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Meta-Analysis
. 2014 Nov;71(11):1394-404.
doi: 10.1001/jamaneurol.2014.1491.

Effects of multiple genetic loci on age at onset in late-onset Alzheimer disease: a genome-wide association study

Adam C Naj  1 Gyungah Jun  2 Christiane Reitz  3 Brian W Kunkle  4 William Perry  4 Yo Son Park  5 Gary W Beecham  6 Ruchita A Rajbhandary  4 Kara L Hamilton-Nelson  4 Li-San Wang  7 John S K Kauwe  8 Matthew J Huentelman  9 Amanda J Myers  10 Thomas D Bird  11 Bradley F Boeve  12 Clinton T Baldwin  13 Gail P Jarvik  14 Paul K Crane  15 Ekaterina Rogaeva  16 M Michael Barmada  17 F Yesim Demirci  17 Carlos Cruchaga  18 Patricia L Kramer  19 Nilufer Ertekin-Taner  20 John Hardy  21 Neill R Graff-Radford  20 Robert C Green  22 Eric B Larson  23 Peter H St George-Hyslop  24 Joseph D Buxbaum  25 Denis A Evans  26 Julie A Schneider  27 Kathryn L Lunetta  28 M Ilyas Kamboh  29 Andrew J Saykin  30 Eric M Reiman  31 Philip L De Jager  32 David A Bennett  33 John C Morris  34 Thomas J Montine  35 Alison M Goate  18 Deborah Blacker  36 Debby W Tsuang  37 Hakon Hakonarson  38 Walter A Kukull  39 Tatiana M Foroud  40 Eden R Martin  6 Jonathan L Haines  41 Richard P Mayeux  42 Lindsay A Farrer  43 Gerard D Schellenberg  7 Margaret A Pericak-Vance  6 Alzheimer Disease Genetics ConsortiumMarilyn S Albert  44 Roger L Albin  45 Liana G Apostolova  46 Steven E Arnold  47 Robert Barber  48 Lisa L Barnes  49 Thomas G Beach  50 James T Becker  51 Duane Beekly  52 Eileen H Bigio  53 James D Bowen  54 Adam Boxer  55 James R Burke  56 Nigel J Cairns  57 Laura B Cantwell  7 Chuanhai Cao  58 Chris S Carlson  59 Regina M Carney  10 Minerva M Carrasquillo  60 Steven L Carroll  61 Helena C Chui  62 David G Clark  63 Jason Corneveaux  9 David H Cribbs  64 Elizabeth A Crocco  10 Charles DeCarli  65 Steven T DeKosky  66 Malcolm Dick  67 Dennis W Dickson  60 Ranjan Duara  68 Kelley M Faber  40 Kenneth B Fallon  61 Martin R Farlow  69 Steven Ferris  70 Matthew P Frosch  71 Douglas R Galasko  72 Mary Ganguli  73 Marla Gearing  74 Daniel H Geschwind  75 Bernardino Ghetti  76 John R Gilbert  6 Jonathan D Glass  77 John H Growdon  78 Ronald L Hamilton  79 Lindy E Harrell  63 Elizabeth Head  80 Lawrence S Honig  81 Christine M Hulette  82 Bradley T Hyman  78 Gregory A Jicha  83 Lee-Way Jin  84 Anna Karydas  55 Jeffrey A Kaye  85 Ronald Kim  86 Edward H Koo  72 Neil W Kowall  87 Joel H Kramer  88 Frank M LaFerla  89 James J Lah  77 James B Leverenz  35 Allan I Levey  77 Ge Li  90 Andrew P Lieberman  91 Chiao-Feng Lin  7 Oscar L Lopez  92 Constantine G Lyketsos  93 Wendy J Mack  94 Frank Martiniuk  95 Deborah C Mash  96 Eliezer Masliah  97 Wayne C McCormick  15 Susan M McCurry  98 Andrew N McDavid  59 Ann C McKee  87 Marsel Mesulam  99 Bruce L Miller  55 Carol A Miller  100 Joshua W Miller  84 Jill R Murrell  101 John M Olichney  65 Vernon S Pankratz  102 Joseph E Parisi  103 Henry L Paulson  104 Elaine Peskind  90 Ronald C Petersen  12 Aimee Pierce  64 Wayne W Poon  67 Huntington Potter  58 Joseph F Quinn  105 Ashok Raj  58 Murray Raskind  90 Barry Reisberg  106 John M Ringman  46 Erik D Roberson  63 Howard J Rosen  55 Roger N Rosenberg  107 Mary Sano  108 Lon S Schneider  109 William W Seeley  55 Amanda G Smith  58 Joshua A Sonnen  35 Salvatore Spina  76 Robert A Stern  110 Rudolph E Tanzi  78 Tricia A Thornton-Wells  111 John Q Trojanowski  7 Juan C Troncoso  112 Otto Valladares  7 Vivianna M Van Deerlin  7 Linda J Van Eldik  113 Badri N Vardarajan  114 Harry V Vinters  115 Jean Paul Vonsattel  116 Sandra Weintraub  117 Kathleen A Welsh-Bohmer  118 Jennifer Williamson  81 Sarah Wishnek  4 Randall L Woltjer  119 Clinton B Wright  120 Steven G Younkin  60 Chang-En Yu  15 Lei Yu  121
Affiliations
Meta-Analysis

Effects of multiple genetic loci on age at onset in late-onset Alzheimer disease: a genome-wide association study

Adam C Naj et al. JAMA Neurol. 2014 Nov.

Erratum in

  • JAMA Neurol. 2014 Nov;71(11):1457

Abstract

Importance: Because APOE locus variants contribute to risk of late-onset Alzheimer disease (LOAD) and to differences in age at onset (AAO), it is important to know whether other established LOAD risk loci also affect AAO in affected participants.

Objectives: To investigate the effects of known Alzheimer disease risk loci in modifying AAO and to estimate their cumulative effect on AAO variation using data from genome-wide association studies in the Alzheimer Disease Genetics Consortium.

Design, setting, and participants: The Alzheimer Disease Genetics Consortium comprises 14 case-control, prospective, and family-based data sets with data on 9162 participants of white race/ethnicity with Alzheimer disease occurring after age 60 years who also had complete AAO information, gathered between 1989 and 2011 at multiple sites by participating studies. Data on genotyped or imputed single-nucleotide polymorphisms most significantly associated with risk at 10 confirmed LOAD loci were examined in linear modeling of AAO, and individual data set results were combined using a random-effects, inverse variance-weighted meta-analysis approach to determine whether they contribute to variation in AAO. Aggregate effects of all risk loci on AAO were examined in a burden analysis using genotype scores weighted by risk effect sizes.

Main outcomes and measures: Age at disease onset abstracted from medical records among participants with LOAD diagnosed per standard criteria.

Results: Analysis confirmed the association of APOE with earlier AAO (P = 3.3 × 10(-96)), with associations in CR1 (rs6701713, P = 7.2 × 10(-4)), BIN1 (rs7561528, P = 4.8 × 10(-4)), and PICALM (rs561655, P = 2.2 × 10(-3)) reaching statistical significance (P < .005). Risk alleles individually reduced AAO by 3 to 6 months. Burden analyses demonstrated that APOE contributes to 3.7% of the variation in AAO (R(2) = 0.256) over baseline (R(2) = 0.221), whereas the other 9 loci together contribute to 2.2% of the variation (R(2) = 0.242).

Conclusions and relevance: We confirmed an association of APOE (OMIM 107741) variants with AAO among affected participants with LOAD and observed novel associations of CR1 (OMIM 120620), BIN1 (OMIM 601248), and PICALM (OMIM 603025) with AAO. In contrast to earlier hypothetical modeling, we show that the combined effects of Alzheimer disease risk variants on AAO are on the scale of, but do not exceed, the APOE effect. While the aggregate effects of risk loci on AAO may be significant, additional genetic contributions to AAO are individually likely to be small.

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Figures

Figure 1
Figure 1. Boxplots for age-at-onset (AAO) by ADGC dataset

References

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