Aubrey R Turner's research while affiliated with Wake Forest School of Medicine and other places
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Publications (68)
Background:
Prostate-specific antigen (PSA) screening may reduce death due to prostate cancer but leads to the overdiagnosis of many cases of indolent cancer. Targeted use of PSA screening may reduce overdiagnosis. Multimarker genomic testing shows promise for risk assessment and could be used to target PSA screening.
Methods:
To test whether co...
Background:
A rare mutation G84E in HOXB13 was recently identified to be associated with prostate cancer (PCa) in Caucasians. The goal of this study is to test association between HOXB13 genetic variants and PCa risk in Chinese men.
Methods:
All study subjects were part of the Chinese Consortium for Prostate Cancer Genetics (ChinaPCa). In the fi...
Results of bisulfied sequencing in the SPON2 promoter region.
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Differentially methylated genes by combination of DNA methylation and gene expression data.
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Bisulfite sequencing of the SPON2 promoter region. A. DMCs (red tick marks) in the SPON2 promoter region as identified by the HM450 array. Dark blue bars and lines indicate RefSeq genes SPON2 and LOC100130872, respectively. Black bars indicate a region evaluated with bisulfite sequencing. Green bars show a CpG island. B. Results of bisulfite sequen...
Primer sequences for bisulfite sequencing assay.
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Clinicopathological information of tissue samples. A. Inforamtion of the HM450 profiling samples. B. Inforamtion of the bisulfite sequencing samples.
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Schematic of enzyme reactions from serotonin to 5-hydroxyindoleacetate in the tryptophan metabolic pathway. Significantly deregulated genes in PCa are highlighted with green color.
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Aberrant expression of tryptophan metabolic pathway genes in PCa. Box plots of ALDH2 (A), ALDH3A2 (B), AOX1 (C), and MAOB (D) gene expression in PCa samples. The labels normal, PCa, and Met indicate adjacent normal prostate tissues, primary prostate cancer samples and metastatic cancer samples, respectively. Comparisons between normal and PCa, PCa...
Comparison of differentially methylated genes between genome-wide profiles and 67 known methylated genes in PCa.
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Results of bisulfite sequencing in the AOX1 promoter region.
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Association of AOX1 gene expression (A) or DNA methylation (B) with Gleason score in PCa. A. Box plot of AOX1 expression in PCa samples. The labels L-GS, H-GS, and Met indicate lower Gleason PCa, higher Gleason PCa, and metastatic cancer samples, respectively. B. Box plot of AOX1 methylation (cg02144933 of the HM27 data set) in PCa samples.
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List of Gleason score-associated DMCs in PCa.
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Aberrant DNA methylation and gene expression of PPARGC1A associated with Gleason score in PCa. A. Box plot of DNA methylation at the cg12691631 CpG site, in lower Gleason PCa and higher Gleason PCa samples. B. Box plot of PPARGC1A gene expression in PCa samples. The labels L-GS, H-GS, and Met indicate lower Gleason PCa, higher Gleason PCa, and meta...
Many differentially methylated genes have been identified in prostate cancer (PCa), primarily using candidate gene-based assays. Recently, several global DNA methylation profiles have been reported in PCa, however, each of these has weaknesses in terms of ability to observe global DNA methylation alterations in PCa. We hypothesize that there remain...
Bisulfite sequencing of the AOX1 promoter region. A. DMCs in the AOX1 promoter region has been identified by multiple PCa studies; the HM27 array (purple tick marks), the HM450 array (red tick marks) and the M-NGS data set (blue bar; partial). Black and green bars indicate the bisulfite-sequenced region and a CpG island, respectively. B. Results of...
Unsupervised hierarchical clustering of the entire HM450 DNA methylation data. A. Distribution of signal intensities of individual Swedish samples assayed via HM450 BeadChip after color balance adjustment and simple scaling normalization. B. A dendrogram of unsupervised hierarchical clustering using whole HM450 DNA methylation data after color bala...
Objective:
To examine African-American prostate cancer (PCa) survivors' involvement in treatment decision-making (TDM), and examine the association between TDM and quality of life (QOL), using secondary data.
Methods:
African-American PCa survivors (181) were recruited from the North Carolina Central Cancer Registry. Participants completed a cro...
Background:
Several germline single nucleotide polymorphisms (SNPs) have been consistently associated with prostate cancer (PCa) risk.
Objective:
To determine whether there is an improvement in PCa risk prediction by adding these SNPs to existing predictors of PCa.
Design, setting, and participants:
Subjects included men in the placebo arm of...
Turner AR, Kader AK, Xu J (Wake Forest University, Winston-Salem, NC; and University of California San Diego, La Jolla, CA; USA). Utility of Genome-Wide Association Study findings: prostate cancer as a translational research paradigm (Review). J Intern Med 2012; 271: 344–352.
Genome-Wide Association Studies have identified thousands of consistently...
Prostate cancer (PCa) risk-associated single-nucleotide polymorphisms (SNPs) are continuously being discovered. Their ability to identify men at high risk and the impact of increasing numbers of SNPs on predictive performance are not well understood.
Absolute risk for PCa was estimated in a population-based case-control study in Sweden (2,899 cases...
Single nucleotide polymorphisms (SNP) at 11q13 were recently implicated in prostate cancer risk by two genome-wide association studies and were consistently replicated in multiple study populations. To explore prostate cancer association in the regions flanking these SNPs, we genotyped 31 tagging SNPs in a approximately 110 kb region at 11q13 in a...
Four genome-wide association studies, all in populations of European descent, have identified 20 independent single nucleotide polymorphisms (SNP) in 20 regions that are associated with prostate cancer risk. We evaluated these 20 SNPs in a combined African American (AA) study, with 868 prostate cancer patients and 878 control subjects. For 17 of th...
Although prostate-specific antigen (PSA) is the best biomarker for predicting prostate cancer, its predictive performance needs to be improved. Results from the Prostate Cancer Prevention Trial revealed the overall performance measured by the areas under curve of the receiver operating characteristic at 0.68. The goal of the present study is to ass...
To search for genetic variants that are associated with prostate cancer risk in the genome, we combined the data from our genome-wide association study (GWAS) in a population-based case-control study in Sweden with publicly available GWAS data from the Cancer Genetic Markers of Susceptibility (CGEMS) study. We limited the cases to those with aggres...
A single nucleotide polymorphism (SNP) at 10q11 (rs10993994) in the 5' region of the MSMB gene was recently implicated in prostate cancer risk in two genome-wide association studies. To identify possible causal variants in the region, we genotyped 16 tagging SNPs and imputed 29 additional SNPs in approximately 65 kb genomic region at 10q11 in a Swe...
Fifteen independent genetic variants have been implicated in prostate cancer risk by recent genome-wide association studies. However, their association with clinicopathologic features of prostate cancer is uncertain.
We systematically evaluated these 15 variants in 1,563 prostate cancer patients undergoing radical prostatectomy, taking advantage of...
Prostate cancer cell lines provide ideal in vitro systems for the identification and analysis of prostate tumor suppressors and oncogenes. A detailed characterization of the architecture of prostate cancer cell line genomes would facilitate the study of precise roles of various genes in prostate tumorigenesis in general. To contribute to such a cha...
We carried out a fine-mapping study in the HNF1B gene at 17q12 in two study populations and identified a second locus associated with prostate cancer risk, approximately 26 kb centromeric to the first known locus (rs4430796); these loci are separated by a recombination hot spot. We confirmed the association with a SNP in the second locus (rs1164974...
Although it is well known that multiple genes may influence prostate cancer risk, most current efforts at identifying prostate cancer risk variants rely on single-gene approaches. In previous work using mostly single-gene approaches, we observed significant associations (P < 0.05) for 6 of 46 polymorphisms in five genes in a Swedish prostate cancer...
Single-nucleotide polymorphisms (SNPs) in five chromosomal regions--three at 8q24 and one each at 17q12 and 17q24.3--have been associated with prostate cancer. Each SNP has only a moderate association, but when SNPs are combined, the association may be stronger.
We evaluated 16 SNPs from five chromosomal regions in a Swedish population (2893 subjec...
Although genetic factors play an important role in most human diseases, multiple genes or genes and environmental factors may influence individual risk. In order to understand the underlying biological mechanisms of complex diseases, it is important to understand the complex relationships that control the process. In this paper, we consider differe...
A number of TMPRSS2/ERG fusion transcripts have been reported since the discovery that recurrent genomic rearrangements result in the fusion of TMPRSS2 and ETS family member genes. In this article we present evidence demonstrating that multiple genomic alterations contribute to the formation of various TMPRSS2/ERG transcripts. Using allele-specific...
Recent studies have provided evidence of associations between genetic markers at human chromosome 8q24 and an increased risk of prostate cancer. We examined whether multiple independent risk variants exist in this region and whether the strength of observed associations differs as a function of disease aggressiveness.
We evaluated associations betw...
Chromosome 6q14-21 is commonly deleted in prostate cancers, occurring in approximately 22% of all tumors and approximately 40% of metastatic tumors. However, candidate prostate tumor suppressor genes in this region have not been identified, in part due to the large and broad nature of the deleted region implicated in previous studies.
We first used...
The evidence for tumor suppressor genes at 8p is well supported by many somatic deletion studies and genetic linkage studies. However, it remains a challenge to pinpoint the tumor suppressor genes at 8p primarily because the implicated regions are broad. In this study, we attempted to narrow down the implicated regions by incorporating evidence fro...
Identifying genomic regions that are commonly deleted or gained in neoplastic cells is an important approach to identify tumor suppressor genes and oncogenes. Studies in the last two decades have identified a number of common DNA copy number alterations in prostate cancer. However, because of various sample sizes, diverse tumor types and sources, a...
Genetic susceptibility to prostate cancer has been consistently observed by a large number of studies. Recently, several pieces of evidence obtained from epidemiological and pathological studies support that chronic inflammation in prostate tissues may play a role in prostate cancer development. Multiple genes that play critical roles in inflammato...
Recent studies using ROMA and Array-CGH suggest that germline copy number polymorphisms (CNPs) involving >100 kb are common in humans.
In this study, we used the Affymetrix GeneChip 100K single nucleotide polymorphisms (SNP) mapping panel to further examine the type and frequency of germline CNPs in the genome. By utilizing the allele intensity dat...
While it is widely appreciated that prostate cancers vary substantially in their propensity to progress to a life-threatening stage, the molecular events responsible for this progression have not been identified. Understanding these molecular mechanisms could provide important prognostic information relevant to more effective clinical management of...
Although multiple recurrent chromosomal alterations have been identified in prostate cancer cells, the specific genes driving the apparent selection of these changes remain largely unknown. In part, this uncertainty is due to the limited resolution of the techniques used to detect these alterations. In this study, we applied a high-resolution genom...
Recently identified associations of prostate cancer risk with several genes involved in innate immunity support a role of inflammation in the etiology of prostate cancer. Considering inflammation is regulated by a complex system of gene products, we hypothesize sequence variants in many other genes of this pathway are associated with prostate cance...
MSR1 has been reported to be associated with increased risk of prostate cancer (PCa).
We performed a meta-analysis of all eight published studies to evaluate the pooled effect of three rare mutations (R293X, S41T, and D174Y) and five common sequence variants (PRO3, INDEL1, IVS5-59, P275A, and INDEL7), stratified by race and sporadic/hereditary canc...
The growing body of knowledge in cancer prevention demonstrates that for many cancers, risk must be defined in terms of both environmental and genetic factors. In prostate cancer, there is increasing evidence linking risk with polymorphisms in the alpha-methylacyl-CoA racemase (AMACR) gene and branched-chain fatty acids derived from specific source...
Chronic or recurrent inflammation has been suggested as a causal factor in several human malignancies, including prostate cancer. Genetic predisposition is also a strong risk factor in the development of prostate cancer. In particular, Toll-like receptors (TLR), especially the TLR6-1-10 gene cluster, are involved in prostate cancer development. Int...
It is widely hypothesized that the interactions of multiple genes influence individual risk to prostate cancer. However, current efforts at identifying prostate cancer risk genes primarily rely on single-gene approaches. In an attempt to fill this gap, we carried out a study to explore the joint effect of multiple genes in the inflammation pathway...
Evidence of the existence of major prostate cancer (PC)-susceptibility genes has been provided by multiple segregation analyses. Although genomewide screens have been performed in over a dozen independent studies, few chromosomal regions have been consistently identified as regions of interest. One of the major difficulties is genetic heterogeneity...
Recent findings of over-expression of the AMACR gene in prostate cancer and association between sequence variants in the AMACR gene and prostate cancer risk, along with the well established findings of association between prostate cancer risk and over-consumption of dairy products and red meat, indirectly suggest that phytanic acid, which primarily...
Chronic inflammation plays an important role in several human cancers and may be involved in the etiology of prostate cancer. Toll-like receptors (TLRs) are important in the innate immune response to pathogens and in cross-talk between innate immunity and adaptive immunity. Our previous finding of an association of TLR4 gene sequence variants and p...
To identify genes that generally increase the risk of cancer, we performed a systematic search throughout the genome in 188 families primarily ascertained for prostate cancer but which also included individuals with other cancers. We observed significant evidence for linkage between susceptibility to all cancers and markers at 3p24, with a peak HLO...
Inflammation has been implicated as an etiological factor in several human cancers. Growing evidence suggests that chronic inflammation may also play a role in the etiology of prostate cancer. Considering that genetic susceptibility is a major risk factor for this disease, we hypothesize that sequence variants in genes that regulate inflammation ma...
The loss of cell cycle control is believed to be an important mechanism in the promotion of carcinogenesis. CDKN1B (p27) belongs to the Cip/Kip family and functions as an important cell cycle gatekeeper. Several lines of evidence from clinical studies and laboratory experiments demonstrate that CDKN1B is an important tumor suppressor gene in prosta...
CYP1A1 is likely to play an important role in the etiology of CaP through its function in activating environmental procarcinogens and catalyzing the oxidative metabolites of estrogens. To test the hypothesis that genetic polymorphisms in the CYP1A1 gene may be associated with the risk for CaP, we compared the allele, genotype and haplotype frequenc...
A gene or genes on chromosome 8p22-23 have been implicated in prostate carcinogenesis by the observation of frequent deletions of this region in prostate cancer cells. More recently, two genetic linkage studies in hereditary prostate cancer (HPC) families suggest that germline variation in a gene in this region may influence prostate cancer suscept...
This chapter focuses on the hereditary components of prostate cancer. All cancer has a genetic component, yet only a fraction of cancers are hereditary. While hereditary mutations are present in every cell of the body, somatic mutations are present only in cells that arise from a specific somatic cell. Many inherited mutations do not unilaterally c...
The 5 alpha-reductase type II (SRD5A2) catalyzes the conversion of testosterone into the more potent androgen, dihydrotestosterone (DHT), and is thus believed to be the key enzyme for the control of intracellular DHT level in the prostate. Several single nucleotide polymorphisms (SNPs) in the SRD5A2 gene have been found to alter enzymatic activitie...
Hormonal carcinogenesis is an important and controversial area of current research. In addition to accelerating existing cancers, can hormones play the role of primary carcinogens? How do genetic factors influence hormone-related cancer risk? Hormones, Genes, and Cancer addresses these questions. Over the past few decades, cancer research has focus...
Rare germline mutations of macrophage scavenger receptor 1 (MSR1) gene were reported to be associated with prostate cancer risk in families with hereditary prostate cancer (HPC) and in patients with non-HPC (Xu et al. 2002). To further evaluate the role of MSR1 in prostate cancer susceptibility, at Johns Hopkins Hospital, we studied five common var...
The enzyme alpha-methylacyl-CoA racemase (AMACR) plays an important role in peroxisomal beta-oxidation of branched-chain fatty acid and therefore is relevant to carcinogenesis. The involvement of AMACR in prostate cancer (CaP) is implicated by the recent observation that expression of AMACR is consistently and extensively up-regulated in CaP. This...
Deletions on human chromosome 8p22-23 in prostate cancer cells and linkage studies in families affected with hereditary prostate cancer (HPC) have implicated this region in the development of prostate cancer. The macrophage scavenger receptor 1 gene (MSR1, also known as SR-A) is located at 8p22 and functions in several processes proposed to be rele...
8-Hydroxyguanine is a mutagenic base lesion produced by reactive oxygen species. The hOGG1 gene encodes a DNA glycosylase/AP lyase that can suppress the mutagenic effects of 8-hydroxyguanine by catalyzing its removal from oxidized DNA. A population-based (245 cases and 222 controls) and family-based (159 hereditary prostate cancer families) associa...
3beta-hydroxysteroid dehydrogenases (HSD3Bs), encoded by the HSD3B gene family at 1p13, have long been hypothesized to have a major role in prostate cancer susceptibility. The recent reports of a prostate cancer linkage at 1p13 provided additional evidence that HSD3B genes may be prostate cancer susceptibility genes. To evaluate the possible role o...
Androgen receptor (AR) has long been hypothesized to play an important role in prostate cancer etiology. Two trinucleotide repeat polymorphisms (CAG and GGC repeats in exon 1 of the AR gene) have been investigated as risk factors for prostate cancer in several studies. However, the results are inconclusive, probably because of the variations of stu...
Deletions on human chromosome 8p22-23 in prostate cancer cells1 and linkage studies in families affected with hereditary prostate cancer (HPC) 2-4 have implicated this region in the devel- opment of prostate cancer. The macrophage scavenger receptor 1 gene (MSR1, also known as SR-A) is located at 8p22 and functions in several processes proposed to...
Citations
... Prompt Prostate Genetic Score (PGS) (Stratify Genomics, San Diego, California) is a commercially available germline assay incorporating risk-associated genetic variants to provide a score indicating susceptibility to PCa (13)(14)(15). In this study, we used an existing model of PCa incidence and progression recalibrated to match the variation in risk of disease diagnosis across risk strata in a screened cohort with known Prompt PGS results. ...
... SPON2 expression is induced by the thyroid hormone (4,5) in human cancer. Kim JW et al. observed a negative correlation between the methylation status of SPON2 and its gene expression (6). Furthermore, the expression of SPON2 is associated with microRNAs (miRNAs) (7). ...
... The authors rightly point out that a more extensive study with collection of the humanistic aspects of the patient-provider interaction is needed with a larger sample size to understand what is mediating the patient experience. Future studies could assess the treatment decisionmaking preferences of the participants and the providers, measure the quality of the shared decision making, and can include a survey to assess the knowledge of the patients about the treatment options, their risks, benefits, and side effects after the patient and physician interactions.13 Overall, this study does suggest that Black men recruited into a research study, designed to capture the outcomes of a diverse cohort of patients with prostate cancer, experience similar degrees of quality in several health care quality metrics to White men. ...
... The underlying pathogenic mechanism for these variants is loss of DNA repair function, often due to frameshift or premature stop alterations causing protein truncation [3]. In addition to DDR genes, multiple genetic variants associated with prostate cancer risk have been found in the HOXB13 gene [4,5] in different ancestral populations, including European (eg, G84E) [6], Japanese (G132E) [7], and Chinese (G135E) [8] populations. Unlike pathogenic DDR gene variants, these HOXB13 variants result in alterations in a single amino acid, and while useful for early disease screening, there is little evidence supporting their prognostic and treatment utility. ...
... Genetic risk scoring in prostate cancer first started in 2008 when a five SNP PRS was shown to account for 46% of all prostate cancer cases when combined with family history in a cohort of Swedish men (Zheng et al., 2008). The validity of this score was confirmed in a United States population (Salinas et al., 2009) and, subsequently, multiple additional SNPs have been identified that provide incremental improvement in predicting biopsy positive prostate cancer, compared with family history alone (Kader et al., 2012;Sun et al., 2013;Liss et al., 2015). The genetic score acts independently of reported family history, indicating additional benefit (Amin Al Olama et al., 2016). ...
... GWASs have facilitated both the generation and evaluation of new hypotheses in basic science and clinical research over the last decade (Claussnitzer et al., 2015;Price et al., 2015;Turner et al., 2012). Most GWASs have been conducted in European populations, with relatively less comprehensive genetic information for other underrepresented populations (e.g., Arabic, Indian). ...
... EHBP is encoded by the EHBP1 gene, and this protein has been shown to portray a role in actin reorganization and endocytic trafficking [57]. Polymorphism in this gene at the single nucleotide level has been reported to cause prostate cancer [58]. SLF2 is a DNA damage response pathway gene that functions by regulating genomic stability by post-replication repair of damaged DNA [59]. ...
... Many genetic studies have identified PCa being linked to specific loci, Table 1. The major ity of these studies were once again initially performed in men of European or Asian de scent and many of these described loci have not been identified as being linked to PCa in men of African descent (PCa African loci) [42][43][44][45][46][47]. Some of the loci associated with PCa in men of European descent showed much lower effects, no effects, or even completely op posite effects in men of African ancestry [48]. ...
... Some of the most well-known risk SNPs for PCa in the Asian Indian cohort from genomewide association studies (GWAS) include rs16901979 and rs1447295 in the 8q24 region, rs10896449 in the 17q12 region, and rs6983267 in the 10q11 region. [21,22] However, it is important to note that having a risk SNP does not guarantee that an individual will develop PCa. Other factors, such as age, family history, and lifestyle, also play a role in determining a person's overall risk of developing the disease. ...
... In the ROC analysis, the pooled AUC estimate including 16 studies was 0.63 (95% CI 0.62-0.64), with some increment in discriminative capacity in addition to PSA, age, and family history [11][12][13]. In an analysis including PRS combined with clinical predictor variables, such as PSA, with 7 studies, the AUC increased to 0.74 (95% CI 0.68-0.81). ...