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==Causes==
==Causes==


The following are the causes of Alzheimer's dementia (AD):
The following are the causes of Alzheimer's dementia (AD):<ref name="urlAlzheimer Disease Overview - GeneReviews® - NCBI Bookshelf">{{cite web |url=https://www.ncbi.nlm.nih.gov/books/NBK1161/ |title=Alzheimer Disease Overview - GeneReviews® - NCBI Bookshelf |format= |work= |accessdate=}}</ref><ref name="pmid16966510">{{cite journal |vauthors=Brickell KL, Steinbart EJ, Rumbaugh M, Payami H, Schellenberg GD, Van Deerlin V, Yuan W, Bird TD |title=Early-onset Alzheimer disease in families with late-onset Alzheimer disease: a potential important subtype of familial Alzheimer disease |journal=Arch. Neurol. |volume=63 |issue=9 |pages=1307–11 |year=2006 |pmid=16966510 |doi=10.1001/archneur.63.9.1307 |url=}}</ref><ref name="pmid10441572">{{cite journal |vauthors=Campion D, Dumanchin C, Hannequin D, Dubois B, Belliard S, Puel M, Thomas-Anterion C, Michon A, Martin C, Charbonnier F, Raux G, Camuzat A, Penet C, Mesnage V, Martinez M, Clerget-Darpoux F, Brice A, Frebourg T |title=Early-onset autosomal dominant Alzheimer disease: prevalence, genetic heterogeneity, and mutation spectrum |journal=Am. J. Hum. Genet. |volume=65 |issue=3 |pages=664–70 |year=1999 |pmid=10441572 |pmc=1377972 |doi=10.1086/302553 |url=}}</ref><ref name="pmid11216203">{{cite journal |vauthors=Munoz DG, Feldman H |title=Causes of Alzheimer's disease |journal=CMAJ |volume=162 |issue=1 |pages=65–72 |year=2000 |pmid=11216203 |pmc=1232234 |doi= |url=}}</ref><ref name="pmid9848086">{{cite journal |vauthors=Hölscher C |title=Possible causes of Alzheimer's disease: amyloid fragments, free radicals, and calcium homeostasis |journal=Neurobiol. Dis. |volume=5 |issue=3 |pages=129–41 |year=1998 |pmid=9848086 |doi=10.1006/nbdi.1998.0193 |url=}}</ref>
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Revision as of 22:17, 17 September 2017

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Overview

Causes

The following are the causes of Alzheimer's dementia (AD):[1][2][3][4][5]

Cause Specific characteristics Percentage of cases
Chromosomal (Down syndrome)
  • Trisomy 21
  • Over expression of amylod precursor protein APP on chromosome 21 
  • Develop the neuropathologic hallmarks of AD after age 40 years
<1%
All familial ~25%
  • Late-onset familial (AD2)
  • APOE gene:
    • Locus: AD2
    • Protein: Apolipoprotein E
  • TREM2 gene:
    • Variant: p.Arg47His allelic variant
  • PLD3 gene
  • UNC5C gene
  • AKAP9 gene:
    • In African-Americans only
15%-25%
  • Early-onset familial AD (AD1, AD3, AD4)
  • PSEN1 gene:
    • Locus: AD3
    • Proportion: 20-70 % of early onset AD cases
    • Protein: Presenilin-1
  • PSEN2 gene:
    • Locus: AD4
    • Proportion: Rare
    • Protein: Presenilin-2
  • APP gene:
    • Locus: AD1
    • Proportion: 10-15 % of early onset AD cases
    • Protein: Amyloid precursor protein (APP)
<2%
Unknown (includes genetic/environment interactions)
  • Multifactorial: (combination of)
    • Aging
    • Genetic predisposition
    • Exposure to one or more environmental agents including head trauma, low education level, viruses, and/or toxins
~75%

References

  1. "Alzheimer Disease Overview - GeneReviews® - NCBI Bookshelf".
  2. Brickell KL, Steinbart EJ, Rumbaugh M, Payami H, Schellenberg GD, Van Deerlin V, Yuan W, Bird TD (2006). "Early-onset Alzheimer disease in families with late-onset Alzheimer disease: a potential important subtype of familial Alzheimer disease". Arch. Neurol. 63 (9): 1307–11. doi:10.1001/archneur.63.9.1307. PMID 16966510.
  3. Campion D, Dumanchin C, Hannequin D, Dubois B, Belliard S, Puel M, Thomas-Anterion C, Michon A, Martin C, Charbonnier F, Raux G, Camuzat A, Penet C, Mesnage V, Martinez M, Clerget-Darpoux F, Brice A, Frebourg T (1999). "Early-onset autosomal dominant Alzheimer disease: prevalence, genetic heterogeneity, and mutation spectrum". Am. J. Hum. Genet. 65 (3): 664–70. doi:10.1086/302553. PMC 1377972. PMID 10441572.
  4. Munoz DG, Feldman H (2000). "Causes of Alzheimer's disease". CMAJ. 162 (1): 65–72. PMC 1232234. PMID 11216203.
  5. Hölscher C (1998). "Possible causes of Alzheimer's disease: amyloid fragments, free radicals, and calcium homeostasis". Neurobiol. Dis. 5 (3): 129–41. doi:10.1006/nbdi.1998.0193. PMID 9848086.

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