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Research Article
Open Access

Genetic Association Analysis of Cell Cycle Regulators Reveals YWHAZ Has Prognostic Significance in Prostate Cancer

CHIA-CHENG YU, LIH-CHYANG CHEN, WEN-HSIN LIN, VICTOR C. LIN, CHAO-YUAN HUANG, TE-LING LU, CHENG-HSUEH LEE, SHU-PIN HUANG and BO-YING BAO
Cancer Genomics & Proteomics March 2020, 17 (2) 209-216; DOI: https://doi.org/10.21873/cgp.20181
CHIA-CHENG YU
1Division of Urology, Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C.
2Department of Urology, School of Medicine, National Yang-Ming University, Taipei, Taiwan, R.O.C.
3Department of Pharmacy, College of Pharmacy and Health Care, Tajen University, Pingtung, Taiwan, R.O.C.
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LIH-CHYANG CHEN
4Department of Medicine, Mackay Medical College, New Taipei City, Taiwan, R.O.C.
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WEN-HSIN LIN
5Department of Pharmacy, China Medical University, Taichung, Taiwan, R.O.C.
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VICTOR C. LIN
6Department of Urology, E-Da Hospital, Kaohsiung, Taiwan, R.O.C.
7School of Medicine for International Students, I-Shou University, Kaohsiung, Taiwan, R.O.C.
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CHAO-YUAN HUANG
8Department of Urology, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan, R.O.C.
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TE-LING LU
5Department of Pharmacy, China Medical University, Taichung, Taiwan, R.O.C.
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CHENG-HSUEH LEE
9Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan, R.O.C.
10Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan, R.O.C.
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SHU-PIN HUANG
9Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan, R.O.C.
10Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan, R.O.C.
11Department of Urology, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan, R.O.C.
12Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan, R.O.C.
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  • For correspondence: shpihu@yahoo.com.tw bao@mail.cmu.edu.tw
BO-YING BAO
5Department of Pharmacy, China Medical University, Taichung, Taiwan, R.O.C.
13Sex Hormone Research Center, China Medical University Hospital, Taichung, Taiwan, R.O.C.
14Department of Nursing, Asia University, Taichung, Taiwan, R.O.C.
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  • For correspondence: shpihu@yahoo.com.tw bao@mail.cmu.edu.tw
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Abstract

Background/Aim: This study aimed to identify the genes that cause biochemical recurrence (BCR) following radical prostatectomy (RP) in men with localized prostate cancer. Patients and Methods: A two-stage genetic association study of 19 single-nucleotide polymorphisms in 11 key cell cycle regulation genes was carried out. BCR-free survival after RP was evaluated in a discovery cohort of 458 patients with prostate cancer, and replication was investigated in another cohort of 185 patients. Results: A consistent association was found between BCR and rs2290291 (discovery: p=0.008; replication: p=0.029). rs2290291 is located in the tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein zeta (YWHAZ), and was predicted to possess a regulatory function that affected YWHAZ expression. Furthermore, YWHAZ expression was frequently up-regulated in advanced tumours, and associated with poorer survival in patients with prostate cancer. Conclusion: YWHAZ rs2290291 was found to be associated with BCR. YWHAZ may function as a putative oncogene during prostate cancer progression.

  • Cell cycle
  • prostate cancer
  • recurrence
  • YWHAZ
  • biomarker

Prostate cancer is one of the most common cancers occurring in men, and an estimated 31,620 men will die of prostate cancer in the United States in 2019 (1). For the treatment of localized prostate cancer, radical prostatectomy (RP) remains a viable and commonly used option for curative treatment, but approximately 20-40 percent of men experience a biochemical recurrence (BCR) within 10 years after RP (2, 3). Owing to the heterogeneous nature of prostate cancer, it is a continuing challenge to determine risk stratification to facilitate a personalized treatment. In addition to the classical clinicopathological features indicating patient prognosis, it is necessary to define the specific genetic and molecular characteristics, which provide a more definitive insight into tumour biology and the optimization of individualized treatment.

The cell cycle is a sequence of events that regulate the replication, division, differentiation, and death of cells. It is controlled by a set of checkpoints that monitor completion of critical events and a cascade of protein phosphorylation that relays progression to the next stage (4). Dysregulation of this regulatory system is associated with carcinogenesis, tumour growth, metastasis, and the efficacy of anti-cancer treatments (5). Single nucleotide polymorphisms (SNPs) are the most frequent variations in the human genome. Accumulating evidence has demonstrated that SNPs in cell cycle regulators have functional significance and are linked to increased risk of a more aggressive disease in a variety of malignancies, including prostate cancer (6-10). However, little is known about the relationship between SNPs in cell cycle regulatory genes and inter-individual variations in influencing the risk of disease recurrence after prostate cancer surgery.

We hypothesized that genetic variants in the cell cycle regulation pathway might influence prostate cancer progression. Thus, we systematically evaluated the prognostic values of 19 SNPs in 11 key cell cycle regulators in a discovery cohort of 458 prostate cancer patients with BCR and investigated replication in an independent cohort of 185 patients. Further functional analyses supported the involvement of YWHAZ in prostate cancer progression.

Patients and Methods

Patient recruitment and data collection. In total, 643 patients were enrolled in the study from three medical centres in Taiwan: Kaohsiung Medical University Hospital, Kaohsiung Veterans General Hospital, and National Taiwan University Hospital, as described previously (11). All patients were unrelated, belonged to the Han Taiwanese population, confirmed to have prostate cancer based on histopathological information, and had undergone RP without adjuvant hormone therapy or radiotherapy. The study population was randomly divided into discovery and replication sets with a 7:3 ratio as shown in Table I, and the positive SNPs found in the discovery set were further confirmed in the replication set to reduce false discovery. Clinical data, including age at diagnosis, prostate-specific antigen (PSA), pathologic Gleason score, stage, surgical margin, and BCR status, were collected from patients' medical records. BCR was defined as two consecutive PSA measurements of 0.2 ng/ml or more following RP (12-15). BCR-free survival was defined as the time period between the RP and the last follow-up or BCR. The institutional review board of Kaohsiung Medical University Hospital approved this study (IRB no: KMUHIRB-2013132), and all participants provided written informed consent in accordance with the institutional guidelines.

SNP selection and genotyping. Based on the Kyoto Encyclopaedia of Genes and Genomes database, we selected 11 genes involved in cell cycle progression, including BUB1 mitotic checkpoint serine/threonine kinase (BUB1), BUB1 mitotic checkpoint serine/threonine kinase B (BUB1B), cyclin A2 (CCNA2), cyclin B1 (CCNB1), cyclin B2 (CCNB2), cell division cycle 20 (CDC20), cyclin-dependent kinase 1 (CDK1), PTTG1 regulator of sister chromatid separation, securing (PTTG1), TTK protein kinase (TTK), tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein gamma (YWHAG), and tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein zeta (YWHAZ). We initially selected 25 haplotype tagging SNPs (htSNPs) in these genes using SNPinfo (16) with a threshold - minor allele frequency of >0.05 in the HapMap CHB (Han Chinese in Beijing) population and a pairwise linkage disequilibrium squared correlation coefficient (r2) of >0.8. Genomic DNA was extracted from the peripheral blood of participants using the QIAamp DNA Blood Mini Kit (Qiagen, Valencia, CA, USA), and SNP genotyping was conducted using Agena Bioscience iPLEX matrix-assisted laser desorption/ionization time-of-flight mass-spectrometry technology at the National Centre for Genome Medicine, Taiwan, as described previously (17). Negative controls and 35 blind duplicates were used to control genotyping quality. The average genotype call rate for SNPs was 99.3%, and the concordance rate was 99.9%. Any SNP that failed the assay design (N=1), having a genotyping call rate of <80%, and deviated from Hardy-Weinberg equilibrium (p<0.01, N=4), or was non-polymorphic (N=1), was removed, leaving a total of 19 htSNPs for further analyses.

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Table I.

Clinicopathologic characteristics of the study populations.

Bioinformatics analysis. We used HaploReg v4.1 (18) to investigate whether the risk SNP, rs2290291, possessed potential regulatory functions. The Genotype-Tissue Expression (GTEx) portal (19) was used to assess the correlation between rs2290291 and YWHAZ mRNA expression. The prognostic effects of YWHAZ on prostate cancer were analysed using publicly available microarray datasets from Taylor et al. (20), Sboner et al. (21), and The Cancer Genome Atlas (TCGA) (22).

Statistical analysis. Kaplan–Meier analyses and log-rank tests were used to examine differences in BCR-free survival across different genotypes or gene expression groups. Univariate and multivariate Cox regression analyses were used to calculate the crude and adjusted hazard ratios (HRs) and their 95% confidence intervals (CIs) either without or with adjustment for age, PSA at diagnosis, pathologic Gleason score, stage, and surgical margin. A meta-analysis was performed to combine the normalized effect size of the expression quantitative trait loci (eQTL) in 9745 samples across 43 human tissues from the GTEx database. Statistical analyses were performed using Statistical Package for the Social Sciences software (SPSS), version 19.0.0 (IBM, Armonk, NY, USA). A two-sided p-value <0.05 was considered statistically significant.

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Table II.

Genotyped SNPs and the p-Values of their association with BCR after RP.

Results

The baseline clinical and pathological characteristics of patients in the discovery and replication sets are presented in Table I. No significant differences in these clinical features were observed between the discovery and replication sets. PSA at diagnosis, pathologic Gleason score, stage, and surgical margin were significantly associated with BCR-free survival in both sets.

Among the 19 SNPs evaluated in the discovery study, CCNA2 rs769240 and YWHAZ rs2290291 were associated with BCR-free survival (p≤0.038, Table II and Figure 1A). This association was consistently observed for YWHAZ rs2290291 in the replication set (p=0.029, Table III and Figure 1B). In a combined analysis, the YWHAZ rs2290291 G>A exhibited adverse outcomes for BCR-free survival, and the association remained significant in multivariate Cox analysis after adjusting for clinical risk factors, including age, PSA at diagnosis, pathologic Gleason score, stage, and surgical margin (adjusted HR=1.27, 95%CI=1.02-1.59, p=0.033, Table III and Figure 1C).

YWHAZ rs2290291 was not in linkage disequilibrium with other SNPs, and was found to overlap with promoter histone marks, DNase hypersensitivity sites, and protein binding sites in a variety of cell types according to the functional annotation of HaploReg (Table IV). The eQTL was investigated using GTEx data, and a trend was found involving decreased expression of YWHAZ for rs2290291 A>G transition in a meta-analysis of 9745 samples across 43 human tissues (p<0.001, Figure 2A). These findings indicated that up-regulation of YWHAZ expression in individuals carrying rs2290291A might result in the observed association with worse BCR-free survival.

To evaluate the role of YWHAZ in prostate cancer, we investigated the association between the YWHAZ expression and prostate cancer prognosis using TCGA datasets. Up-regulation of YWHAZ expression was found to be correlated with higher Gleason scores and advanced stage tumours (p<0.001, Figures 2B and C). Patients with a higher expression of YWHAZ also had significantly poorer overall survival than those with lower expression (p=0.019, Figure 2D). Consistently, there was a correlation of higher YWHAZ expression with decreased overall and BCR-free survival in another two independent prostate cancer microarray datasets (p≤0.012, Figures 2E and F).

Figure 1.
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Figure 1.

Kaplan–Meier survival curves of biochemical recurrence-free survival, according to YWHAZ rs2290291 genotypes in the (A) discovery set, (B) replication set, and (C) combined analysis. Numbers in parentheses indicate the number of patients.

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Table III.

SNPs associated with BCR in prostate cancer patients receiving RP.

Discussion

We conducted a two-stage study to identify the association between genetic variants in the cell cycle regulation pathway and prognosis of prostate cancer patients following RP. YWHAZ rs2290291 was consistently associated with BCR-free survival across both stages of the study. According to the GTEx dataset, rs2290291 is an eQTL that affects the expression of YWHAZ. Importantly, YWHAZ overexpression was observed in most advanced cancer tissues and correlated with shorter survival rates for prostate cancer patients.

YWHAZ, also known as 14-3-3ζ, belongs to the 14-3-3 protein family, which mediates signal pathways and controls many biological processes, including protein trafficking, metabolism, cell proliferation, migration, apoptosis, and cell cycle regulation, by binding to phospho-serine/threonine containing proteins (23). Elevated expression of YWHAZ has been linked to aggressive tumours, drug resistance, and poor prognosis in a variety of tumour types, including prostate cancer (24). Further, increased frequency of YWHAZ gene amplification in castration-resistant prostate cancer was found, when compared with localized disease (25). YWHAZ has been shown to be a direct androgen-responsive gene (26). Increased expression of YWHAZ promoted prostate cancer cell proliferation, migration, survival, and resistance to apoptosis, whereas YWHAZ knock-down significantly affected cancer cell aggressiveness (25, 27). Mechanistic studies have found that YWHAZ possessed oncogenic potential through interaction with a large group of regulatory proteins that were critical for cell proliferation and survival, such as PI3K, FOXO3a, BAD, and Raf-1 (28-30). Activation of PI3K/AKT signalling has been shown to promote cell survival by phosphorylation of FOXO3a, cytoplasmic sequestration of FOXO3a by binding YWHAZ, and consequently prevention of FOXO3a-induced proapoptotic transcriptional regulation (31). HaploReg data suggested that the genomic region containing the risk SNP rs2290291 might be regulatory, and rs2290291 was not in linkage disequilibrium with other SNPs, which indicated that this variant itself could play a role in prostate cancer. Therefore, rs2290291 could affect YWHAZ expression and influence PI3K/AKT/FOXO3a signalling, ultimately having an impact on prostate cancer cell survival. However, the exact role of YWHAZ in prostate cancer progression requires clarification in future studies.

Figure 2.
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Figure 2.

Functional analyses of YWHAZ rs2290291. (A) Forest plot for meta-analysis of the correlation between rs2290291 and YWHAZ expression in 9745 tissue samples from the GTEx dataset. Correlation of YWHAZ expression with prostate cancer progression. (B) High Gleason score and (C) high stage prostate cancers displayed significantly higher mRNA expression. Increased YWHAZ expression was significantly associated with poor (D) overall survival in the TCGA dataset, (E) overall survival in the dataset from Sboner et al. (2010), and (F) BCR-free survival in the dataset from Taylor et al. (2010). Patients were classified into low- and high-risk groups by an optimization algorithm for the minimum p-value. Numbers in parentheses indicate the number of patients. Rho: Spearman's rank correlation coefficient.

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Table IV.

Regulatory annotation of YWHAZ rs2290291.

There were some limitations in this study. The relatively small sample size of both cohorts did not allow for a more stringent level of statistical significance. Both of the study cohorts were Taiwanese; therefore, our findings may not be generalized to other ethnicities. There may be some other important cell cycle regulation genes that contributed to prostate cancer progression, which were not evaluated in this study. We were unable to provide proof that YWHAZ rs2290291 affected BCR in our study populations because the target tissues of the study participants were unavailable, thus warranting further study.

In summary, by using genetic association analysis and functional analyses, we highlighted the importance of YWHAZ in prostate cancer patient prognosis. Our results suggested that rs2290291 G>A may increase YWHAZ expression, resulting in poor prognosis, and could be a potential biomarker to predict clinical outcomes of RP in prostate cancer. However, the detailed molecular mechanisms underlying the role of YWHAZ in prostate cancer progression require further investigation.

Acknowledgements

This work was supported by the Ministry of Science and Technology of Taiwan (grant nos: 105-2314-B-650-003-MY3, 107-2320-B-039-010, 108-2813-C-039-148-B, 108-2314-B-037-029, 108-2314-B-037-026-MY2, and 108-2320-B-039-050-MY3), the Kaohsiung Medical University Hospital (grant no: KMUH108-8P53 and KMUH108-8R55), the E-Da Hospital (grant nos: EDPJ105054, EDPJ106038, and EDPJ107032), and the China Medical University (grant no: CMU107-S-42, CMU108-SR-121, and CMU108-MF-50). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The Authors would like to thank Chao-Shih Chen for data analysis, and the National Center for Genome Medicine, Ministry of Science and Technology of Taiwan, for technical support. The results published here are based in part on data generated by the HaploReg, GTEx, and TCGA projects.

Footnotes

  • ↵* These Authors contributed equally to this work.

  • Authors' Contributions

    C-CY, L-CC, W-HL, S-PH, and B-YB conceptualized and designed the study. L-CC, W-HL, T-LL, and C-HL performed the experiments. C-CY, VL, C-YH, and S-PH coordinated and supervised data collection. VL, C-YH, and B-YB performed the analysis. All the Authors drafted, reviewed and approved the manuscript.

  • This article is freely accessible online.

  • Conflicts of Interest

    The Authors declare that they have no conflicts of interest in regard to this study.

  • Received November 25, 2019.
  • Revision received December 3, 2019.
  • Accepted December 4, 2019.
  • Copyright© 2020, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Cancer Genomics - Proteomics: 17 (2)
Cancer Genomics & Proteomics
Vol. 17, Issue 2
March-April 2020
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Genetic Association Analysis of Cell Cycle Regulators Reveals YWHAZ Has Prognostic Significance in Prostate Cancer
CHIA-CHENG YU, LIH-CHYANG CHEN, WEN-HSIN LIN, VICTOR C. LIN, CHAO-YUAN HUANG, TE-LING LU, CHENG-HSUEH LEE, SHU-PIN HUANG, BO-YING BAO
Cancer Genomics & Proteomics Mar 2020, 17 (2) 209-216; DOI: 10.21873/cgp.20181

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Genetic Association Analysis of Cell Cycle Regulators Reveals YWHAZ Has Prognostic Significance in Prostate Cancer
CHIA-CHENG YU, LIH-CHYANG CHEN, WEN-HSIN LIN, VICTOR C. LIN, CHAO-YUAN HUANG, TE-LING LU, CHENG-HSUEH LEE, SHU-PIN HUANG, BO-YING BAO
Cancer Genomics & Proteomics Mar 2020, 17 (2) 209-216; DOI: 10.21873/cgp.20181
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Keywords

  • cell cycle
  • Prostate cancer
  • recurrence
  • YWHAZ
  • Biomarker
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