Candidate Gene Screening for 6-14 Year Old Patients With ADHD (Attention Deficit/ Hyperactivity Disorder) View Homepage


Ontology type: schema:MedicalStudy     


Clinical Trial Info

YEARS

2016-2017

ABSTRACT

Source: Sample bank of Xijing Hospital and Children's Hospital Affiliated to Soochow University; Sample form: Whole blood; Estimated number of samples: 100 patients with ADHD and age, sex matched healthy controls; Case exclusion criteria: all kinds of neuropsychiatric disorders, IQ value of less than 70; Study protocol: 1. Using Qiagen kit to extract the genomic DNA of 200 microliters of blood. 2. UV spectrophotometer test DNA purity of 260/280 close to 1.8 (1.8 ± 0.05), the concentration of 100ng/μL or more before the next sequencing. 3. The extracted genomic DNA will be sent to Sangon Biology Engineering Limited Company (Shanghai) and sequenced to find candidate mutations related to ADHD risk sequence. According to NIH gene database, the longest transcript of NDRG2 (ID: 57447 gene, https://www.ncbi.nlm.nih.gov/nuccore/NC_000014.9? Report=genbank&from=21016763&to=21070872&strand=true) (a total of 17 exons and 16 introns and the gene 5 'UTR and 3' UTR region) will be alignmented sequences to find potential mutations. 4. Using the chi square analysis and other statistical methods to determine the relationship between the mutations and susceptibility to ADHD. Detailed Description Source: Sample bank of Xijing Hospital and Children's Hospital Affiliated to Soochow University; Sample form: Whole blood; Estimated number of samples: 100 patients with ADHD and age, sex matched healthy controls; Case exclusion criteria: all kinds of neuropsychiatric disorders, IQ value of less than 70; Study protocol: 1. Using Qiagen kit to extract the genomic DNA of 200 microliters of blood. (1) melt frozen blood at room temperature; (2) take the blood of 0.2 ml into a sterile anti coagulation centrifuge tube, add an equal volume of PBS phosphate buffer, after fully mixing 12000rpm centrifugation 5min, discard supernatant; (3) 66.7 L STE 2.4 L, 20% SDS, 37 DEG C water bath 1h; (4) protease K plus 1 20mg/ml l mix, 55 DEG C water bath digestion overnight (10 ~ 14h); (5) the digested samples treated with Tris saturated phenol, shake well, 12000rpm centrifugal 10min; (6) the upper aqueous phase to a sterile centrifuge tube; adding volume of Tris saturated phenol, shake well, 12000rpm centrifugal 10min; (7) the upper aqueous phase was transferred to another sterile centrifuge tube, and an equal volume of phenol was added: chloroform: isoamyl alcohol (25: 24: 1). The oscillation of the vortex was fully mixed, and the 12000rpm was centrifuged to 10min; (8) the upper aqueous phase was transferred to another sterile centrifuge tube, and an equal volume of chloroform was added: iso amyl alcohol (24: 1), which was fully vibrated and mixed with 12000rpm centrifugation 10min; (9) transfer the supernatant to another sterile centrifuge tube; adding 2 times volume ethanol, the volume level of sodium acetate 1/10 shake, until the flocculent precipitation of DNA visible; (10) the sample is placed at -20 DEG C refrigerator freezer 30min or ice bath for 15 ~ 20min, after removal of 12000rpm centrifugal 10min again, so that DNA precipitation; (11) the gun head will pick DNA to another sterile centrifugal tube, with the amount of 70% ethanol washing and shaking, to wash out impurities DNA; (12) out of ethanol, DNA by vacuum drying or dry naturally, TE buffer adding dissolution, -20 stored at standby. 2. UV spectrophotometer test DNA purity of 260/280 close to 1.8 (1.8 ± 0.05), the concentration of 100ng/μL or more before the next sequencing. 3. The extracted genomic DNA will be sent to Sangon Biology Engineering Limited Company (Shanghai) and sequenced to find candidate mutations related to ADHD risk sequence. According to NIH gene database, the longest transcript of NDRG2 (ID: 57447 gene, https://www.ncbi.nlm.nih.gov/nuccore/NC_000014.9? Report=genbank&from=21016763&to=21070872&strand=true) (a total of 17 exons and 16 introns and the gene 5 'UTR and 3' UTR region) will be alignmented sequences to find potential mutations. 4. Using the chi square analysis and other statistical methods to determine the relationship between the mutations and susceptibility to ADHD. More... »

URL

https://clinicaltrials.gov/show/NCT03018574

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