RESUMO
BACKGROUND: Recurrent pregnancy loss (RPL) defined as three or more consecutive spontaneous miscarriages before the 20th week of gestation is caused by different factors including genetic and epigenetic background. However the involvement of paternal background on RPL is an interesting novel argument, which is not well studied. The main focus of the present study was to investigate for the association of paternal methylenetetrahydrofolate reductase (MTHFR) epigenotypes with sperm parameters and RPL. Moreover, the frequency of two of MTHFR Single Nucleotide Polymorphisms (SNPs) in males was assessed. METHODS: This is a case-control study. Methylation Specific PCR (MSP) was used to evaluate the methylation status of MTHFR promoter on sperm DNA of 25 male partners of RPL and 25 male partners of non-RPL couples. PCR-RFLP method was used to analyze 1,298 A>C (rs1801131) and 677 C>T (rs1801133) polymorphisms. RESULTS: No significant difference was observed in frequency of methylated MTHFR epigenotype between RPL and non-RPL males. Furthermore, methylated MTHFR epigenotype was more frequent (but not statistically significant) among men with abnormal sperm parameters compared to normal-sperm men. Among studied polymorphisms, only the mutated allele of C677T showed statistically higher prevalence among RPL males. CONCLUSIONS: Although our results do not establish any connection between MTHFR epigenotypes and RPL they do highlight the impact of C677T in the pathology.
Assuntos
Aborto Habitual/genética , Predisposição Genética para Doença/genética , Metilenotetra-Hidrofolato Redutase (NADPH2)/genética , Análise do Sêmen/métodos , Espermatozoides/metabolismo , Aborto Habitual/metabolismo , Adulto , Feminino , Humanos , Masculino , Metilação , Metilenotetra-Hidrofolato Redutase (NADPH2)/metabolismo , Polimorfismo de Nucleotídeo Único , GravidezRESUMO
Parkinson's disease (PD) is the second most prevalent neurodegenerative disorder. Both genetic and environmental factors are involved in the etiology of the disease. Many studies have revealed the susceptibility genes and variations for PD which need further confirmation. Here we evaluated the association of variations in SNCA, HUSEYO and CSMD1 genes with PD. A case-control study was conducted with 489 PD patients and 489 healthy controls. DNA was extracted from peripheral blood of all subjects and rs356220 and rs11931074 in SNCA, rs2338971 in HUSEYO and rs12681349 in CSMD1 were genotyped using PCR-RFLP method. The genotypes and allele frequencies were significantly different between case and control groups for rs356220, rs11931074 and rs2338971 but not for rs12681349. We provided further evidence that rs356220 is associated with increased risk of PD supporting previous studies in Caucasian-based and Japanese populations. The association of rs11931074 with decreased risk of PD was also significant. This study revealed the first evidence of the association of rs2338971 with increased risk of PD in the Iranian population. Nevertheless, these findings need further validation via more replication studies.
Assuntos
Heterogeneidade Genética , Predisposição Genética para Doença/genética , Proteínas de Membrana/genética , Doença de Parkinson/genética , Polimorfismo de Nucleotídeo Único/genética , alfa-Sinucleína/genética , Idoso , Feminino , Frequência do Gene , Estudos de Associação Genética , Genótipo , Humanos , Irã (Geográfico) , Masculino , Pessoa de Meia-Idade , Proteínas Supressoras de TumorRESUMO
Waardenburg anophthalmia syndrome (WAS) is a rare disorder that mostly affects the eyes and distal limbs. In the current study we reported two Iranian patients with WAS. The first case was a 26-year-old girl with unilateral anophthalmia, bilateral camptodactyly and clinodactyly in her hands, oligodactly in her left foot and syndactyly of the second to fifth toes in her right foot. She also had severe hearing loss in both ears. The second case was a 12-year-old boy with bilateral anophthalmia, camptodactyly in his right hand, oligodactyly in his foot, clubfoot, and cryptorchidism. Both patients were mentally normal. To detect the causative mutation all exons and exon-intron boundaries of SMOC1 gene were sequenced in patients and other normal family members. We found a homozygous missense mutation (NM_001034852.2(SMOC1):c.367T > C) in exon 3 of SMOC1 gene in both patients. As the mutation segregated with the disease in the family, it should be the causative mutation. Our study extended the mutation spectrum of SMOC1 gene related to WAS.
Assuntos
Mutação de Sentido Incorreto , Osteonectina/genética , Fenótipo , Síndrome de Waardenburg/genética , Adulto , Criança , Éxons , Feminino , Homozigoto , Humanos , Masculino , Osteonectina/química , Linhagem , Domínios Proteicos , Síndrome de Waardenburg/diagnósticoRESUMO
DNA variations in the fibroblast growth factor 20 gene have been reported to be associated with Parkinson's disease (PD). The rs12720208, a functional SNP located in the 3'UTR region of the gene, was reported as a risk factor for PD. A number of studies, which tried to replicate the result in different populations, failed to detect any associations. In this study, we genotyped rs2720208 SNP in 520 PD patients and 520 healthy controls both from Iran. Significant differences were found in allele and genotype frequencies between patients and controls (p<0.0001 for both). Our results suggest that the rs12720208 polymorphism may be a risk factor for PD in Iranian population.