The Epigenesis of Planum Temporale Asymmetry in Twins

Overview

Journal Cereb Cortex

Publisher Oxford University Press

Specialty Neurology

Date 2002 Jun 7

PMID 12050086

Citations 17

Authors

Mark A Eckert

Christiana M Leonard

Elizabeth A Molloy

Jonathan Blumenthal

Alex Zijdenbos

Jay N Giedd

Affiliations

Soon will be listed here.

Abstract

Variation in hemispheric asymmetry of the planum temporale (PT) has been related to verbal ability. The degree to which genetic and environmental factors mediate PT asymmetry is not known. This study examined the heritability for planar asymmetry in 12 dizygotic (DZ) and 27 monozygotic (MZ) male twin pairs who were between 6 and 16 years of age. There was weak but positive evidence for heritability of planar asymmetry. Co-twin similarity for planar asymmetry and Sylvian fissure morphology increased when excluding twins discordant for writing hand and when excluding twins exhibiting birth weight differences >20% from the analyses. Birth weight differences were also related to twin differences in total cerebral volume, but not central sulcus asymmetry. These results suggest that exogenous perinatal factors affect the epigenesis of planar asymmetry development.

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