Association of Mitochondrial Variants and Haplogroups Identified by Whole Exome Sequencing with Alzheimer's Disease

Overview

Journal Alzheimers Dement

Specialties Neurology
Psychiatry

Date 2021 Jun 21

PMID 34152079

Citations 13

Authors

Xiaoling Zhang

John J Farrell

Tong Tong

Junming Hu

Congcong Zhu

Li-San Wang

Richard Mayeux

Jonathan L Haines

Margaret A Pericak-Vance

Gerard D Schellenberg

Kathryn L Lunetta

Lindsay A Farrer

Affiliations

Soon will be listed here.

Abstract

Introduction: Findings regarding the association between mitochondrial DNA (mtDNA) variants and Alzheimer's disease (AD) are inconsistent.

Methods: We developed a pipeline for accurate assembly and variant calling in mitochondrial genomes embedded within whole exome sequences (WES) from 10,831 participants from the Alzheimer's Disease Sequencing Project (ADSP). Association of AD risk was evaluated with each mtDNA variant and variants located in 1158 nuclear genes related to mitochondrial function using the SCORE test. Gene-based tests were performed using SKAT-O.

Results: Analysis of 4220 mtDNA variants revealed study-wide significant association of AD with a rare MT-ND4L variant (rs28709356 C>T; minor allele frequency = 0.002; P = 7.3 × 10 ) as well as with MT-ND4L in a gene-based test (P = 6.71 × 10 ). Significant association was also observed with a MT-related nuclear gene, TAMM41, in a gene-based test (P = 2.7 × 10 ). The expression of TAMM41 was lower in AD cases than controls (P = .00046) or mild cognitive impairment cases (P = .03).

Discussion: Significant findings in MT-ND4L and TAMM41 provide evidence for a role of mitochondria in AD.

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