Gene Polymorphism Associated With Macroangiopathy in Type 2 Diabetes Patients
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|ClinicalTrials.gov Identifier: NCT02882945|
Recruitment Status : Completed
First Posted : August 30, 2016
Last Update Posted : August 30, 2016
|Condition or disease||Intervention/treatment|
|Diabetic Angiopathies||Other: Group A Other: Group B Other: Group C|
Previous studies examining the molecular etiology of diabetes mellitus in China and abroad have mainly focused on the relationship between HLA and type 1 diabetes mellitus (DM) (1-3). Due to the complexity of type 2 DM heredity, few researchers have studied the correlation between type 2 DM and HLA. In recent years, it has been suggested that the development of coronary heart disease (CHD) in diabetic individuals is not merely a complication of diabetic macroangiopathy. CHD and diabetic macroangiopathy share some genetic associations. Previous studies have demonstrated that certain HLA*DRB1*04 subtypes are associated with an increased risk of cardiovascular disease.
Experimental methods: For genomic DNA extraction, 3-5ml venous blood samples were collected from all patients. Coagulation was prevented using EDTA.
The procedure for PCR amplification was as follows: denaturing for 100s at 96°C, annealing for 60s at 63°C, 1 cycle; denaturing for 10s at 96°C, annealing for 60s at 63°C, 9 cycles; denaturing for 10 s at 96°C, annealing for 30 s at 59°C; extending for 30 s at 72°C, 20 cycles; maintaining at 4°C. Analyzing PCR products stained by Ethidium Bromide on 2.5% agarose gel electrophoresis. Bands were observed using an ultraviolet light and a biological imaging system.
Statistical method: The degree of agreement with Hardy-Weinberg equilibrium was determined using the χ2 test. A t-test was employed for comparison of CRP levels (M ± s) and a χ2 test was performed to compare allelic frequencies. The relative risk rate (RR) was calculated as (Number of patients with the gene×Number of people in control group without the gene) divided by (Number of people in control group with the gene×Number of the patients without the gene). PC was calculated using Fisher's method if χ2 > 3.84.
|Study Type :||Observational|
|Actual Enrollment :||470 participants|
|Observational Model:||Case Control|
|Official Title:||Polymorphism Analysis of HLA-DRB1*04 Alleles in Patients With Type 2 Diabetic Macroangiopathy in Northeast Chinese|
|Study Start Date :||May 2015|
|Actual Primary Completion Date :||August 2015|
|Actual Study Completion Date :||September 2015|
150 healthy blood donors without a family history of diabetes mellitus
Other: Group A
150 healthy blood donors without a family history of diabetes mellitus were enrolled in the study.
Other Name: healthy blood donors
200 cases of type 2 DM without complications (group B), there were 62 males and 108 females, aged 29-53, with an average age of 42 ± 9 years
Other: Group B
200 cases of type 2 DM without complications were enrolled in the study.
Other Name: type 2 DM without complications
120 cases of type 2 DM with macroangiopathy complication (group C), there were 70 males and 50 females, aged 40-53, with an average age of 47 ± 6 years. Among the group C subjects, 65 individuals had CHD; 55 patients had cerebrovascular disease (CVD); and 30 subjects had a combination of peripheral vascular diseases (PVD) and CHD
Other: Group C
120 cases of type 2 DM with macroangiopathy complication were enrolled in the study.. Among the group C subjects, 65 individuals had CHD; 55 patients had cerebrovascular disease (CVD); and 30 subjects had a combination of peripheral vascular diseases (PVD) and CHD.
Other Name: type 2 DM with macroangiopathy complication
- Test of allelic frequencies [ Time Frame: At recruitment ]A commercially available kit was used for extraction of genomic DNA from the whole blood samples (PEL-FREEZ Inc., USA). Thirty-two pairs of sequence-specific primers (SSP) for HLA-DRB1*04 alleles were purchased from One Lambda, Inc. (USA), and the Taq enzyme was purchased from Promega Corp. (USA). The PCR-SSP technique was employed to determine the HLA-DRB1*04 alleles for each subject. Genes were amplified using the 5700 PCR thermal cycler manufactured by Applied Biosystems Inc. (USA).
- Evaluation of serum CRP(C-reactive protein) levels [ Time Frame: At recruitment ]A commercially available 96-well plate ELISA assay kit (introassay CV 1.7%~3.9%, interassay CV 2.8%~5.1%) was used to quantify hs-CRP in serum (DSL Inc., USA). All samples were evaluated in duplicate. The absorbance (OD) was determined using a BIO-RAD2550 microwell plate reader (USA).
Biospecimen Retention: Samples With DNA
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Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02882945
|Principal Investigator:||Nan Ma, Master||First Affiliated Hospital of Harbin Medical University|