Genetic associations with intimate partner violence in a sample of hazardous drinking men in batterer intervention programs

Considering context: Current relationship satisfaction in a second-generation model of men's physical intimate partner violence

Despite a half-century of scholarship devoted to explicating and disrupting the intergenerational transmission of family violence, it remains a prominent and destructive social force in the United States. Theoretical models have posited a variety of historical and concurrent risk and protective factors implicated in the trajectory from childhood violence exposure to adult perpetration. Using a second-generation model of intimate partner violence (IPV), we integrated social learning and attachment conceptualizations to examine pathways from family-of-origin violence to IPV perpetration among adult men. A sample of mixed-sex couples (N = 233) completed self-report measures related to social learning and attachment-based factors (e.g., violence in past relationships, child exposure, IPV attitudes, adult attachment) and participated in a 10-min conversation about a desired area for change in their relationship. Following, each partner participated in a video-mediated-recall procedure assessing their anger volatility and eliciting attributions of their partners' behavior. We tested mediation pathways (consistent with social learning and attachment theories) between violence in men's families of origin and their adult IPV perpetration as a function of relationship satisfaction. The proposed model fit the data well (CFI = 0.95) but had notable modifications from the hypothesized model. Generally, social-learning pathways were more consistent with the data. Relationship satisfaction interacted with some parameters. Results support theoretical advances in understanding IPV. Although exposure to violence in men's family of origin confers risk for later IPV, and a social learning developmental pathway is consistent with results, some of these effects are altered by relationship context.

Examination of the Transient Changes in Affect Resulting From Participation in Research Addressing Intimate Partner Violence

As a result of the proliferation of data examining intimate partner violence (IPV), there has been an emerging interest in how this research emotionally affects participants, particularly those with a history of personal experience with IPV. While a large body of IPV research suggests that only a small proportion of individuals experience transient emotional distress as the result of participation, this research is limited by examining only the emotional responses at the conclusion of the research, rather than examining changes in affect during the research. Therefore, this research sought to examine negative affect among participants throughout the research to better examine the trajectory of affect during participation in research on IPV. We recruited a sample of 914 college students who completed a measure of negative affect at the beginning, after being exposed to violence questionnaires, and at the conclusion of the research. The findings suggested that among the total sample, negative affect generally declined over the course of the research, although there was a significant interaction for victims of both psychological and physical IPV, such that their negative affect remained stable over participation in the research. Negative affect was significantly correlated with measures of reactions to the research globally, and not significantly related to perceptions of the overall benefits of the research. These data suggest that participation in research on IPV does not increase negative affect, even among those with a history of IPV. Implications of these data for future research on IPV are discussed.

The Interaction of Dopamine Genes and Financial Stressors to Predict Adulthood Intimate Partner Violence Perpetration

Three dopamine genes (DAT1, DRD2, and DRD4) have been associated with interpersonal delinquency, aggression, and violence when individuals experience adverse environmental exposures. Guided by the catalyst model of aggression, risk alleles identified in previous studies were hypothesized to be associated with intimate partner violence (IPV) perpetration in the presence of financial stressors, a possible environmental trigger. This hypothesis was tested using weighted, clustered logistic regression with data from the National Longitudinal Study of Adolescent to Adult Health. The direct effects DAT1, DRD2, and DRD4 on IPV perpetration, and the interaction of DAT1, DRD2, and DRD4 and financial stressors on IPV perpetration were assessed. Due to cell size, only White men and women were included in this analysis. Increasing number of financial stressors was associated with increased odds of IPV perpetration, regardless of DAT1, DRD2, and DRD4 alleles. As predicted, increasing number of financial stressors was more strongly associated with IPV perpetration among individuals with high-risk DAT1 alleles, than individuals with low-risk alleles. However, this relationship was inverted for DRD2. Although there was still a significant interaction between DRD2 and financial stressors, individuals with low-risk alleles had higher odds of IPV perpetration in the presence of financial stressors. A similar, nonsignificant relationship was found for DRD4. These findings indicate that these genes may interact differently with environmental exposures and types of violent behavior. In addition, the findings may, if replicated, suggest dopamine plays a different role in IPV perpetration compared with other forms of aggression and violence.

Antisocial Traits, Distress Tolerance, and Alcohol Problems as Predictors of Intimate Partner Violence in Men Arrested for Domestic Violence

OBJECTIVE

Men with antisocial personality disorder (ASPD) traits are at an increased risk for consuming alcohol and perpetrating intimate partner violence (IPV). However, previous research has neglected malleable mechanisms potentially responsible for the link between ASPD traits, alcohol problems, and IPV perpetration. Efforts to improve the efficacy of batterer intervention programs (BIPs) would benefit from exploration of such malleable mechanisms. The present study is the first to examine distress tolerance as one such mechanism linking men's ASPD traits to their alcohol problems and IPV perpetration.

METHODS

Using a cross-sectional sample of 331 men arrested for domestic violence and court-referred to BIPs, the present study used structural equation modeling to examine pathways from men's ASPD traits to IPV perpetration directly and indirectly through distress tolerance and alcohol problems.

RESULTS

Results supported a two-chain partial mediational model. ASPD traits were related to psychological aggression perpetration directly and indirectly via distress tolerance and alcohol problems. A second pathway emerged by which ASPD traits related to higher levels of alcohol problems, which related to psychological aggression perpetration. Controlling for psychological aggression perpetration, neither distress tolerance nor alcohol problems explained the relation between ASPD traits and physical assault perpetration.

CONCLUSION

These results support and extend existing conceptual models of IPV perpetration. Findings suggest intervention efforts for IPV should target both distress tolerance and alcohol problems.

Alcohol Intoxication Moderates the Association between a Polygenic Risk Score and Unprovoked Intimate Partner Aggression

Despite evidence that genetic variation contributes to aggression, few studies have examined how genetic variation contributes to IPA specifically. In the current study, 69 couples from a Midwestern university completed self-report measures of IPA, childhood trauma exposure, and hazardous alcohol use, and were randomly assigned to consume either a placebo or alcohol beverage before participating in an analogue aggression task against their partner. Genetic risk (i.e., association with lower transcriptional efficiency) for aggression was measured with a polygenic risk score (PRS) created from four polymorphisms (HTR1B rs13212041, HTR2B rs6437000, 5-HTTLPR, and MAOA uVNTR). Among individuals with a low PRS, individuals who consumed alcohol (BrAC = 0.07%) showed greater unprovoked IPA than individuals who consumed a placebo. Findings contribute to our limited understanding regarding the etiology of IPA and suggest that individuals who have increased transcriptional activity in certain serotonin system genes may be at higher risk of IPA when intoxicated.

Interactions of adolescent social experiences and dopamine genes to predict physical intimate partner violence perpetration

Objectives

We examined the interactions between three dopamine gene alleles (DAT1, DRD2, DRD4) previously associated with violent behavior and two components of the adolescent environment (exposure to violence, school social environment) to predict adulthood physical intimate partner violence (IPV) perpetration among white men and women.

Methods

We used data from Wave IV of the National Longitudinal Study of Adolescent to Adult Health, a cohort study following individuals from adolescence to adulthood. Based on the prior literature, we categorized participants as at risk for each of the three dopamine genes using this coding scheme: two 10-R alleles for DAT1; at least one A-1 allele for DRD2; at least one 7-R or 8-R allele for DRD4. Adolescent exposure to violence and school social environment was measured in 1994 and 1995 when participants were in high school or middle school. Intimate partner violence perpetration was measured in 2008 when participants were 24 to 32 years old. We used simple and multivariable logistic regression models, including interactions of genes and the adolescent environments for the analysis.

Results

Presence of risk alleles was not independently associated with IPV perpetration but increasing exposure to violence and disconnection from the school social environment was associated with physical IPV perpetration. The effects of these adolescent experiences on physical IPV perpetration varied by dopamine risk allele status. Among individuals with non-risk dopamine alleles, increased exposure to violence during adolescence and perception of disconnection from the school environment were significantly associated with increased odds of physical IPV perpetration, but individuals with high risk alleles, overall, did not experience the same increase.

Conclusion

Our results suggested the effects of adolescent environment on adulthood physical IPV perpetration varied by genetic factors. This analysis did not find a direct link between risk alleles and violence, but contributes to growing research indicating that if genetic factors contribute to perpetration, this relationship is likely complicated and the result of interactions with other factors.

Gene-Gene-Environment Interactions of Serotonin Transporter, Monoamine Oxidase A and Childhood Maltreatment Predict Aggressive Behavior in Chinese Adolescents

Gene-environment interactions that moderate aggressive behavior have been identified independently in the serotonin transporter (5-HTT) gene and monoamine oxidase A gene (MAOA). The aim of the present study was to investigate epistasis interactions between MAOA-variable number tandem repeat (VNTR), 5-HTTlinked polymorphism (LPR) and child abuse and the effects of these on aggressive tendencies in a group of otherwise healthy adolescents. A group of 546 Chinese male adolescents completed the Child Trauma Questionnaire and Youth self-report of the Child Behavior Checklist. Buccal cells were collected for DNA analysis. The effects of childhood abuse, MAOA-VNTR, 5-HTTLPR genotypes and their interactive gene-gene-environmental effects on aggressive behavior were analyzed using a linear regression model. The effect of child maltreatment was significant, and a three-way interaction among MAOA-VNTR, 5-HTTLPR and sexual abuse (SA) relating to aggressive behaviors was identified. Chinese male adolescents with high expression of the MAOA-VNTR allele and 5-HTTLPR “SS” genotype exhibited the highest aggression tendencies with an increase in SA during childhood. The findings reported support aggression being a complex behavior involving the synergistic effects of gene-gene-environment interactions.

Intimate Partner Violence and Traumatic Brain Injury: State of the Science and Next Steps

Women who receive traumatic brain injuries (TBI) from intimate partner violence (IPV) are gaining attention; however, research studies are lacking in this area. A review of literature conducted on TBI from IPV found prevalence of 60% to 92% of abused women obtaining a TBI directly correlated with IPV. Adverse overlapping health outcomes are associated with both TBI and IPV. Genetic predisposition and epigenetic changes can occur after TBI and add increased vulnerability to receiving and inflicting a TBI. Health care providers and community health workers need awareness of the link between IPV/TBI to provide appropriate treatment and improve the health of women and families.

Genetics moderate alcohol and intimate partner violence treatment outcomes in a randomized controlled trial of hazardous drinking men in batterer intervention programs: A preliminary investigation

OBJECTIVE

We examined whether a cumulative genetic score (CGS) containing MAOA and 5-HTTLPR polymorphisms moderated drinking and intimate partner violence (IPV) treatment outcomes in hazardous drinking men receiving batterer intervention or batterer intervention plus a brief alcohol intervention.

METHOD

We conducted a randomized controlled trial with 97 hazardous drinking men who had a relationship partner and were in batterer intervention programs. Participants were randomized to receive 40 hr of standard batterer program (SBP) or the SBP plus a 90-min alcohol intervention (SBP + BAI). Data were collected at baseline, 3-, 6-, and 12-month follow-up, with follow-up rates of 99.0%, 97.9%, and 93.8%, respectively. Genomic DNA was extracted from saliva. Substance use was measured with the timeline followback interview; IPV was assessed with the Revised Conflict Tactics scales. The primary outcomes were drinks per drinking day (DDD), percentage of days abstinent from alcohol (PDA), frequency of physical IPV, and injuries to partners.

RESULTS

Consistent with hypotheses, analyses demonstrated significant treatment condition by CGS interactions for PDA, physical violence, and injuries, but not for DDD. At high levels of the CGS, men in SBP + BAI had greater PDA (B = .16, 95% CI [.04, .27], p = .01), less physical violence perpetration (B = -1.21, 95% CI [-2.21, -.21], p = .02), and fewer injuries to partners (B = -2.37, 95% CI [-3.19, -.82], p = .00) than men in SBP. No differences between the groups in PDA, physical violence, or injuries were observed at low levels of the CGS.

CONCLUSIONS

Findings demonstrate the potential importance of MAOA and 5-HTTLPR polymorphisms in the treatment of IPV and drinking in men in batterer intervention programs. (PsycINFO Database Record

Comments on Stuart et al.'s "Genetic associations with intimate partner violence in a sample of hazardous drinking men in batterer intervention programs"

Stuart et al. correlate genetic characteristics of men in batterer intervention programs with their level of intimate partner violence (IPV). In this commentary, I address the generality of the results in light of the characteristics of the participants, speculate about possible effects of current and future genetic and biological research on potential consumers of such research, and place this research in the context on an ongoing criticism of batterer intervention programs by various constituents.

Responsible integration of biological and psychosocial models: comments on "Genetic associations with intimate partner violence in a sample of hazardous drinking men in batterer intervention programs"

Despite research demonstrating that gene expression differs in response to social environmental circumstances, deterministic views of biology are common. Stuart and colleagues (2014) encourage readers to think about genetic factors in the same dynamic and probabilistic manner that they consider other causes of intimate partner violence. Given that participants had co-occurring alcohol problems, future studies should evaluate how different genetic polymorphisms uniquely and synergistically contribute to heavy drinking and aggression under different socio-environmental conditions. Psychological expectancies have a powerful impact on behavior, thus extreme caution is required before labeling people as genetically predisposed to violence.

Further investigation of genetics and intimate partner violence

We thank Drs. Abbey, Bennett, DeWall, and Way for making truly outstanding points in their thoughtful commentaries. We agree with the feedback and advice from all of these distinguished scientists. Future work on genetics and intimate partner violence (IPV) should, when possible, include a larger number of genetic variants, closely examine gene by environment interactions, and study potential mechanisms explaining the connection between genetics and IPV. As with any research, but particularly with respect to studies on a controversial topic such as genetic correlates of IPV, extreme caution should be taken prior to generalizing results or deriving any practical applications from the data. Clearly, replication and extension of the findings in other populations is essential. Ultimately, we believe that it is worth pursuing this line of work given the possible contributions it may make to understanding the etiology, prevention, and treatment of IPV in the future. Finding solutions to IPV will require the collaboration of a diverse group of constituents from many disciplines.

A new piece to understanding the intimate partner violence puzzle: what role do genetics play?

Numerous factors prompt intimate partner violence (IPV). Stuart and colleagues examined whether variations in two theoretically relevant genetic variants predispose some people toward perpetrating psychological aggression, physical aggression, and violence that causes the victim serious physical injury. This commentary discusses the importance of considering how the observed genetic risk factors for IPV may be best understood within the context of their interaction with environmental risk factors. By focusing on gene-environment interactions, future work may help identify not only who is at risk for IPV perpetration but also who may be buffered from it.