A contemporary view of genes and behavior: complex systems and interactions

Area of Science:

• Behavioral Genetics
• Molecular Genetics
• Human Trait Research

Background:

• Extensive research has not identified specific genes influencing complex human traits within the normal range.
• Previous claims of genetic influence on traits like intelligence and personality are now considered false positives.

Purpose of the Study:

• To re-evaluate the current understanding of genetic influences on human behavior.
• To highlight the progress in molecular genetics and its implications for behavioral genetics.
• To propose a reform in genetics education and research funding priorities.

Main Methods:

• Review of large-scale genetic searches for complex human traits.
• Analysis of findings related to genes influencing psychiatric disorders.
• Synthesis of current molecular genetics principles regarding gene networks and environmental context.

Main Results:

• No significant genes identified for normal variations in complex human traits; prior claims were false positives.
• Rare mutations in specific genes are linked to severe disorders (e.g., autism, schizophrenia), often as de novo mutations.
• Established principles demonstrate gene networks interacting within environmental contexts, challenging statistical genetic assumptions.

Conclusions:

• Current methods for finding genes for normal behavioral variation are unproductive and should be re-evaluated.
• The focus should shift towards understanding gene-environment interactions and network effects.
• Genetics education and research funding need reform to reflect current scientific understanding and priorities.