluster in the ubiquitin-like domain (UBL), the RING finger domain and the in-between RING fingers domain (IBR). Two residues, Arg42 and Arg275, are mutated both in colon cancer and GBM and in PD. However, the resultant amino acids differ between the somatic cancer mutations and the germline PD mutations. We have mapped several of the cancer-specific mutations that lie within domains whose structures have been solved (UBL and IBR)33,34. The UBL domain is required for interactions with proteasomes and ligands. Disruption of Arg42 is predicted to disturb these interations33. Ile2 is located on the surface of the conserved β sheet of the UBL domain. The E344G mutation is located in the IBR domain, a region crucial for interaction with E2 and other members of the ubiquitination machinery35,36,37. This mutation lies adjacent to the zinc-binding core and resides within a region predicted to be critical for proper ubiquitination (Fig. 2b)34.
Examination of the copy number and mutation data (Fig. 1, Table 2) shows that although homozygous alterations do occur, most changes were heterozygous in nature. Thus, it may be that inactivation of a single copy of PARK2 is sufficient to impart a clonal growth advantage during tumor development. It is interesting to note that, in the literature, there is well-described precedent for haploinsufficiency of another cyclin E–targeting E3 ligase—encoded by the tumor suppressor FBXW7, also known as hCDC4 (ref. 38).
The molecular function of PARK2 in neurons is a subject of considerable investigation, and it is still not clear how PARK2 mutations cause PD. Less is known about the biological function of PARK2 in human cancers. We first sought to determine if PARK2 possesses growth-suppressive properties. PARK2 protein expression was determined in several cell lines (Supplementary Fig. 3). We cloned wild-type (WT) PARK2 cDNA and four PARK2 mutants. Transfection of all cDNAs resulted in production of PARK2 protein (Fig. 3a). To examine the functional consequences of reconstituting PARK2 expression in cancer cells, we transfected WT PARK2 into human cancer cell lines. PARK2 potently inhibited colony-forming activity in cell lines lacking PARK2 protein expression (Fig. 3b, Supplementary Fig. 4a) but not in cell lines that retained PARK2 expression (Fig. 3c, Supplementary Fig. 4b). We next sought to determine whether the cancer-specific mutations in PARK2 altered the protein's growth-suppressive properties. Expression of PARK2 with tumor-derived mutations resulted in substantially decreased colony-forming activity as compared to WT PARK2 (Fig. 3d, Supplementary Fig. 4c). Transfection of WT but not mutant PARK2 into cells from the DBTRG line resulted in a reduction in the rate of cell growth (Fig. 3e). WT PARK2 decreased tumor growth in vivo, a property that was reduced by the cancer-specific mutations (Fig. 3f). These data demonstrate that the PARK2 mutations in cancers have clear functional consequences.
What are the molecular mechanisms underlying PARK2 tumor suppression? PARK2 has previously been shown to be a ubiquitin E3 ligase that facilitates the ubiquitination of target proteins, leading to proteasome-mediated degradation8,13,39,40. We first wanted to determine whether cancer-specific mutations in PARK2 altered its ubiquitin ligase activity. We used a well-established assay to measure the ubiquitination function of PARK2 mutants in cells8,11,41. Cancer-specific mutations in PARK2 were found to substantially compromise the association of PARK2 with ubiquitinated target proteins in cancer cells (Fig. 4a). The mutations appeared to substantially decrease, but not completely abolish, the E3 ligase function. It is widely known that cyclin E is a fundamental component of the cell cycle machinery and is encoded by an oncogene42,43,44. We found that all PARK2 cancer mutations we analyzed resulted in a decreased ability of PARK2 to interact with cyclin E (Fig. 4b,c). Furthermore, the cancer-specific mutations compromised PARK2's ability to ubiquitinate cyclin E in vitro and degrade it (Fig. 4d). PARK2 mutations did not alter the protein's ability to regulate phosphorylation of c-Jun (Supplementary Fig. 5), another candidate effector of PARK2 function identified in neuronal systems19,45. Thus, the cancer-specific mutations in PARK2 abrogate the protein's ability both to block tumor cell growth and to ubiquitinate cyclin E, establishing a mechanistic link for the loss-of-function mutations.
If PARK2 normally targets cyclin E for ubiquitination and degradation in cancer cells, then depletion of PARK2 should result in an increase of cyclin E levels. We knocked down PARK2 in four cancer cell lines that show PARK2 expression. In all cell lines examined, knockdown of PARK2 with two independent short interfering RNAs (siRNAs), but not with scrambled-sequence siRNAs, resulted in an accumulation of cyclin E levels (Fig. 4e). Thus, PARK2 mutation and inactivation disrupts the ability of PARK2 to ubiquitinate cyclin E.
Fluorescence-activated cell sorting analysis revealed that PARK2 knockdown increased the proportion of cells in the S and the G2-M phases (Fig. 4f). Immunofluorescence staining showed a significant increase in the frequency of multipolar spindles and abnormal mitoses (Fig. 4g). Furthermore, PARK2 knockdown cells showed a marked increase in nuclear atypia characterized by micronuclei. Notably, this is what one observes when cyclin E is overexpressed46 or when FBXW7 (hCDC4), another protein that targets cyclin E for degradation, is inactivated47,48. These data show that PARK2 inactivation can lead to impaired mitosis.
The genetic and functional data we have presented demonstrate that the PD-associated gene PARK2 is a bona fide tumor suppressor gene that is inactivated and mutated in GBM, colon cancer and lung cancer. Genetic loss or mutational inactivation of PARK2 abrogates the ability of PARK2 to promote ubiquitination and results in cyclin E dysregulation, which can promote tumor cell growth49. Although the gene encoding cyclin E is an oncogene that has been strongly linked to tumorigenesis, we nevertheless cannot rule out the possibility that regulation of other targets is important. In addition, our study reveals several important points. First, the finding of somatic mutations and high frequency intragenic copy-number loss provides the strongest evidence yet that PARK2 is the (or at least one of the) 'long-sought' tumor suppressors on chromosome 6q. PARK2 may be one of a select group of tumor suppressors inactivated in a wide range of human malignancies23,24,32,50. Second, we determined that PARK2 mutations in cancer can decrease the E3 ligase's ability to ubiquitinate cyclin E. Many human tumors have increased cyclin E levels42, but to date, the mechanisms underlying this increase are unclear. Our study suggests that PARK2 can target cyclin E for ubiquitination, which, together with other factors such as FBXW7 (hCDC4), helps regulate cyclin E levels48,51,52. Because PARK2 is mutated in both PD and cancer, it is tempting to hypothesize that alterations of this gene may result in very different phenotypes depending on cellular context (Supplementary Fig. 6).
The finding of somatic mutations of PARK2, a PD-causing gene, in cancer is noteworthy from a pathophysiologic standpoint. It seems that inactivation of certain genes, such as PARK2, results in distinct physiological outcomes depending on cellular context. Indeed, the PTEN and ATM genes function as tumor suppressors, but their inactivation also leads to neuronal loss when the mutations are in the germline53,54. Unlike in these two cases, PARK2 germline mutation gives rise to a neurological disease but not also to a cancer predisposition syndrome. It is possible that PARK2 function may result in biological outcomes that are very different depending on whether the affected cell is a neuron or a dividing cell such as an astrocyte or epithelial cell; this seems more true for PARK2 than for PTEN or ATM. Notably, cohorts of individuals with PD do reveal a small but significant increase in the risk of malignancies such as brain and lung cancers55,56. We believe our study has wide implications for understanding oncogenesis for a number of tumor types.
Tumor samples, array CGH analysis and bioinformatics.
Colon tumor samples (n=98) from the Memorial Sloan-Kettering Cancer Center were obtained following participant consent and with institutional review board approval (Supplementary Note). Source DNAs were extracted from primary tumors for the aCGH study. The GBMs (n= 216) in the aCGH study were part of the TCGA initiative (4/14/2008 data freeze) (see URL section). aCGH was performed using the Agilent 244K microarray according to the manufacturer's instructions (Agilent Technologies). In our examination of both the colon cancer and GBM datasets, analysis of data for the CNAs observed was performed using the RAE method. The status of genomic loss at the PARK2 locus in colon cancer samples was assigned as either likely heterozygous loss (D0 ≥ 0.9) or homozygous deletion (D0 ≥ 0.9 and D1 ≥ 0.5), and in GBM as previously described per the multi-component model in RAE23,57. Cell lines sequenced were T98G, DBTRG, RKO, H441 and H358.
PCR amplification and sequencing.
Exonic regions for the PARK2 gene (NCBI Human Genome Build 36.1) were broken into 16 amplicons of 500 bp or less, and specific primers were designed using Primer3. Primers are listed in Supplementary Table 2. Standard M13 tails were added to the primers to facilitate Sanger sequencing. PCR reactions were carried out in 384-well plates in a Duncan DT-24 water bath thermal cycler with 10 ng of whole-genome amplified DNA (REPLI-g Midi, Qiagen) as a template, using a touchdown PCR protocol with KAPA Fast HotStart (Kapa Biosystems). The touchdown PCR method consisted of: 1 cycle of 95 °C for 5 min; 3 cycles of 95 °C for 30 s, 64 °C for 15 s, 72 °C for 30 s; 3 cycles of 95 °C for 30 s, 62 °C for 15 s, 72 °C for 30 s; 3 cycles of 95 °C for 30 s, 60 °C for 15 s, 72 °C for 30 s; 37 cycles of 95 °C for 30 s, 58 °C for 15 s, 72 °C for 30 s; 1 cycle of 70 °C for 5 min. Templates were purified using AMPure (Agencourt Biosciences). The purified PCR reactions were split into two and sequenced bidirectionally with M13 forward and reverse primer and the Big Dye Terminator Kit v.3.1 (Applied Biosystems) at Agencourt Biosciences. Dye terminators were removed using the CleanSEQ kit (Agencourt Biosciences), and sequence reactions were run on ABI PRISM 3730xl sequencing apparatus (Applied Biosystems).
Passing reads were assembled against the PARK2 reference sequence, which contains all coding exons in PARK2 including those 5 kb upstream and downstream of the gene, using command line Consed 16.0 (ref. 58). Assemblies were passed on to Polyphred 6.02b59, which generated a list of putative candidate mutations, and to Polyscan 3.0 (ref. 60), which generated a second list of putative mutations. The lists were merged together into a combined report, and the putative mutation calls were normalized to '+' genomic coordinates and annotated using the genomic mutation consequence calculator61. The resulting list of annotated putative mutations was loaded into a Postgres database along with select assembly details for each mutation call (assembly position, coverage and methods supporting mutation call). To reduce the number of false positives generated by the mutation detection software packages, only point mutations that are supported by at least one bidirectional read pair and at least one sample mutation called by Polyphred were considered, and only the putative mutations that are annotated as having nonsynonymous coding effects, occur within 11 bp of an exon boundary, or have a conservation score >0.699 (see URL section) were included in the final candidate list. Indels were manually reviewed and included in the candidate list if found to hit an exon. All putative mutations were confirmed by a second PCR and sequencing reaction in parallel with amplification and sequencing of matched normal tissue DNA.
All cell lines were obtained from American Type Tissue Culture and cultured using the recommended media (Invitrogen) + 10% FBS (Invitrogen) and penicillin plus streptomycin at 37 °C in 5% CO2. HEK 293T cells were cultured in Dulbecco's modified eagle's medium (DMEM) + 10% FBS (Invitrogen). Expression of PARK2 was accomplished by cloning the gene into the vector pcDNA 3.1 with a Flag tag (Invitrogen). Transfection was performed using Lipofectamine reagent according to the manufacturer's protocol (Invitrogen). Selection was performed using G418 or hygromycin. Cells used in colony formation assays were stained with crystal violet. Growth curve assays were quantified by manual counting with a Motic inverted microscope. All experiments were performed in triplicate.
Protein blot, immunoprecipitation and immunostaining.
Protein blot analysis was performed using standard methods. Antibody against the Flag epitope, the hemagglutinin tag and beta-actin were obtained from Sigma. PARK2 and cyclin E1 antibodies were obtained from Cell Signaling. Immunoprecipitation was performed using the Flag immunoprecipitation kit (Sigma). In vivo ubiquitination assay was performed as previously described8. The in vitro PARK2 ubiquitination assay was performed using the Parkin ubiquitination kit (Boston Biochem) per the manufacturer's protocol. Immunostaining was performed with antibodies to α-tubulin and γ-tubulin as previously described47. Staining for atypical nuclei and micronuclei was performed as previously described 48 h after siRNA transfection47.
Knockdown of PARK2.
PARK2 siRNAs were obtained from Invitrogen. PARK2 targeted sequences are listed in Supplementary Table 2. For siRNA knockdown of PARK2, cells were transfected using Lipofectamine RNAiMAX system (Invitrogen).
For retrovirus production, WT PARK2 and mutants were cloned into the vector pQCXIP (Clontech). HEK 293T cells were seeded in 10-cm-diameter dishes. The HEK 293T packaging cells (at 30–50% confluency) were co-transfected using Lipofectamine (Invitrogen) with pE-ampho vector (Takara Bio) and pQCXIP-PARK2. Retroviral particles were collected, filtered through the 0.45-μm syringe filter and used in the presence of polybrene (8 μg/ml final concentration) to infect cells for 12 h.
Mutations identified were engineered into pcDNA3.1-PARK2 using the QuikChange II XL kit (Stratagene). All changes were verified by Sanger sequencing.
Cells were trypsinized, fixed and stained using the standard propidium iodide method 48 h after transfection. Cell cycle analysis was performed on stained cells using a MoFlo cell sorter (Cytomation).
Mouse xenograft studies.
1 × 106 cells were suspended in 50% Matrigel and injected into the flanks of severe combined immunodeficiency mice. Growth was followed over time by taking caliper measurements. Eight mice were injected and 16 tumors were assessed for each condition.
Two-tailed Student's t-test analysis was performed using GraphPad Prism software.
TCGA initiative, http://cancergenome.nih.gov/index.asp; Primer3, http://frodo.wi.mit.edu/primer3/; Postgres, http://www.postgresql.org/; 17-way Cons Track Settings, http://genome.ucsc.edu/cgi-bin/hgTrackUi?hgsid=108554407&g=multiz17way; GraphPad Prism, http://www.graphpad.com/prism/Prism.htm.
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We thank J. Wongvipat, K. Huberman, I. Dolgalev and S. Thomas for exceptional technical expertise. We thank R. Levine for helpful discussions and comments. B.S.T. is the David H. Koch Fellow in cancer genomics. This work was supported in part by The Brain Tumors Funders' Collaborative Fund (I.K.M.), The Cancer Genome Atlas Project (N.S, C.S.), the Flight Attendants Medical Research Institute (T.A.C.), the Louis Gerstner Foundation (T.A.C.), the Memorial Sloan-Kettering Society (T.A.C.), the Elsa U. Pardee Foundation (T.A.C.) and the Doris Duke Charitable Foundation (T.A.C.).
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Veeriah, S., Taylor, B., Meng, S. et al. Somatic mutations of the Parkinson's disease–associated gene PARK2 in glioblastoma and other human malignancies. Nat Genet 42, 77–82 (2010). https://doi.org/10.1038/ng.491
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