Multivariate genome wide association and network analysis of subcortical imaging phenotypes in Alzheimer's disease.

Abstract:

BACKGROUND:Genome-wide association studies (GWAS) have identified many individual genes associated with brain imaging quantitative traits (QTs) in Alzheimer's disease (AD). However single marker level association discovery may not be able to address the underlying biological interactions with disease mechanism. RESULTS:In this paper, we used the MGAS (Multivariate Gene-based Association test by extended Simes procedure) tool to perform multivariate GWAS on eight AD-relevant subcortical imaging measures. We conducted multiple iPINBPA (integrative Protein-Interaction-Network-Based Pathway Analysis) network analyses on MGAS findings using protein-protein interaction (PPI) data, and identified five Consensus Modules (CMs) from the PPI network. Functional annotation and network analysis were performed on the identified CMs. The MGAS yielded significant hits within APOE, TOMM40 and APOC1 genes, which were known AD risk factors, as well as a few new genes such as LAMA1, XYLB, HSD17B7P2, and NPEPL1. The identified five CMs were enriched by biological processes related to disorders such as Alzheimer's disease, Legionellosis, Pertussis, and Serotonergic synapse. CONCLUSIONS:The statistical power of coupling MGAS with iPINBPA was higher than traditional GWAS method, and yielded new findings that were missed by GWAS. This study provides novel insights into the molecular mechanism of Alzheimer's Disease and will be of value to novel gene discovery and functional genomic studies.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Meng X,Li J,Zhang Q,Chen F,Bian C,Yao X,Yan J,Xu Z,Risacher SL,Saykin AJ,Liang H,Shen L,Alzheimer’s Disease Neuroimaging Initiative.

doi

10.1186/s12864-020-07282-7

subject

Has Abstract

pub_date

2020-12-29 00:00:00

pages

896

issue

Suppl 11

issn

1471-2164

pii

10.1186/s12864-020-07282-7

journal_volume

21

pub_type

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