Cited by 48Genetic Associations and EpidemiologySchizophrenia research and treatmentMental Health Research Topics

Genetic and phenotypic similarity across major psychiatric disorders: a systematic review and quantitative assessment

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Bourque, Vincent-Raphael, Poulain, Cécile, Proulx, Catherine, Moreau, Clara A., Joober, Ridha, Forgeot d’Arc, Baudouin, Huguet, Guillaume, Jacquemont, Sébastien·2024·Translational Psychiatry

Abstract

There is widespread overlap across major psychiatric disorders, and this is the case at different levels of observations, from genetic variants to brain structures and function and to symptoms. However, it remains unknown to what extent these commonalities at different levels of observation map onto each other. Here, we systematically review and compare the degree of similarity between psychiatric disorders at all available levels of observation. We searched PubMed and EMBASE between January 1, 2009 and September 8, 2022. We included original studies comparing at least four of the following five diagnostic groups: Schizophrenia, Bipolar Disorder, Major Depressive Disorder, Autism Spectrum Disorder, and Attention Deficit Hyperactivity Disorder, with measures of similarities between all disorder pairs. Data extraction and synthesis were performed by two independent researchers, following the PRISMA guidelines. As main outcome measure, we assessed the Pearson correlation measuring the degree of similarity across disorders pairs between studies and biological levels of observation. We identified 2975 studies, of which 28 were eligible for analysis, featuring similarity measures based on single-nucleotide polymorphisms, gene-based analyses, gene expression, structural and functional connectivity neuroimaging measures. The majority of correlations (88.6%) across disorders between studies, within and between levels of observation, were positive. To identify a consensus ranking of similarities between disorders, we performed a principal component analysis. Its first dimension explained 51.4% (95% CI: 43.2, 65.4) of the variance in disorder similarities across studies and levels of observation. Based on levels of genetic correlation, we estimated the probability of another psychiatric diagnosis in first-degree relatives and showed that they were systematically lower than those observed in population studies. Our findings highlight that genetic and brain factors may underlie a large proportion, but not all of the diagnostic overlaps observed in the clinic.

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  • Neurological diseases share symptomatic and molecular changes including memory loss and protein aggregation in various dementia types and genetic overlap and comorbidity across psychiatric disorders.

    “Neurological diseases share symptomatic and molecular changes including memory loss and protein aggregation in various dementia types (17) and genetic overlap and comorbidity across psychiatric disorders (18).”

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Authors
Bourque, V.-R., Poulain, C., Proulx, C., Moreau, C. A., Joober, R., Forgeot d’Arc, B., Huguet, G., & Jacquemont, S.
Affiliations
  • Centre Hospitalier Universitaire Sainte-Justine (CA)
  • University of Southern California (US)
  • Douglas Mental Health University Institute (CA)
Corresponding author
Jacquemont, Sébastien
Venue
Translational Psychiatry
Published
2024-03-30
Volume
14
Issue
1
Pages
171-171
ISSN
2158-3188 (ISSN-L)
OpenAlex
W4393336971
Cited by
48
References
10
Citations by year
2026: 26 · 2025: 18 · 2024: 4
FWCI
3.08
Type
journal article
Language
en
Open access
Locations
  • Translational Psychiatry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health
  • Canadian Institutes of Health Research
  • National Institute of Mental Health (U01MH119739, U01MH119690, R01MH129858, R37MH085953)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Mental Health Research Topics
Keywords
mental illness, genetic overlap, phenotypic similarity, schizophrenia, bipolar disorder, major depressive disorder, autism spectrum disorder, attention deficit hyperactivity disorder, single nucleotide polymorphisms, gene expression, structural connectivity, functional connectivity, first-degree relatives, diagnostic overlap
MeSH terms
Autism Spectrum Disorder, Attention Deficit Disorder with Hyperactivity, Mental Disorders, Bipolar Disorder, Brain, Major Depressive Disorder, Humans, Phenotype, Schizophrenia, Polymorphism, Single Nucleotide

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