Cited by 336Schizophrenia research and treatmentGenetic Associations and EpidemiologyEvolution and Genetic Dynamics

Fecundity of patients with schizophrenia, autism, bipolar disorder, depression, anorexia nervosa, or substance abuse vs their unaffected siblings

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Power, Robert A., Kyaga, Simon, Uher, Rudolf, MacCabe, James H., Långström, Niklas, Landen, Mikael, McGuffin, Peter, Lewis, Cathryn M. +2 more·2013·JAMA Psychiatry

Abstract

CONTEXT: It is unknown how genetic variants conferring liability to psychiatric disorders survive in the population despite strong negative selection. However, this is key to understanding their etiology and designing studies to identify risk variants. OBJECTIVES: To examine the reproductive fitness of patients with schizophrenia and other psychiatric disorders vs their unaffected siblings and to evaluate the level of selection on causal genetic variants. DESIGN: We measured the fecundity of patients with schizophrenia, autism, bipolar disorder, depression, anorexia nervosa, or substance abuse and their unaffected siblings compared with the general population. SETTING: Population databases in Sweden, including the Multi-Generation Register and the Swedish Hospital Discharge Register. PARTICIPANTS: In total, 2.3 million individuals among the 1950 to 1970 birth cohort in Sweden. MAIN OUTCOME MEASURES: Fertility ratio (FR), reflecting the mean number of children compared with that of the general population, accounting for age, sex, family size, and affected status. RESULTS: Except for women with depression, affected patients had significantly fewer children (FR range for those with psychiatric disorder, 0.23-0.93; P < 10-10). This reduction was consistently greater among men than women, suggesting that male fitness was particularly sensitive. Although sisters of patients with schizophrenia and bipolar disorder had increased fecundity (FR range, 1.02-1.03; P < .01), this was too small on its own to counterbalance the reduced fitness of affected patients. Brothers of patients with schizophrenia and autism showed reduced fecundity (FR range, 0.94-0.97; P < .001). Siblings of patients with depression and substance abuse had significantly increased fecundity (FR range, 1.01-1.05; P < 10-10). In the case of depression, this more than compensated for the lower fecundity of affected individuals. CONCLUSIONS: Our results suggest that strong selection exists against schizophrenia, autism, and anorexia nervosa and that these variants may be maintained by new mutations or an as-yet unknown mechanism. Bipolar disorder did not seem to be under strong negative selection. Vulnerability to depression, and perhaps substance abuse, may be preserved by balancing selection, suggesting the involvement of common genetic variants in ways that depend on other genes and on environment.

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Crossref · 10.1001/jamapsychiatry.2013.268

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  • The remaining Altai-matching variation has the strongest correlation with protective benefit against serious fitness-reducing diseases (anorexia and schizophrenia).

    “Supporting this interpretation, the remaining Altai-matching variation has the strongest correlation with protective benefit against serious fitness-reducing diseases (anorexia and schizophrenia)73.”

    From Quantifying the contribution of Neanderthal introgression to the heritability of complex traits (2021) · cites this paper as [73]

    The Anorexia Nervosa and Schizophrenia sections report reduced fecundity and negative selection associated with these disorders, supporting the description of them as fitness-reducing. The paper does not examine Altai-matching variation, protective benefit, or correlations with either disease, so it does not support the sentence’s central comparison. (LLM, conf=0.86)

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  • ASD is associated with reduced fecundity, so variation associated with it is subject to natural selection.

    “Because ASD is associated with reduced fecundity (Power et al., 2013), variation associated with it is subject to natural selection”
  • Other mental health disorders may contribute to a lower likelihood of having children.

    “Given that other mental health disorders may contribute to a lower likelihood of having children as evidenced by previous research, 8”
  • Because ASD individuals have reduced fecundity, target genes should be under severe purifying selection and have reduced load of disruptive variants.

    “Because individuals with ASD have drastically reduced fecundity (11), the net prediction is that these target genes should be under severe purifying selection, and hence have a reduced load of disruptive variants in the human gene pool.”
  • Disruptive mutations in autism genes face strong negative selection and are rapidly removed from the population.

    “Because individuals with ASD have lower fecundity, such mutations in autism genes would be under strong negative selection pressure.”

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Research works printed but not linked: 2

  1. [19]19. Daniels JL, Forssen U, Hultman CM, Cnattingius S, Savitz DA, Feychting M, Sparen P. Parental psychiatric disorders associated with autism spectrum disorders in the offspring [published correction appears in Pediatrics. 2008;122(5):1162]. Pediatrics. 2008;121(5):e1357-e1362 http://pediatrics.aappublications.org/content /121/5/e1357.long. Accessed March 27, 2012.
  2. [28]28. Statistics Sweden. Educational attainment of the population 2010: Stockholm has highest level of education [press release]. 2010. http://www.scb.se/Pages /PressRelease____315969.aspx. Accessed March 28, 2012.

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Authors
Power, R. A., Kyaga, S., Uher, R., MacCabe, J. H., Långström, N., Landen, M., McGuffin, P., Lewis, C. M., Lichtenstein, P., & Svensson, A. C.
Affiliations
King's College London (GB)
Corresponding author
Power, Robert A.
Venue
JAMA Psychiatry
Published
2013-01-01
Volume
70
Issue
1
Pages
22
ISSN
2168-622X (ISSN-L)
OpenAlex
W2034813336
Cited by
336
References
63
Citations by year
2026: 21 · 2025: 17 · 2024: 20 · 2023: 19 · 2022: 20 · 2021: 27 · 2020: 26 · 2019: 35 · 2018: 33 · 2017: 25 · 2016: 30 · 2015: 29 · 2014: 25 · 2013: 9
FWCI
14.34
Type
journal article
Language
en
Open access
Locations
  • JAMA Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Research Portal (King's College London) (submittedVersion, other-oa)
Funders
Karolinska Institutet
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
Keywords
fecundity, reproductive fitness, schizophrenia, autism spectrum disorder, bipolar disorder, depression, anorexia nervosa, substance abuse, siblings, natural selection, balancing selection, novel mutations, genetic susceptibility
MeSH terms
Adult, Anorexia Nervosa, Autistic Disorder, Mental Disorders, Bipolar Disorder, Depressive Disorder, Female, Fertility, Humans, Male, Middle Aged, Registries, Schizophrenia, Selection, Genetic, Sex Factors, Substance-Related Disorders, Siblings

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