To explore the association of nitric oxide synthase 3 (NOS3) gene variable number of tandem repeat(VNTR) polymorphism in intron 4 and an 894(G/T) mutation at exon 7 with recurrent early spontaneous abortion (RESA).
One hundred and forty RESA women (patient group) and 140 healthy women with at least 1 pregnancy and without a history of pregnancy complications (control group) were included. The genotypes of NOS3 gene VNTR polymorphism were determined by polymerase chain reaction and agarose gel electrophoresis. The 894(G/T) mutation of genotypes of NOS3 gene at exon 7 was assessed by polymerase chain reaction-restrictive fragment length polymorphism.
The frequencies of aa and ba genotypes and a allele of NOS3 gene were higher in patient group than in control group (chi square: 4.51, P< 0.05; chi square: 4.29, P<0.05). The aa and ba genotypes were significantly associated with RESA (OR:1.8, 95% CI: 1.04-3.24). There was no significant difference in TT and GT genotypes and T allele of NOS3 gene between RESA patient group and control group (chi square: 1.16, P> 0.05; chi square:1.12, P> 0.05). 894(G/T) polymorphism may be not associated with RESA.
The genetic polymorphism of NOS3 gene 27 bp VNTR was associated with RESA. The genetic polymorphism of NOS3 gene 894(G/T) may be not associated with RESA. These results support that a allele of the NOS3 gene may be susceptibility allele.
[Show abstract][Hide abstract] ABSTRACT: Endothelium-derived nitric oxide (NO) is synthesized from L-arginine by endothelial nitric oxide synthase (eNOS) encoded by
the eNOS gene on chromosome 7. The effects of the eNOS polymorphisms with the risk of spontaneous pregnancy losses are conflicting. In this study, we investigated the association
of the eNOS genotypes with spontaneously aborted embryos in Koreans. Case-control studies were performed to evaluate the association
between endothelial nitric oxide synthase (eNOS) gene polymorphisms and spontaneously aborted embryos. Ninety-nine spontaneously aborted fetuses at <20 weeks of gestational
age and 103 child controls and 282 adult controls. Genotype frequency of three eNOS gene polymorphisms, −786T>C, VNTR in intron 4 (4a4b), and 894G>T in spontaneously aborted embryos was surveyed. The frequencies
of −786TC and CC genotypes in aborted embryos were significantly higher than in both child and adult controls. The frequencies
of 4a4a homozygote of VNTR polymorphism in intron 4 and TT homozygote of 894G>T polymorphisms were also higher in aborted
embryos than in adult controls. Haploptype analysis suggested that −786T>C polymorphism was a possible risk factor for spontaneously
aborted embryos. eNOS gene polymorphisms, −786T>C, VNTR in intron 4 (4a4b), and 894G>T, are associated with the risk of spontaneously aborted fetuses.
KeywordsEndothelial nitric oxide synthase (eNOS)-spontaneously aborted embryos (SAE)-polymorphism
[Show abstract][Hide abstract] ABSTRACT: Angiogenesis and an adequate blood supply are critical for several steps in human early pregnancy. Some studies have reported angiogenesis- and vasoconstriction-related genes are associated with recurrent pregnancy loss (RPL), but their sample size was limited. This study was conducted to investigate the genetic association between these angiogenesis- and vasoconstriction-related genes and idiopathic RPL, using meta-analyses.
A systematic review of the published literature from MEDLINE and EMBASE databases was conducted and investigations of an angiogenesis- and vasoconstriction-related gene polymorphism in RPL reported more than three times were selected. Aggregating data from eligible studies were integrated into meta-analyses by means of random effects models.
Of 185 potentially relevant studies, 18 case-control studies comprising a total of 2397 RPL patients and 1760 controls were included into the meta-analyses. Among these genetic association studies were 4 reports of vascular endothelial growth factor (VEGF) (-1154G>A) polymorphisms, 4 reports of p53 (codon72) and 10 reports of endothelial nitric oxide synthase (eNOS) (B/A, Glu298Asp) with RPL. The integrated results showed that VEGF (-1154G>A), p53 (codon 72) and eNOS (Glu298Asp) polymorphisms were significantly associated with RPL, and their summary odd ratios [95% confidence interval (CI)] were 1.51 (1.13-2.03), 1.84(1.07-3.16) and 1.37 (1.11-1.69), respectively. The summary odd ratio of the eNOS (B/A) polymorphism in RPL was 1.15 (0.94-1.41), and failed to show significance at meta-analysis.
Meta-analyses of available data showed significant associations between the VEGF (-1154G>A), p53 (codon72) and eNOS (Glu298Asp) polymorphisms and idiopathic RPL. These angiogenesis- and vasoconstriction-related genes jointly confer higher susceptibility to idiopathic RPL.
Human Reproduction Update 06/2011; 17(6):803-12. DOI:10.1093/humupd/dmr027 · 10.17 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Abstract We investigated the association of endothelial nitric oxide synthase (NOS3) polymorphisms rs2070744 (-786T> C), 27-bp repeat 4b/4a, rs1799983 (Glu298Asp), rs3918188 (-734C> A), and rs743507 (113G> A) with idiopathic recurrent miscarriage (IRM). This was a case-control study involving women with confirmed IRM (n = 296), and 305 age- and ethnically matched control women. NOS3 rs2070744, rs1799983, rs3918188, and rs743507 genotyping was done by TaqMan assays; NOS3 4b/4a genotyping was done by PCR-ASA. A higher frequency of -786C and 298Asp alleles was seen in IRM cases, which remained associated independently with IRM on multivariate analysis. Allele and genotype distribution of 4b/4a, rs3918188 (-734C> A) and rs743507 (113A> G) were comparable between IRM cases and control women. Taking homozygous wild-type genotype as a reference, regression analysis confirmed the association of Glu298Asp and -786T/C, and rs743507 homozygous carriers with IRM risk. Marked linkage disequilibrium was seen between tested NOS3 variants, thus allowing the construction of 5-locus [-786T> C/4b4a/Glu298Asp/-734C> A/113G> A] haplotypes. Taking the common T4bGCA haplotype as a reference, multivariate analysis confirmed the positive association of C4bTCG haplotype with IRM, after controlling for traditional covariates. Genetic variation at the NOS3 locus represents a genetic risk factor for increased susceptibility to IRM.
Human Fertility 09/2013; 16(3):200-6. DOI:10.3109/14647273.2013.806824 · 0.91 Impact Factor
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