Genetic influences on political ideologies

Twin analyses of 19 measures of political ideologies from five democracies and genome-wide findings from three populations

Peter K. Hatemi, Sarah E. Medland, Robert Klemmensen, Sven Oskarsson, Levente Littvay, Christopher T. Dawes, Brad Verhulst, Rose McDermott, Asbjørn Sonne Nørgaard, Casey A. Klofstad, Kaare Christensen, Magnus Johannesson, Patrik K.E. Magnusson, Lindon J. Eaves, Nicholas G. Martin

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Almost 40 years ago, evidence from large studies of adult twins and their relatives suggested that between 30 and 60 % of the variance in social and political attitudes could be explained by genetic influences. However, these findings have not been widely accepted or incorporated into the dominant paradigms that explain the etiology of political ideology. This has been attributed in part to measurement and sample limitations, as well the relative absence of molecular genetic studies. Here we present results from original analyses of a combined sample of over 12,000 twins pairs, ascertained from nine different studies conducted in five democracies, sampled over the course of four decades. We provide evidence that genetic factors play a role in the formation of political ideology, regardless of how ideology is measured, the era, or the population sampled. The only exception is a question that explicitly uses the phrase "Left-Right". We then present results from one of the first genome-wide association studies on political ideology using data from three samples: a 1990 Australian sample involving 6,894 individuals from 3,516 families; a 2008 Australian sample of 1,160 related individuals from 635 families and a 2010 Swedish sample involving 3,334 individuals from 2,607 families. No polymorphisms reached genome-wide significance in the meta-analysis. The combined evidence suggests that political ideology constitutes a fundamental aspect of one's genetically informed psychological disposition, but as Fisher proposed long ago, genetic influences on complex traits will be composed of thousands of markers of very small effects and it will require extremely large samples to have enough power in order to identify specific polymorphisms related to complex social traits.

Original languageEnglish (US)
Pages (from-to)282-294
Number of pages13
JournalBehavior Genetics
Volume44
Issue number3
DOIs
StatePublished - Jan 1 2014

Fingerprint

political ideology
Democracy
democracy
genome
Genome
Population
polymorphism
sampling
Twin Studies
Genome-Wide Association Study
etiology
meta-analysis
ideology
Meta-Analysis
Molecular Biology
genetic polymorphism
Psychology
molecular genetics
family

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Genetics(clinical)

Cite this

Hatemi, Peter K. ; Medland, Sarah E. ; Klemmensen, Robert ; Oskarsson, Sven ; Littvay, Levente ; Dawes, Christopher T. ; Verhulst, Brad ; McDermott, Rose ; Nørgaard, Asbjørn Sonne ; Klofstad, Casey A. ; Christensen, Kaare ; Johannesson, Magnus ; Magnusson, Patrik K.E. ; Eaves, Lindon J. ; Martin, Nicholas G. / Genetic influences on political ideologies : Twin analyses of 19 measures of political ideologies from five democracies and genome-wide findings from three populations. In: Behavior Genetics. 2014 ; Vol. 44, No. 3. pp. 282-294.
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abstract = "Almost 40 years ago, evidence from large studies of adult twins and their relatives suggested that between 30 and 60 {\%} of the variance in social and political attitudes could be explained by genetic influences. However, these findings have not been widely accepted or incorporated into the dominant paradigms that explain the etiology of political ideology. This has been attributed in part to measurement and sample limitations, as well the relative absence of molecular genetic studies. Here we present results from original analyses of a combined sample of over 12,000 twins pairs, ascertained from nine different studies conducted in five democracies, sampled over the course of four decades. We provide evidence that genetic factors play a role in the formation of political ideology, regardless of how ideology is measured, the era, or the population sampled. The only exception is a question that explicitly uses the phrase {"}Left-Right{"}. We then present results from one of the first genome-wide association studies on political ideology using data from three samples: a 1990 Australian sample involving 6,894 individuals from 3,516 families; a 2008 Australian sample of 1,160 related individuals from 635 families and a 2010 Swedish sample involving 3,334 individuals from 2,607 families. No polymorphisms reached genome-wide significance in the meta-analysis. The combined evidence suggests that political ideology constitutes a fundamental aspect of one's genetically informed psychological disposition, but as Fisher proposed long ago, genetic influences on complex traits will be composed of thousands of markers of very small effects and it will require extremely large samples to have enough power in order to identify specific polymorphisms related to complex social traits.",
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Hatemi, PK, Medland, SE, Klemmensen, R, Oskarsson, S, Littvay, L, Dawes, CT, Verhulst, B, McDermott, R, Nørgaard, AS, Klofstad, CA, Christensen, K, Johannesson, M, Magnusson, PKE, Eaves, LJ & Martin, NG 2014, 'Genetic influences on political ideologies: Twin analyses of 19 measures of political ideologies from five democracies and genome-wide findings from three populations', Behavior Genetics, vol. 44, no. 3, pp. 282-294. https://doi.org/10.1007/s10519-014-9648-8

Genetic influences on political ideologies : Twin analyses of 19 measures of political ideologies from five democracies and genome-wide findings from three populations. / Hatemi, Peter K.; Medland, Sarah E.; Klemmensen, Robert; Oskarsson, Sven; Littvay, Levente; Dawes, Christopher T.; Verhulst, Brad; McDermott, Rose; Nørgaard, Asbjørn Sonne; Klofstad, Casey A.; Christensen, Kaare; Johannesson, Magnus; Magnusson, Patrik K.E.; Eaves, Lindon J.; Martin, Nicholas G.

In: Behavior Genetics, Vol. 44, No. 3, 01.01.2014, p. 282-294.

Research output: Contribution to journalArticle

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AU - Hatemi, Peter K.

AU - Medland, Sarah E.

AU - Klemmensen, Robert

AU - Oskarsson, Sven

AU - Littvay, Levente

AU - Dawes, Christopher T.

AU - Verhulst, Brad

AU - McDermott, Rose

AU - Nørgaard, Asbjørn Sonne

AU - Klofstad, Casey A.

AU - Christensen, Kaare

AU - Johannesson, Magnus

AU - Magnusson, Patrik K.E.

AU - Eaves, Lindon J.

AU - Martin, Nicholas G.

PY - 2014/1/1

Y1 - 2014/1/1

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