ABSTRACT
<p><b>OBJECTIVE</b>To explore the molecular genetic relationship between chromosome 1 and susceptibility genes for familial schizophrenia in Chinese population.</p><p><b>METHODS</b>A genome scanning was conducted in 32 multiplex pedigrees from Chinese population by using 29 microsatellite markers on chromosome 1.</p><p><b>RESULTS</b>Multipoint parametric analysis detected a maximum heterogenicity Lod of 1.70 at 262.52 cM under a recessive model; multipoint non-parametric analysis detected a maximum non-parameter linkage (NPL) of 1.71 (P=0.046) at 262.52 cM, then 1.37 (P=0.086) at 149.70 cM, corresponding to marker D1S206 and D1S425 respectively.</p><p><b>CONCLUSION</b>These results give further supports to the presence of susceptibility genes on chromosome 1q for familial schizophrenia.</p>
Subject(s)
Adult , Female , Humans , Male , Middle Aged , China , Chromosome Mapping , Chromosomes, Human, Pair 1 , Genetics , Family Health , Genetic Linkage , Genetic Predisposition to Disease , Genetics , Lod Score , Microsatellite Repeats , Models, Genetic , Pedigree , Schizophrenia , GeneticsABSTRACT
<p><b>OBJECTIVE</b>To explore the molecular genetic relationship between chromosome 1 and quantitative trait loci for familial schizophrenia.</p><p><b>METHODS</b>A series of assessment scales included positive and negative syndrome scale (PANSS), global assessment of functional scale (GAFS), premorbid schizoid and schizotypal traits scale (PSST), premorbid social adjustment scale (PSA) were applied to quantify the phenotypes of schizophrenia. Non-parametric linkage analysis of quantitative traits was conducted in 32 multiplex pedigrees with schizophrenia by using 29 microsatellite makers on chromosome 1.</p><p><b>RESULTS</b>Haseman-Elston quantitative trait analysis detected a maximum Traditional H-E Lods of 1.73 and a maximum EH H-E Lods of 1.65 of negative symptoms (PANSS-N ) at 147.64 cM, which was overlapped to the positive region of 1q21-23 in qualitative linkage analysis.</p><p><b>CONCLUSION</b>The results suggest there might be an independent quantitative trait locus of negative symptoms on 1q21-23 for familial schizophrenia.</p>
Subject(s)
Humans , Chromosomes, Human, Pair 1 , Genetics , Family Health , Genetic Linkage , Lod Score , Microsatellite Repeats , Quantitative Trait, Heritable , Schizophrenia , GeneticsABSTRACT
<p><b>OBJECTIVE</b>To understand the mutational patterns and mechanism of short tandem repeats(STRs).</p><p><b>METHODS</b>The DNA samples of 19 parent-child pairs with mutations in three loci (FGA, D12S391, and D11S554) were genotyped by silver staining on STR. Alleles to be sequenced were excised from gels, reamplified by PCR, and purified. Sequencing was performed by use of cycle sequencing.</p><p><b>RESULTS</b>There were 18 out of 19 pedigrees in which the 'new' alleles gained or lost a single repeat (8 gains, 7 losses, and 3 being indistinguishable). Only one pedigree lost two repeats. In the 19 pedigrees, there were 13 pedigrees whose 'new' alleles came from fathers, 3 from mothers, 3 from either father or mother. The ratio was 4 1 between fathers and mothers. The mutation of three STR loci occurred in the long, uninterrupted tetranucleotide repeat regions ('CTTT' in FGA, 'AGAT' in D12S391, and 'AAAG' in D11S554).</p><p><b>CONCLUSION</b>Single- step mutations accounted for 95% of STR mutation events in these three loci: FGA, D12S391, and D11S554. The rest were double step mutations. There was no insertion or deletion of an incomplete repeat in any of the pedigrees. The mutation was mainly caused by fathers. The long, uninterrupted tetranucleotide repeats in these three loci might be susceptible to mutation.</p>
Subject(s)
Female , Humans , Male , Alleles , Base Sequence , DNA , Chemistry , Genetics , DNA Mutational Analysis , Gene Frequency , Genotype , Microsatellite Repeats , Genetics , Mutation , Nuclear Family , Tandem Repeat Sequences , GeneticsABSTRACT
【Objective】To explore the optimal conditions in fingerprinting (APHDF).【Methods】The human DNA fingerprints were detected by APHDF.A pair of short primers was used for amplification.The experimental conditions including template,Mg2+,deoxyribonucleotides,and parameters of cycle,were optimized.【Results】The template DNA should be abstracted freshly and the concentration should be ranged from 50～550 mg/L.The best concentration of Mg2+was 5.0 mmol/L.The deoxyribonucleotides concentration was optimal at 0.2 mmol/L.The PCR cycling parameters were as follows :The denaturing temperatures,annealing temperatures and extension temperatures were 94 ℃ and 90 ℃ for 30 s,43 ℃ and 48 ℃ for 40 s or 50 s,and 72 ℃ for 1 min or 80 s,respectively.【Conclusion】The optimal conditions of the experiment are obtained,with good reproducibility and high specificity.Therefore,this method can be widely applied in practice.