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Genetic correlations among texture characteristics in the human iris
Örebro universitet, Institutionen för beteende-, social- och rättsvetenskap.
2004 (engelsk)Inngår i: Molecular Vision, ISSN 1090-0535, E-ISSN 1090-0535, Vol. 10, s. 821-831Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

PURPOSE:

To estimate the magnitude of genetic correlations among five general textural characteristics of the human iris.

METHODS:

Color photographs of iris were available from 100 monozygotic and 99 dizygotic twin pairs. Comparative scales were constructed based on ratings of the subjects' left iris. To explore the genetic and environmental covariation among frequency of Fuchs' crypts, frequency of pigment dots, iris color, the extension, and distinction of Wolfflin nodules, and contraction furrows, a structural equation model with Cholesky decomposition was applied to variance-covariance matrices for monozygotic (MZ) and dizygotic (DZ) pairs.

RESULTS:

Significant genetic correlations fell between -0.22 and 0.44 and accounted almost entirely for the phenotypic correlations among the iris characteristics. No evidence for individual specific environmental effects in common to the characteristics was found.

CONCLUSIONS:

The modest genetic correlations indicate that there is little overlap in the genetic influence for these characteristics. Candidate genes with embryological and histological expression patterns in the eye could potentially influence the iris characteristics' variability.

sted, utgiver, år, opplag, sider
2004. Vol. 10, s. 821-831
HSV kategori
Forskningsprogram
Psykologi
Identifikatorer
URN: urn:nbn:se:oru:diva-2857OAI: oai:DiVA.org:oru-2857DiVA, id: diva2:135315
Tilgjengelig fra: 2007-11-23 Laget: 2007-11-23 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Human iris characteristics as biomarkers for personality
Åpne denne publikasjonen i ny fane eller vindu >>Human iris characteristics as biomarkers for personality
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This dissertation explains why behavioral genetic research can be better informed by using characteristics in the human iris as biomarkers for personality, and is divided into five parts. Part I gives an introduction to the classical twin method and an overview of the findings that have led most developmental researchers to recognize that the normal variation of personality depends on a complex interplay between genetic and environmental factors. Part II highlights empirical findings that during the last twenty years have gradually moved genetic and environmental theory and research to evolve toward one another, and also presents the theory of genetics and experience that currently is used to explain how the interplay between genes and the environment works. Part III explains why, from a developmental perspective, it is of interest to identify candidate genes for personality, and gives a brief overview of genes that have been associated with personality. Problems associated with genetic research on the molecular level and how these apply to personality are also highlighted. Part IV examines molecular research on the iris and the brain, which suggests that genes expressed in the iris could be associated with personality, and explains how the use of iris characteristics can increase power to test candidate genes for personality by taking advantage of the self-organizing properties of the nervous system. The empirical foundation for the questions posed in this dissertation and also the empirical results are presented here. Part V discusses the associations found between iris characteristics and personality, and exemplifies how iris characteristics can be used within the theoretical frameworks presented in parts I, II, III and IV. In other words, Part V explains how iris characteristics – in addition to identify as well as test candidate genes for personality – can be used to investigate how people’s experiences in themselves are influenced by genetic factors.

sted, utgiver, år, opplag, sider
Örebro: Örebro universitet, 2007. s. 128
Serie
Örebro Studies in Psychology, ISSN 1651-1328 ; 12
Emneord
Personality, iris characteristics/crypts/pigment dots/contraction furrows, candidate genes MITF/PAX6/SIX3/LMX1B/FOXC1/FOXC2/PITX2/BMP4/OLFM3/ MSX1/MSX2, anterior cingulate, genetic correlations, heritability, hemispheric asymmetries, approach-related behaviors
HSV kategori
Forskningsprogram
Psykologi
Identifikatorer
urn:nbn:se:oru:diva-1684 (URN)978-91-7668-562-4 (ISBN)
Disputas
2007-12-14, Hörsal L 3, Långhuset, Örebro universitet, Örebro, 13:00
Opponent
Veileder
Tilgjengelig fra: 2007-11-23 Laget: 2007-11-23 Sist oppdatert: 2017-10-18bibliografisk kontrollert

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http://www.molvis.org/molvis/v10/a98/

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