Building an Asymmetrical Brain: The Molecular Perspective

Frontiers in Psychology

article

Judith Schmitz¹  Sebastian Ocklenburg¹ 

[1] Department of Psychology, Institute of Cognitive Neuroscience, Ruhr University Bochum

关键词: laterality;    handedness;    language lateralization;    epigenetics;    Nodal pathway;   

DOI  :  10.3389/fpsyg.2019.00982

学科分类：社会科学、人文和艺术（综合）

来源: Frontiers

【 摘 要 】

The brain is one of the most prominent examples for structural and functional differences between the left and right half of the body. For handedness and language lateralization, the most widely investigated behavioral phenotypes, only a small fraction of phenotypic variance has been explained by molecular genetic studies. Due to environmental factors presumably also playing a role in their ontogenesis and based on first molecular evidence, it has been suggested that functional hemispheric asymmetries are partly under epigenetic control. This review article aims to elucidate the molecular factors underlying hemispheric asymmetries and their association with inner organ asymmetries. While we previously suggested that epigenetic mechanisms might partly account for the missing heritability of handedness, this article extends this idea by suggesting possible alternatives for transgenerational transmission of epigenetic states that do not require germ line epigenetic transmission. This is in line with a multifactorial model of hemispheric asymmetries, integrating genetic, environmental, and epigenetic influencing factors in their ontogenesis.

【 授权许可】

CC BY