J Cancer 2019; 10(8):1808-1813. doi:10.7150/jca.29842 This issue Cite

Research Paper

LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk

Guoyuan Li1*, Wei Jia1*, Zijun Yin2*, Jinhong Zhu3, Guochang Liu1, Huimin Xia1, Jing He1 Corresponding address, Wen Fu1 Corresponding address

1. Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
2. Department of Oncology, The First Affiliated Hospital, Jinan University, Guangzhou 510632, Guangdong, China
3. Department of Clinical Laboratory, Molecular Epidemiology Laboratory, Harbin Medical University Cancer Hospital, Harbin 150040, Heilongjiang, China
*These authors contributed equally to this work.

Citation:
Li G, Jia W, Yin Z, Zhu J, Liu G, Xia H, He J, Fu W. LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk. J Cancer 2019; 10(8):1808-1813. doi:10.7150/jca.29842. https://www.jcancer.org/v10p1808.htm
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Abstract

Wilms tumor is one of the most prevalent pediatric malignancies in childhood cancer worldwide. A genome-wide association study recognized that LIM domain only 1 (LMO1) increases the risk of oncogenic potential. An association has been found that LMO1 gene polymorphisms are associated with the susceptibility to Wilms tumor. One hundred forty-five children with Wilms tumor and 531 cancer-free children were included in this hospital-based case-control study. Five potentially functional polymorphisms in the LMO1 gene (rs2168101 G>T, rs1042359 A>G, rs11041838 G>C, rs2071458 C>A and rs3750952 G>C) were genotyped by the TaqMan method. The association between selected polymorphisms and Wilms tumor susceptibility was measured by calculating the odds ratio (OR) and the 95% confidence interval (CI). Only rs2168101 G>T polymorphism was found to have a significant protective effect against Wilms tumor (GT vs. GG: adjusted OR=0.58, 95% CI=0.39-0.88, P=0.010; GT/TT vs. GG: adjusted OR=0.67, 95% CI=0.46-0.97, P=0.034). Moreover, carriers of 3-5 protective genotypes had significantly lower tumor risk than carriers of 0-2 protective genotypes (adjusted OR=0.62, 95% CI=0.42-0.91, P=0.022). The stratified analysis showed that the protective effect of rs2168101 GT/TT was predominant in males, and rs2071458 GT/TT was predominant in females. Regarding the combined risk genotypes, the analysis indicated that the 3-5 protective genotypes collectively decreased Wilms tumor risk in females. These results suggest that LMO1 gene rs2168101 G>T polymorphism may help prevent Wilms tumor, but this conclusion should be verified in other populations and additional studies.

Keywords: LMO1, polymorphism, Wilms tumor, susceptibility

Introduction

Wilms tumor, which is the common name for nephroblastoma, has been recognized as one of the most prevalent pediatric malignancies in childhood cancer, generally developing in children under 5 years of age and morphologically resembling embryonic kidney [1-3]. It constitutes approximately 8% of all cancers among children younger than 15 years in Western populations [4]. In Western populations, the occurrence rate of Wilms tumor is approximately 1/8,000 children [5], while the rate is approximately 3.3 cases per million in China [6]. Approximately 2% of Wilms tumor patients have a family history, and they are generally diagnosed as known causal genetic damage [7, 8]. However, no more than 5% of cases can be attributed to known causes, and the genetic basis underlying most Wilms tumor is not well understood [9]. Therefore, for Wilms tumor prevention and early diagnosis, it is important to identify risk factors and biomarkers that are associated with disease susceptibility to screen high-risk populations.

Genome-wide association study (GWAS) is a useful method employed without a hypothesis to find associations between susceptible genes and complex diseases, including tumors [9]. Previous GWASs and case-control studies have discovered several inherited susceptibility genes, such as FWT1 [10], FWT2 [11], BRCA2 [12], TP53 [13, 14], BARD1 [15], CTR9 [16], hOGG1 and FEN1 [17], and XPD [18] that are significantly associated with the risk of Wilms tumor. To date , no polymorphisms within lncRNAs and Wilms tumor risk have been reported, despite their implication in carcinogenesis as either proto-oncogenes or an anti-oncogenes [19]. Recently, we validated a critical susceptibility gene LIM domain only 1 (LMO1) [20] in a hospital-based, case-control study with a total of 145 Wilms tumor children and 531 cancer-free children, one of the members of the LMO gene super-family. The cysteine-rich transcriptional regulator is encoded by 11p15 in the LMO1 gene, comprising two LIM zinc-binding domains. The LMO1 gene is mainly concentrated in the nervous system and participates in the development of the nervous system [21]. Overexpression of LMO1 was initially found in patients with T-cell acute lymphoblastic leukemia [22].

In our previous study, four GWAS-identified LMO1 gene polymorphisms (rs110419 A>G, rs4758051 G>A, rs10840002 A>G and rs204938 A>G) were found to be associated with Wilms tumor susceptibility, but only the rs110419 A>G polymorphism may reduce the susceptibility to Wilms tumor [20]. Thus, other LMO1 gene polymorphisms require further determination to investigate Wilms tumor susceptibility. With this in mind, we carried out the current hospital-based case-control study with the same 145 Wilms tumor-bearing children and 531 cancer-free children to explore the association between five potentially functional polymorphisms in the LMO1 gene [rs2168101 G>T (a super-enhancer polymorphism identified by Oldridge et al.) [23], rs1042359 A>G, rs11041838 G>C, rs2071458 C>A and rs3750952 G>C] and Wilms tumor susceptibility in a southern Chinese population.

Materials and methods

Study subjects

Detailed information on the recruitment criteria has been reported previously [15, 24-26]. From March 2001 to June 2016, we recruited 145 Wilms tumor patients from the Department of Pediatric Urology of the Guangzhou Women and Children Medical Center. Moreover, 531 cancer-free children from the same hospital who had undergone routine physical examinations were randomly selected as controls [27-30]. All subjects were non-individual Han genetic individuals in South China. The response rate was approximately 90% for Wilms tumor patients and 95% for cancer-free controls. The Institutional Review Board of Guangzhou Women and Children's Medical Center approved this study, and each participant's parent or legal guardian provided medical informed consent.

Polymorphism analysis

Approximately 2 mL of peripheral blood was collected from each subject for DNA extraction. Five LMO1 potentially functional gene polymorphisms (rs2168101 G>T, rs1042359 A>G, rs11041838 G>C, rs2071458 C>A and rs3750952 G>C) were chosen for genotyping [31]. Genomic DNA was isolated from peripheral blood leukocytes through a TIANamp Blood DNA Kit (TianGen Biotech, Beijing, China). A 7900 Sequence Detection System (Applied Biosystems, Foster City, CA) and TaqMan real-time PCR were used in the LMO1 gene polymorphism genotyping, as described in previous articles [32-35]. To acquire reliable results, we performed the genotyping blindly without knowledge of whether the subject was a case or control subject. Moreover, 10% of the samples were selected randomly for repeated assays, and the genotype concordance was 100%.

Statistical analysis

The χ2 test was used to compare differences in the frequency distributions of demographic characteristics between cases and controls. The Hardy-Weinberg equilibrium for the genotype frequencies in controls was detected with a goodness-of-fit χ2 test. To further explore the associations between LMO1 polymorphisms and Wilms tumor susceptibility, we calculated the odds ratio (OR) and the 95% confidence interval (CI) using non-conditional logistic regression and adjusting for age and gender. All tests were two-sided. P<0.05 was considered statistically significant. All statistical analyses were performed with SAS software (Version 9.4; SAS Institute, Cary, NC).

Results

Population characteristics

Overall, 145 patients with Wilms tumor and 531 cancer-free children were included in our analysis. The demographic characteristics of the Wilms tumor children and the cancer-free children are presented in Supplementary Table 1. The mean age of the children with Wilms tumor was 26.17±21.48 months, and the mean age of the cancer-free children was 29.73±24.86 months. There was no significant difference in the age (P=0.725) or gender (P=0.956) distributions between patients and controls. According to the National Wilms Tumor Study-5 criteria [36], the clinical stages of the patients were divided into stages I-IV and 'not available', corresponding to 4 (2.76%), 49 (33.79%), 50 (34.48%), 33 (22.76%), and 9 (6.21%) cases, respectively.

Associations between LMO1 gene polymorphisms and Wilms tumor susceptibility

The genotype frequencies of the five selected LMO1 gene polymorphisms and their associations with Wilms tumor susceptibility are presented in Table 1. We observed that the frequency distributions of all of the LMO1 polymorphisms were consistent with the Hardy-Weinberg equilibrium (P=0.670 for rs2168101 G>T, P=0.065 for rs1042359 A>G, P=0.448 for rs11041838 G>C, P=0.911 for rs2071458 C>A and P=0.994 for rs3750952 G>C polymorphism) in controls. Among the five polymorphisms, we observed that the rs2168101 G>T polymorphism corresponded to a significant decrease in Wilms tumor susceptibility (GT vs. GG: adjusted OR=0.58, 95% CI=0.39-0.38, P=0.010; and GT/TT vs. GG: adjusted OR=0.67, 95% CI=0.46-0.97, P=0.034). However, no associations were found between the other four polymorphisms and Wilms tumor susceptibility. When these five polymorphisms of protective genotypes were combined, we found that the individuals with the five protective genotypes had reduced Wilms tumor susceptibility compared with those with 0-2 protective genotypes (adjusted OR=0.64, 95% CI=0.43-0.94, P=0.022).

 Table 1 

Genotype frequencies of LMO1 gene polymorphisms and Wilms tumor susceptibility

GenotypeCases (N=145)Controls (N=531)P aCrude OR (95% CI)PAdjusted OR (95% CI) bP b
rs2168101 G>T (HWE=0.670)
GG90 (62.07)275 (51.79)1.001.00
GT41 (28.28)217 (40.87)0.58 (0.38-0.87)0.0090.58 (0.39-0.88)0.010
TT14 (9.66)39 (7.34)1.10 (0.57-2.11)0.7821.14 (0.59-2.20)0.702
Additive0.0210.82 (0.61-1.10)0.1820.83 (0.61-1.12)0.214
Dominant55 (37.93)256 (48.21)0.0280.66 (0.45-0.96)0.0280.67 (0.46-0.97)0.034
Recessive131 (90.34)492 (92.66)0.3591.35 (0.71-2.56)0.3601.40 (0.73-2.66)0.310
rs1042359 A>G (HWE=0.065)
AA130 (89.66)485 (91.34)1.001.00
AG14 (9.66)43 (8.10)1.22 (0.65-2.29)0.5471.21 (0.64-2.28)0.564
GG1 (0.69)3 (0.56)1.24 (0.13-12.06)0.8511.13 (0.12-11.03)0.915
Additive0.8221.19 (0.68-2.08)0.5401.17 (0.67-2.04)0.582
Dominant15 (10.34)46 (8.66)0.5311.22 (0.66-2.25)0.5321.20 (0.65-2.22)0.561
Recessive144 (99.31)528 (99.44)0.8621.22 (0.13-11.84)0.8631.11 (0.11-10.84)0.927
rs11041838 G>C (HWE=0.448)
GG100 (68.97)386 (72.69)1.001.00
GC39 (26.90)136 (25.61)1.11 (0.73-1.68)0.6341.11 (0.73-1.68)0.638
CC6 (4.14)9 (1.69)2.57 (0.90-7.40)0.0792.51 (0.87-7.23)0.088
Additive0.1871.26 (0.89-1.79)0.1941.26 (0.89-1.78)0.203
Dominant45 (31.03)145 (27.31)0.3761.20 (0.80-1.79)0.3771.20 (0.80-1.78)0.385
Recessive139 (95.86)522 (98.31)0.0772.50 (0.88-7.15)0.0872.44 (0.85-6.99)0.096
rs2071458 C>A (HWE=0.911)
CC101 (69.66)324 (61.02)1.001.00
CA38 (26.21)181 (34.09)0.67 (0.45-1.02)0.0620.69 (0.45-1.04)0.078
AA6 (4.14)26 (4.90)0.74 (0.30-1.85)0.5200.71 (0.28-1.78)0.462
Additive0.1590.75 (0.53-1.04)0.0860.75 (0.54-1.05)0.090
Dominant44 (30.34)207 (38.98)0.0560.68 (0.46-1.01)0.0570.69 (0.47-1.03)0.067
Recessive139 (95.86)505 (95.10)0.7030.84 (0.34-2.08)0.7030.79 (0.32-1.97)0.619
rs3750952 G>C (HWE=0.994)
GG78 (53.79)253 (47.65)1.001.00
GC51 (35.17)227 (42.75)0.73 (0.49-1.08)0.1170.74 (0.50-1.10)0.137
CC16 (11.03)51 (9.60)1.02 (0.55-1.89)0.9561.06 (0.57-1.97)0.860
Additive0.2590.90 (0.68-1.19)0.4460.91 (0.69-1.21)0.524
Dominant67 (46.21)278 (52.35)0.1890.78 (0.54-1.13)0.1900.80 (0.55-1.15)0.229
Recessive129 (88.97)480 (90.40)0.6101.17 (0.64-2.12)0.6101.21 (0.66-2.19)0.538
Combined effect of protective genotypes c
0-255 (37.93)146 (27.50)1.001.00
3-590 (62.07)385 (72.50)0.0150.62 (0.42-0.91)0.0150.64 (0.43-0.94)0.022

a χ2 test for genotype distributions between Wilms tumor patients and controls. b Adjusted for age and gender. c The protective genotypes were carriers with rs2168101 GT/TT, rs1042359 AG/AA, rs11041838 GC/GG, rs2071458 CA/AA and rs3750952 GC/CC genotypes.

Stratification analysis

We performed an analysis stratified by age, gender, and clinical stages to further evaluate the combined effect of LMO1 gene polymorphisms (rs2168101 G>T and rs2071458 C>A) and the susceptibility of Wilms tumors given protective genotypes (Table 2). Compared to the rs2168101 GG genotype, the protective effect of the GT/TT genotype was more predominant in males (adjusted OR=0.50, 95% CI=0.30-0.84, P=0.009). Nevertheless, the rs2071458 CA/AA genotype was more predominant in females (adjusted OR=0.36, 95% CI=0.19-0.70, P=0.003). In addition, the combined analysis indicated that the 3-5 protective genotypes obviously decreased Wilms tumor susceptibility in females (adjusted OR=0.55, 95% CI=0.30-0.99, P=0.045).

Genotype-based mRNA expression analysis

As shown in Figure 1, the rs2168101 G>T polymorphism was also associated with altered LMO1 mRNA expression in skeletal muscle tissues based on the public database GTEx Portal (http://www.gtexportal.org/home/) [18, 37].

Discussion

In the current hospital-based case-control study, we explored the association of five LMO1 gene polymorphisms with Wilms tumor susceptibility in 145 patients and 531 cancer-free controls. Although an association between LMO1 gene polymorphisms and Wilms tumor susceptibility in Chinese children has been reported by our team, there are many more LMO1 gene polymorphisms worthy of exploration. In this study, we verified that the super-enhancer rs2168101 G>T polymorphism was significantly associated with a decreased risk of Wilms tumor, which was similar to the trend for neuroblastoma [23, 31].

On the basis of GWAS research, there is growing evidence that LMO1 is a significant determinant of cancer susceptibility. Wang et al. identified that four genetic variants of LMO1 (rs110419 A>G, rs4758051 G>A, rs10840002 A>G and rs204938 A>G) contributed to tumorigenesis ability in neuroblastoma among individuals of European descent [38]. Subsequently, this LMO1 gene polymorphism susceptibility was further confirmed in five other epidemiological studies of different ethnicities [39-43]. Apart from neuroblastoma, LMO1 gene polymorphisms were also associated with acute lymphoblastic leukemia susceptibility. In Caucasian children (163 patients and 251 controls), Beuten et al. found an association between another genotype of the LMO1 gene (rs442264 A>G) and susceptibility to acute lymphocytic leukemia [44]. In addition, recent studies have indicated that in anti-EGFR therapy, overexpression of LMO1 may be a predictive marker for colorectal cancer [45], lung cancer [46] and prostate cancer [47].

 Figure 1 

Expression quantitative trait loci (eQTL) analysis of LMO1 gene rs2168101 G>T. The genotypes of rs2168101 G>T was correlated to the expressions of LMO1 gene in Skeletal Muscle tissues were searched based on the public database GTEx Portal (http://www.gtexportal.org/home/).

J Cancer Image
 Table 2 

Stratification analysis of risk genotypes with Wilms tumor susceptibility

Variablesrs2168101
(cases/controls)
Adjusted OR a
(95% CI)
P ars2071458
(cases/controls)
Adjusted OR a
(95% CI)
P aCombined genotypes
(cases/controls)
Adjusted OR a
(95% CI)
P a
GGGT/TTCCCA/AA0-23-5
Age, month
≤1844/12822/1050.60 (0.34-1.07)0.08544/13922/940.75 (0.42-1.33)0.31626/6640/1670.61 (0.35-1.09)0.094
>1846/14733/1510.70 (0.42-1.15)0.15757/18522/1130.64 (0.37-1.10)0.10429/8050/2180.62 (0.37-1.06)0.079
Gender
Females36/12628/1070.93 (0.53-1.62)0.79351/13613/970.36 (0.19-0.70)0.00324/5740/1760.55 (0.30-0.99)0.045
Males54/14927/1490.50 (0.30-0.84)0.00950/18831/1101.08 (0.65-1.80)0.76031/8950/2090.71 (0.42-1.18)0.188
Clinical stages
I3/2751/2560.37 (0.04-3.57)0.3873/3241/2070.61 (0.06-6.02)0.6732/1462/3850.45 (0.06-3.29)0.432
II32/27517/2560.59 (0.32-1.10)0.09834/32415/2070.70 (0.37-1.33)0.27420/14629/3850.57 (0.31-1.04)0.068
III27/27523/2560.91 (0.51-1.63)0.75838/32412/2070.49 (0.25-0.96)0.03822/14628/3850.47 (0.26-0.86)0.014
IV21/27512/2560.60 (0.29-1.25)0.17521/32412/2070.91 (0.44-1.88)0.7898/14625/3851.22 (0.53-2.77)0.642
I+II35/27518/2560.58 (0.32-1.05)0.07137/32416/2070.69 (0.37-1.28)0.24122/14631/3850.56 (0.31-1.00)0.052
III+IV48/27535/2560.78 (0.49-1.24)0.29459/32424/2070.63 (0.38-1.05)0.07830/14653/3850.67 (0.41-1.09)0.108

a Adjusted for age and gender, omitting the corresponding stratification factor.

The associations of the LMO1 gene polymorphisms (rs110419 A>G, rs4758051 G>A, rs10840002 A>G and rs204938 A>G) with Wilms tumor susceptibility were reported in our previous study. Here, we performed a further study on the associations between five LMO1 gene polymorphisms (rs2168101 G>T, rs1042359 A>G, rs11041838 G>C, rs2071458 C>A and rs3750952 G>C) and Wilms tumor susceptibility in 145 patients and 531 healthy controls. We found that the GT/TT genotypes of the rs2168101 G>T polymorphism correspond to a significant decrease in Wilms tumor susceptibility, while we failed to detect significant associations between the other four polymorphisms and Wilms tumor susceptibility. The rs2168101 GT/TT genotypes carriers had a significantly decreased Wilms tumor risk. The protective effects of this SNP may be ascribed to the lower expression of LMO1 gene which is confirmed by Oldridge et al. [23] as well as data from GTEx database. Among these five polymorphisms we observed, the rs2168101 G>T polymorphism corresponded to a significant decrease in Wilms tumor susceptibility only for the rs2168101 GT carriers compared with the GG carriers, suggesting a protective effect of this polymorphism against Wilms tumor. There did not seem to be an association between the other four polymorphisms and Wilms tumor susceptibility. The relatively small sample size of this current study might have limited the statistical power for detecting a difference. Non-significant SNPs in the single locus analysis may collectively modify Wilms tumor susceptibility. Not surprisingly, the combined analysis indicated that 3-5 protective genotypes obviously decreased Wilms tumor susceptibility in females. However, there is still no direct evidence showing the exact association of LMO1 gene polymorphisms (rs2168101 G>T and rs2071458 C>A) with gender and clinical stage.

Several potential limitations of the current study may be ascribed to the following: 1) the relatively small sample size and lacking of multi-center clinical study, 2) the consideration of only five polymorphisms that lack potential function, and 3) the influence of environmental factors on Wilms tumor susceptibility.

In conclusion, we verified that the LMO1 super-enhancer rs2168101 G>T polymorphism was also significantly associated with a decreased risk of Wilms tumor.

Abbreviations

GWAS, genome-wide association study; LMO1, LIM domain only 1; OR, odds ratio; CI, confidence interval.

Supplementary Material

Supplementary tables.

Attachment

Acknowledgements

This study was supported by grants from the National Natural Science Foundation of China (No: 81803320), Science and Technology Project of Guangzhou (No: 201804010037), and the Science and Technology Planning Project of Guangdong Province (No: 2016A020215009).

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding address Corresponding authors: Wen Fu, Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Jinsui Road, Guangzhou 510623, Guangdong, China, Tel./Fax: (+86-020) 38076154, Email: lydia_fwcom; or Jing He, Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Jinsui Road, Guangzhou 510623, Guangdong, China, Tel./Fax: (+86-020) 38076560, Email: hejing198374com.


Received 2018-9-10
Accepted 2019-2-23
Published 2019-4-21


Citation styles

APA
Li, G., Jia, W., Yin, Z., Zhu, J., Liu, G., Xia, H., He, J., Fu, W. (2019). LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk. Journal of Cancer, 10(8), 1808-1813. https://doi.org/10.7150/jca.29842.

ACS
Li, G.; Jia, W.; Yin, Z.; Zhu, J.; Liu, G.; Xia, H.; He, J.; Fu, W. LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk. J. Cancer 2019, 10 (8), 1808-1813. DOI: 10.7150/jca.29842.

NLM
Li G, Jia W, Yin Z, Zhu J, Liu G, Xia H, He J, Fu W. LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk. J Cancer 2019; 10(8):1808-1813. doi:10.7150/jca.29842. https://www.jcancer.org/v10p1808.htm

CSE
Li G, Jia W, Yin Z, Zhu J, Liu G, Xia H, He J, Fu W. 2019. LMO1 Super-Enhancer rs2168101 G>T Polymorphism Reduces Wilms Tumor Risk. J Cancer. 10(8):1808-1813.

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