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PubMed2004

Association study of dopamine transporter gene and schizophrenia in Korean population using multiple single nucleotide polymorphism markers.

Inherited or acquired dysfunction of the dopamine system is believed to underlie the core symptoms of schizophrenia, and there are some evidences that dopamine transporter activity may be altered in schizophrenic patients. Therefore, dopamine transporter gene (DAT1) has been traditionally considered a probable candidate gene for the association study of schizophrenia. Until now, association studies of the dopamine transporter gene (DAT1) with schizophrenia have yielded largely negative results. However, these results cannot be regarded as conclusive in that they were all obtained from just a single marker, that is, 3' untranslated region variable number of tandem repeat (VNTR). We have therefore tried to find other single nucleotide polymorphisms (SNPs) in DAT1 gene and to use them as additional markers for the association study of schizophrenia. Searching for the SNPs had been done with 50 Korean schizophrenic patients. DNA sequences encompassing the whole exon and flanking exon-intron junctions were amplified and searched for the presence of SNPs. Total of five SNPs were found. Among these, three SNPs (1215A>G, 1398C>T, IVS11+14G>A) as well as the 3' untranslated region VNTR were selected as the markers to be genotyped. The allelic and genotypic frequencies of these markers were determined in 252 schizophrenic patients and 271 controls and compared between them. The frequencies of algorithmically derived haplotypes were also compared. No evidence of association was found between any of these markers and schizophrenia. The result using haplotypes was also negative. However, when the patient subgroup with verified familial history and the subgroup with early age of onset were re-analyzed, weak trend of association between 1398C>T SNP marker with schizophrenia was found in both cases. In accordance with the previous literature, we could not find any evidence of association between DAT1 gene and schizophrenia. This result acquired more certainty because not only the VNTR but several SNPs present in DAT1 gene and newly constructed haplotypes were also used as additional markers. However, the finding of weak association between one of the SNP markers (1398C>T) and the specific subgroups of schizophrenia patients added further support to the importance of defining more homogenous subgroups in association studies.

3' Untranslated Regions↗
PubMed2005

Sequence context analysis in the mouse genome: single nucleotide polymorphisms and CpG island sequences.

A genome-wide view of sequence mutability in mice is still limited, although biologists usually assume the same scenario for mice as for humans. In this study, we examined the sequence context in the local environment of 482,528 mouse single nucleotide polymorphisms (SNPs). We found that CpG-containing short sequences, in general, had more representation in the local sequences of SNPs compared to the genome sequences. The extent of this overrepresentation was stronger in mice than in humans, which is inconsistent with previous observations of the weaker neighboring-nucleotide biases on mouse SNPs. To exclude the CpG effect, we compared the distribution patterns of short sequences among the six categories of SNPs. The results revealed an even stronger pattern in the CpG-containing group for C/G substitution compared to for A/G or C/T substitutions. We next performed the first genome-wide sequence context analysis of SNPs in the mouse CpG islands. SNPs occurring at CpG sites were 3.14-fold less prevalent than expected, suggesting the suppression of methylation-dependent deamination in the CpG islands. The extent of this suppression was less in mice than in humans. Finally, compared with humans, the observations of a greater deficit of CpG dinucleotides, a stronger overrepresentation of CpG-containing n-mers surrounding the polymorphic sites, and a higher SNP/genome ratio of CpG dinucleotides in the mouse genome support the "loss of CpG islands" model in the mouse lineage.

Animals↗
PubMed2000

Identification and characterization of coding single-nucleotide polymorphisms within a human olfactory receptor gene cluster.

Single-nucleotide polymorphisms (SNPs) were studied in 15 olfactory receptor (OR) coding regions, one control region and two noncoding sequences all residing within a 412 kb OR gene cluster on human chromosome 17p13.3, as well as in other G-protein coupled receptors (GPCRs). A total of 26 SNPs were identified in ORs, 21 of which are coding SNPs (cSNPs). The mean nucleotide diversity of OR coding regions was 0.078% (ranging from 0 to 0.16%), which is about twice higher than that of other GPCRs, and similar to the nucleotide diversity levels of noncoding regions along the human genome. The high polymorphism level in the OR coding regions might be due to a weak positive selection pressure acting on the OR genes. In two cases, OR genes have been found to share the same cSNP. This could be explained by recent gene conversion events, which might be a part of a concerted evolution mechanism acting on the OR superfamily. Using the genotype data of 85 unrelated individuals in 15 SNPs, we found linkage disequilibrium (LD) between pairs of SNPs located on the centromeric part of the cluster. On the other hand, no LD was found between SNPs located on the telomeric part of the cluster, suggesting the presence of several hot-spots for recombination within this cluster. Thus, different regions of this gene cluster may have been subject to different recombination rates.

Alleles↗
PubMed2003

Investigating single nucleotide polymorphism (SNP) density in the human genome and its implications for molecular evolution.

We investigated the single nucleotide polymorphism (SNP) density across the human genome and in different genic categories using two SNP databases: Celera's CgsSNP, which includes SNPs identified by comparing genomic sequences, and Celera's RefSNP, which includes SNPs from a variety of sources and is biased toward disease-associated genes. Based on CgsSNP, the average numbers of SNPs per 10 kb was 8.33, 8.44, and 8.09 in the human genome, in intergenic regions, and in genic regions, respectively. In genic regions, the SNP density in intronic, exonic and adjoining untranslated regions was 8.21, 5.28, and 7.51 SNPs per 10 kb, respectively. The pattern of SNP density based on RefSNP was different from that based on CgsSNP, emphasizing its utility for genotype-phenotype association studies but not for most population genetic studies. The number of SNPs per chromosome was correlated with chromosome length, but the density of SNPs estimated by CgsSNP was not significantly correlated with the GC content of the chromosome. Based on CgsSNP, the ratio of nonsense to missense mutations (0.027), the ratio of missense to silent mutations (1.15), and the ratio of non-synonymous to synonymous mutations (1.18) was less than half of that expected in a human protein coding sequence under the neutral mutation theory, reflecting a role for natural selection, especially purifying selection.

DNA, Intergenic↗
PubMed2003

High-resolution SNP scan of chromosome 6p21 in pooled samples from patients with complex diseases.

We apply a high-throughput protocol of chip-based mass spectrometry (matrix-assisted laser desorption/ionization time-of-flight; MALDI-TOF) as a method of screening for differences in single-nucleotide polymorphism (SNP) allele frequencies. Using pooled DNA from individuals with asthma, Crohn's disease (CD), schizophrenia, type 1 diabetes (T1D), and controls, we selected 534 SNPs from an initial set of 1435 SNPs spanning a 25-Mb region on chromosome 6p21. The standard deviations of measurements of time of flight at different dots, from different PCRs, and from different pools indicate reliable results on each analysis step. In 90% of the disease-control comparisons we found allelic differences of <10%. Of the T1D samples, which served as a positive control, 10 SNPs with significant differences were observed after taking into account multiple testing. Of these 10 SNPs, 5 are located between DQB1 and DRB1, confirming the known association with the DR3 and DR4 haplotypes whereas two additional SNPs also reproduced known associations of T1D with DOB and LTA. In the CD pool also, two earlier described associations were found with SNPs close to DRB1 and MICA. Additional associations were found in the schizophrenia and asthma pools. They should be confirmed in individual samples or can be used to develop further quality criteria for accepting true differences between pools. The determination of SNP allele frequencies in pooled DNA appears to be of value in assigning further genotyping priorities also in large linkage regions.

Asthma↗
PubMed2003

Molecular screening and association studies of retinoid-related orphan receptor gamma (RORC): a positional and functional candidate for type 2 diabetes.

The retinoid-related orphan receptor gamma (RORC) is a member of the nuclear hormone superfamily which maps to the 1q21-q23 region. Linkage of type 2 diabetes (T2DM) to this region is well replicated. Several factors argue that RORC is a strong candidate for T2DM susceptibility within this region. RORC may form heterodimers with peroxisome-proliferator activated receptor gamma, it is expressed at high levels in skeletal muscle, and expression is induced in adipocytes during differentiation. To test the hypothesis that sequence variation in RORC is a risk factor for T2DM, we screened approximately 21kb of DNA for sequence variation, including 11 exons of the RORC gene, a region 1-kb upstream (5' flanking region), intronic regions flanking the exons, and the entire 3' untranslated region (UTR). Screening was performed using single strand conformation polymorphism (SSCP) analysis in Caucasian individuals of northern European ancestry and in African American individuals. We detected 11 single nucleotide polymorphisms (SNPs), ranging from the promoter region to intron 10. We also confirmed 2 SNPs from public databases that were in regions not included in our screening. Only 1 SNP was nonsynonymous, resulting in Ala to Gly at residue 464 (exon 10). All other SNPs were noncoding. One SNP (intron 3) was unique to Caucasians, and three SNPs (Ala464Gly, intron 2, intron 6) were specific to African American subjects. We typed 7 SNPs spanning the gene from the promoter to 3' UTR in unrelated cases with T2DM and controls of Northern European ancestry. We also tested linkage of a microsatellite within the RORC gene. Modest evidence for linkage (LOD=1.47) was seen on two-point analysis, but no linkage to the RORC region was found on multipoint analysis. However, transmission of the microsatellite alleles from parents to affected offspring showed a trend to deviate from the expected 50% (p=0.078). No association of any other SNP with T2DM was found, but the Ala454Gly variant was 3-fold more common among African American patients with diabetes than in controls. SNPs 1, 2 and 4 were in strong linkage disequilibrium (D>0.85) and may constitute a haplotype block. Our data suggest that RORC cannot explain the linkage of T2DM in this region. The role of the unusual Ala454Gly variant will require a much larger study size to evaluate.

Black or African American↗
PubMed2004

Genotyping possible polymorphic variants of human mismatch repair genes in healthy Korean individuals and sporadic colorectal cancer patients.

The genotypic consequences of numerous single-nucleotide variants in human mismatch repair genes are mostly undetermined. We examined 27 reported single-nucleotide variants, rarely or ambiguously verified in a population-based study, to identify single-nucleotide polymorphisms (SNPs), haplotypes, and the genotype-phenotype association in Korean populations of 330 healthy individuals, 107 sporadic colorectal cancer patients, and 107 of their first-degree relatives. Real-time PCR 5'-nuclease assays (TaqMan) MGB assay) were used to determine 24 single-nucleotide variants, and restriction fragment length polymorphism (RFLP) assays were used to determine 3 variants. Of these 27 variants, 4 (hMSH2 gIVS12-6, hMLH1 655, hMLH1 1151, and hMSH2 1168, in descending order) were identified as SNPs occurring in 4.5 to 53.1% of healthy individuals, with polymorphism levels of 0.023-0.3 (mean, 0.092). East Asian populations had an ethnic predilection for the hMLH1 1151 SNP. The genotype distribution for all four SNPs showed no association with sporadic colorectal cancer. Twenty-three variants were not identified in the Korean population, suggesting that fifteen of these variants are colorectal cancer-related mutations and eight are SNPs. Two haplotype patterns existed exclusively, but with rare frequency, in sporadic colorectal cancer patients. The hMLH1 655 allele was closely correlated with hMLH1 protein expression (P = 0.02), but none of the four SNPs was associated with clinicopathologic variables. Among the 27 single nucleotide variants of mismatch repair genes, 12 were suggestive of nonfunctional SNPs and 15 may be colorectal cancer-related mutations. Further verification in other ethnic groups may provide the genotypic and phenotypic significance of single nucleotide variants found in mismatch repair genes.

Adaptor Proteins, Signal Transducing↗
PubMed1999

Characterization of single-nucleotide polymorphisms in coding regions of human genes.

A major goal in human genetics is to understand the role of common genetic variants in susceptibility to common diseases. This will require characterizing the nature of gene variation in human populations, assembling an extensive catalogue of single-nucleotide polymorphisms (SNPs) in candidate genes and performing association studies for particular diseases. At present, our knowledge of human gene variation remains rudimentary. Here we describe a systematic survey of SNPs in the coding regions of human genes. We identified SNPs in 106 genes relevant to cardiovascular disease, endocrinology and neuropsychiatry by screening an average of 114 independent alleles using 2 independent screening methods. To ensure high accuracy, all reported SNPs were confirmed by DNA sequencing. We identified 560 SNPs, including 392 coding-region SNPs (cSNPs) divided roughly equally between those causing synonymous and non-synonymous changes. We observed different rates of polymorphism among classes of sites within genes (non-coding, degenerate and non-degenerate) as well as between genes. The cSNPs most likely to influence disease, those that alter the amino acid sequence of the encoded protein, are found at a lower rate and with lower allele frequencies than silent substitutions. This likely reflects selection acting against deleterious alleles during human evolution. The lower allele frequency of missense cSNPs has implications for the compilation of a comprehensive catalogue, as well as for the subsequent application to disease association.

Alleles↗
PubMed1999

Patterns of single-nucleotide polymorphisms in candidate genes for blood-pressure homeostasis.

Sequence variation in human genes is largely confined to single-nucleotide polymorphisms (SNPs) and is valuable in tests of association with common diseases and pharmacogenetic traits. We performed a systematic and comprehensive survey of molecular variation to assess the nature, pattern and frequency of SNPs in 75 candidate human genes for blood-pressure homeostasis and hypertension. We assayed 28 Mb (190 kb in 148 alleles) of genomic sequence, comprising the 5' and 3' untranslated regions (UTRs), introns and coding sequence of these genes, for sequence differences in individuals of African and Northern European descent using high-density variant detection arrays (VDAs). We identified 874 candidate human SNPs, of which 22% were confirmed by DNA sequencing to reveal a discordancy rate of 21% for VDA detection. The SNPs detected have an average minor allele frequency of 11%, and 387 are within the coding sequence (cSNPs). Of all cSNPs, 54% lead to a predicted change in the protein sequence, implying a high level of human protein diversity. These protein-altering SNPs are 38% of the total number of such SNPs expected, are more likely to be population-specific and are rarer in the human population, directly demonstrating the effects of natural selection on human genes. Overall, the degree of nucleotide polymorphism across these human genes, and orthologous great ape sequences, is highly variable and is correlated with the effects of functional conservation on gene sequences.

3' Untranslated Regions↗
PubMed2000

An SNP map of human chromosome 22.

The human genome sequence will provide a reference for measuring DNA sequence variation in human populations. Sequence variants are responsible for the genetic component of individuality, including complex characteristics such as disease susceptibility and drug response. Most sequence variants are single nucleotide polymorphisms (SNPs), where two alternate bases occur at one position. Comparison of any two genomes reveals around 1 SNP per kilobase. A sufficiently dense map of SNPs would allow the detection of sequence variants responsible for particular characteristics on the basis that they are associated with a specific SNP allele. Here we have evaluated large-scale sequencing approaches to obtaining SNPs, and have constructed a map of 2,730 SNPs on human chromosome 22. Most of the SNPs are within 25 kilobases of a transcribed exon, and are valuable for association studies. We have scaled up the process, detecting over 65,000 SNPs in the genome as part of The SNP Consortium programme, which is on target to build a map of 1 SNP every 5 kilobases that is integrated with the human genome sequence and that is freely available in the public domain.

Cell Line↗
PubMed2000

Large-scale discovery and genotyping of single-nucleotide polymorphisms in the mouse.

Single-nucleotide polymorphisms (SNPs) have been the focus of much attention in human genetics because they are extremely abundant and well-suited for automated large-scale genotyping. Human SNPs, however, are less informative than other types of genetic markers (such as simple-sequence length polymorphisms or microsatellites) and thus more loci are required for mapping traits. SNPs offer similar advantages for experimental genetic organisms such as the mouse, but they entail no loss of informativeness because bi-allelic markers are fully informative in analysing crosses between inbred strains. Here we report a large-scale analysis of SNPs in the mouse genome. We characterized the rate of nucleotide polymorphism in eight mouse strains and identified a collection of 2,848 SNPs located in 1,755 sequence-tagged sites (STSs) using high-density oligonucleotide arrays. Three-quarters of these SNPs have been mapped on the mouse genome, providing a first-generation SNP map of the mouse. We have also developed a multiplex genotyping procedure by which a genome scan can be performed with only six genotyping reactions per animal.

Animals↗
PubMed2000

Genome-wide analysis of single-nucleotide polymorphisms in human expressed sequences.

Single-nucleotide polymorphisms (SNPs) have been explored as a high-resolution marker set for accelerating the mapping of disease genes. Here we report 48,196 candidate SNPs detected by statistical analysis of human expressed sequence tags (ESTs), associated primarily with coding regions of genes. We used Bayesian inference to weigh evidence for true polymorphism versus sequencing error, misalignment or ambiguity, misclustering or chimaeric EST sequences, assessing data such as raw chromatogram height, sharpness, overlap and spacing, sequencing error rates, context-sensitivity and cDNA library origin. Three separate validations-comparison with 54 genes screened for SNPs independently, verification of HLA-A polymorphisms and restriction fragment length polymorphism (RFLP) testing-verified 70%, 89% and 71% of our predicted SNPs, respectively. Our method detects tenfold more true HLA-A SNPs than previous analyses of the EST data. We found SNPs in a large fraction of known disease genes, including some disease-causing mutations (for example, the HbS sickle-cell mutation). Our comprehensive analysis of human coding region polymorphism provides a public resource for mapping of disease genes (available at http://www.bioinformatics.ucla.edu/snp).

Base Sequence↗
PubMed2003

Large-scale genotyping of complex DNA.

Genetic studies aimed at understanding the molecular basis of complex human phenotypes require the genotyping of many thousands of single-nucleotide polymorphisms (SNPs) across large numbers of individuals. Public efforts have so far identified over two million common human SNPs; however, the scoring of these SNPs is labor-intensive and requires a substantial amount of automation. Here we describe a simple but effective approach, termed whole-genome sampling analysis (WGSA), for genotyping thousands of SNPs simultaneously in a complex DNA sample without locus-specific primers or automation. Our method amplifies highly reproducible fractions of the genome across multiple DNA samples and calls genotypes at >99% accuracy. We rapidly genotyped 14,548 SNPs in three different human populations and identified a subset of them with significant allele frequency differences between groups. We also determined the ancestral allele for 8,386 SNPs by genotyping chimpanzee and gorilla DNA. WGSA is highly scaleable and enables the creation of ultrahigh density SNP maps for use in genetic studies.

Algorithms↗
PubMed2002

Single nucleotide polymorphisms in the transcobalamin gene: relationship with transcobalamin concentrations and risk for neural tube defects.

Homocysteine levels are elevated in mothers of neural tube defect (NTD) children, which may be due to a disturbed folate or vitamin B12 metabolism. Vitamin B12 is transported to the tissues by transcobalamin (TC). We previously showed that a low holo-TC/total-TC ratio is a risk factor for NTD, possibly due to an impaired binding of vitamin B12 to TC. The coding region of the TC gene of 12 individuals was analysed for genetic variations responsible for a disturbed vitamin B12 binding. The influence of the genetic variations observed on total-TC, holo-TC, holo-TC/total-TC, erythrocyte vitamin B12, plasma homocysteine concentrations and risk for NTD was explored in 42 mothers of a child with NTD and in 73 female controls. Direct sequencing analyses revealed five single nucleotide polymorphisms (SNPs). Three SNPs affected total-TC concentrations, whereas two SNPs seem to affect the binding of vitamin B12. None of the genotypes defined by the SNPs had a significant effect on homocysteine levels, or was associated with an increased NTD risk. Among the five SNPs observed only P259R could partly explain the reduced proportion of vitamin B12 bound to TC, which has been associated with an increased risk for having a child with NTD. Some of the variants studied affected total-TC and holo-TC/total-TC ratio but a larger study population is required to elucidate whether these SNPs influence delivery of vitamin B12 to the tissue, influence homocysteine levels and whether they are associated with an increased NTD risk.

Adult↗
PubMed2005

Genetic stratification of pathogen-response-related and other variants within a homogeneous Caucasian Irish population.

Selection pressures from pathogens impact on the worldwide geographic distribution of polymorphisms in certain pathogen-response-associated genes. Such gene-specific effects could lead to confounding by geographic disease associations. We wished to determine if such constraints impinge on the genetic structure of a population of Irish patients and whether variants associated with responses to pathogens showed greater stratification. The counties of origin of each subject's grandparents were used as the geographic variable. F(st), proportional to the extent of population structure, was low (mean F(st)=0.004 across 25 SNPs, range 0.001-0.008) and it was not significantly higher for pathogen response SNPs (F(st)=0.004) than for other SNPs (F(st)=0.003, P=0.21). Correspondence analysis revealed weak trends primarily in approximately northeast to southwest and secondarily in northwest to southeast directions. One-dimensional spatial autocorrelation analysis revealed a weak (Moran's I autocorrelation of -0.10) tendency for SNP frequencies to diverge with greater distance. Two-dimensional autocorrelation indicated a northeast to southwest gradient that was similar for both the pathogen response and other SNPs. The southeastern county, Wexford, showed a distinctive pattern, perhaps consistent with Anglo-Norman settlements. In conclusion, these results indicate that pathogen response SNPs do not exhibit significantly more population structure than other SNPs within this Caucasian population. This suggests that the specific population structure of particular genes may not typically be a cause of strong confounding in genetic studies where population structure is controlled.

Arylsulfotransferase↗
PubMed2003

Candidate genes for anorexia nervosa in the 1p33-36 linkage region: serotonin 1D and delta opioid receptor loci exhibit significant association to anorexia nervosa.

Serotonergic and opioidergic neurotransmitter system alterations have been observed in people with eating disorders; the genes for the serotonin 1D receptor (HTR1D) and the opioid delta receptor (OPRD1) are found on chr1p36.3-34.3, a region identified by our group in a linkage analysis of anorexia nervosa (AN). These candidate genes were evaluated for sequence variation and for linkage and association of this sequence variation to AN in family and case : control data sets. Resequencing of the HTR1D locus and a portion of the OPRD1 locus identified novel SNPs and confirmed existing SNPs. Genotype assay development and genotyping of nine SNPs (four at HTR1D and five at OPRD1) was performed on 191 unrelated individuals fulfilling DSM-IV criteria (w/o amenorrhea criterion) for AN, 442 relatives of AN probands and 98 psychiatrically screened controls. Linkage analysis of these candidate gene SNPs with 33 microsatellite markers in families including relative pairs concordantly affected with restricting AN (N=37) substantially increased the evidence for linkage of this region to restricting AN to an NPL score of 3.91. Statistically significant genotypic, allelic, and haplotypic association to AN in the case : control design was observed at HTR1D and OPRD1 with effect sizes for individual SNPs of 2.63 (95% CI=1.21-5.75) for HTR1D and 1.61 (95% CI=1.11-2.44) for OPRD1. Using genotype data on parents and AN probands, three SNPs at HTR1D were found to exhibit significant transmission disequilibrium (P&<0.05). The combined statistical genetic evidence suggests that HTR1D and OPRD1 or linked genes may be involved in the etiology of AN.

Anorexia Nervosa↗
PubMed2002

Within-breed heterozygosity of canine single nucleotide polymorphisms identified by across-breed comparison.

Identification of single nucleotide polymorphisms (SNPs) by DNA sequence comparison across breeds is a strategy for developing genetic markers that are useful for many breeds. However, the heterozygosity of SNPs identified in this way might be severely reduced within breeds by inbreeding or genetic drift in the small effective population size of a breed (population subdivision). The effect of inbreeding and population subdivision on heterozygosity of SNPs in dog breeds has never been investigated in a systematic way. We determined the genotypes of dogs from three divergent breeds for SNPs in four canine genes (ACTC, LMNA, SCGB, and TYMS) identified by across-breed DNA sequence comparison, and compared the genotype frequencies to those expected under Hardy-Weinberg equilibrium (HWE). Although population subdivision significantly skewed allele frequencies across breeds for two of the SNPs, the deviations of observed heterozygosities compared with those expected within breeds were minimal. These results indicate that across-breed DNA sequence comparison is a reasonable strategy for identifying SNPs that are useful within many canine breeds.

Animals↗
PubMed2003

Genetic variation in the IGSF6 gene and lack of association with inflammatory bowel disease.

The immunoglobulin superfamily 6 gene (IGSF6) on chromosome 16p11-p12 has been investigated as a positional and functional candidate for inflammatory bowel disease (IBD) susceptibility. Screening of the six exons of IGSF6 for single nucleotide polymorphisms (SNPs) detected four novel SNPs, and validated three of six SNPs listed in the international SNP database (dbSNP). The seven SNPs in IGSF6 formed five distinct linkage disequilibrium groups. There was no evidence for association of the common SNPs with disease in a large cohort of patients with IBD. The novel SNPs and the linkage disequilibrium map will be a useful resource for the analysis of IGSF6 in other immune disorders.

CD8 Antigens↗