A Study on the Association Between Siglec-1 Gene Polymorphism and Susceptibility in Patients with Chronic Obstructive Pulmonary Disease in Luohe Area

Objective:To analyze the association between Siglec-1 gene polymorphism and susceptibility to chronic obstructive pulmonary disease(COPD)in the population of the Luohe area.Methods:A case-control study(150 COPD patients and 150 healthy controls)was conducted to analyze the Siglec-1 allele in two groups of individuals using single nucleotide polymorphism(SNP)high-throughput detection technology,and the frequencies of each allele were compared.Results:The frequency of rs611847 heterozygous A/G genotype in COPD patients was significantly lower in females than in healthy controls(OR=0.282,95%CI=0.085-0.938,P=0.039);among smokers,the frequency of rs3859664 and rs6084444 genotypes in COPD patients was significantly higher than that in the healthy control group(OR=2.028,95%CI=1.111-3.704,P=0.021;OR=1.836,95%CI=1.033-3.262,P=0.038).Conclusion:Among the COPD population in the Luohe area,there is a significant correlation between the genotypes of three SNPs loci,rs3859664,rs6084444,and rs611847 and susceptibility to COPD in different subgroups of the population.The rs3859664 A/G-A/A and rs6084444 A/G-G/G genotypes can increase the risk of COPD in smokers;the rs611847 heterozygous A/G genotype can reduce the risk of COPD in both female and smoking populations.

APC and K-ras gene mutation in aberrant crypt foci of human colon

AIM:To study the genetic alteration in ACF and to define the possibility that ACF may be a very early morphological lesion with molecular changes,and to explore the relationship between ACF and colorectal adenoma even carcinoma. METHODS: DNA from 35 CRC, 15 adenomas, 34 ACF and 10 normal mucus was isolated by means of microdissection. Direct gene sequencing of K-ras gene including codon 12, 13 and 61 as well as the mutation cluster region (MCR) of APC gene was performed. RESULTS: K-ras gene mutation frequency in ACF, adenoma and carcinoma was 17.6% (6/34), 13.3% (2/15), and 14.3% (5/35) respectively, showing no difference (P 】 0.05) in K-ras gene mutation among three pathologic procedures. The K-ras gene mutation in adenoma, carcinoma and 4 ACF restricted in codon 12 (GGT GAT), but the other 2 mutations from ACF located in codon 13 (GGC GAC). K-ras gene mutation was found more frequently in older patients and patients with polypoid cancer. No mutation in codon 61 was found in the three tissue types. Mutation rate of APC gene in adenoma and carcinoma was 22.9% (8/35) and 26.7% (4/15), which was higher than ACF (2.9%) (P 【0.05). APC gene mutation in carcinoma was not correlated with age of patients, location, size and differentiation of tumor. CONCLUSION: ACF might be a very early morphological lesion in the tumorogenesis of colorectal tumor. The morphological feature and gene mutation status was different in ACF and adenoma. ACF is possibly putative microadenoma that might be the precursor of adenoma. In addition, the development of a subgroup of colorectal carcinomas might undergo a way of normal epithelium ACF carcinomas .

Cytochrome P450 2E1 genetic polymorphism and gastric cancer in Changle,Fujian Province

AIM: Genetic polymorphism in enzymes of carcinogen metabolism has been found to have the influence on the susceptibility to cancer. Cytochrome P450 2E1 (CYP2E1) is considered to play an important role in the metabolic activation of procarcinogens such as N-nitrosoamines and low molecular weight organic compounds. The purpose of this study is to determine whether CYP450 2E1 polymorphisms are associated with risks of gastric cancer. METHODS: We conducted a population based case-control study in Changle county, Fujian Province, a high-risk region of gastric cancer in China. Ninety-one incident gastric cancer patients and ninety-four healthy controls were included in our study. Datas including demographic characteristics, diet intake, and alcohol and tobacco consumption of individuals in our study were completed by a standardized questionnaire.PCR-RFLP revealed three genotypes:heterozygote (C1/C2) and two homozygotes (C1/C1 and C2/C2) in CYP2E1. RESULTS: The frequency of variant genotypes (C1/C2 and C2/C2) in gastric cancer cases and controls was 36.3% and 24.5%, respectively. The rare homozygous C2/C2 genotype was found in 6 individuals in gastric cancer group(6.6%), whereas there was only one in the control group (1.1%). However, there was no statistically significant difference between the two groups (two-tailed Fisher's exact test P=0.066). Individuals in gastric cancer group were more likely to carry genotype C1/C2 (odds ratio, OR=1.50) and C2/C2 (OR=7.34) than individuals in control group (chi(2) =4.597, for trend P=0.032). The frequencies of genotypes with the C2 allele (C1/C2 and C2/C2 genotypes) were compared with those of genotypes without C2 allele (C1/C1 genotype) among individuals in gastric cancer group and control group according to the pattern of gastric cancer risk factors. The results show that individuals who exposed to these gastric cancer risk factors and carry the C2 allele seemed to have a higher risk of developing gastric cancer. CONCLUSION: Polymorphism of CYP2E1 gene may have some effect in the development of gastric cancer in Changle county, Fujian Province.

Association of Graves’ disease and Graves’ ophthalmopathy with the polymorphisms in promoter and exon 1 of cytotoxic T lymphocyte associated antigen-4 gene

Objective: To investigate the association of Graves’ disease and Graves’ ophthalmopathy with the C/T transition polymorphism at position –318 of promoter and the A/G transition polymorphism at position 49 of exon 1 within cytotoxic T lymphocyte associated antigen-4 (CTLA-4) gene. Methods: Thirty-three patients with ophthalmopathy of Graves’ disease, fifty-six Graves’ patients without ophthalmopathy and sixty normal subjects as control were involved in the present case-control study. The polymorphisms were evaluated by polymerase chain reaction fragment length polymorphism (PCR-RFLP). Com-parisons were made of gene frequencies and allele frequencies between the groups. Results: The gene frequencies of CT and allele frequencies of T were much higher in Graves’ patients with ophthalmopathy than that in the group without ophthalmopathy (P=0.020, P=0.019). The gene frequencies of GG and allele frequencies of G in patients with Graves’ disease were significantly increased as compared with control group (P=0.008, P=0.007). The data suggest that smokers with Graves’ disease seemed to be more predisposed to ophthalmopathy than non-smokers (P=0.018). Conclusion: Our results suggest that an allele of T at position –318 of promoter is associated with genetic susceptibility to Graves’ ophthalmopathy while an allele of G at position 49 of exon 1 is associated with genetic susceptibility to Graves’ disease instead. Smoking is believed to be a major risk factor for ophthalmo-pathy.

Genetic screening of 5 blood group systems of Li ethnic group in Hainan province and establishment of rare blood group bank

Objective:To screen the blood group system genes of Duffy,Lutheran,Kidd,Diego,Dombrock blood group systems of Li ethnic group in Hainan Province and provide laboratory data for the rare blood group database in this area.Methods:The alleles of Duffy,Lutheran,Kidd,Diego,Dombrock blood group systems of 300 voluntary participants of Li ethnic group in Hainan were detected by sequence-specific primer polymerase chain reaction,and the polymorphism was analyzed.Results:The allele frequencies of Duffy,Lutheran,Kidd,Diego,Dombrock blood group systems of Li ethnic groups in Hainan Province are 0.9583 for Fy^(a),0.0417 for Fy^(b),0.8350 for Au^(a),0.1650 for Au^(b),0.4500 for Jk^(a),0.5500 for Jk^(b),0.0667 for Di^(a),0.9333 for Di^(b),0.1017 for Doa and 0.8983 for Dob,respectively.The antigen incompatibility rates of Fy^(a)/Fy^(b),Au^(a)/Au^(b),Jk^(a)/Jk^(b),Di^(a)/Di^(b),Doa/Dob of Duffy,Lutheran,Kidd,Diego,Dombrock blood group systems were 7.67%,23.76%,37.25%,11.67%and 16.60%,respectively.Conclusion:The gene frequencies of Duffy,Lutheran,Kidd,Diego,Dombrock blood group systems of Li ethnic group in Hainan Province are polymorphic,and the antigen incompatibility rates of alleles are higher,which is quite different from that of other nationalities in China and with unique ethnic distribution characteristics.It is of great significance to establish the rare blood group database in this region.

Elimination Mechanism and Equilibrium Model about Complete Linkage of Panmixis Based on Fitness

[Objective]The aim was to discuss elimination mechanism and equilibrium model about complete linkage gene of panmixis based on fitness.[Method]A mathematical model that gsgenerational evalution of frequency of panmixis two pairs of complete linkage gene under difference fitness was built by using difference equations to study elimination mechanism and genetic equilibrium state of panncticcoinplete linkage gene.[Result]The panmixis is different from Hardy-Weinberg Equilibrium which reached the equilibrium just by one generation.A method that by using linear equation to calculate the frequency of four gametes and the fitnessed of panmixis was established after detormining is the fitness of 10 genotypes the necessary and sufficient condition of the panmixis to reach balance.[Conclusion]The method is valuable for reference on linkage disequilibrium and hitchhiking effect study.

Relationship between ABO blood groups and carcinoma of esophagus and cardia in Chaoshan inhabitants of China

AIM:To study the relationship between ABO blood groups and carcinoma of esophagus and cardia in Chaoshan inhabitants of China, which is a unique Littoral high-risk area of esophageal carcinoma in China. The poor communication and transportation in the past has made Chaoshan a relatively closed area and kept its culture and custure of old China thousand years ago. METHODS: Data on age, sex, ABO blood type and X-ray or pathological diagnose of the patients with carcinoma of esophagus or cardia were collected from the Tumor Hospital. First Affiliated Hospital, Second Affiliated Hospital of Shantou University Medical College; and the Central Hospital of Shantou and the Central Hospital of Jieyang. A total of 6685 patients with esophageal carcinoma (EC) and 2955 patients with cardiac cancer (CC) in Chaoshan district were retrospectively assessed for their association with ABO blood groups. RESULTS: The distribution of ABO blood groups in patients with EC or CC was similar to the normal local population in Chaoshan. However, blood group B in male patients with CC and in the patients with carcinoma in the upper third esophagus was 2.3% and 4.7% higher than the corresponding controls. The relative risk B O was 1.1415 (P【0.05) and 1.2696 (P【0.05), respectively. No relationship was found between ABO blood groups and tumor differentiation. CONCLUSION: ABO blood group B is associated with the incidence of CC in male individuals and carcinoma in the upper third esophagus. The distribution of ABO blood groups varies in the different geographical and ethnic groups. As a result, proper controls are very important for such studies.

PCR analysis of Yq microdeletions in infertile males, a study from South India

AIM: To estimate the frequency of microdeletions in the long arm of Y-chromosome of 20 infertile males from South India. METHODS: Polymerase chain reaction (PCR) amplification using Y-specific STS of azoospermia factor (AZF) regions i.e., SY 84 for AZFa, SY 127 for AZFb and SY 254 for AZFc. RESULTS: Of the 20 infertile subjects 3 (15 %), one azoospermic and two oligozoospermic, showed microdeletions in the AZF region of Y-chromosome. CONCLUSION: The frequency of deletions involving AZF region of the Y-chromosome is 15 % in azoospermic and severely oligozoospermic infertile men. PCR amplification of AZF locus is useful for the diagnosis of microdeletions in the Y-chromosome.

Comparison of STR polymorphism among a Kirgiz ethnic group from Sinkiang and other groups

Objective To study the genetic relationship between Kirgiz individuals living in Sinkiang China and analyze the difference among Kirgiz and the other population with STR polymorphisms.Methods PCR amplification was performed using PE9700,the PCR products were typed by automated sequencer and genescan.Results A database of nine STR loci of Kirgiz was established.It shows there are at least 73 STR alleles and 191 genotypes in Kirgiz.Genotype frequencies distribution showed no deviation from Hardy-Weinberg equilibrium by χ2-test.Kirgiz was compared with the other Chinese ethnic groups,then the American Black and the White.Conclusion These results suggested that the nine STR loci and Amelogenin locus were very useful in human identification,biological archaeology and gene resource studies.

Genetic background of idiopathic neurodevelopmental delay patients with significant brain deviation volume

Background:Significant brain volume deviation is an essential phenotype in children with neurodevelopmental delay(NDD),but its genetic basis has not been fully characterized.This study attempted to analyze the genetic factors associated with significant whole-brain deviation volume(WBDV).Methods:We established a reference curve based on 4222 subjects ranging in age from the first postnatal day to 18 years.We recruited only NDD patients without acquired etiologies or positive genetic results.Cranial magnetic resonance imaging(MRI)and clinical exome sequencing(2742 genes)data were acquired.A genetic burden test was performed,and the results were compared between patients with and without significant WBDV.Literature review analyses and BrainSpan analysis based on the human brain developmental transcriptome were performed to detect the potential role of genetic risk factors in human brain development.Results:We recruited a total of 253 NDD patients.Among them,26 had significantly decreased WBDV(<-2 standard deviations[SDs]),and 14 had significantly increased WBDV(>+2 SDs).NDD patients with significant WBDV had higher rates of motor development delay(49.8%[106/213]vs.75.0%[30/40],P=0.003)than patients without significant WBDV.Genetic burden analyses found 30 genes with an increased allele frequency of rare variants in patients with significant WBDV.Analyses of the literature further demonstrated that these genes were not randomly identified:burden genes were more related to the brain development than background genes(P=1.656e^(-9)).In seven human brain regions related to motor development,we observed burden genes had higher expression before 37-week gestational age than postnatal stages.Functional analyses found that burden genes were enriched in embryonic brain development,with positive regulation of synaptic growth at the neuromuscular junction,positive regulation of deoxyribonucleic acid templated transcription,and response to hormone,and these genes were shown to be expressed in neural progenitors.Based on single cell sequencing analyses,we found TUBB2B gene had elevated expression levels in neural progenitor cells,interneuron,and excitatory neuron and SOX15 had high expression in interneuron and excitatory neuron.Conclusion:Idiopathic NDD patients with significant brain volume changes detected by MRI had an increased prevalence of motor development delay,which could be explained by the genetic differences characterized herein.

Genetic variation of mannose-binding protein associated with glomerular immune deposition in IgA nephropathy

OBJECTIVE: To investigate the relationship between codon 54 gene polymorphism of the host defense molecule, mannose-binding protein (MBP), and the patterns of glomerular immune deposition in IgA nephropathy (IgAN). METHODS: IgAN patients with different patterns of glomerular immune deposition were selected and divided into two groups. Group A consisted of 77 patients with glomerular IgA and C3 deposits, and Group AGM consisted of 70 patients with glomerular IgA, IgG, IgM, C3 and Clq deposits. Clinical features and laboratory relevant data of all patients were collected. One-hundred and forty healthy adults were recruited as normal controls. The MBP gene codon 54 GGC/GAC polymorphism was investigated by using polymerase chain reaction and restriction fragment length polymorphism. RESULTS: The genotype frequency of GGC/GAC heterozygotes was significantly higher in Group AGM as compared with that of Group A (41.4% vs 19.5%, P

Relationship between a novel polymorphism of lipoprotein lipase gene and coronary heart disease

OBJECTIVE: To investigate polymorphisms in the gene for lipoprotein lipase (LPL) in Chinese populations with coronary heart disease (CHD) and to inquire into the relationship between these polymorphisms in LPL gene and CHD. METHODS: Genomic DNA was extracted from patients with CHD and normal control subjects using a salting out method. The entire coding region and flanking sequences of all coding exons of the LPL gene were amplified by PCR technique and PCR products were detected by denaturing high-performance liquid chromatography (DHPLC) and sequenced with a dideoxy terminal termination method. RESULTS: A novel polymorphic site, G830A, that is within the fifth exon of the LPL gene was found. The 192 codon CGA was changed into CAA and resulted in the substitution of glutamine for arginine. Between the control and CHD groups, chi-square test showed no significant difference in the frequencies of the A/A genotype and A allele (P > 0.05). However, the frequencies of A/A genotype and A allele (0.653 and 0.786) in CHD patients with high plasma triglyceride/lowed plasma high density lipoprotein cholesterol were higher than those (0.415 and 0.642) in CHD patients without hyperlipidemia (P Gln substitution polymorphism and CHD, but there is a significant positive correlation between the A/A genotype of the LPL gene and CHD associated with high triglyceride/lowed high density lipoprotein cholesterol. This study may provide new data for exploring the molecular mechanism of CHD.

β-fibrinogen gene -455A/G polymorphism and plasma fibrinogen level in Chinese stroke patients

Abstract Objectives To investigate the relationship between the β-fibrinogen gene -455A/G polymorphism and plasma fibrinogen level and to determine the influence of the mutation on ischemic stroke. Methods Ninety-one patients (63.5±10.1 years) with ischemic stroke and 74 elderly control subjects (60.6±10.8 years) without any thromboembolic events and 98 healthy blood donators as young control (37.5±13.3 years) were enrolled in this trial. The β-fibrinogen gene -455A/G polymorphism was analyzed for all subjects by PCR-RFLP with the restrictive enzyme Hae Ⅲ, while plasma fibrinogen levels were obtained from the prothrombin time (PT) assay. For statistical analysis, the parameters were compared between any two different groups by the unpaired Student’s t test and the Chi-square test. Before analysis, log transformations for concentrations of fibrinogen were carried out.Results H2 allele frequency was higher in male ischemic stroke patients than in the elderly control (22.7% vs 7.1%, χ 2=5.56, P【0.02). There was no significant difference between the female groups. In those patients without any thromboembolic events (both elderly and young control groups), the frequency of H2 decreased with age (≤40, 21.3%; 41-59, 15.4%; and ≥60, 10.2%). In the male elderly and young control groups, the level of plasma fibrinogen was lower in the H1H1 genotype (287±96*!mg/dl and 234±58*!mg/dl) than in H1H2 and H2H2 (331±44*!mg/dl and 307±55*!mg/dl; t=2.53 and 9.67, P【0.05). In the female elderly groups, this tendency was not found.Conclusion Plasma fibrinogen expression is affected by the β-fibrinogen gene -455A/G polymorphism, and the H2 allele may be a risk factor for ischemic stroke in Chinese males.

Association between cholesteryl ester transfer protein gene polymorphisms and variations in lipid levels in patients with coronary heart disease

BACKGROUND: The Taq/B, Msp/ and I405V polymorphisms of cholesteryl ester transfer protein (CETP), an important regulatory factor of lipid metabolism, have been attracted much more attention by the researchers. In this study, we investigated the associations between these 3 polymorphisms of CETP gene and variations in plasma lipid and lipoprotein levels in patients with coronary heart disease (CHD). METHODS: Genomic DNA was extracted from leukocytes of 203 CHD patients and 100 control subjects using the salting out method. Genotyping of the CETP gene was performed using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) techniques. Statistical analysis was conducted using the SPSS 10.0 software package. RESULTS: The distribution of allele and genotype frequencies of the Taq/B, MspI, and I405V polymorphisms was similar in the CHD patient group and the control group. The B1B1 genotype of the Taq/B polymorphism was associated with significantly higher TC (P=0.039) and LDL-C (P=0.044) levels than the B2B2 genotype in CHD patients, and with significantly higher LDL-C (P=0.034) levels than the B2B2 genotype in controls. Homozygotes of the I405V polymorphism exhibited significantly higher HDL-C levels than VV homozygotes among control subjects (P=0.023). In male CHD patients with unambiguously assigned haplotypes, B2-M2-V/B2-M2-I patients demonstrated significantly higher HDL-C concentrations than B1-M2-V/B1-M2-I (P=0.023) and B1-M2-V/B1-M2-V patients (P=0.047). CONCLUSIONS: Genetic variations in the CETP gene may account for a significant proportion of the differences in plasma lipid and lipoprotein concentrations among the general population. The B1B1 genotype of the Taq/B polymorphism is probably a genetic risk factor for CHD in the study population.

Gene frequency of five genetic characteristics in six nationalities in Southern Guizhou Province,China

Five characteristics(hair forms,nasal profile,nostril forms,mongoloid fold and upper eyelid fold)were respectively investigated in six nationalities,including the Buyi,Miao,Shui,Maonan,Dong,and Han nationalities in Southern Guizhou,China.The gene frequencies of five characteristics in the six nationalities were estimated and compared.The results indicated that:(1)for hair forms and nasal profile,the frequency of the dominant gene was lower than that of their recessive gene,but the opposite was true for nostril forms.(2)Among different nationalities,the difference of gene frequency of the mongoloid fold,nasal profile,hair forms and upper eyelid fold was quite significant,which was followed by that of nostril forms.

Prevalence and gene frequency of color vision impairments among children of six populations from North Indian region

X-linked redegreen color blindness is the most widespread form of vision impairment.The study aimed to determine the prevalence and gene frequencies of redegreen color vision impairments among children of six different human populations of Jammu province.A total of 1028 healthy subjects(6e15 years of age)were selected from five Muslim populations and the color vision impairments were determined using the Ishihara’s test of color deficiency.The gene frequency was calculated using HardyeWeinberg equilibrium method.The prevalence of color vision deficiency(CVD)ranged from 5.26%to 11.36%among males and 0.00%e3.03%among females of six different populations.The gender based differences in the frequency of CVD was found to be statistically significant(p<0.0001),with a higher prevalence among male(7.52%)as compared to female(0.83%)children.We observed high frequency of deutan as compared to protan defects.The incidences of deuteranomaly(5.68%)and deuteranopia(2.27%)were higher among male children of Syed population while the frequencies of protanomaly(1.94%),protanopia(1.28%)and achromacy(2.27%)were the highest among male subjects of Khan,Malik and Syed populations,respectively.The allele and genotype frequencies showed cogent differences among six populations.The population based assessment of CVDs help patients to follow adaptive strategies that could minimize the risks of the disease.

Linkage analysis of a region on chromosome 2 with essential hypertension in Chinese families

OBJECTIVE: To verify the linkage of the candidate regions identified in a previous study (markers D2S168, D2S151, D2S142 on chromosome 2) with hypertension in Chinese families. METHODS: A genetic linkage study focused on chromosome 2 was performed on 240 Chinese families containing 856 patients with essential hypertension. A total of 1080 individuals were genotyped using 9 highly polymorphic microsatellite markers around the candidate regions on chromosome 2 with an average spacing of 5 cM. Non-parametric linkage (NPL), parametric linkage analysis and transmission-disequilibrium test (TDT) with the GENEHUNTER software were used to assess evidence for linkage. RESULTS: Linkage of a region on chromosome 2 around D2S151 and D2S142 with hypertension was confirmed by different statistical methods (NPL, LOD score and TDT). However, the linkage of D2S168 could not be replicated in this extension study. CONCLUSIONS: The data suggest that a region on chromosome 2 at or near the loci of D2S142 and D2S151 may harbor genes responsible for the development of essential hypertension in Chinese.

High frequency loss of heterozygosity on the long arms of chromosomes 13 and 14 in nasopharyngeal carcinoma in Southern China

OBJECTIVE: To investigate the loss of heterozygosity (LOH) on chromosomal arms 13q and 14q in nasopharyngeal carcinoma (NPC) using 21 microsatellite polymorphic markers and to study whether there is a correlation between LOH and clinicopathologic parameters and/or Epstein-Barr virus (EBV) infection in NPC. METHODS: Sixty cases of NPC were studied using polymerase chain reaction based microsatellite analysis with genescan and genotyping techniques. RESULTS: LOH was detected on 13q in 78% of NPC tumors, high frequency LOH loci (more than 30%) clustered to 13q12.3-q14.3 and 13q32. On chromosome 14q, LOH was detected in 80% of NPC tumors; high frequency LOH loci clustered to 14q11-q13, 14q21-q24 and 14q32. High frequency LOH at 13q31-q32 correlated with a lower level of EBV infection; LOH on chromosome 14q was closely associated with poor differentiation of NPC tumor cells. CONCLUSION: Our results suggest that in NPC, LOH on chromosome 13q and 14q are common genetic events, and putative tumor suppressor genes (TSG) residing in these regions may be involved in tumorigenesis.