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  • Heterozygote  (3)
  • International Polar Year (2007-2008); IPY  (2)
  • 1
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    Fine-scale recombination rate differences between sexes, populations and individuals (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-10-29
    Description: Meiotic recombinations contribute to genetic diversity by yielding new combinations of alleles. Recently, high-resolution recombination maps were inferred from high-density single-nucleotide polymorphism (SNP) data using linkage disequilibrium (LD) patterns that capture historical recombination events. The use of these maps has been demonstrated by the identification of recombination hotspots and associated motifs, and the discovery that the PRDM9 gene affects the proportion of recombinations occurring at hotspots. However, these maps provide no information about individual or sex differences. Moreover, locus-specific demographic factors like natural selection can bias LD-based estimates of recombination rate. Existing genetic maps based on family data avoid these shortcomings, but their resolution is limited by relatively few meioses and a low density of markers. Here we used genome-wide SNP data from 15,257 parent-offspring pairs to construct the first recombination maps based on directly observed recombinations with a resolution that is effective down to 10 kilobases (kb). Comparing male and female maps reveals that about 15% of hotspots in one sex are specific to that sex. Although male recombinations result in more shuffling of exons within genes, female recombinations generate more new combinations of nearby genes. We discover novel associations between recombination characteristics of individuals and variants in the PRDM9 gene and we identify new recombination hotspots. Comparisons of our maps with two LD-based maps inferred from data of HapMap populations of Utah residents with ancestry from northern and western Europe (CEU) and Yoruba in Ibadan, Nigeria (YRI) reveal population differences previously masked by noise and map differences at regions previously described as targets of natural selection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kong, Augustine -- Thorleifsson, Gudmar -- Gudbjartsson, Daniel F -- Masson, Gisli -- Sigurdsson, Asgeir -- Jonasdottir, Aslaug -- Walters, G Bragi -- Jonasdottir, Adalbjorg -- Gylfason, Arnaldur -- Kristinsson, Kari Th -- Gudjonsson, Sigurjon A -- Frigge, Michael L -- Helgason, Agnar -- Thorsteinsdottir, Unnur -- Stefansson, Kari -- England -- Nature. 2010 Oct 28;467(7319):1099-103. doi: 10.1038/nature09525.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉deCODE genetics, Sturlugata 8, 101 Reykjavik, Iceland. kong@decode.is〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20981099" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Chromosomes, Human/*genetics ; DNA-Binding Proteins/genetics ; Europe/ethnology ; Exons/genetics ; Female ; Genetics, Population ; Haplotypes/genetics ; Heterozygote ; Histone-Lysine N-Methyltransferase/genetics ; Humans ; Linkage Disequilibrium/genetics ; Male ; Meiosis/genetics ; Nigeria/ethnology ; Pedigree ; Polymorphism, Single Nucleotide/genetics ; Recombination, Genetic/*genetics ; Sample Size ; Selection, Genetic/genetics ; *Sex Characteristics ; Utah
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    A common variant on chromosome 9p21 affects the risk of myocardial infarction (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-05-05
    Description: The global endemic of cardiovascular diseases calls for improved risk assessment and treatment. Here, we describe an association between myocardial infarction (MI) and a common sequence variant on chromosome 9p21. This study included a total of 4587 cases and 12,767 controls. The identified variant, adjacent to the tumor suppressor genes CDKN2A and CDKN2B, was associated with the disease with high significance. Approximately 21% of individuals in the population are homozygous for this variant, and their estimated risk of suffering myocardial infarction is 1.64 times as great as that of noncarriers. The corresponding risk is 2.02 times as great for early-onset cases. The population attributable risk is 21% for MI in general and 31% for early-onset cases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helgadottir, Anna -- Thorleifsson, Gudmar -- Manolescu, Andrei -- Gretarsdottir, Solveig -- Blondal, Thorarinn -- Jonasdottir, Aslaug -- Jonasdottir, Adalbjorg -- Sigurdsson, Asgeir -- Baker, Adam -- Palsson, Arnar -- Masson, Gisli -- Gudbjartsson, Daniel F -- Magnusson, Kristinn P -- Andersen, Karl -- Levey, Allan I -- Backman, Valgerdur M -- Matthiasdottir, Sigurborg -- Jonsdottir, Thorbjorg -- Palsson, Stefan -- Einarsdottir, Helga -- Gunnarsdottir, Steinunn -- Gylfason, Arnaldur -- Vaccarino, Viola -- Hooper, W Craig -- Reilly, Muredach P -- Granger, Christopher B -- Austin, Harland -- Rader, Daniel J -- Shah, Svati H -- Quyyumi, Arshed A -- Gulcher, Jeffrey R -- Thorgeirsson, Gudmundur -- Thorsteinsdottir, Unnur -- Kong, Augustine -- Stefansson, Kari -- New York, N.Y. -- Science. 2007 Jun 8;316(5830):1491-3. Epub 2007 May 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉deCODE genetics, Sturlugata 8, IS-101 Reykjavik, Iceland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17478679" target="_blank"〉PubMed〈/a〉
    Keywords: Age of Onset ; Aged ; Case-Control Studies ; Chromosome Mapping ; Chromosomes, Human, Pair 9/*genetics ; Coronary Artery Disease/genetics ; Female ; Genes, p16 ; *Genetic Predisposition to Disease ; *Genetic Variation ; Genotype ; Haplotypes ; Heterozygote ; Homozygote ; Humans ; Linkage Disequilibrium ; Male ; Middle Aged ; Myocardial Infarction/*genetics ; *Polymorphism, Single Nucleotide ; Risk Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Nonsense mutation in the LGR4 gene is associated with several human diseases and other traits (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-05-07
    Description: Low bone mineral density (BMD) is used as a parameter of osteoporosis. Genome-wide association studies of BMD have hitherto focused on BMD as a quantitative trait, yielding common variants of small effects that contribute to the population diversity in BMD. Here we use BMD as a dichotomous trait, searching for variants that may have a direct effect on the risk of pathologically low BMD rather than on the regulation of BMD in the healthy population. Through whole-genome sequencing of Icelandic individuals, we found a rare nonsense mutation within the leucine-rich-repeat-containing G-protein-coupled receptor 4 (LGR4) gene (c.376C〉T) that is strongly associated with low BMD, and with osteoporotic fractures. This mutation leads to termination of LGR4 at position 126 and fully disrupts its function. The c.376C〉T mutation is also associated with electrolyte imbalance, late onset of menarche and reduced testosterone levels, as well as an increased risk of squamous cell carcinoma of the skin and biliary tract cancer. Interestingly, the phenotype of carriers of the c.376C〉T mutation overlaps that of Lgr4 mutant mice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Styrkarsdottir, Unnur -- Thorleifsson, Gudmar -- Sulem, Patrick -- Gudbjartsson, Daniel F -- Sigurdsson, Asgeir -- Jonasdottir, Aslaug -- Jonasdottir, Adalbjorg -- Oddsson, Asmundur -- Helgason, Agnar -- Magnusson, Olafur T -- Walters, G Bragi -- Frigge, Michael L -- Helgadottir, Hafdis T -- Johannsdottir, Hrefna -- Bergsteinsdottir, Kristin -- Ogmundsdottir, Margret H -- Center, Jacqueline R -- Nguyen, Tuan V -- Eisman, John A -- Christiansen, Claus -- Steingrimsson, Erikur -- Jonasson, Jon G -- Tryggvadottir, Laufey -- Eyjolfsson, Gudmundur I -- Theodors, Asgeir -- Jonsson, Thorvaldur -- Ingvarsson, Thorvaldur -- Olafsson, Isleifur -- Rafnar, Thorunn -- Kong, Augustine -- Sigurdsson, Gunnar -- Masson, Gisli -- Thorsteinsdottir, Unnur -- Stefansson, Kari -- HL-102923/HL/NHLBI NIH HHS/ -- HL-102924/HL/NHLBI NIH HHS/ -- HL-102925/HL/NHLBI NIH HHS/ -- HL-102926/HL/NHLBI NIH HHS/ -- HL-103010/HL/NHLBI NIH HHS/ -- England -- Nature. 2013 May 23;497(7450):517-20. doi: 10.1038/nature12124. Epub 2013 May 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉deCODE Genetics/Amgen, 101 Reykjavik, Iceland. unnurth@decode.is〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23644456" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Australia ; Biliary Tract Neoplasms/*genetics ; Bone Density/*genetics ; Carcinoma, Squamous Cell/*genetics ; Codon, Nonsense/*genetics ; Denmark ; Down-Regulation/genetics ; Female ; Heterozygote ; Humans ; Iceland ; Male ; Menarche/genetics ; Mice ; Mice, Knockout ; Osteoporotic Fractures/*genetics ; Phenotype ; Receptors, G-Protein-Coupled/chemistry/deficiency/*genetics/metabolism ; Skin Neoplasms/*genetics ; Testosterone/analysis ; Water-Electrolyte Imbalance/*genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Fecal pellet and egg production rates of copepod species at varying suspended sediment concentrations (2011)
    PANGAEA
    In:  Supplement to: Arendt, Kristine Engel; Dutz, Jörg; Jónasdóttir, Sigrún Huld; Jung-Madsen, Signe; Mortensen, John; Møller, Eva Friis; Nielsen, Torkel Gissel (2011): Effects of suspended sediments on copepods feeding in a glacial influenced sub-Arctic fjord. Journal of Plankton Research, 33(10), 1526-1537, https://doi.org/10.1093/plankt/fbr054
    Details
    Publication Date: 2024-01-17
    Description: We investigated the effect of suspended sediments on the vital rates of the copepods Calanus finmarchicus, Pseudocalanus sp. and Metridia longa in a Greenland sub-Arctic fjord. The fjord had a gradient of suspended particulate matter (SPM) with high concentrations (〉50 mg/L) in the inner fjord due to glacial melt water runoff. Laboratory experiments showed that when feeding on the diatom Thalassiosira weissflogii specific ingestion rates were low at high concentrations of suspended sediment for C. finmarchicus (〉20 mg/L) and Pseudocalanus sp. (〉50 mg/L), while no effect was found for M. longa. For C. finmarchicus, a relatively constant fecal pellet production (FPP) and fecal pellet volume suggested ingestion of sediment, which probably led to reduction in egg production rates (EPRs) at high sediment concentrations. For Pseudocalanus sp., FPP decreased with increasing sediment concentrations, while no effect was observed on EPR. No significant difference was observed in FPP for M. longa feeding on the diatom T. weissflogii compared to the ciliate Strombidium sulcatum. The study shows that high sediment concentrations influence the capability of carbon turnover in C. finmarchicus and Pseudocalanus sp., while M. longa appears to be more tolerant to high sediment loads. Therefore, high concentrations of SPM could potentially influence the species composition of glacially influenced fjords.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    Copepod abundance and fecal pellet production, sinking rate, and degradation in samples obtained during Leg 7 of Galathea 3 cruise 2006 (2011)
    PANGAEA
    In:  Supplement to: Møller, Eva Friis; Borg, Christian Marc A; Jónasdóttir, Sigrún Huld; Satapoomin, Suree; Jaspers, Cornelia; Nielsen, Torkel Gissel (2011): Production and fate of copepod fecal pellets across the Southern Indian Ocean. Marine Biology, 158(3), 677-688, https://doi.org/10.1007/s00227-010-1591-5
    Details
    Publication Date: 2023-12-13
    Description: The vertical distribution of copepods, fecal pellets and the fecal pellet production of copepods were measured at seven stations across the Southern Indian Ocean from productive areas off South Africa to oligotrophic waters off Northern Australia during October/November 2006. We quantified export of copepod fecal pellet from surface waters and how much was retained. Furthermore, the potential impact of Oncaea spp. and harpacticoid copepods on fecal pellets degradation was evaluated and found to be regional substantial. The highest copepod abundance and fecal pellet production was found in the western nutrient-rich stations close to South Africa and the lowest at the central oligotrophic stations. The in situ copepod fecal pellet production varied between 1 and 1,000 µg C/m**3/day. At all stations, the retention of fecal pellets in the upper 400 m of the water column was more than 99% and the vertical export of fecal pellets was low (〈0.02 mg/m**2/day).
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 2 datasets
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