Evidence map›Paper›PMID 32211498›Full record

ArticleAlzheimer's & dementia (Amsterdam, Netherlands)2020

APOE4 moderates effects of cortical iron on synchronized default mode network activity in cognitively healthy old-aged adults.

Sonja M Kagerer, Jiri M G van Bergen, Xu Li, Frances C Quevenco, Anton F Gietl, Sandro Studer, Valerie Treyer, Rafael Meyer, Philipp A Kaufmann, Roger M Nitsch and 3 more

Open access · goldAbstract read
In one paragraph

Article in Alzheimer's & dementia (Amsterdam, Netherlands), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed, 1 pooled it
2.8field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

29 citing papers in PubMed, 1 synthesis or guideline pooled it, 36 citations in OpenAlex.

  1. Pooled it
  2. Brain iron distribution in transdiagnostic mental health burden.PCN reports : psychiatry and clinical neurosciences · 2025
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  8. The Azalea Hypothesis of Alzheimer Disease: A Functional Iron Deficiency Promotes Neurodegeneration.The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry · 2024
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors at 8 institutions in 3 countries.

Sonja M KagererInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Jiri M G van BergenInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Xu LiThe Russell H. Morgan Department of Radiology and Radiological Science Division of MR Research The Johns Hopkins University School of Medicine Baltimore Maryland USA.
Frances C QuevencoInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Anton F GietlInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Sandro StuderInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Valerie TreyerInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Rafael MeyerInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Philipp A KaufmannDepartment of Nuclear Medicine University Hospital Zurich and University of Zurich Zurich Switzerland.
Roger M NitschInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Peter C M van ZijlThe Russell H. Morgan Department of Radiology and Radiological Science Division of MR Research The Johns Hopkins University School of Medicine Baltimore Maryland USA.
Christoph HockInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
Paul G UnschuldInstitute for Regenerative Medicine University of Zurich Zurich Switzerland.
University of Zurich · CHSwiss Institute for Regenerative Medicine · CHUniversity Psychiatric Hospital · SIETH Zurich · CHJohns Hopkins Medicine · USJohns Hopkins University · USLight Chain Bioscience (Switzerland) · CHUniversity Hospital of Zurich · CH

Funding

TR&D 4: Algorithms for functional and anatomical brain analysisP41EB015909 · NIBIB · HUGO W. MOSER RES INST KENNEDY KRIEGER · PI VAN ZIJL, PETER CM · 2012 to 2020
$13.1M
NIBIB NIH HHS P41 EB015909
6 · The paper itself

Abstract

introductionApolipoprotein E ε4 (APOE4)-related genetic risk for sporadic Alzheimer's disease is associated with an early impairment of cognitive brain networks. The current study determines relationships between APOE4 carrier status, cortical iron, and cortical network-functionality.

methodsSixty-nine cognitively healthy old-aged individuals (mean age [SD] 66.1 [± 7.2] years; Mini-Mental State Exam [MMSE] 29.3 ± 1.1) were genotyped for APOE4 carrier-status and received 3 Tesla magnetic resonance imaging (MRI) for blood oxygen level-dependent functional magnetic resonance imaging (MRI) at rest, three-dimensional (3D)-gradient echo (six echoes) for cortical gray-matter, non-heme iron by quantitative susceptibility mapping, and 18F-flutemetamol positron emission tomography for amyloid-β.

resultsA spatial pattern consistent with the default mode network (DMN) could be identified by independent component analysis. DMN activity was enhanced in APOE4 carriers and related to cortical iron burden. APOE4 and cortical iron synergistically interacted with DMN activity. Secondary analysis revealed a positive, APOE4 associated, relationship between cortical iron and DMN connectivity. DISCUSSION: Our findings suggest that APOE4 moderates effects of iron on brain functionality prior to manifestation of cognitive impairment.

Indexed as

APOE4DMNflutemetamolfMRIgradient echoICAironMRIPETpreclinical Alzheimer's diseaseQSM

Identifiers

PMID32211498
PMCPMC7085281
OpenAlexW3006144438

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.