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The genetics of Alzheimer's disease

Authors Bagyinszky E, Youn YC, An SSA, Kim S

Received 15 July 2013

Accepted for publication 9 August 2013

Published 1 April 2014 Volume 2014:9 Pages 535—551


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Eva Bagyinszky,1 Young Chul Youn,2 Seong Soo A An,1,* SangYun Kim3,*

1Department of BioNano Technology Gachon University, Gyeonggi-do, 2Department of Neurology, Chung-Ang University College of Medicine, Seoul, 3Department of Neurology, Seoul National University Budang Hospital, Gyeonggi-do, South Korea

*These authors contributed equally to this work

Abstract: Alzheimer's disease (AD) is a complex and heterogeneous neurodegenerative disorder, classified as either early onset (under 65 years of age), or late onset (over 65 years of age). Three main genes are involved in early onset AD: amyloid precursor protein (APP), presenilin 1 (PSEN1), and presenilin 2 (PSEN2). The apolipoprotein E (APOE) E4 allele has been found to be a main risk factor for late-onset Alzheimer's disease. Additionally, genome-wide association studies (GWASs) have identified several genes that might be potential risk factors for AD, including clusterin (CLU), complement receptor 1 (CR1), phosphatidylinositol binding clathrin assembly protein (PICALM), and sortilin-related receptor (SORL1). Recent studies have discovered additional novel genes that might be involved in late-onset AD, such as triggering receptor expressed on myeloid cells 2 (TREM2) and cluster of differentiation 33 (CD33). Identification of new AD-related genes is important for better understanding of the pathomechanisms leading to neurodegeneration. Since the differential diagnoses of neurodegenerative disorders are difficult, especially in the early stages, genetic testing is essential for diagnostic processes. Next-generation sequencing studies have been successfully used for detecting mutations, monitoring the epigenetic changes, and analyzing transcriptomes. These studies may be a promising approach toward understanding the complete genetic mechanisms of diverse genetic disorders such as AD.

Keywords: dementia, amyloid precursor protein, presenilin 1, presenilin 2, APOE, mutation, diagnosis, genetic testing

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