Cited by 87Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration Mechanisms

Alzheimer's Disease: The Downside of a Highly Evolved Parietal Lobe?

Bruner, Emiliano, Jacobs, Heidi I.L.·2013·Journal of Alzheimer's Disease

Abstract

Clinical grade Alzheimer's disease (AD) is only described in humans. Recent imaging studies in early AD patients showed that the parietal areas display the most prominent metabolic impairments. So far, neuroimaging studies have not been able to explain why the medial parietal regions possess this hub characteristic in AD. Paleoneurological and neuroanatomical studies suggest that our species, Homo sapiens, has a unique and derived organization of the parietal areas, which are involved in higher cognitive functions. Combining evidence from neuroimaging, paleontology, and comparative anatomy, we suggest that the vulnerability of the parietal lobe to neurodegenerative processes may be associated with the origin of our species. The species-specific parietal morphology in modern humans largely influenced the brain spatial organization, and it involved changes in vascularization and energy management, which may underlie the sensitivity of these areas to metabolic impairment. Metabolic constraints and anatomical evolutionary changes in the medial parietal regions of modern humans may be important in early AD onset. Taking into account the species-specific adaptations of the modern human parietal areas and their association with AD, we hypothesize that AD can be the evolutionary drawback of the specialized structure of our parietal lobes. The cognitive advantage is associated with increased sensitivity to neurodegenerative processes which, being limited to the post-reproductive period, have a minor effect on the overall genetic fitness. The changes of energy requirements associated with form and size variations at the parietal areas may support the hypothesis of AD as a metabolic syndrome.

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Crossref · 10.3233/jad-122299

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  • Not all human-specific changes are beneficial; some may have had deleterious effects or side-effects, possibly increasing risks for neurodevelopmental or neurodegenerative disorders in humans.

    “while most mutations may be rather neutral and have little effect on the phenotype, some may have had deleterious effects or side-effects, possibly increasing the risks for neurodevelopmental or neurodegenerative disorders in humans46–48.”

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Authors
Bruner, E., & Jacobs, H. I. L.
Affiliations
  • Centro Nacional de Investigación sobre la Evolución Humana (ES)
  • Forschungszentrum Jülich (DE)
Corresponding author
Bruner, Emiliano
Venue
Journal of Alzheimer's Disease
Published
2013-04-17
Volume
35
Issue
2
Pages
227-240
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W118829763
Cited by
87
References
146
Citations by year
2026: 2 · 2025: 7 · 2024: 5 · 2023: 6 · 2022: 9 · 2021: 5 · 2020: 4 · 2019: 8 · 2018: 7 · 2017: 8 · 2016: 6 · 2015: 9 · 2014: 8 · 2013: 3
FWCI
6.13
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion)
  • Research Publications (Maastricht University) (submittedVersion)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, parietal lobe
MeSH terms
Alzheimer Disease, Brain, Biological Evolution, Humans, Parietal Lobe, Neuroimaging

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