RESUMO
In this study, the role of known Parkinson's disease (PD) genes was examined in families with autosomal recessive (AR) parkinsonism to assist with the differential diagnosis of PD. Some families without mutations in known genes were also subject to whole genome sequencing with the objective to identify novel parkinsonism-related genes. Families were selected from 4000 clinical files of patients with PD or parkinsonism. AR inheritance pattern, consanguinity, and a minimum of two affected individuals per family were used as inclusion criteria. For disease gene/mutation identification, multiplex ligation-dependent probe amplification, quantitative PCR, linkage, and Sanger and whole genome sequencing assays were carried out. A total of 116 patients (50 families) were examined. Fifty-four patients (46.55%; 22 families) were found to carry pathogenic mutations in known genes while a novel gene, not previously associated with parkinsonism, was found mutated in a single family (2 patients). Pathogenic mutations, including missense, nonsense, frameshift, and exon rearrangements, were found in Parkin, PINK1, DJ-1, SYNJ1, and VAC14 genes. In conclusion, variable phenotypic expressivity was seen across all families.
Assuntos
Família , Mutação/genética , Transtornos Parkinsonianos/genética , Adulto , Sequência de Aminoácidos , Sequência de Bases , Éxons/genética , Feminino , Humanos , Peptídeos e Proteínas de Sinalização Intracelular , Masculino , Proteínas de Membrana/genética , Pessoa de Meia-Idade , Monoéster Fosfórico Hidrolases/genética , Proteínas Quinases/genética , Ubiquitina-Proteína Ligases/genética , Adulto JovemRESUMO
A recent large-scale study have reported that rs1063843, a single nucleotide polymorphism located in the CAMKK2 gene is highly associated with schizophrenia in European and Han Chinese populations. Increasing evidences show that schizophrenia and bipolar disorder have some common genetic variance. Here, we evaluated the association of this variant with schizophrenia and bipolar disorder in Iranian population. Genomic DNA was extracted from peripheral blood of 500 schizophrenic patients, 500 bipolar patients and 500 normal controls and all were genotyped for the rs1063843 using a PCR-RFLP method. The allele frequency of rs1063843 was significantly different in both schizophrenia and bipolar patients comparing to control group. For the first time, we showed that rs1063843 is highly associated with bipolar disorder, although more replication studies are needed to confirm our findings. Our results also support the findings of previous studies suggesting a significant association between rs1063843 and schizophrenia.
Assuntos
Transtorno Bipolar/genética , Quinase da Proteína Quinase Dependente de Cálcio-Calmodulina/genética , Predisposição Genética para Doença/genética , Adulto , Povo Asiático/genética , Feminino , Frequência do Gene , Genótipo , Humanos , Irã (Geográfico) , Masculino , Pessoa de Meia-Idade , Polimorfismo de Fragmento de Restrição , Polimorfismo de Nucleotídeo Único , Esquizofrenia/genéticaRESUMO
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.
