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12 - Behavioral and Molecular Genetics

from Part III - Experimental and Biological Approaches

Published online by Cambridge University Press:  23 March 2020

By
Gretchen Saunders  and
Matt McGue
Edited by
Aidan G. C. Wright  and
Michael N. Hallquist
Aidan G. C. Wright
Affiliation:
University of Pittsburgh
Michael N. Hallquist
Affiliation:
Pennsylvania State University
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Summary

Behavioral genetic research unequivocally supports the influence of both genetic and environmental factors on psychopathology risk. Decomposition of the sources of these influences has largely been carried out using twin and adoption studies. Building off the results of these studies, molecular genetic methodologies have come to dominate the field with the goal of identifying genetic variants that causally influence psychopathology risk. The chapter summarizes the logic of both quantitative and molecular genetic methods as well as their major findings as related to clinical psychology. Traditional and modern methods for estimating heritability based on familial relationships are described. From there the challenge of finding causal genetic variants in the context of polygenic phenotypes, including psychopathology, emerges. The chapter concludes by discussing the interaction between genes and the environment as well as future directions in the field, including rare variant analysis and epigenetics. An emphasis is placed on interpretation of results and limitations of past and current methodologies. Behavioral genetic research has produced strong results regarding the importance of genetic factors on psychopathology while also highlighting the influence of the environment. Uncovering the causal sources of these effects remains a young but active area of research.

Keywords

behavior geneticspsychopathologytwinadoptiongenome-wide association studiesmolecular genetics
Type
Chapter
Information
The Cambridge Handbook of Research Methods in Clinical Psychology , pp. 136 - 152
Publisher: Cambridge University Press
Print publication year: 2020

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To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

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