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  • 1
    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
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  • 2
    Publication Date: 2017-06-16
    Description: The mechanistic target of rapamycin complex 1 (mTORC1) is recruited to the lysosome by Rag guanosine triphosphatases (GTPases) and regulates anabolic pathways in response to nutrients. We found that MiT/TFE transcription factors—master regulators of lysosomal and melanosomal biogenesis and autophagy—control mTORC1 lysosomal recruitment and activity by directly regulating the expression of RagD. In mice, this mechanism mediated adaptation to food availability after starvation and physical exercise and played an important role in cancer growth. Up-regulation of MiT/TFE genes in cells and tissues from patients and murine models of renal cell carcinoma, pancreatic ductal adenocarcinoma, and melanoma triggered RagD-mediated mTORC1 induction, resulting in cell hyperproliferation and cancer growth. Thus, this transcriptional regulatory mechanism enables cellular adaptation to nutrient availability and supports the energy-demanding metabolism of cancer cells.
    Keywords: Genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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