Dataset Information

The polymorphism of rs11614913 T/T in pri-miR-196a-2 alters the miRNA expression and associates with recurrent spontaneous abortion in a Han-Chinese population.

ABSTRACT: Rs11614913 in pri-miR-196a-2 is involved in the occurrence of many diseases, especially in cancers. However, it remains unknown whether miR-196a-2 is associated with human recurrent spontaneous abortion (RSA) in Chinese Han population. Our study found that rs11614913 T/T in pri-miR-196a-2 was associated with the increase risk of human unexplained RSA (URSA) in recessive mode in Chinese Han population. The T allele of rs11614913 increased the production of mature miR-196a-3p. Rs11614913 T/T inhibited HTR-8/SVneo cells proliferation and migration and promoted cells apoptosis. Further investigation discovered that dihydrofolate reductase (DHFR) was the target of miR-196a-3p and inversely regulated by miR-196a-3p. Dual-luciferase assay indicated that T allele in miR-196a-2 rs11614913 could more effectively suppress DHFR expression than C allele. In addition, C to T substitution in miR-196a-2 rs11614913 attenuated the sensibility of cells to mifepristone. Collectively, our data suggest that miR-196a-2 rs11614913 T/T in pri-miR-196a-2 may be conductive to the genetic predisposition to RSA by disrupting the production of mature miR-196a-3p and reinforcing the expression of DHFR.

SUBMITTER: Wang X

PROVIDER: S-EPMC7269987 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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The polymorphism of rs11614913 T/T in pri-miR-196a-2 alters the miRNA expression and associates with recurrent spontaneous abortion in a Han-Chinese population.

Wang Xueqin X Zhang Lu L Guan Chunyi C Dong Yichao Y Liu Haining H Ma Xu X Xia Hongfei H

American journal of translational research 20200515 5

Rs11614913 in pri-miR-196a-2 is involved in the occurrence of many diseases, especially in cancers. However, it remains unknown whether miR-196a-2 is associated with human recurrent spontaneous abortion (RSA) in Chinese Han population. Our study found that rs11614913 T/T in pri-miR-196a-2 was associated with the increase risk of human unexplained RSA (URSA) in recessive mode in Chinese Han population. The T allele of rs11614913 increased the production of mature miR-196a- ...[more]

PMID: 32509188

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Project description:Polymorphisms in microRNA (miR) genes and their target sites are a distinct classification of variation in the human genome, which are rapidly being identified and investigated in human cancer. A polymorphism in the miR-196a-2 locus has demonstrated significant associations with various types of cancer, including lung, breast, esophageal and gastric tumors. However, miR-196a-2 has not been fully explored in ovarian cancer, which shares similar biological characteristics with other types of cancer. Therefore, the present study aimed to elucidate the association between a single nucleotide polymorphism (SNP) in the mature sequence of miR-196a-2 (rs11614913, T/C) and the clinical features of 479 Chinese patients with epithelial ovarian cancer (EOC). In addition, the biological significance of this polymorphism was investigated in the OVCAR3 ovarian cancer cell line. Risk association was evaluated in 479 cases of EOC patients and 431 controls. SNPs were analyzed by using polymerase chain reaction based restriction fragment length polymorphism assay. miR-196a expression was evaluated with reverse transcription polymerase chain reaction. The influence of miR-196a-2 rs11614913 T/C on EOC cell migration and invasion ability was further investigated in vitro. The results revealed significant differences in the homozygous CC genotype distribution in patients with EOC (n=479), compared with that of the control subjects (n=431; P=0.026). Analysis of the association between genotype and the risk of EOC revealed that individuals who carried the homozygous CC genotype were 1.34-fold more susceptible to EOC, compared with those carrying the wild-type TT and heterozygous CT genotypes [odds ratio, 1.34; 95% confidence interval, 1.04-2.17; P=0.023]. In addition, the role of this polymorphism in the production of mature miR-196a was investigated. Significantly enhanced production of mature miR-196a was revealed in the C-allelic compared with that of the T-allelic miR-196a-2 precursor (P<0.05). Further examination indicated that miR-196a significantly promoted cell migration and invasion ability in the human OVCAR3 ovarian cell line (P<0.05). In conclusion, the results indicated that the miR-196a-2 rs11614913 CC genotype may increase the risks of ovarian cancer by affecting the expression of mature miR-196a and enhancing cell migration/invasion. The current results provided evidence that the T>C polymorphism in the miR-196a-2 precursor may influence tumorigenesis and metastasis in EOC, and suggested that the functional SNP rs11614913 in the promoter region of pri-miR-196a-2 may be a potential indicator of EOC susceptibility in the population analyzed.

Project description:BackgroundRecurrent spontaneous abortion (RSA) refers to 2 or more consecutive pregnancy losses, and RSA with unknown causes is called unexplained recurrent spontaneous abortion (URSA). Tim-3, a subtype of the T-cell immunoglobulin domain and mucin domain (Tim) protein family, might be an important regulatory molecule that plays a pivotal role in URSA, which might be triggered mostly by Th1/Th2 immune deviation. To understand the etiology and pathogenesis of URSA in Han Chinese women, we investigated the association between polymorphisms of rs10053538 and rs10515746 in the promoter of Tim-3 and the risk of URSA in Han Chinese women.MethodsOne hundred and forty-eight women with RSA resulting in still birth were enrolled in the URSA group. We performed tests to rule out congenital reproductive system malformation, reproductive system tumor, endocrine dyscrasia, and chromosome abnormalities. One hundred and fifty-three women with normal pregnancy leading to live birth were selected at random to comprise the control group. All women included in this study were genetically unrelated Han Chinese women. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and allele-specific polymerase chain reaction (AS-PCR) were used to determine polymorphisms of rs10053538 and rs10515746, respectively, in all subjects. PCR products were chosen at random for sequencing.ResultsNo significant statistical difference was found between the distribution frequency of the GT + TT genotype and T allele on the rs10053538 locus in the URSA group or the control group (10.1% vs. 11.8%, Chi(2) = 0.205, P = 0.651; 5.1% vs. 6.5%, Chi(2) = 0.592, P = 0.441; respectively). Neither was there a significant difference between the distribution frequency of the GT + TT genotype and T allele on the rs10515746 locus in the groups (6.8% vs. 3.9%, Chi(2)1.201, P = 0.273; 3.4% vs. 2.0%, Chi(2) = 1.169, P = 0.280; respectively).ConclusionsThe present study suggested that these polymorphisms of rs10053538 or rs10515746 in the Tim-3 promoter may not be associated with URSA in Han Chinese women.

Dataset Information

The polymorphism of rs11614913 T/T in pri-miR-196a-2 alters the miRNA expression and associates with recurrent spontaneous abortion in a Han-Chinese population.

Publications

The polymorphism of rs11614913 T/T in pri-<i>miR-196a-2</i> alters the miRNA expression and associates with recurrent spontaneous abortion in a Han-Chinese population.

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