title: [Study on the relationship of MTHFR polymorphisms with unexplained recurrent spontaneous abortion].
abstract: OBJECTIVE
  To assess the relationship of methylenetetrahydrofolate reductase (MTHFR) C677T genotypes to unexplained recurrent spontaneous abortion (URSA).
  
  
  METHODS
  This study included two groups:57 currently non-pregnant women with a history of URSA (URSA group), and 50 currently non-pregnant women with a history of having given birth to at least one live baby and without any history of spontaneous abortion, still-born fetus, placental thrombosis and intrauterine growth retardation(IUGR)(control group). The fasting serum-Hcy was measured with high pressure liquid chromatography. Folic acid and vitamin B(12) were detected by radioimmune assay; antiphospholipid antibody (ACA) was detected by ELISA. MTHFR C677T gene polymorphisms were detected by the technique of polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
  
  
  RESULTS
  C/C genotype in URSA group was significantly lower than that in control group, the total mutant T allele frequency was significantly higher than that in control group. There was no significant difference in respect of "age, rural area/city, period, primary/secondary abortion" between the genotype distributions of MTHFR C677T. The T/T genotype and C/T+T/T genotypes frequencies for "abortion times>or=3" were higher than those for "abortion time <3".
  
  
  CONCLUSIONS
  MTHFR C677T gene polymorphism is a genetic risk factor for URSA.
authors.affiliation: Department of Obstetric and Gynecology, Qilu Hospital, Shandong University, Jinan, Shandong, PR China. lixmei@sina.com
authors.forename: Xiao-mei
authors.initials: XM
authors.lastname: Li
authors.forename: You-zhong
authors.initials: YZ
authors.lastname: Zhang
authors.forename: Yan-xue
authors.initials: YX
authors.lastname: Xu
authors.forename: Sen
authors.initials: S
authors.lastname: Jiang
mesh_terms: D000026:Abortion, Habitual / Q000097:blood / Q000201:enzymology / Q000235:genetics*; D000328:Adult; D000483:Alleles; D002681:China; D004252:DNA Mutational Analysis / Q000379:methods; D005260:Female; D005492:Folic Acid / Q000097:blood; D005787:Gene Frequency; D005838:Genotype; D006710:Homocysteine / Q000097:blood; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D014805:Vitamin B 12 / Q000097:blood
chemical_list: D006710:Homocysteine; D005492:Folic Acid; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D014805:Vitamin B 12