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Rhodes SL, Buchanan DD, Ahmed I, Taylor KD, Loriot MA, Sinsheimer JS, Bronstein JM, Elbaz A, Mellick GD, Rotter JI, Ritz B. Pooled analysis of iron-related genes in Parkinson's disease: association with transferrin. Neurobiol Dis 2013; 62:172-8. [PMID: 24121126 DOI: 10.1016/j.nbd.2013.09.019] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 08/31/2013] [Accepted: 09/27/2013] [Indexed: 01/04/2023] Open
Abstract
Pathologic features of Parkinson's disease (PD) include death of dopaminergic neurons in the substantia nigra, presence of α-synuclein containing Lewy bodies, and iron accumulation in PD-related brain regions. The observed iron accumulation may be contributing to PD etiology but it also may be a byproduct of cell death or cellular dysfunction. To elucidate the possible role of iron accumulation in PD, we investigated genetic variation in 16 genes related to iron homeostasis in three case-control studies from the United States, Australia, and France. After screening 90 haplotype tagging single nucleotide polymorphisms (SNPs) within the genes of interest in the US study population, we investigated the five most promising gene regions in two additional independent case-control studies. For the pooled data set (1289 cases, 1391 controls) we observed a protective association (OR=0.83, 95% CI: 0.71-0.96) between PD and a haplotype composed of the A allele at rs1880669 and the T allele at rs1049296 in transferrin (TF; GeneID: 7018). Additionally, we observed a suggestive protective association (OR=0.87, 95% CI: 0.74-1.02) between PD and a haplotype composed of the G allele at rs10247962 and the A allele at rs4434553 in transferrin receptor 2 (TFR2; GeneID: 7036). We observed no associations in our pooled sample for haplotypes in SLC40A1, CYB561, or HFE. Taken together with previous findings in model systems, our results suggest that TF or a TF-TFR2 complex may have a role in the etiology of PD, possibly through iron misregulation or mitochondrial dysfunction within dopaminergic neurons.
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Affiliation(s)
- Shannon L Rhodes
- Department of Epidemiology, UCLA Fielding School of Public Health, 650 Charles E. Young Drive S, Los Angeles, CA 90095-1772, USA.
| | - Daniel D Buchanan
- Cancer and Population Studies Group, Queensland Institute of Medical Research, 300 Herston Rd, Brisbane, QLD 4006, Australia; University of Queensland, School of Medicine, Brisbane, Australia; Princess Alexandra Hospital, Australia
| | - Ismaïl Ahmed
- Centre for Research in Epidemiology and Population Health, Biostatistics team, INSERM U1018, F-94276 le Kremlin Bicêtre, France; Univ Paris-Sud, UMRS 1018, F-94276 le Kremlin Bicêtre, France
| | - Kent D Taylor
- Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, 1124 West Carson, Bldg E5, Torrance, CA 90502, USA
| | - Marie-Anne Loriot
- Sorbonne Paris Cité, Université Paris Descartes, INSERM UMR-S 775, France; Assistance Publique Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Service de Biochimie, Unité Fonctionnelle de Pharmacogénétique et Oncologie Moléculaire, France
| | - Janet S Sinsheimer
- Department of Human Genetics, David Geffen School of Medicine at UCLA, 695 Charles E. Young Drive South, Box 708822, Los Angeles, CA 90095-7088, USA; Department of Biomathematics, David Geffen School of Medicine at UCLA, Box 951766, Room 5303 Life Sciences, Los Angeles, CA 90095-1766, USA; Department of Biostatistics, UCLA Fielding School of Public Health, 650 Charles E. Young Drive S, Los Angeles, CA 90095-1772, USA
| | - Jeff M Bronstein
- Department of Neurology, David Geffen School of Medicine at UCLA, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA
| | - Alexis Elbaz
- Centre for Research in Epidemiology and Population Health, Social and Occupational Determinants of Health, INSERM U1018, F-94807 Villejuif, France; Univ Versailles St-Quentin, UMRS 1018, F-94807, Villejuif France
| | - George D Mellick
- Eskitis Institute for Drug Discovery, Griffith University, Nathan 4111, Brisbane, Australia; Department of Neurology, Princess Alexandra Hospital, Brisbane, Australia
| | - Jerome I Rotter
- Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, 1124 West Carson, Bldg E5, Torrance, CA 90502, USA
| | - Beate Ritz
- Department of Epidemiology, UCLA Fielding School of Public Health, 650 Charles E. Young Drive S, Los Angeles, CA 90095-1772, USA; Department of Neurology, David Geffen School of Medicine at UCLA, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA; Department of Environmental Health Sciences, UCLA Fielding School of Public Health, 650 Charles E. Young Drive S, Los Angeles, CA 90095-1772, USA
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Blanco-Rojo R, Baeza-Richer C, López-Parra AM, Pérez-Granados AM, Brichs A, Bertoncini S, Buil A, Arroyo-Pardo E, Soria JM, Vaquero MP. Four variants in transferrin and HFE genes as potential markers of iron deficiency anaemia risk: an association study in menstruating women. Nutr Metab (Lond) 2011; 8:69. [PMID: 21978626 PMCID: PMC3195693 DOI: 10.1186/1743-7075-8-69] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Accepted: 10/06/2011] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Iron deficiency anaemia is a worldwide health problem in which environmental, physiologic and genetic factors play important roles. The associations between iron status biomarkers and single nucleotide polymorphisms (SNPs) known to be related to iron metabolism were studied in menstruating women. METHODS A group of 270 Caucasian menstruating women, a population group at risk of iron deficiency anaemia, participated in the study. Haematological and biochemical parameters were analysed and 10 selected SNPs were genotyped by minisequencing assay. The associations between genetic and biochemical data were analysed by Bayesian Model Averaging (BMA) test and decision trees. Dietary intake of a representative subgroup of these volunteers (n = 141) was assessed, and the relationship between nutrients and iron biomarkers was also determined by linear regression. RESULTS Four variants, two in the transferrin gene (rs3811647, rs1799852) and two in the HFE gene (C282Y, H63D), explain 35% of the genetic variation or heritability of serum transferrin in menstruating women. The minor allele of rs3811647 was associated with higher serum transferrin levels and lower transferrin saturation, while the minor alleles of rs1799852 and the C282Y and H63D mutations of HFE were associated with lower serum transferrin levels. No association between nutrient intake and iron biomarkers was found. CONCLUSIONS In contrast to dietary intake, these four SNPs are strongly associated with serum transferrin. Carriers of the minor allele of rs3811647 present a reduction in iron transport to tissues, which might indicate higher iron deficiency anaemia risk, although the simultaneous presence of the minor allele of rs1799852 and HFE mutations appear to have compensatory effects. Therefore, it is suggested that these genetic variants might potentially be used as markers of iron deficiency anaemia risk.
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Affiliation(s)
- Ruth Blanco-Rojo
- Department of Metabolism and Nutrition, Institute of Food Science and Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), Madrid, Spain
| | - Carlos Baeza-Richer
- Department of Toxicology and Health Legislation, Faculty of Medicine, Complutense University of Madrid, Spain
| | - Ana M López-Parra
- Department of Toxicology and Health Legislation, Faculty of Medicine, Complutense University of Madrid, Spain
| | - Ana M Pérez-Granados
- Department of Metabolism and Nutrition, Institute of Food Science and Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), Madrid, Spain
| | - Anna Brichs
- Unit of Genomic of Complex Diseases, Institute of Biomedical Research (II-B Sant Pau), Barcelona, Spain
| | - Stefania Bertoncini
- Department of Toxicology and Health Legislation, Faculty of Medicine, Complutense University of Madrid, Spain
- Department of Biology, University of Pisa, Pisa, Italy
| | - Alfonso Buil
- Unit of Genomic of Complex Diseases, Institute of Biomedical Research (II-B Sant Pau), Barcelona, Spain
| | - Eduardo Arroyo-Pardo
- Department of Toxicology and Health Legislation, Faculty of Medicine, Complutense University of Madrid, Spain
| | - Jose M Soria
- Unit of Genomic of Complex Diseases, Institute of Biomedical Research (II-B Sant Pau), Barcelona, Spain
| | - M Pilar Vaquero
- Department of Metabolism and Nutrition, Institute of Food Science and Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), Madrid, Spain
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McLaren CE, Garner CP, Constantine CC, McLachlan S, Vulpe CD, Snively BM, Gordeuk VR, Nickerson DA, Cook JD, Leiendecker-Foster C, Beckman KB, Eckfeldt JH, Barcellos LF, Murray JA, Adams PC, Acton RT, Killeen AA, McLaren GD. Genome-wide association study identifies genetic loci associated with iron deficiency. PLoS One 2011; 6:e17390. [PMID: 21483845 PMCID: PMC3069025 DOI: 10.1371/journal.pone.0017390] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Accepted: 02/02/2011] [Indexed: 12/27/2022] Open
Abstract
The existence of multiple inherited disorders of iron metabolism in man, rodents and other vertebrates suggests genetic contributions to iron deficiency. To identify new genomic locations associated with iron deficiency, a genome-wide association study (GWAS) was performed using DNA collected from white men aged≥25 y and women≥50 y in the Hemochromatosis and Iron Overload Screening (HEIRS) Study with serum ferritin (SF)≤12 µg/L (cases) and iron replete controls (SF>100 µg/L in men, SF>50 µg/L in women). Regression analysis was used to examine the association between case-control status (336 cases, 343 controls) and quantitative serum iron measures and 331,060 single nucleotide polymorphism (SNP) genotypes, with replication analyses performed in a sample of 71 cases and 161 controls from a population of white male and female veterans screened at a US Veterans Affairs (VA) medical center. Five SNPs identified in the GWAS met genome-wide statistical significance for association with at least one iron measure, rs2698530 on chr. 2p14; rs3811647 on chr. 3q22, a known SNP in the transferrin (TF) gene region; rs1800562 on chr. 6p22, the C282Y mutation in the HFE gene; rs7787204 on chr. 7p21; and rs987710 on chr. 22q11 (GWAS observed P<1.51×10(-7) for all). An association between total iron binding capacity and SNP rs3811647 in the TF gene (GWAS observed P=7.0×10(-9), corrected P=0.012) was replicated within the VA samples (observed P=0.012). Associations with the C282Y mutation in the HFE gene also were replicated. The joint analysis of the HEIRS and VA samples revealed strong associations between rs2698530 on chr. 2p14 and iron status outcomes. These results confirm a previously-described TF polymorphism and implicate one potential new locus as a target for gene identification.
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Affiliation(s)
- Christine E McLaren
- Department of Epidemiology, University of California Irvine, Irvine, California, United States of America.
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Zimmermann MB, Harrington M, Villalpando S, Hurrell RF. Nonheme-iron absorption in first-degree relatives is highly correlated: a stable-isotope study in mother-child pairs. Am J Clin Nutr 2010; 91:802-7. [PMID: 20016013 DOI: 10.3945/ajcn.2009.28800] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Iron absorption in humans is highly variable even after iron status and dietary components that influence iron absorption are controlled for. Inherited factors may help explain this variance. OBJECTIVE Our objective was to compare nonheme-iron absorption from a noninhibitory, stable-isotope-labeled test meal in preschool-aged children and their mothers. DESIGN We provided 72 test meals based on degermed maize flour and milk powder and fortified with [(57)Fe]ferrous fumarate or [(58)Fe]ferrous sulfate to healthy Mexican preschool children [n = 18; mean (+/-SD) age: 3.6 +/- 1.0 y] and their mothers [n = 18; mean (+/-SD) age: 28.0 +/- 5.2 y]. Iron absorption was calculated on the basis of incorporation of isotopes into erythrocytes after 14 d and was adjusted for differences in iron status. RESULTS There was a wide variation in iron absorption from the test meals: in the mothers and children, the median fractional absorption of ferrous sulfate was 22.55% (range: 1.65-54.83%) and 5.51% (range: 2.23-17.20%), respectively (P < 0.0001). After adjustment for serum ferritin, the significant difference in absorption between mothers and their children disappeared. Despite this broad range of iron absorption, corrected fractional iron absorption from the ferrous fumarate-fortified (r(2) = 0.582) and the ferrous sulfate-fortified test meals (r(2) = 0.557) was strongly correlated in mothers and their children (P < 0.0001). There was a striking positive correlation between the mean corrected fractional iron absorption from both test meals in mothers and their children (r(2) = 0.782, P < 0.0001). In regression analyses that included age, sex, and hemoglobin, the only significant predictor of corrected fractional iron absorption in children was corrected fractional iron absorption in their mothers (standardized beta = 0.884, P < 0.001). CONCLUSIONS Nonheme-iron absorption exhibits a strong familial tendency. After differences in meal matrix and serum ferritin are accounted for, these data suggest that inheritance and/or shared environmental factors explain most of the variance in dietary iron absorption.
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Sarria B, Navas-Carretero S, Lopez-Parra AM, Perez-Granados AM, Arroyo-Pardo E, Roe MA, Teucher B, Vaquero MP, Fairweather-Tait SJ. The G277S transferrin mutation does not affect iron absorption in iron deficient women. Eur J Nutr 2007; 46:57-60. [PMID: 17206377 DOI: 10.1007/s00394-006-0631-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2006] [Accepted: 11/07/2006] [Indexed: 11/30/2022]
Abstract
BACKGROUND Iron deficiency anaemia is one of the most important nutritional diseases, with high prevalence worldwide. The G277S transferrin mutation has been implicated as a risk factor for iron deficiency in menstruating women. However, the subject is controversial and there are no data concerning the possible influence of this polymorphism on iron absorption. AIM OF THE STUDY To undertake a pilot study to investigate the effect of carrying the G277S transferrin mutation on non-haem iron absorption from a meal in young menstruating women compared to wild-type controls. METHODS Menstruating women with low iron stores (serum ferritin < 30 microg/l) or who had suffered from iron deficiency anaemia or had a family history of anaemia were recruited (n = 162). Haematological parameters were analysed, including haemoglobin, ferritin, total-iron binding capacity and transferrin saturation. Non-haem iron absorption from a meal was measured in 25 non-anaemic women either with the G277S/G277G (n = 10) or the wild type G277G/G277G (n = 15) genotype. The incorporation of stable isotopes of iron into erythrocytes was used to measure absorption. RESULTS AND CONCLUSIONS There were no significant differences in iron status indices or non-haem iron absorption between genotypes. However, G277S carriers did not show the usual inverse association between iron stores and non-haem iron absorption. Further studies should focus on the effects of a combination of polymorphisms in iron metabolism genes on iron absorption.
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Affiliation(s)
- Beatriz Sarria
- Department of Metabolism and Nutrition, Instituto del Frio, Spanish Council for Scientific Research (CSIC), C/ Jose Antonio Novais 10., 28040 Madrid, Spain
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