A Prospective Cohort Study of Influences on Externalizing Behaviors Across Childhood: Results From a Nurse Home Visiting Randomized Controlled Trial

Parenting in the Context of the Child: Genetic and Social Processes

The focus on the role of parenting in child development has a long-standing history. When measures of parenting precede changes in child development, researchers typically infer a causal role of parenting practices and attitudes on child development. However, this research is usually conducted with parents raising their own biological offspring. Such research designs cannot account for the effects of genes that are common to parents and children, nor for genetically influenced traits in children that influence how they are parented and how parenting affects them. The aim of this monograph is to provide a clearer view of parenting by synthesizing findings from the Early Growth and Development Study (EGDS). EGDS is a longitudinal study of adopted children, their birth parents, and their rearing parents studied across infancy and childhood. Families (N = 561) were recruited in the United States through adoption agencies between 2000 and 2010. Data collection began when adoptees were 9 months old (males = 57.2%; White 54.5%, Black 13.2%, Hispanic/Latinx 13.4%, Multiracial 17.8%, other 1.1%). The median child age at adoption placement was 2 days (M = 5.58, SD = 11.32). Adoptive parents were predominantly in their 30s, White, and coming from upper-middle- or upper-class backgrounds with high educational attainment (a mode at 4-year college or graduate degree). Most adoptive parents were heterosexual couples, and were married at the beginning of the project. The birth parent sample was more racially and ethnically diverse, but the majority (70%) were White. At the beginning of the study, most birth mothers and fathers were in their 20s, with a mode of educational attainment at high school degree, and few of them were married. We have been following these family members over time, assessing their genetic influences, prenatal environment, rearing environment, and child development. Controlling for effects of genes common to parents and children, we confirmed some previously reported associations between parenting, parent psychopathology, and marital adjustment in relation to child problematic and prosocial behavior. We also observed effects of children's heritable characteristics, characteristics thought to be transmitted from parent to child by genetic means, on their parents and how those effects contributed to subsequent child development. For example, we found that genetically influenced child impulsivity and social withdrawal both elicited harsh parenting, whereas a genetically influenced sunny disposition elicited parental warmth. We found numerous instances of children's genetically influenced characteristics that enhanced positive parental influences on child development or that protected them from harsh parenting. Integrating our findings, we propose a new, genetically informed process model of parenting. We posit that parents implicitly or explicitly detect genetically influenced liabilities and assets in their children. We also suggest future research into factors such as marital adjustment, that favor parents responding with appropriate protection or enhancement. Our findings illustrate a productive use of genetic information in prevention research: helping parents respond effectively to a profile of child strengths and challenges rather than using genetic information simply to identify some children unresponsive to current preventive interventions.

Serotonin system genes contribute to the susceptibility to obesity in Black adolescents

OBJECTIVE

The importance of the central and peripheral serotonin systems in regulating energy balance and obesity development has been highlighted in animal models. Yet, the role of both serotonin systems has not been systematically assessed in humans. The purpose of this study was to investigate the association of genes within both serotonin systems with obesity outcomes in black adolescents.

METHODS

African-American adolescents (n = 1052) whose mothers participated the Memphis New Mother's Study were assessed. In total, 110 polymorphisms mapped to 10 serotonin genes were examined for their associations with standardized body mass index (BMI-z) scores and waist circumferences using generalized estimating equation models.

RESULTS

Over 39% of adolescents were overweight or had obesity. Three single nucleotide polymorphisms (SNPs) within TPH2, HTR3B, and SLC6A4, were significantly associated with BMI-z scores (p < 1.7 × 10-3). Two SNPs in TPH2 were nominally associated with waist circumferences. One SNP in HTR2C was associated with BMI-z scores (p = 0.001) and waist circumferences (p = 0.005) only in girls. Tissue-specific expression indicates that three identified genes are predominantly expressed in the brain.

CONCLUSION

The central serotonin system may play a key role in obesity development in black adolescents. Future studies are warranted to explore additional serotonin system genes and their potential obesogenic mechanisms in humans.

Alcohol use disorders among adult children of alcoholics (ACOAs): Gene-environment resilience factors

Both genetic and early environmental factors contribute to the pathogenesis of Alcohol Use Disorder (AUD). Gender and psychopathology symptoms might further moderate this association, resulting in an impairment of both the dopaminergic and serotoninergic pathways that sustain the binge, withdrawal and craving cycle. In a sample of of adult children of alcoholic parents (ACOAs) (n = 107) we compared those with and without an AUD, on socio-demographic variables, adverse childhood experiences, psychopathology symptoms and two polymorphisms associated with an impaired serotoninergic and dopaminergic neurotransmission (5HTTLPR and Taq1A/DRD2). A logistic regression revealed that an early caring environment might lower the risk of developing an AUD. When controlling for the actual psychopathology symptoms, being male and having the genotype associated with an impaired dopaminergic neurotransmission were still associated with AUD. Results were confirmed by an unsupervised approach that showed how the clusters characterised by being male and having the high risk genotypes were still associated with AUD compared to being female without the unfavourable dopamine genotype.Our results point to the need for implementing prevention strategies aimed at creating a caring environment especially in those families with an alcoholic parent. We further suggest that psycho-education as a symptom recognition and avoiding self-medication could improve the outcome in those subjects at higher risk, especially males.

Look to Norway: Serving new families and infants in a multiethnic population

Despite recognition that immigrant women face significant health challenges, addressing the healthcare needs of immigrants is a source of debate in the United States. Lack of adequate healthcare for immigrants is recognized as a social justice issue, and other countries have incorporated immigrants into their healthcare services. Oslo, the fastest growing capital in Europe, is rapidly shifting to a heterogeneous society prompting organizational action and change. The New Families Program serves first-time mothers and their infants in an Oslo district serving 53% minorities from 142 countries. Anchored in salutogenic theory, the program aims to support the parent-child relationship, children's development and social adaptation, and to prevent stress-related outcomes. Formative research has informed the successful program development and implementation within the existing maternal and child healthcare service. Implications for addressing maternal and child health needs of an immigrant population are presented.

Development of Aggression Subtypes from Childhood to Adolescence: a Group-Based Multi-Trajectory Modelling Perspective

The persistence of elevated subtypes of aggression beginning in childhood have been associated with long-term maladaptive outcomes. Yet it remains unclear to what extent there are clusters of individuals following similar developmental trajectories across forms (i.e., physical and indirect) and functions (i.e., proactive and reactive) of aggression. We aimed to identify groups of children with distinct profiles of the joint development of forms and functions of aggression and to identify risk factors for group membership. A sample of 787 children was followed from birth to adolescence. Parent and teacher reports, and standardised assessments were used to measure two forms and two functions of aggressive behaviour, between six and 13 years of age along with preceding child, maternal, and family-level risk-factors. Analyses were conducted using a group-based multi-trajectory modelling approach. Five trajectory groups emerged: non-aggressors, low-stable, moderate-engagers, high-desisting, and high-chronic. Coercive parenting increased membership risk in the moderate-engagers and high-chronic groups. Lower maternal IQ increased membership risk in both high-desisting and high-chronic groups, whereas maternal depression increased membership risk in the high-desisting group only. Never being breastfed increased membership risk in the moderate-engagers group. Boys were at greater risk for belonging to groups displaying elevated aggression. Individuals with chronic aggression problems use all subtypes of aggression. Risk factors suggest that prevention programs should start early in life and target mothers with lower IQ. Strategies to deal with maternal depression and enhance positive parenting while replacing coercive parenting tactics should be highlighted in programming efforts.

Formative research in the development of a salutogenic early intervention home visiting program integrated in public child health service in a multiethnic population in Norway

BACKGROUND

Few early intervention programs aimed at maternal and child health have been developed to be integrated in the existing Child Health Service in a country where the service is free, voluntary and used by the majority of the eligible population. This study presents the process and the critical steps in developing the "New Mothers" program.

METHODS

Formative research uses a mixed method, allowing us to obtain data from multiple sources. A scoping review provided information on early intervention programs and studies, clarifying key elements when framing a new program. Key informant and focus group interviews offered insight of existing challenges, perceptions, identified power structures and offered reflections germane to the identified framework, securing user involvement at all stages. Monthly meetings with the project group enabled feedback loops for the data, securing program advancement.

RESULTS

The "New Mothers" program was formed based on a salutogenic theory, emphasizing resistance and strengths. Public health nurses in the existing Child Health Service were to offer universally all first-time mothers and children home visits from gestational week 28 until the child reached 2 years, with motivational interviewing and empathic communication as methods to mentor the mothers, help them identify their strengths and resources, and provide support and information.

CONCLUSIONS

Using formative research as mixed method ensures incorporation of detailed information from multiple resources when an early intervention program is developed. This method secured program appropriateness, both culturally and at system level, when integrating new elements in the existing service.

Association Between Changes in Caregiver Depressive Symptoms and Child Attention-Deficit/Hyperactivity Disorder Symptoms

OBJECTIVE

Depression is highly prevalent among caregivers of children with attention-deficit/hyperactivity disorder (ADHD). We examined the association between caregiver depressive symptom trajectories and changes in child ADHD symptoms.

METHODS

We analyzed data from a randomized trial of 2 ADHD care management systems for children aged 6 to 12 years and their caregivers (n = 156 dyads). Child ADHD symptoms were measured using the Swanson, Nolan, and Pelham rating scale (SNAP-IV). Caregiver depressive symptoms were measured using the Quick Inventory of Depressive Symptomatology (QIDS). Measures were assessed at baseline, 6 months, and 12 months. We used multivariable models to examine associations between changes in caregiver depressive symptoms and changes in child ADHD symptoms.

RESULTS

From baseline to 12 months, children of caregivers with improved depressive symptoms had significantly greater reductions in SNAP-IV scores (change score: -1.43) compared with those whose depressive symptoms did not change (change score: -0.97) or worsened (change score: -0.23, p = 0.003). In adjusted models, improved caregiver depressive symptoms were associated with greater reductions in SNAP-IV scores over the 12-month period. Compared with those with worsening caregiver depressive symptoms, children whose caregivers showed no significant changes in depressive symptoms had a -0.78 point (95% confidence interval [CI]: -1.40 to -0.17) greater reduction in the SNAP-IV score, and those children whose caregiver depressive symptoms improved had a -1.31 point greater reduction in the SNAP-IV score (95% CI: -1.97 to -0.66).

CONCLUSION

Given the longitudinal association between caregiver depressive symptom and child ADHD symptom trajectories, interventions that address the behavioral health needs of the family unit may offer promise for urban children with ADHD.

Cumulative prenatal exposure to adversity reveals associations with a broad range of neurodevelopmental outcomes that are moderated by a novel, biologically informed polygenetic score based on the serotonin transporter solute carrier family C6, member 4 (SLC6A4) gene expression

While many studies focus on the association between early life adversity and the later risk for psychopathology, few simultaneously explore diverse forms of environmental adversity. Moreover, those studies that examined the cumulative impact of early life adversity focus uniquely on postnatal influences. The objective of this study was to focus on the fetal period of development to construct and validate a cumulative prenatal adversity score in relation to a wide range of neurodevelopmental outcomes. We also examined the interaction of this adversity score with a biologically informed genetic score based on the serotonin transporter gene. Prenatal adversities were computed in two community birth cohorts using information on health during pregnancy, birth weight, gestational age, income, domestic violence/sexual abuse, marital strain, as well as maternal smoking, anxiety, and depression. A genetic score based on genes coexpressed with the serotonin transporter in the amygdala, hippocampus, and prefrontal cortex during prenatal life was constructed with an emphasis on functionally relevant single nucleotide polymorphisms, that is, expression quantitative trait loci. Prenatal adversities predicted a wide range of developmental and behavioral alterations in children as young as 2 years of age in both cohorts. There were interactions between the genetic score and adversities for several domains of the Child Behavior Checklist (CBCL), with pervasive developmental problems remaining significant adjustment for multiple comparisons. Scores combining different prenatal adverse exposures predict childhood behavior and interact with the genetic background to influence the risk for psychopathology.

Maternal Interpersonal Trauma and Child Social-Emotional Development: An Intergenerational Effect

BACKGROUND

Evidence suggests that maternal interpersonal trauma can adversely affect offspring health, but little is known about potential transmission pathways. We investigated whether interpersonal trauma exposure had direct and indirect associations with offspring social-emotional development at 12-months of age in an at-risk, home visited population.

METHODS

A retrospective cohort study was conducted of 1172 mother-child dyads who participated in a multi-site, early childhood home visiting program. Children were born January 2007 to June 2010 and data were collected at enrolment (prenatal/birth) through 12-months of age. Multivariable path analyses were used to examine the relationship between maternal interpersonal trauma, subsequent psychosocial mediators (maternal depressive symptoms, social support, and home environment), and the outcome of child social-emotional development measured with the Ages and Stages Questionnaire: Social-Emotional (ASQ:SE). Maternal interpersonal trauma was characterized as any previous exposure, the level of exposure, and type (e.g. abuse) of exposure.

RESULTS

The prevalence of maternal interpersonal trauma exposure was 69.1%, and exposures ranged from 1 type (19.3%) to 7 types (2.3%). Interpersonal trauma was associated with a 3.6 point (95% confidence interval 1.8, 5.4) higher ASQ:SE score among offspring and indicated greater developmental risk. An estimated 23.4% of the total effect was mediated by increased maternal depressive symptoms and lower social support. Differential effects were observed by the level and type of interpersonal trauma exposure.

CONCLUSION

Maternal interpersonal trauma exposures can negatively impact child social-emotional development, acting in part through maternal psychosocial factors. Future research is needed to further elucidate the mechanisms of intergenerational risk.

Prenatal parenting

Parenting begins before birth. This includes prenatal maternal and paternal bonding with the baby, and biological effects on fetal development. Recent research has confirmed how prenatal maternal stress can alter the development of the fetus and the child, and that this can persist until early adulthood. Children are affected in different ways depending, in part, on their own genetic makeup. The fetus may also have a direct effect on prenatal maternal mood and later parenting behaviour via the placenta. The father is important prenatally too. An abusive partner can increase the mother's prenatal stress and alter fetal development, but he can also be an important source of emotional support. New research suggests the potential benefits of prenatal interventions, including viewing of prenatal scans and cognitive behavioural therapy.