Methylation at 5HTT mediates the impact of child sex abuse on women's antisocial behavior: an examination of the Iowa adoptee sample.
OBJECTIVE
To examine epigenetic processes linking childhood sex abuse to symptoms of antisocial personality disorder (ASPD) in adulthood and to investigate the possibility that the link between childhood sex abuse and deoxyribonucleic acid methylation at the 5HTT promoter might represent a pathway of long-term impact on symptoms of ASPD.


METHODS
Deoxyribonucleic acid was prepared from lymphoblast cell lines derived from 155 female participants in the latest wave of the Iowa Adoptee Study. Methylation at 71 CpG residues was determined by quantitative mass spectroscopy, and the resulting values were averaged to produce an average CpG ratio for each participant. Simple associations and path analyses within an Mplus framework were examined to characterize the relationships among childhood sex abuse, overall level of methylation among women, and subsequent antisocial behavior in adulthood. Direct effects of biological parent psychopathology and 5HTT genotype were controlled.


RESULTS
Replicating prior work, we found that a significant effect of childhood sex abuse on methylation of the 5HTT promoter region emerged for women. In addition, a significant effect of methylation at 5HTT on symptoms of ASPD emerged.


CONCLUSIONS
Child sex abuse may create long-lasting changes in methylation of the promoter region of 5HTT in women. Furthermore, hypermethylation may be one mechanism linking childhood sex abuse to changes in risk for adult antisocial behavior in women. Better understanding of the methylome may prove critical in understanding the role of childhood environments on long-term psychiatric sequelae.
Institute for Behavioral Research, University of Georgia, 510 Boyd GSRC, Athens, GA 30602, USA. srhbeach@uga.edu
Steven R H
SR
Beach
Gene H
GH
Brody
Alexandre A
AA
Todorov
Tracy D
TD
Gunter
Robert A
RA
Philibert
D000300:Adoption / Q000523:psychology*; D000328:Adult; D054523:Adult Survivors of Child Abuse / Q000523:psychology / Q000706:statistics & numerical data*; D000987:Antisocial Personality Disorder / Q000235:genetics*; D001483:Base Sequence; D002648:Child; D002650:Child Abuse, Sexual / Q000523:psychology / Q000706:statistics & numerical data*; D003596:Cytosine / Q000378:metabolism; D019175:DNA Methylation / Q000235:genetics* / Q000502:physiology; D015536:Down-Regulation / Q000235:genetics; D044127:Epigenesis, Genetic / Q000235:genetics / Q000502:physiology; D005260:Female; D006147:Guanine / Q000378:metabolism; D006801:Humans; D008745:Methylation; D011401:Promoter Regions, Genetic / Q000235:genetics / Q000502:physiology; D050486:Serotonin Plasma Membrane Transport Proteins / Q000235:genetics*
C493230:SLC6A4 protein, human; D050486:Serotonin Plasma Membrane Transport Proteins; D006147:Guanine; D003596:Cytosine