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  • 1
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    Greenlandic Inuit show genetic signatures of diet and climate adaptation (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-09-19
    Description: The indigenous people of Greenland, the Inuit, have lived for a long time in the extreme conditions of the Arctic, including low annual temperatures, and with a specialized diet rich in protein and fatty acids, particularly omega-3 polyunsaturated fatty acids (PUFAs). A scan of Inuit genomes for signatures of adaptation revealed signals at several loci, with the strongest signal located in a cluster of fatty acid desaturases that determine PUFA levels. The selected alleles are associated with multiple metabolic and anthropometric phenotypes and have large effect sizes for weight and height, with the effect on height replicated in Europeans. By analyzing membrane lipids, we found that the selected alleles modulate fatty acid composition, which may affect the regulation of growth hormones. Thus, the Inuit have genetic and physiological adaptations to a diet rich in PUFAs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fumagalli, Matteo -- Moltke, Ida -- Grarup, Niels -- Racimo, Fernando -- Bjerregaard, Peter -- Jorgensen, Marit E -- Korneliussen, Thorfinn S -- Gerbault, Pascale -- Skotte, Line -- Linneberg, Allan -- Christensen, Cramer -- Brandslund, Ivan -- Jorgensen, Torben -- Huerta-Sanchez, Emilia -- Schmidt, Erik B -- Pedersen, Oluf -- Hansen, Torben -- Albrechtsen, Anders -- Nielsen, Rasmus -- R01-HG003229/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2015 Sep 18;349(6254):1343-7. doi: 10.1126/science.aab2319.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Evolution, and Environment, University College London, London WC1E 6BT, UK. Department of Integrative Biology, University of California-Berkeley, Berkeley, CA 94720, USA. ; The Bioinformatics Centre, Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark. ; The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark. ; Department of Integrative Biology, University of California-Berkeley, Berkeley, CA 94720, USA. ; National Institute of Public Health, University of Southern Denmark, 1353 Copenhagen, Denmark. Greenland Center for Health Research, University of Greenland, Nuuk, Greenland. ; National Institute of Public Health, University of Southern Denmark, 1353 Copenhagen, Denmark. Steno Diabetes Center, 2820 Gentofte, Denmark. ; Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, 1350 Copenhagen, Denmark. ; Department of Genetics, Evolution, and Environment, University College London, London WC1E 6BT, UK. Department of Anthropology, University College London, London WC1H 0BW, UK. ; Research Centre for Prevention and Health, Capital Region of Denmark, Copenhagen, Denmark. Department of Clinical Experimental Research, Rigshospitalet, Glostrup, Denmark. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. ; Department of Medicine, Lillebaelt Hospital, Vejle, Denmark. ; Department of Clinical Biochemistry, Lillebaelt Hospital, Vejle, Denmark. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark. ; Research Centre for Prevention and Health, Capital Region of Denmark, Copenhagen, Denmark. Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Faculty of Medicine, University of Aalborg, Aalborg, Denmark. ; School of Natural Sciences, University of California-Merced, Merced, CA 95343, USA. ; Faculty of Medicine, University of Aalborg, Aalborg, Denmark. Department of Cardiology, Aalborg University Hospital, 9100 Aalborg, Denmark. ; The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark. torben.hansen@sund.ku.dk albrecht@binf.ku.dk rasmus_nielsen@berkeley.edu. ; The Bioinformatics Centre, Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark. torben.hansen@sund.ku.dk albrecht@binf.ku.dk rasmus_nielsen@berkeley.edu. ; Department of Integrative Biology, University of California-Berkeley, Berkeley, CA 94720, USA. Department of Statistics, University of California-Berkeley, Berkeley, CA 94720, USA. torben.hansen@sund.ku.dk albrecht@binf.ku.dk rasmus_nielsen@berkeley.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26383953" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization/*genetics ; Alleles ; Arctic Regions ; Body Height/genetics ; Body Weight/genetics ; Chromosomes, Human, Pair 11/genetics ; Climate ; *Diet, High-Fat ; Fatty Acids, Omega-3/*administration & dosage/analysis ; Female ; Genetic Loci ; Genome, Human/genetics ; Genome-Wide Association Study ; Greenland ; Humans ; Inuits/*genetics ; Linkage Disequilibrium ; Male ; Membrane Lipids/analysis/genetics ; Polymorphism, Single Nucleotide ; Selection, Genetic
    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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  • 2
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    Deletions at short direct repeats and base substitutions are characteristic mutations for bleomycin-induced double- and single-strand breaks, respectively, in a human shuttle vector system (1995)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Using the radiomimetic drug, bleomycin, we have determined the mutagenic potential of DNA strand breaks in the shuttle vector pZ189 in human fibroblasts. The bleomycin treatment conditions used produce strand breaks with 3'-phosphoglycolate termini as 〉 95% of the detectable dose-dependent lesions. Breaks with this end group represent 50% of the strand break damage produced by ionizing radiation. We report that such strand breaks are mutagenic lesions. The type of mutation produced is largely determined by the type of strand break on the plasmid (i.e. single versus double). Mutagenesis studies with purified DNA forms showed that nicked plasmids (i.e. those containing single-strand breaks) predominantly produce base substitutions, the majority of which are multiples, which presumably originate from error-prone polymerase activity at strand break sites. In contrast, repair of linear plasmids (i.e. those containing double-strand breaks) mainly results in deletions at short direct repeat sequences, indicating the involvement of illegitimate recombination. The data characterize the nature of mutations produced by single- and double-strand breaks in human cells, and suggests that deletions at direct repeats may be a 'signature' mutation for the processing of DNA double-strand breaks.
    Keywords: Life Sciences (General)
    Type: Nucleic acids research (ISSN 0305-1048); Volume 23; 16; 3224-30
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  • 3
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    Determination of human DNA polymerase utilization for the repair of a model ionizing radiation-induced DNA strand break lesion in a defined vector substrate (1999)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Human DNA polymerase and DNA ligase utilization for the repair of a major class of ionizing radiation-induced DNA lesion [DNA single-strand breaks containing 3'-phosphoglycolate (3'-PG)] was examined using a novel, chemically defined vector substrate containing a single, site-specific 3'-PG single-strand break lesion. In addition, the major human AP endonuclease, HAP1 (also known as APE1, APEX, Ref-1), was tested to determine if it was involved in initiating repair of 3'-PG-containing single-strand break lesions. DNA polymerase beta was found to be the primary polymerase responsible for nucleotide incorporation at the lesion site following excision of the 3'-PG blocking group. However, DNA polymerase delta/straightepsilon was also capable of nucleotide incorporation at the lesion site following 3'-PG excision. In addition, repair reactions catalyzed by DNA polymerase beta were found to be most effective in the presence of DNA ligase III, while those catalyzed by DNA polymerase delta/straightepsilon appeared to be more effective in the presence of DNA ligase I. Also, it was demonstrated that the repair initiating 3'-PG excision reaction was not dependent upon HAP1 activity, as judged by inhibition of HAP1 with neutralizing HAP1-specific polyclonal antibody.
    Keywords: Life Sciences (General)
    Type: Nucleic acids research (ISSN 0305-1048); Volume 27; 11; 2423-33
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  • 4
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    Lack of dependence on p53 for DNA double strand break repair of episomal vectors in human lymphoblasts (1999)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The p53 tumor suppressor gene has been shown to be involved in a variety of repair processes, and recent findings have suggested that p53 may be involved in DNA double strand break repair in irradiated cells. The role of p53 in DNA double strand break repair, however, has not been fully investigated. In this study, we have constructed a novel Epstein-Barr virus (EBV)-based shuttle vector, designated as pZEBNA, to explore the influence of p53 on DNA strand break repair in human lymphoblasts, since EBV-based vectors do not inactivate the p53 pathway. We have compared plasmid survival of irradiated, restriction enzyme linearized, and calf intestinal alkaline phosphatase (CIP)-treated pZEBNA with a Simian virus 40 (SV40)-based shuttle vector, pZ189, in TK6 (wild-type p53) and WTK1 (mutant p53) lymphoblasts and determined that p53 does not modulate DNA double strand break repair in these cell lines. Copyright 1999 Academic Press.
    Keywords: Life Sciences (General)
    Type: Biochemical and biophysical research communications (ISSN 0006-291X); Volume 264; 3; 702-8
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  • 5
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    The influence of SV40 immortalization of human fibroblasts on p53-dependent radiation responses (1999)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The simian virus 40 large tumor antigen (SV40 Tag) has been ascribed many functions critical to viral propagation, including binding to the mammalian tumor suppressor p53. Recent studies have demonstrated that SV40-transformed murine cells have functional p53. The status of p53 in SV40-immortalized human cells, however, has not been characterized. We have found that in response to ionizing radiation, p53-dependent p21 transactivation activity is present, albeit reduced, in SV40-immortalized cells and that this activity can be further reduced with either dominant negative p53 expression or higher SV40 Tag expression. Furthermore, overexpression of p53 in SV40-immortalized ataxia-telangiectasia (A-T) cells restores p53-dependent p21 induction to typical A-T levels. All SV40-immortalized cell lines exhibited an absence of G1 arrest. Moreover, all SV40-immortalized cell lines exhibited increased apoptosis relative to primary cells in response to ionizing radiation, suggesting that SV40 immortalization results in a unique phenotype with regard to DNA damage responses. Copyright 1999 Academic Press.
    Keywords: Life Sciences (General)
    Type: Biochemical and biophysical research communications (ISSN 0006-291X); 257; 1; 168-76
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  • 6
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    Identification of defective illegitimate recombinational repair of oxidatively-induced DNA double-strand breaks in ataxia-telangiectasia cells (1997)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Ataxia-telangiectasia (A-T) is an autosomal-recessive lethal human disease. Homozygotes suffer from a number of neurological disorders, as well as very high cancer incidence. Heterozygotes may also have a higher than normal risk of cancer, particularly for the breast. The gene responsible for the disease (ATM) has been cloned, but its role in mechanisms of the disease remain unknown. Cellular A-T phenotypes, such as radiosensitivity and genomic instability, suggest that a deficiency in the repair of DNA double-strand breaks (DSBs) may be the primary defect; however, overall levels of DSB rejoining appear normal. We used the shuttle vector, pZ189, containing an oxidatively-induced DSB, to compare the integrity of DSB rejoining in one normal and two A-T fibroblast cells lines. Mutation frequencies were two-fold higher in A-T cells, and the mutational spectrum was different. The majority of the mutations found in all three cell lines were deletions (44-63%). The DNA sequence analysis indicated that 17 of the 17 plasmids with deletion mutations in normal cells occurred between short direct-repeat sequences (removing one of the repeats plus the intervening sequences), implicating illegitimate recombination in DSB rejoining. The combined data from both A-T cell lines showed that 21 of 24 deletions did not involve direct-repeats sequences, implicating a defect in the illegitimate recombination pathway. These findings suggest that the A-T gene product may either directly participate in illegitimate recombination or modulate the pathway. Regardless, this defect is likely to be important to a mechanistic understanding of this lethal disease.
    Keywords: Life Sciences (General)
    Type: Mutation research (ISSN 0027-5107); 384; 3; 169-79
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