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Association between corticotropin-releasing hormone receptor 2 (CRHR2) gene polymorphism and personality traits.

Corticotropin-releasing hormone (CRH) has been implicated in the pathophysiology of anxiety disorders and depression. Corticotropin-releasing hormone receptor 2 (CRHR2) is one of the receptors that mediate CRH signal. The purpose of the present study was to investigate the association between the CRHR2 gene and personality traits, evaluated using the Revised NEO Personality Inventory (NEO PI-R), in 243 healthy Japanese subjects. As a result, significant association was observed between the polymorphism in intron 2 (rs2267717) and Openness (P = 0.004, uncorrected, anova), while no relationship was observed concerning Neuroticism. The present result suggests an association between CRHR2 and the personality trait of Openness.

Adult↗

Comment: the methionine 196 arginine polymorphism in exon 6 of the TNF receptor 2 gene (TNFRSF1B) is associated with the polycystic ovary syndrome and hyperandrogenism.

Inflammatory cytokines such as TNF alpha may play a role in the pathogenesis of common metabolic disorders, including hyperandrogenism and the polycystic ovary syndrome (PCOS). The TNF receptor 2 mediates most of the metabolic effects of TNF alpha. In the present study, we have evaluated serum soluble TNF receptor 2 levels, and several common polymorphisms in the TNF receptor 2 gene (TNFRSF1B), in women presenting with PCOS or hyperandrogenic disorders. Initial studies included 103 hyperandrogenic patients (42 presenting with PCOS) and 36 controls from Spain. The 196R alleles of the M196R (676 T-->G) variant in exon 6 of TNFRSF1B, which is in linkage disequilibrium with a CA-repeat microsatellite polymorphism in intron 4 of TNFRSF1B, tended to be more frequent in hyperandrogenic patients than in controls (P = 0.056), reaching statistical significance when the analysis was restricted to include only PCOS patients (P < 0.03). Extended analysis including another 11 hyperandrogenic patients from Spain and 64 patients and 29 controls from Italy confirmed the association between 196R alleles of the M196R variant and hyperandrogenic disorders (P < 0.05), which was maintained when restricting the analysis to PCOS patients (P < 0.02). On the contrary, the 3'-untranslated region (exon 10) variants 1663 G-->A, 1668 T-->G, and 1690 T-->C were not associated with hyperandrogenism. The soluble TNF receptor 2 levels were not different between patients and controls but were increased in obese subjects, compared with lean individuals, and were affected by the interaction between the 1663 G-->A and 1668 T-->G variants in the 3'-untranslated region of TNFRSF1B. The TNFRSF1B genotype did not influence any clinical or biochemical variable related to hyperandrogenism or insulin sensitivity and was not associated with obesity, both in hyperandrogenic patients and healthy controls considered separately. In conclusion, the M196R (676 T-->G) variant in exon 6 of TNFRSF1B is associated with hyperandrogenism and PCOS, further suggesting a role for inflammatory cytokines in the pathogenesis of these disorders.

Androgens↗

Lack of correlation between Mbo I restriction fragment length polymorphism of renin gene and essential hypertension in Japanese.

Predisposition to essential hypertension is associated with gene polymorphisms of the renin angiotensin system (RAS). Gene polymorphisms of the angiotensinogen and angiotensin converting enzyme genes are known to be risk factors for hypertension, while few studies concerning the renin gene polymorphism have been published. In the present investigation, we carried out a case control study using a Japanese population to examine the genetic influence of the renin gene on the predisposition to hypertension. Patients (n=235) recruited from outpatients at Osaka University Hospital and diagnosed with essential hypertension or receiving long-term antihypertensive medication participated in the study. Normotensive control subjects (n=510) without a history of hypertension and without diabetes mellitus were recruited from the same population, and were sex-matched with experimental subjects. A polymorphism in intron 9 of the human renin gene was determined as the Mbo I restriction fragment length polymorphism (Mbo I-RFLP). There was no significant association between Mbo I-RFLP of the renin gene and predisposition to essential hypertension in Japanese (p>0.05, chi2=2.1). These results suggest that the Mbo I (+) allele of the renin gene does not increase the risk for hypertension in Japanese.

Aged↗

Novel mutations in the 1alpha-hydroxylase (P450c1) gene in three families with pseudovitamin D-deficiency rickets resulting in loss of functional enzyme activity in blood-derived macrophages.

Pseudovitamin D-defiency rickets (PDDR) is an autosomal recessive disorder characterized by hypocalcemia, rickets (which are resistant to treatment with vitamin D), and low or undetectable serum levels of 1,25-dihydroxyvitamin D (1,25(OH)2D). The symptoms are corrected with 1,25(OH)2D treatment, and the disease is now believed to result from a defect in the cytochrome P450 component (P450c1; CYP27B1) of the renal 25-hydroxyvitamin D-1alpha-hydroxylase (1-OHase). We have studied genomic DNA from three families with PDDR and have identified the same homozygous mutation in the P450c1 gene in two of the index cases, causing a frameshift in exon 8, resulting in a premature stop codon in the heme-binding domain. The two cases in the third kindred were compound heterozygotes with missense mutations in exons 6 and 9. We have also identified a C/T polymorphism in intron 6 of the P450c1 genomic DNA. Interferon gamma-inducible 1-OHase activity in blood-derived macrophages was shown by 1,25(OH)2D synthesis in all control cells tested (37-184 fmol/h/106 cells) and those from the PDDR family parents (34-116 fmol/h/106 cells) but was totally absent from the patients' cells, indicating a defect in their macrophage 1-OHase, similar to the presumed renal defect. The assumption of similarity between the renal and macrophage P450c1 was supported by our ability to clone a 514 bp sequence, including the heme-binding region of the macrophage P450c1 cDNA from controls, which was identical to that published for both the renal and keratinocyte P450c1 cDNAs.

24,25-Dihydroxyvitamin D 3↗

[Study on the association between estrogen receptor alpha gene polymorphism and intrahepatic cholestasis of pregnancy].

OBJECTIVE: To investigate the relationship between estrogen receptor alpha (ERalpha) gene polymorphism and intrahepatic cholestasis of pregnancy (ICP). METHODS: The Xba I and Pvu II polymorphisms in intron 1 of ER alpha gene were detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method in 100 pregnant women with ICP (ICP group) and 100 normal pregnant women (control group). RESULTS: (1) The frequencies of XX, Xx and xx genotypes of Xba I polymorphism were 6%, 33% and 61% respectively in control group, and were 2%, 33% and 65% respectively in ICP group. There was no significant difference in the distribution of Xba I genotypes between the two groups (P > 0.05). The frequencies of the two alleles X and x were 23% and 78% in control group, and were 19% and 82% in ICP group, respectively. There was also no significant difference in the frequency of Xba I alleles between the two groups (P > 0.05). (2) The frequencies of PP, Pp and pp genotypes of Pvu II polymorphism were 18%, 42% and 40% respectively in control group, and were 12%, 53% and 35% respectively in ICP group. There was no significant difference in the distribution of Pvu II genotypes between the two groups (P > 0.05). The frequencies of the two alleles P and p were 39% and 61% in control group, and were 39% and 62% in ICP group, respectively. There was also no significant difference in the frequency of Pvu II alleles between the two groups (P > 0.05). (3) There was also no significant difference in the distribution of Xba I and Pvu II combinative genotype between the two groups (P > 0.05). CONCLUSION: The ERalpha gene polymorphism is not associated with the risk of ICP.

Adult↗

Investigation of the RH locus in gorillas and chimpanzees.

The human Rh blood-group system is encoded by two homologous genes, RhD and RhCE. The RH genes in gorillas and chimpanzees were investigated to delineate the phylogeny of the human RH genes. Southern blot analysis with an exon 7-specific probe suggested that gorillas have more than two RH genes, as has recently been reported for chimpanzees. Exon 7 was well conserved between humans, gorillas, and chimpanzees, although the exon 7 nucleotide sequences from gorillas were more similar to the human D gene, whereas the nucleotide sequences of this exon in chimpanzees were more similar to the human CE gene. The intron between exon 4 and exon 5 is polymorphic and can be used to distinguish the human D gene from the CE gene. Nucleotide sequencing revealed that the basis for the intron polymorphism is an Alu element in CE which is not present in the D gene. Examination of gorilla and chimpanzee genomic DNA for this intron polymorphism demonstrated that the D intron was present in all the chimpanzees and in all but one gorilla. The CE intron was found in three of six gorillas, but in none of the seven chimpanzees. Sequence data suggested that the Alu element might have previously been present in the chimpanzee RH genes but was eliminated by excision or recombination. Conservation of the RhD gene was also apparent from the complete identity between the 3'-noncoding region of the human D cDNA and a gorilla genomic clone, including an Alu element which is present in both species. The data suggest that at least two RH genes were present in a common ancestor of humans, chimpanzees, and gorillas, and that additional RH gene duplication has taken place in gorillas and chimpanzees. The RhCE gene appears to have diverged more than RhD among primates. In addition, the RhD gene deletion associated with the Rh-negative phenotype in humans seems to have occurred after speciation.

Amino Acid Sequence↗

Association between diabetic retinopathy and genetic variations in alpha2beta1 integrin, a platelet receptor for collagen.

Platelets might be involved in the pathogenesis of diabetic microangiopathy. Wide interindividual variations in the density of a platelet collagen receptor (alpha2beta1 integrin or glycoprotein Ia/IIa) are reportedly associated with polymorphism(s) in the gene encoding the alpha subunit of the receptor, including a Bgl II polymorphism in intron 7. The aim of the present study was to determine the relationship between the Bgl II polymorphism and the susceptibility to diabetic microangiopathy. A case-control study comparing 227 patients with type II diabetes mellitus (119 with versus 108 without diabetic retinopathy) as well as 169 nondiabetic subjects demonstrated that genotypes with Bgl II (+) allele had a significant increase in the risk for retinopathy. The odds ratio for Bgl II (+/+) to Bgl II (-/-) was 3.41 (95% CI, 1.49-7.78, P =.0036) when analysis was confined to those with a disease duration of diabetes of 10 years or more. The present study suggests that the presence of a Bg II (+) allele is a genetic risk factor for diabetic retinopathy. (Blood. 2000;95:1560-1564)

Alleles↗

Insertion/deletion and nucleotide polymorphism data reveal constraints in Drosophila melanogaster introns and intergenic regions.

Our study of nucleotide sequence and insertion/deletion polymorphism in Drosophila melanogaster noncoding DNA provides evidence for selective pressures in both intergenic regions and introns (of the large size class). Intronic and intergenic sequences show a similar polymorphic deletion bias. Insertions have smaller sizes and higher frequencies than deletions, supporting the hypothesis that insertions are selected to compensate for the loss of DNA caused by deletion bias. Analysis of a simple model of selective constraints suggests that the blocks of functional elements located in intergenic sequences are on average larger than those in introns, while the length distribution of relatively unconstrained sequences interspaced between these blocks is similar in intronic and intergenic regions.

Animals↗

Angiotensin-converting enzyme I/D polymorphism in Behçet's disease.

OBJECTIVE: To investigate a potential relationship between I/D polymorphism within intron 16 of the angiotensin-converting enzyme (ACE) gene located on human chromosome 17 and Behçet's disease. MATERIALS AND METHODS: Genomic DNA was obtained from 35 Turkish patients diagnosed with Behçet's disease according to the International Study Group criteria and 150 healthy individuals. Polymerase chain reaction was used to detect the presence of I and D (insertion and deletion) alleles in intron 16 of the ACE gene in these DNA samples. RESULTS: We found differences in ACE I/D polymorphism between Behçet's disease and healthy controls (chi2=4.61, d.f.=1, p=0.044). In Behçet's disease patients, the D allele frequency was 84.3% and I allele frequency 15.7%. CONCLUSION: An association between Behçet's disease and ACE polymorphism may provide a useful basis for future molecular studies and therapeutic approaches in this complex disease.

Behcet Syndrome↗

Evidence of genetic heterogeneity in IBD: 1. The interleukin-1 receptor antagonist in the predisposition to suffer from ulcerative colitis.

OBJECTIVE: To investigate a polymorphism within intron 2 of the interleukin-1 receptor antagonist (IL-1ra) gene in a Dutch white population of patients with ulcerative colitis and Crohn's disease. DESIGN: Genotype and allele frequencies of the polymorphic region in the IL-1ra gene were determined in 111 unrelated patients with ulcerative colitis, 92 patients with Crohn's disease, and 86 healthy controls. METHODS: The polymorphic region on the IL-1ra gene was amplified by the polymerase chain reaction (PCR). The resultant products were analyzed by electrophoresis on 2% agarose gels and stained with ethidium bromide. Amplification of the second exon of HLA-DRB1, HLA-DQA1, and HLA-DQB1 genes was performed by PCR, and Dot-blot analysis with biotin-labelled sequence-specific oligonucleotide probes was used for HLA typing. The standard perinuclear antineutrophil cytoplasmic antibodies (pANCA) indirect immunofluorescence assay was performed according to the protocol described by the First International Workshop on ANCA. RESULTS: The frequency of allele 2 of the IL-1ra gene in ulcerative colitis (27.0%) and Crohn's disease patients (25.5%) did not differ significantly from healthy controls (23.8%). However, the estimate of the relative risk for carriers of allele 2 for ulcerative colitis [odds ratio (OR): 1.35, 95%-confidence interval (CI) from 0.73 to 2.49] was in agreement with a previous British study. The exact test for homogeneity of odds ratios provided no evidence for heterogeneity between both populations (P = 0.35) and therefore confirmed the genetic associated between ulcerative colitis and the IL-1ra allele 2 in a different population. Our data confirm that, in ulcerative colitis, the presence of this allele is a genetic marker for severity of the disease. A significant association was demonstrated between the carriership of allele 2 of the IL-1ra gene and the trend over the three localizations in ulcerative colitis (P = 0.023). The same approach for Crohn's disease when compared with healthy controls did not provide evidence for a similar association. The meta-analysis, based on the British data and our data, yielded: OR = 1.06, 95%-CI from 0.71 to 1.59, and P = 0.767. No association between IL-1ra gene polymorphism, and pANCA and the HLA-DR2 allele was found in ulcerative colitis.

Alleles↗

High CA repeat numbers in intron 13 of the endothelial nitric oxide synthase gene and increased risk of coronary artery disease.

Endothelial nitric oxide synthase (eNOS) plays a key role in vascular homeostasis. Because its product, nitric oxide, possesses vasodilatory and antiatherogenic properties, an altered eNOS function might promote atherosclerosis. We investigated the association between variations in CA repeat copy number [(CA), polymorphism] in intron 13 of the eNOS gene and the risk of coronary artery disease. (CA), polymorphism was investigated in 1000 consecutive patients with angiographically confirmed coronary artery disease and 1000 age- and gender-matched control subjects by a PCR-based fragment length calculation. Twenty-eight different alleles were identified containing 17-44 CA repeats. The presence of one allele containing > or = 38 repeats was associated with an excess risk of coronary artery disease (odds ratio 1.94, 95% confidence interval 1.31-2.86, P = 0.001). Carriers of alleles containing > or = 38 CA repeats were, in particular, overrepresented in the subgroup without common cardiovascular risk factors (odds ratio 3.39, 95% confidence interval 1.30-8.86, P = 0.009). Logistic regression analysis revealed that the (CA), polymorphism proved to be an independent risk factor (relative risk 2.17, 95% confidence interval 1.44-3.27, P = 0.0002). Our findings indicate that high numbers of CA repeats in intron 13 of the eNOS gene are associated with an excess risk of coronary artery disease.

Adenine↗

Haplotype analysis of the human renin gene and essential hypertension.

The human renin gene is an attractive candidate for involvement in the underlying cause of essential hypertension (EH). Despite extensive examination, the relation between the renin gene and hypertension remains unclear. The aims of the present study were to discover new genetic markers of EH and to investigate the relations between polymorphisms of the renin gene and EH in the Japanese. Using the polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) method, we isolated 3 novel variants of the renin gene; a single nucleotide polymorphism (SNP) in intron 4 (T+17int4G), a variable number of tandem repeats (VNTR) polymorphism in intron 7, and a missense mutation in exon 9 (G1051A). We performed an association study with these polymorphisms in 212 patients with EH and 209 age-matched normotensive (NT) subjects. The frequency of genotypes VNTR and T+17int4G did not differ significantly between the 2 groups, whereas the overall distribution of G1051A was significantly different between EH and NT. Haplotype analysis revealed that the overall distribution of haplotypes differed significantly between the EH and NT groups. PRA levels in patients with EH with the G/G genotype were significantly higher than in subjects with EH with G/A and A/A genotypes. These data suggest that the missense mutation in exon 9 may affect the enzymatic function of renin and consequently may be involved in the etiology of hypertension.

Adult↗

Allelic loss at 10q26 in osteosarcoma in the region of the BUB3 and FGFR2 genes.

Loss of heterozygosity at 10q26 was mapped using microsatellite markers in 20 osteosarcomas. A four-megabase region centered on marker D10S587 was affected by allelic loss in 60 percent of osteosarcomas. The most frequently lost marker was D10S1723. Around 15 known genes are found in this region. The gene immediately adjacent to D10S1723 encodes BUB3, an element of the spindle assembly mitotic checkpoint. Loss of BUB3 function could contribute to chromosomal instability. The fibroblast growth factor receptor 2 (FGFR2) gene is located 2 Mb from the BUB3 gene and has the potential for a role in cancer. Inherited mutations of the FGFR2 gene result in skeletal dysplasias. FGFR2 alterations have also been implicated in gastric cancer. Human genome project data were used to design primers for amplifying FGFR2 in 18 genomic segments and BUB3 in 7 genomic segments. In each case, the segments encompassed coding exons and flanking intron sequences. The primers were used to search for mutations by polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP). Several shifted bands were detected in the BUB3 exon 3 fragment. Sequencing resolved the BUB3 exon 3 fragment shifts into polymorphisms in intron 2. No mutations of BUB3 or FGFR2 were detected. It remains possible that BUB3 or FGFR2 hemizygosity alone contributes to osteosarcoma, or that one of the genes is cryptically inactivated by a higher-order modification or mutation outside the coding region. There may also be a yet undiscovered tumor suppressor gene in this region.

Alleles↗

Haplotype study of three polymorphisms at the dopamine transporter locus confirm linkage to attention-deficit/hyperactivity disorder.

BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) is often treated using methylphenidate, a psychostimulant that inhibits the dopamine transporter. This led E.H. Cook and colleagues to consider the dopamine transporter locus (DAT1) as a primary candidate gene for ADHD. That group reported a significant association between ADHD and the 480-base pair (bp) allele of the variable number of tandem repeats (VNTR) polymorphism located in the 3' untranslated region of the DAT1 gene. This association was later replicated in additional studies. METHODS: The DAT1 gene has additional common polymorphisms in intron 9 and exon 9. We investigated the possibility of linkage of DAT1 and ADHD using the VNTR polymorphism and two additional common polymorphisms in 102 nuclear families with an ADHD proband. Using the transmission disequilibrium test, we examined the transmission of the alleles of each of these polymorphisms, as well as the haplotypes of the polymorphisms. RESULTS: We did not observe significant evidence for the biased transmission of the alleles of either the VNTR or the additional two polymorphisms when examined individually, although there was a trend for the biased transmission of the 480-bp allele of the VNTR. When we examined the haplotypes of the three polymorphisms we found significant evidence for biased transmission of one of the haplotypes containing the 480-bp VNTR allele. We also genotyped six additional DNA sequence variants of the DAT1 gene. However, these variants were not sufficiently polymorphic in our sample to be informative. Two of the DNA variants that result in an amino acid change, Ala559Val and Glu602Gly, were not observed in our sample. CONCLUSIONS: Our results support previous findings of an association between the DAT1 gene and ADHD.

Alleles↗

Comparative sequencing and association studies of aromatic L-amino acid decarboxylase in schizophrenia and bipolar disorder.

Aromatic L-amino acid decarboxylase (AADC) is a relatively non specific enzyme involved in the biosynthesis of several classical neurotransmitters including dopamine and 5-hydroxytryptamine (5HT; serotonin). AADC does not catalyse the rate limiting step in either pathway, but is rate limiting in the synthesis of 2-phenylethylamine (2PE) which is a positive modulator of dopaminergic transmission and a candidate natural psychotogenic compound.1 We and others have proposed that polymorphism in AADC resulting in altered 2PE activity might contribute to the pathogenesis of psychosis. In order to test this hypothesis, we have used denaturing high performance liquid chromatography (DHPLC)3 to screen 3943 bases of the AADC gene and its promoter regions for variants that might affect protein structure or expression in 15 unrelated people with schizophrenia, and 15 unrelated people with bipolar disorder. Three polymorphisms were identified by DHPLC: a insertion/deletion polymorphism in the 5' UTR of the neuronal specific mRNA (g.-33-30delAGAG, bases 586-589 of GenBank M77828), a T>A variant in the non-neuronal exon 1 (g. -67T>A, GenBank M88070), and a G>A polymorphism within intron 8 (g. IVS8 +75G>A, GenBank M84598). Case-control analysis did not suggest that genetic polymorphism in the AADC gene is associated with liability for developing schizophrenia or bipolar disorder.

Aromatic-L-Amino-Acid Decarboxylases↗

Endothelial nitric oxide synthase gene polymorphism and acute myocardial infarction.

Recently a point mutation of guanine to thymine at nucleotide position 1917 in the endothelial nitric oxide synthase (eNOS) gene has been reported to be associated with coronary artery spasm. In addition, a significant association of the 4a/b polymorphism in intron 4 of the eNOS gene with coronary artery disease has been reported. However, the implications of these polymorphisms with respect to acute myocardial infarction (AMI) remain to be established. We conducted a case-control study of 226 patients with AMI and 357 healthy gender- and age-matched control subjects. In the former group, coronary angiograms were evaluated according to angiographic criteria based on the number of diseased vessels (>/=75%) and the number of stenotic lesions (>/=50%). Homozygosity for the Glu-Asp298 polymorphism existed in 5 of 226 patients with AMI (2.2%) but not in any of the 357 control subjects (P=.0085). However, when we evaluated the coronary angiograms of 226 case patients, there was no difference in the number of diseased vessels or the number of stenotic lesions between the patients with this homozygote and those without it. By contrast, there was no evidence of a significant increase in the risk of AMI or the severity of coronary atherosclerosis among individuals with the a/a genotype of the eNOS4a/b polymorphism. Our results imply that patients who are homozygous for the Glu-Asp298 polymorphism may be genetically predisposed to AMI; however, this mutation apparently is not related to the severity of coronary atherosclerosis. Further studies are needed to confirm our results and characterize the molecular mechanisms by which eNOS is involved in susceptibility to AMI.

Case-Control Studies↗

The 3' untranslated region of the lipoprotein lipase gene: haplotype structure and association with post-heparin plasma lipase activity.

CONTEXT: Haplotypes comprising six single nucleotide polymorphisms (SNPs) (intron 7 to intron 9) of the lipoprotein lipase (LPL) gene appear to influence risk for atherosclerosis and insulin resistance in Mexican-Americans. OBJECTIVE: Based on rodent studies, we hypothesized that these haplotypes are in linkage disequilibrium with functional variants in the 3' untranslated region of LPL, which is encoded by exon 10, and that these variants influence phenotype by altering LPL expression. DESIGN: We sequenced exon 10 in subjects with divergent insulin sensitivity and divergent haplotypes. We also sequenced the other common LPL haplotypes. Variants identified by sequencing were genotyped in a large, family-based population along with the six SNPs spanning intron 7 to intron 9. We tested the potential functional significance of variation in exon 10 by evaluating association of haplotypes with post-heparin plasma LPL activity. SETTING: The study took place within the general community, with the Mexican-American Coronary Artery Disease Project cohort. PARTICIPANTS: Participants included 847 subjects from 163 families. MAIN OUTCOME MEASURES: We determined LPL haplogenotype and post-heparin plasma LPL activity. RESULTS: Exon 10 sequencing identified 15 variants. Thirteen of these variants were genotyped in large-scale along with the six SNPs spanning intron 7 to intron 9. LPL haplotypes and their relative frequencies in Mexican-Americans were determined. The fourth most common haplotype based on 19 SNPs (haplotype 19-4) was associated with increased LPL activity as well as multiple phenotypes related to the metabolic syndrome. CONCLUSIONS: These results support the possibility that variation in the 3' untranslated region of LPL affects LPL expression and activity, consequently influencing risk of atherosclerosis and insulin resistance, and provides important tools for further dissection of LPL regulation.

3' Untranslated Regions↗