title: [Association of methionine synthase reductase gene polymorphism with unexplained recurrent spontaneous abortion].
abstract: OBJECTIVE
  To explore the relationship between the polymorphism of methionine synthase reductase (MTRR) A66G and the susceptibility to unexplained repeated spontaneous abortion (URSA).
  
  
  METHODS
  Total of 200 Henan Han couples with URSA (URSA group) and 76 Henan Han healthy couples without URSA (control group) were enrolled in this study. Their MTRR A66G genotypes were determined by PCR restriction fragment length polymorphism (PCR-RFLP).
  
  
  RESULTS
  (1) The allele frequencies of MTRR A66G: the frequencies of allele A and allele G in URSA group were 76.5% (153/200) in husband and 72.8% (146/200) in wife, 23.5% (47/200) in husband and 27.2% (54/200) in wife, respectively. The frequencies of allele A and allele G in control group were 78.9% (60/76) in husband and 78.3% (59/76) in wife, 21.1% (16/76) in husband and 21.7% (16/76) in wife, respectively. The frequencies of allele A and allele G were not significantly different between female and male subjects within the same experimental group (P > 0.05), and also there were not significantly different between the same gender subjects at URAS and control groups (P > 0.05). (2) The genotype frequencies of MTRR A66G: the frequencies of genotype AA, AG and GG in URSA group were 57.0% (114/200) in husband and 52.0% (104/200) in wife, 39.0% (78/200) in husband and 41.5% (83/200) in wife, 4.0% (8/200) in husband and 6.5% (13/200) in wife, prepectively. The frequencies of genotype AA, AG and GG in control group were 59.2% (45/76) in husband and 59.2% (50/76) in wife, 39.5% (30/76) in husband and 38.2% (29/76) in wife; 1.3% (1/76) in husband and 2.6% (2/76) in wife, prepectively. The frequencies of genotype AA, AG and GG were not significantly different between female and male subjects within the same group (P > 0.05), and also there were not significantly different between the same gender subjects at URSA and control groups (P > 0.05).(3)Combined genotype of couples: the combined genotype frequencies of GG + GG, GG + AG, GG + AA, AG + AG, AG + AA and AA + AA in URSA group were 1.0% (2/200), 2.5% (5/200), 6.0% (12/200), 20.0% (40/200), 38.0% (76/200), and 32.5% (65/200), prepectively; the combined genotype frequencies in control group were 0, 1.3% (1/76), 2.6% (2/76), 17.1% (13/76), 42.1% (32/76), 36.8% (28/76), prepectively. The combined genotype analysis between the two groups were also not significantly different (P > 0.05).
  
  
  CONCLUSIONS
  The polymorphism of MTRR A66G gene was not associated with the susceptibility to URSA (P > 0.05), and so it was not the inherited genetic risk factor of URSA.
authors.affiliation: Medical Genetics Institute, Henan Province People's Hospital, Zhengzhou 450003, China.
authors.forename: Qian-nan
authors.initials: QN
authors.lastname: Guo
authors.forename: Shi-xiu
authors.initials: SX
authors.lastname: Liao
authors.forename: Bing
authors.initials: B
authors.lastname: Kang
authors.forename: Ju-xin
authors.initials: JX
authors.lastname: Zhang
authors.forename: Rui-li
authors.initials: RL
authors.lastname: Wang
authors.forename: Xue-bing
authors.initials: XB
authors.lastname: Ding
authors.forename: Wei-hua
authors.initials: WH
authors.lastname: Zhang
mesh_terms: D000026:Abortion, Habitual / Q000235:genetics* / Q000473:pathology; D000328:Adult; D044466:Asian People; D016022:Case-Control Studies; D002681:China; D005260:Female; D005287:Ferredoxin-NADP Reductase / Q000235:genetics*; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011247:Pregnancy; D012307:Risk Factors; D055815:Young Adult
chemical_list: C111241:methionine synthase reductase; D005287:Ferredoxin-NADP Reductase