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  • 1
    Publication Date: 2014-11-27
    Description: An inherited deficiency of the mitochondrial protein frataxin causes Friedreich's ataxia (FRDA); the mechanism by which this deficiency triggers neuro- and cardio-degeneration is unclear. Microarrays of neural tissue of animal models of the disease showed decreases in antioxidant genes, and increases in inflammatory genes. Cyclooxygenase (COX)-derived oxylipins are important mediators of inflammation. We measured oxylipin levels using tandem mass spectrometry and ELISAs in multiple cell and animal models of FRDA. Mass spectrometry revealed increases in concentrations of prostaglandins, thromboxane B2, 15-HETE and 11-HETE in cerebellar samples of knockin knockout mice. One possible explanation for the elevated oxylipins is that frataxin deficiency results in increased COX activity. While constitutive COX1 was unchanged, inducible COX2 expression was elevated over 1.35-fold ( P 〈 0.05) in two Friedreich's mouse models and Friedreich's lymphocytes. Consistent with higher COX2 expression, its activity was also increased by 58% over controls. COX2 expression is driven by multiple transcription factors, including activator protein 1 and cAMP response element-binding protein, both of which were elevated over 1.52-fold in cerebella. Taken together, the results support the hypothesis that reduced expression of frataxin leads to elevation of COX2-mediated oxylipin synthesis stimulated by increases in transcription factors that respond to increased reactive oxygen species. These findings support a neuroinflammatory mechanism in FRDA, which has both pathomechanistic and therapeutic implications.
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
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  • 2
    Publication Date: 2008-05-03
    Description: Genetic variation among individual humans occurs on many different scales, ranging from gross alterations in the human karyotype to single nucleotide changes. Here we explore variation on an intermediate scale--particularly insertions, deletions and inversions affecting from a few thousand to a few million base pairs. We employed a clone-based method to interrogate this intermediate structural variation in eight individuals of diverse geographic ancestry. Our analysis provides a comprehensive overview of the normal pattern of structural variation present in these genomes, refining the location of 1,695 structural variants. We find that 50% were seen in more than one individual and that nearly half lay outside regions of the genome previously described as structurally variant. We discover 525 new insertion sequences that are not present in the human reference genome and show that many of these are variable in copy number between individuals. Complete sequencing of 261 structural variants reveals considerable locus complexity and provides insights into the different mutational processes that have shaped the human genome. These data provide the first high-resolution sequence map of human structural variation--a standard for genotyping platforms and a prelude to future individual genome sequencing projects.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2424287/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2424287/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kidd, Jeffrey M -- Cooper, Gregory M -- Donahue, William F -- Hayden, Hillary S -- Sampas, Nick -- Graves, Tina -- Hansen, Nancy -- Teague, Brian -- Alkan, Can -- Antonacci, Francesca -- Haugen, Eric -- Zerr, Troy -- Yamada, N Alice -- Tsang, Peter -- Newman, Tera L -- Tuzun, Eray -- Cheng, Ze -- Ebling, Heather M -- Tusneem, Nadeem -- David, Robert -- Gillett, Will -- Phelps, Karen A -- Weaver, Molly -- Saranga, David -- Brand, Adrianne -- Tao, Wei -- Gustafson, Erik -- McKernan, Kevin -- Chen, Lin -- Malig, Maika -- Smith, Joshua D -- Korn, Joshua M -- McCarroll, Steven A -- Altshuler, David A -- Peiffer, Daniel A -- Dorschner, Michael -- Stamatoyannopoulos, John -- Schwartz, David -- Nickerson, Deborah A -- Mullikin, James C -- Wilson, Richard K -- Bruhn, Laurakay -- Olson, Maynard V -- Kaul, Rajinder -- Smith, Douglas R -- Eichler, Evan E -- 3 U54 HG002043/HG/NHGRI NIH HHS/ -- HG004120/HG/NHGRI NIH HHS/ -- P01 HG004120/HG/NHGRI NIH HHS/ -- P01 HG004120-01/HG/NHGRI NIH HHS/ -- U54 HG002043-07S1/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 May 1;453(7191):56-64. doi: 10.1038/nature06862.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genome Sciences and Howard Hughes Medical Institute, University of Washington, Seattle, Washington 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18451855" target="_blank"〉PubMed〈/a〉
    Keywords: Chromosome Inversion/genetics ; Continental Population Groups/genetics ; Euchromatin/genetics ; Gene Deletion ; Genetic Variation/*genetics ; Genome, Human/*genetics ; Geography ; Haplotypes ; Humans ; Mutagenesis, Insertional/genetics ; *Physical Chromosome Mapping ; Polymorphism, Single Nucleotide/genetics ; Reproducibility of Results ; *Sequence Analysis, DNA
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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