Mapping the multicausality of Alzheimer’s disease through group model building

Jeroen F. Uleman*, René J.F. Melis, Rick Quax, Eddy A. van der Zee, Dick Thijssen, Martin Dresler, Ondine van de Rest, Isabelle F. van der Velpen, Hieab H.H. Adams, Ben Schmand, Inge M.C.M. de Kok, Jeroen de Bresser, Edo Richard, Marcel Verbeek, Alfons G. Hoekstra, Etiënne A.J.A. Rouwette, Marcel G.M. Olde Rikkert

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Alzheimer’s disease (AD) is a complex, multicausal disorder involving several spatiotemporal scales and scientific domains. While many studies focus on specific parts of this system, the complexity of AD is rarely studied as a whole. In this work, we apply systems thinking to map out known causal mechanisms and risk factors ranging from intracellular to psychosocial scales in sporadic AD. We report on the first systemic causal loop diagram (CLD) for AD, which is the result of an interdisciplinary group model building (GMB) process. The GMB was based on the input of experts from multiple domains and all proposed mechanisms were supported by scientific literature. The CLD elucidates interaction and feedback mechanisms that contribute to cognitive decline from midlife onward as described by the experts. As an immediate outcome, we observed several non-trivial reinforcing feedback loops involving factors at multiple spatial scales, which are rarely considered within the same theoretical framework. We also observed high centrality for modifiable risk factors such as social relationships and physical activity, which suggests they may be promising leverage points for interventions. This illustrates how a CLD from an interdisciplinary GMB process may lead to novel insights into complex disorders. Furthermore, the CLD is the first step in the development of a computational model for simulating the effects of risk factors on AD.

Original languageEnglish
Pages (from-to)829-843
JournalGeroScience
Volume43
Issue number2
Early online date11 Aug 2020
DOIs
Publication statusPublished - 2021

Keywords

  • Alzheimer’s disease
  • Causal loop diagram
  • Centrality
  • Complexity
  • Group model building
  • Multicausal
  • Systems thinking

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