Role of two modules controlling the interaction between SKAP1 and SRC kinases comparison with SKAP2 architecture and consequences for evolution

SRC kinase associated phosphoprotein 1 (SKAP1), an adaptor for protein assembly, plays an important role in the immune system such as stabilizing immune synapses. Understanding how these functions are controlled at the level of the protein-protein interactions is necessary to describe these processes and to develop therapeutics. Here, we dissected the SKAP1 modular organization to recognize SRC kinases and compared it to that of its paralog SRC kinase associated phosphoprotein 2 (SKAP2). Different conserved motifs common to either both proteins or specific to SKAP2 were found using this comparison. Two modules harboring different binding properties between SKAP1 and SKAP2 were identified: one composed of two conserved motifs located in the second interdomain interacting at least with the SH2 domain of SRC kinases and a second one composed of the DIM domain modulated by the SH3 domain and the activation of SRC kinases. This work suggests a convergent evolution of the binding properties of some SRC kinases interacting specifically with either SKAP1 or SKAP2.

Attachment relationship quality with mothers and fathers and child temperament: An individual participant data meta-analysis

A growing body of research suggests that, compared with single parent-child attachment relationships, child developmental outcomes may be better understood by examining the configurations of child-mother and child-father attachment relationships (i.e., attachment networks). Moreover, some studies have demonstrated an above-chance level chance of concordance between the quality of child-mother and child-father attachment relationships, and child temperament has been offered as a plausible explanation for such concordance. To assess whether temperament plays a role in the development of different attachment network configurations, in this preregistered individual participant data meta-analysis we tested the degree to which the temperament dimension of negative emotionality predicts the number of secure, insecure-avoidant, insecure-resistant, and disorganized attachment relationships a child has with mother and father. Data included in the linear mixed effects analyses were collected from seven studies sampling 872 children (49% female; 83% White). Negative emotionality significantly predicted the number of secure (d = -0.12) and insecure-resistant (d = 0.11), but not insecure-avoidant (d = 0.04) or disorganized (d = 0.08) attachment relationships. Nonpreregistered exploratory analyses indicated higher negative emotionality in children with insecure-resistant attachment relationships with both parents compared to those with one or none (d = 0.19), suggesting that temperament plays a small yet significant role in child-mother/child-father insecure-resistant attachment relationships concordance. Taken together, results from this study prompt a more in-depth examination of the mechanism underlying the small yet significantly higher chance that children with increased negative emotionality have for developing multiple insecure-resistant attachment relationships. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Configurations of mother-child and father-child attachment relationships as predictors of child language competence: An individual participant data meta-analysis

An individual participant data meta-analysis was conducted to test pre-registered hypotheses about how the configuration of attachment relationships to mothers and fathers predicts children's language competence. Data from seven studies (published between 1985 and 2014) including 719 children (Mage : 19.84 months; 51% female; 87% White) were included in the linear mixed effects analyses. Mean language competence scores exceeded the population average across children with different attachment configurations. Children with two secure attachment relationships had higher language competence scores compared to those with one or no secure attachment relationships (d = .26). Children with two organized attachment relationships had higher language competence scores compared to those with one organized attachment relationship (d = .23), and this difference was observed in older versus younger children in exploratory analyses. Mother-child and father-child attachment quality did not differentially predict language competence, supporting the comparable importance of attachment to both parents in predicting developmental outcomes.

The PPSQ: assessing parental, child, and partner's playfulness in the preschool and early school years

Introduction

Developmental research has traditionally focused on parenting behaviors such as nurturance and care, due to a focus on mothers' behaviors. Other parenting dimensions such as parental playfulness (i.e., use of creativity, imagination, and humor during parent-child interactions) have comparatively received little attention. Although some measures tap into parents' and children's playfulness, these measures are limited. Indeed, they do not assess multiple domains of playfulness (i.e., both parents' and the child's playfulness) or focus on one specific setting such as children's play with peers. Additionally, existing measures do not consider parents' reactions to their partners' playfulness. To address this gap, we created the Playful Parenting Style Questionnaire (PPSQ), which assesses three domains of playfulness: (a) parental domain, (b) child domain, and (c) partner domain. The current study is part of a validation effort of the PPSQ using a quantitative design. We aimed to explore the structure of the PPSQ by conducting an exploratory factor analysis (EFA) for each domain of playfulness; and assess the construct validity of the PPSQ factors by examining the association between factors and existing measures of playful parenting, child playfulness, and co-parenting.

Method

The sample includes 347 parents (294 mothers and 53 fathers) of preschool/school-age children (M = 5.10 years; 182 girls, 127 boys). Parents were mostly White (76%) and from a low socioeconomic risk background. Parents completed a series of online questionnaires including the PPSQ, 3 existing measures of parent playfulness (Parental Playfulness Questionnaire; Adult Playfulness Scale; Challenging Parenting Behavior Scale), 2 existing measures of child playfulness (Child Behavior Inventory; Children's Playfulness Scale), a coparenting instrument (Co-parenting Relationship Scale), and sociodemographic information.

Results

The EFA revealed 4 factors for parental playfulness, 1 factor for child playfulness, and 3 factors for partner's playfulness. The construct validity analyses identified multiple associations indicating convergence with existing measures for the parent and partners domain but not the child factor.

Discussion

This study allowed for a better understanding of the playful dynamics that occur within a family.

Attachment Injury Severity, Injury-related Stress, Forgiveness, and Sexual Satisfaction in Injured Adult Partners

An attachment injury can occur when one partner violates the assumption that they will provide comfort and caring during a moment of increased need. For injured partners, unresolved attachment injuries can underlie an enduring stress reaction and lower relationship satisfaction. However, no research has examined the associations between the perceived severity of the injury and sexual satisfaction, a central component of relationship well-being. In this cross-sectional study, we examined the direct and indirect associations between the perceived severity of the attachment injury and sexual satisfaction via injury-related stress symptoms and levels of forgiveness, in injured partners. A total of 145 adults who reported having experienced an attachment injury in their current relationship completed self-report questionnaires measuring injury severity, event-related stress, forgiveness, and sexual satisfaction. An indirect association between the perceived severity of the attachment injury and sexual satisfaction through higher injury-related stress and lower forgiveness was found via a path analysis. Results suggest that fostering forgiveness and attending to injury-related stress may be key toward sexual satisfaction in couples where a partner reports an attachment injury. Clinical implications of these results are discussed in light of theory and potential treatment strategies for addressing an attachment injury in couple's therapy.

A meta-analysis of the distribution of preschool and early childhood attachment as assessed in the strange situation procedure and its modified versions

This meta-analysis synthesized the distribution of attachment classifications as coded with the Cassidy-Marvin Preschool Attachment Coding System and the Main-Cassidy Six-Year-Old System. These systems have extended scholars' capacity to measure differences in the developing child-parent attachment relationship, and its sequelae, beyond the infancy period; however, the global distribution of the attachment categories in these systems, and the potential factors influencing this distribution, remain unknown. The meta-analysis included 97 samples (N = 8,186 children; 55% boys), mostly drawn from North American or European populations (89%; M = 76% White). Results indicated that the distribution of child-mother attachment was 53.5% secure, 14.0% avoidant, 11.0% ambivalent, and 21.5% disorganized/controlling. Moderator analyses showed that rates of security were lower, and rates of disorganization were higher, in samples of at-risk families, specifically when children were exposed to maltreatment. Variations in the procedure also moderated the distribution. The discussion calls for greater unity around methodological practices.

SKAP2 Modular Organization Differently Recognizes SRC Kinases Depending on Their Activation Status and Localization

Dimerization of SRC kinase adaptor phosphoprotein 2 (SKAP2) induces an increase of binding for most SRC kinases suggesting a fine-tuning with transphosphorylation for kinase activation. This work addresses the molecular basis of SKAP2-mediated SRC kinase regulation through the lens of their interaction capacities. By combining a luciferase complementation assay and extensive site-directed mutagenesis, we demonstrated that SKAP2 interacts with SRC kinases through a modular organization depending both on their phosphorylation-dependent activation and subcellular localization. SKAP2 contains three interacting modules consisting in the dimerization domain, the SRC homology 3 (SH3) domain, and the second interdomain located between the Pleckstrin homology and the SH3 domains. Functionally, the dimerization domain is necessary and sufficient to bind to most activated and myristyl SRC kinases. In contrast, the three modules are necessary to bind SRC kinases at their steady state. The Pleckstrin homology and SH3 domains of SKAP2 as well as tyrosines located in the interdomains modulate these interactions. Analysis of mutants of the SRC kinase family member hematopoietic cell kinase supports this model and shows the role of two residues, Y390 and K7, on its degradation following activation. In this article, we show that a modular architecture of SKAP2 drives its interaction with SRC kinases, with the binding capacity of each module depending on both their localization and phosphorylation state activation. This work opens new perspectives on the molecular mechanisms of SRC kinases activation, which could have significant therapeutic impact.

Childhood behavioral inhibition and attachment: Links to generalized anxiety disorder in young adulthood

Generalized anxiety disorder (GAD) is under-treated yet prevalent among young adults. Identifying early risk factors for GAD would contribute to its etiological model and identify potential targets for intervention. Insecure attachment patterns, specifically ambivalent and disorganized, have long been proposed as childhood risk factors for GAD. Similarly, childhood behavioral inhibition has been consistently associated with anxiety disorders in adulthood, including GAD. Intolerance of uncertainty (IU), the tendency to react negatively to uncertain situations, has also been shown to be a crucial component of GAD. Furthermore, maternal anxiety is an important feature of developmental models of anxiety including GAD. Yet, to date, no study has examined, within a comprehensive model, how attachment and behavioral inhibition in childhood, maternal anxiety in adolescence, and IU in emerging adulthood contribute to GAD in adulthood. The present study thus examines these links using a longitudinal design with 62 Canadian participants and their mothers. At age 6, participants' attachment and behavioral inhibition were assessed observationally. Maternal anxiety was measured when participants were 14 years of age. IU and GAD were assessed when participants were 21 and 23 years of age, respectively. Structural equation modeling showed that IU mediates the relationships between behavioral inhibition and GAD, while controlling for maternal anxiety. Ambivalent and disorganized-controlling attachment patterns are also indirectly associated with increased GAD symptoms via greater IU scores. Furthermore, a direct and positive effect of behaviorally disorganized attachment was found on GAD symptoms. This longitudinal study supports integrating attachment, behavioral inhibition, and IU in a model of GAD.

Parental psychological distress and child maladjustment: Exploring the moderating role of sibling relationship quality

The aim of this study was to investigate whether the quality of the sibling relationship moderates the association between parental psychological distress and child maladjustment (i.e., internalizing and externalizing problems). We extended previous literature by studying mothers and fathers separately and by including an observational measure of the quality of the sibling relationship. Participants were 52 two-parent families from a community sample who had at least two children living at home. Only one child (aged 6–10 years) was targeted for the study and studied in relation to his/her siblings. Mothers and fathers completed a self-reported questionnaire on their psychological distress and individually assessed their child’s social-emotional maladjustment. The targeted child’s interactions with his/her siblings were observed by independent judges during a home-visit. Results indicate that both maternal and paternal psychological distress are significant predictors of child social-emotional maladjustment. Moderation analyses reveal that children of distressed fathers are at lower risk of social-emotional maladjustment when they engage in highly positive interactions with their siblings. Post hoc analyses suggest that only sibling empathy (not teaching nor companionship) is a significant moderator of the association between paternal psychological distress and child maladjustment. The results of this study provide further evidence of the influence that fathers have in their child’s development and highlight the importance of using a systemic family approach to promote children’s social-emotional adaptation in the context of parental distress.

A meta-analysis on observed paternal and maternal sensitivity

Two meta-analyses were conducted (N = 10,980 child-father dyads) with 93 studies published between 1983-2020, primarily in North America and Europe, on observed parental sensitivity to children (3-180 months; 48% girls; 14% non-White) in partnered mothers and fathers. The first meta-analysis found higher maternal mean levels of observed sensitivity, with a small effect size (d = -.27). Differences between parents were larger with micro coding and triadic/family assessments. Differences narrowed as a function of publication year and were not significant in European samples. The second meta-analysis identified a moderate correlation between observed maternal and paternal sensitivity (r = .23 after adjusting for probable publication bias). Correlations were larger in Middle Eastern samples and with composite sensitivity scales.

Do child-father and child-mother preschool insecure attachment types predict the development of externalizing behaviors in boys and girls during middle childhood?

Past meta-analyses show that both child-mother and child-father attachment insecurity are independently and jointly associated with more externalizing behaviors in children. Little is known, however, on the ways that different types of insecure attachment independently and jointly predict the development of externalizing behaviors over time. Existing work also neglects the impact of children's gender within the context of child-father relationships. The current study addresses these limitations by investigating how insecure type of child-father attachment, child-mother attachment, and their interaction in the preschool years predict boys' and girls' externalizing behaviors in middle childhood, when controlling for children's externalizing behaviors in the preschool years. The sample included 144 preschool-aged children (M = 46.89 months, SD = 8.77, 83 girls) and both of their parents. At Time 1, children completed independent separation-reunion procedures with each parent, which were coded using the Preschool Attachment Rating Scales. At Time 1 and Time 2 (5 years later), mothers and fathers completed the Strengths and Difficulties Questionnaire to report on their children's externalizing behaviors. Results showed no systematic differences in the way that child-mother and child-father attachment predicted the development of externalizing behaviors in boys and girls. Across all children, results identified an interaction of child-father and child-mother ambivalence, by which the presence of ambivalence toward both parents predicted the development of more externalizing behaviors. In addition, child-father controlling-caregiving attachment predicted the development of fewer externalizing behaviors. These results provide insight into the ways that insecure child-father and child-mother attachment predict later socioemotional adaptation. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Configurations of mother-child and father-child attachment as predictors of internalizing and externalizing behavioral problems: An individual participant data (IPD) meta-analysis

An unsettled question in attachment theory and research is the extent to which children's attachment patterns with mothers and fathers jointly predict developmental outcomes. In this study, we used individual participant data (IPD) meta-analysis to assess whether early attachment networks with mothers and fathers are associated with children's internalizing and externalizing behavioral problems. Following a pre-registered protocol, data from 9 studies and 1,097 children (mean age: 28.67 months) with attachment classifications to both mothers and fathers were included in analyses. We used a linear mixed effects analysis to assess differences in children's internalizing and externalizing behavioral problems as assessed via the average of both maternal and paternal reports based on whether children had two, one, or no insecure (or disorganized) attachments. Results indicated that children with an insecure attachment relationship with one or both parents were at higher risk for elevated internalizing behavioral problems compared with children who were securely attached to both parents. Children whose attachment relationships with both parents were classified as disorganized had more externalizing behavioral problems compared to children with either one or no disorganized attachment relationship with their parents. Across attachment classification networks and behavioral problems, findings suggest (a) an increased vulnerability to behavioral problems when children have insecure or disorganized attachment to both parents, and (b) that mother-child and father-child attachment relationships may not differ in the roles they play in children's development of internalizing and externalizing behavioral problems.

Longitudinal and concurrent relationships between caregiver-child behaviours in the vaccination context and preschool attachment

ABSTRACT

This article consists of 2 separate studies in which the overarching aim was to examine the relationships between caregiver-child behaviours in the vaccination context (infant and preschool) and preschool attachment outcomes. It provides for the first time an examination of acute pain behaviours during early childhood and how it relates to a critical aspect of child development (ie, attachment status) at the end of early childhood. Study 1 examined the longitudinal relationships between caregiver-infant behaviours during infants' first routine vaccination (2 months) and preschool attachment (n = 84). Study 2 examined the concurrent relationships between caregiver-preschooler behaviours during the last routine vaccination of preschool (4-5 years) and preschool attachment (n = 117). Hierarchical multiple regression analyses were used. Although there were several nonsignificant findings, the results revealed that higher caregiver sensitivity and higher proximal soothing 1 minute before the needle during infants' 2-month vaccinations predicted higher levels of preschooler avoidance and lower levels of preschooler ambivalence, respectively. In addition, higher infant pain-related distress at 2 minutes after the needle was related to higher preschooler security and lower preschooler disorganization and controlling-punitive attachments. In terms of concurrent relationships, only caregiver sensitivity was significantly related to preschool attachment outcomes. Specifically, higher caregiver sensitivity at preschoolers' 4- to 5-year vaccinations was related to higher preschooler attachment security. The study findings provide evidence that child-caregiver behavioural patterns during the infant and preschool routine vaccination relate to preschoolers' patterns of attachment. Moreover, it underscores the potential importance of health professionals teaching and supporting attuned caregiving to the child in pain.

The longitudinal and concurrent relationship between caregiver sensitivity and preschool attachment: A systematic review and meta-analysis

The present study aimed to systematically review and meta-analyze the concurrent and longitudinal relationship between caregiver sensitivity and preschool attachment measured using the Main and Cassidy (1988) and Cassidy and Marvin (1992) attachment classification systems. This review was pre-registered with the International Prospective Register of Systematic Reviews (PROSPERO; Registration Number CRD42017073417) and completed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The present review identified 36 studies made up of 21 samples (N = 3, 847) examining the relationship between caregiver sensitivity and preschool attachment. Eight primary meta-analyses were conducted separately according to the proximity of the assessment of sensitivity to attachment (i.e., concurrent versus longitudinal), operationalization of caregiver sensitivity (i.e., unidimensional versus multidimensional) and attachment categorizations (i.e., secure-insecure versus organized-disorganized). Overall, the meta-analyses revealed higher levels of caregiver sensitivity among caregivers with secure and organized preschoolers, relative to insecure and disorganized preschoolers, respectively. Medium effect sizes (g = .46 to .59) were found for both longitudinal and concurrent associations between caregiver sensitivity and preschool attachment when a unidimensional measure of caregiver sensitivity was employed, compared to small to medium effect sizes (g = .34 to .49) when a multidimensional measure of caregiver sensitivity was employed. Child age at attachment measurement was a significant moderator of the longitudinal association between unidimensional caregiver sensitivity and preschool attachment. Future directions for the literature and clinical implications are discussed.

Maternal expressions of positive emotion for children predicts children's respiratory sinus arrhythmia surrounding stress

The aim of this study is to assess whether positive emotional exchanges (i.e., emotion coregulation) within the mother-child dyad play a protective role in children's physiological response to a distressing task. Specifically, we test whether positive emotion coregulation among mothers and their preschool-aged children is associated with children's respiratory sinus arrhythmia (RSA) at baseline, during, and following a frustration task. One hundred Singaporean mother-child dyads (M_childage  = 3.5 years) participated in a standardized "Laughing Task" in which positive emotional constructs were measured. Children also participated in a frustration task while RSA was continuously monitored. Hierarchical linear regressions revealed that greater maternal positive emotional responses to children were associated with child RSA at baseline and in recovery from frustration, but not during frustration. These findings have implications for the important role that positive emotion responsivity from mothers may play in children's developing autonomic response systems, and underscore the need for longitudinal work on this topic.

Developmental and attachment-based perspectives on dissociation: beyond the effects of maltreatment

Background: Numerous years of theory and research have informed our understanding of the caregiving experiences that confer vulnerability for dissociation. This work has resulted in widespread agreement on the role of childhood maltreatment as an aetiological factor. Objective: With clear integration of this perspective, the current paper draws attention to the spectrum of vulnerability that can exist over and above the trauma of maltreatment within early caregiving experiences. Method: An integrative review of the developmental literature on dissociation is presented. Results: We first review and integrate existing developmental theories of dissociation into a more unified perspective, highlighting a combination of defensive and intersubjective pathways towards dissociative outcomes. Next, we present empirical research demonstrating which specific caregiving experiences are associated with dissociation. Lastly, we review recent neurodevelopmental research demonstrating that (non-extreme) caregiving stressors during infancy impact the developing limbic structures in the brain. We conclude by offering directions for future research. Conclusion: Findings make the case for approaching assessments of the caregiver-child relationship with discernment of factors beyond the presence/absence of maltreatment when conceptualizing risk pathways toward dissociation.

The contributions of child-mother attachment, maternal parenting stress, and military status to the prediction of child behavior problems

Studies show that children with a military parent are at heightened risk of the development of behavior problems. However, there is limited work examining how other factors experienced by military families may also influence behavior problems. In the current study, we recruited three types of Canadian families with a preschooler: families with a deployed military member, families with a nondeployed military member, and nonmilitary families. We examined whether the nonmilitary parent's (in all cases the mother) parenting stress and attachment relationship with the child are associated with behavior problems, and whether deployment status further contributes to the prediction. Child-mother dyads participated in an observed attachment assessment, and mothers reported on their stress levels and their child's behavior. Results showed that both child attachment insecurity and parenting stress were associated with elevated levels of internalizing problems; however, only parenting stress was associated with conduct problems. Military deployment predicted higher levels of internalizing and conduct problems beyond the contributions of attachment and stress. Furthermore, having a father in the military (whether deployed or not) also contributed to internalizing problems. These findings shed light on how the military lifestyle impacts early childhood mental health through the complex interplay between various parts of their environment.

Associations between mother-preschooler attachment and maternal depression symptoms: A systematic review and meta-analysis

The current study aimed to systematically review and meta-analyze concurrent and longitudinal associations between maternal depression symptoms and mother-child attachment during the preschool period (aged 2 to 7 years) as assessed using the coding systems by Cassidy and Marvin (1992) and Main and Cassidy (1988). The review was pre-registered with PROSPERO (International Prospective Register of Systematic Reviews; Registration number CRD42017073417) and was conducted in accordance with PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. A total of 7,969 records were screened and 18 articles were deemed as eligible for inclusion in the review. Studies were reviewed using qualitative synthesis techniques and, where appropriate, meta-analysis. Qualitative synthesis indicated that mothers of disorganized/controlling children most consistently reported the highest levels of depressive symptoms, both concurrently and longitudinally. The association between disorganized/controlling child attachment and concurrent maternal depressive symptoms was significant (n = 1,787; g = 0.27, 95% CI [0.13,0.40]), and was not moderated by sample type, child gender, or risk of bias. Findings of a relationship between child attachment insecurity and maternal depressive symptoms must be qualified due to significant within-study heterogeneity and publication bias. Results suggest that maternal depressive symptoms may confer risk for disorganized/controlling attachment during the preschool period.

DEPLOYMENT STATUS: A DIRECT OR INDIRECT EFFECT ON MOTHER-CHILD ATTACHMENT WITHIN A CANADIAN MILITARY CONTEXT?

Research has suggested that military spouses experience increased depressive symptoms and parenting stress during a military member's deployment. A relationship between maternal depressive symptoms, parenting stress, and child attachment security has been found in the general population, as has an indication that social support may provide a buffering effect. While there appears to be an association between the emotional well-being of military spouses and child emotional well-being during deployment, data are limited regarding the association between maternal emotional well-being and child attachment security. The current study explores the association between deployment status and child attachment to the nonmilitary parent (i.e., the mother in this study) in a sample of 68 Canadian military families. Results revealed a significant impact of deployment status on maternal depressive symptoms and on quality of child attachment. The impact of deployment status on attachment was not mediated through the maternal variables, and despite a main effect of social support on the maternal variables, there was no moderating effect. Thus, our results suggest that deployment may affect child attachment independently of maternal well-being.

The SRC-family tyrosine kinase HCK shapes the landscape of SKAP2 interactome

The SRC Kinase Adaptor Phosphoprotein 2 (SKAP2) is a broadly expressed adaptor associated with the control of actin-polymerization, cell migration, and oncogenesis. After activation of different receptors at the cell surface, this dimeric protein serves as a platform for assembling other adaptors such as FYB and some SRC family kinase members, although these mechanisms are still poorly understood. The goal of this study is to map the SKAP2 interactome and characterize which domains or binding motifs are involved in these interactions. This is a prerequisite to finely analyze how these pathways are integrated in the cell machinery and to study their role in cancer and other human diseases when this network of interactions is perturbed. In this work, the domain and the binding motif of fourteen proteins interacting with SKAP2 were precisely defined and a new interactor, FAM102A was discovered. Herein, a fine-tuning between the binding of SRC kinases and their activation was identified. This last process, which depends on SKAP2 dimerization, indirectly affects the binding of FYB protein. Analysis of conformational changes associated with activation/inhibition of SRC family members, presently limited to their effect on kinase activity, is extended to their interactive network, which paves the way for therapeutic development.

Detecting multi-way epistasis in family-based association studies

The era of genome-wide association studies (GWAS) has led to the discovery of numerous genetic variants associated with disease. Better understanding of whether these or other variants interact leading to differential risk compared with individual marker effects will increase our understanding of the genetic architecture of disease, which may be investigated using the family-based study design. We present M-TDT (the multi-locus transmission disequilibrium test), a tool for detecting family-based multi-locus multi-allelic effects for qualitative or quantitative traits, extended from the original transmission disequilibrium test (TDT). Tests to handle the comparison between additive and epistatic models, lack of independence between markers and multiple offspring are described. Performance of M-TDT is compared with a multifactor dimensionality reduction (MDR) approach designed for investigating families in the hypothesis-free genome-wide setting (the multifactor dimensionality reduction pedigree disequilibrium test, MDR-PDT). Other methods derived from the TDT or MDR to investigate genetic interaction in the family-based design are also discussed. The case of three independent biallelic loci is illustrated using simulations for one- to three-locus alternative hypotheses. M-TDT identified joint-locus effects and distinguished effectively between additive and epistatic models. We showed a practical example of M-TDT based on three genes already known to be implicated in malaria susceptibility. Our findings demonstrate the value of M-TDT in a hypothesis-driven context to test for multi-way epistasis underlying common disease etiology, whereas MDR-PDT-based methods are more appropriate in a hypothesis-free genome-wide setting.

Correlates of child-father and child-mother attachment in the preschool years

The increase in fathers' involvement in childrearing, particularly beyond infancy, warrants research exploring factors influencing the quality of child-father attachment relationships, and the impact of these relationships on children's social development. The current investigation explored various correlates of preschoolers' child-father attachment security to both parents, including contextual factors (i.e., socioeconomic status, child temperament, parenting stress), parental play sensitivity, and child social adaptation. Participants included 107 preschool-aged children (59 girls; M = 46.67 months, SD = 8.57) and their fathers and mothers. Results revealed that both mothers' and fathers' play sensitivity were associated with child attachment security after controlling for different contextual factors. Furthermore, the magnitude of the association between child conduct problems and child-father attachment insecurity was stronger than the corresponding association with child-mother attachment insecurity. Findings provide important information on caregiving factors associated with child-father attachment security in the preschool years and the importance of this bond to children's social adaptation.

The Mediating Effects of Emotion Regulation and Dyadic Coping on the Relationship Between Romantic Attachment and Non-suicidal Self-injury

Insecure attachment is believed to play a fundamental role in non-suicidal self-injury (NSSI). In fact, the quality of parent-child attachment relationships has become an emerging topic attracting a growing number of theoretical and research contributions in the field of NSSI. However, despite these considerable advances in the scientific study of NSSI, progress pertaining to investigating the quality of romantic attachment relationship is lacking. In an effort to expand current knowledge, the present study aims to not only explore the relationships between romantic attachment and NSSI, but also to explore the mechanisms by which these two variables relate by examining the mediating role that emotion regulation and dyadic coping might play in this relationship. Participants consisted of 797 (81.9 % female) university students, all of whom were involved in a romantic relationship for at least 6 months and between the ages of 17 and 25. Results revealed that although difficulties in emotion regulation mediated the relationships between romantic attachment insecurity (i.e., attachment anxiety and avoidance) and NSSI, dyadic coping was not found to be a significant mediator. These results highlight the importance of attachment security and internal processes to manage stress in the prevention of NSSI.

Is the maternal Q-Set a valid measure of preschool child attachment behavior?

The objective of this study is to examine preschool-age correlates of the maternal version of the Attachment Q-Set (AQS) (Waters & Deane, 1985) in order to provide validity data. Concurrent associations between the Attachment Q-Set and measures of separation-reunion attachment classifications (Cassidy & Marvin, 1992), quality of mother–child interaction, maternal stress, and child externalizing behavior problems were examined for a low-risk sample of 152 preschool children. Results showed that, even after controlling for maternal stress, ambivalent and disorganized children had lower scores on the AQS when compared with the secure group. However, avoidant and controlling children did not differ from secure children in maternal sorts. Significant associations between the maternal Q-Set and affective quality of mother–child interaction were also maintained, when controlling for maternal stress. The AQS was significantly associated with both mother and teacher reported externalizing behavior problem reports, but the association with teacher reports was not maintained when maternal stress was entered in the equation as a covariate. The discussion focuses on the validity of the maternal Q-Set as a measure of child attachment behavior in preschoolers.

Attachment Representations in a Sample of Neglected Preschool-Age Children

A number of studies (see Éthier, 1999) have shown that neglect has a deleterious impact on children's development. However, the effect of neglect on a child's internal representations of their family still needs to be investigated. The aim of this study was to examine the attachment patterns observed in a subsample of neglected children as compared with a control group, using a representational assessment method. The overall sample consisted of 74 preschool-age children, with a clinical group comprised of 39 children referred to social services because of neglect and a control group including 35 children recruited in ordinary kindergartens. Children's attachment representations were assessed with the Doll Play Narrative Classification System (George and Solomon, 1990, 1996, 2000) as well as the complementary Disorganization Scales (George and Solomon, 1998). Mothers' reports consisted of: (1) an in-house socio-demographical questionnaire and (2) the shorter French version of the Parental Stress Index (Bigras et al., 1996). Results showed: (1) a significant difference in attachment representation classifications between the neglected group and the control group even when socio-economic status and maternal stress were controlled for and (2) a significantly higher proportion of avoidant attachment classification in the neglected group. Moreover, neglected avoidant children displayed more overall disorganized markers, and specifically more frightening markers, than normative avoidant children; they also depicted their mother as being less available than normative children. These results are discussed in the light of other findings as well as on theoretical grounds.

Modulation of Malaria Phenotypes by Pyruvate Kinase (PKLR) Variants in a Thai Population

Pyruvate kinase (PKLR) is a critical erythrocyte enzyme that is required for glycolysis and production of ATP. We have shown that Pklr deficiency in mice reduces the severity (reduced parasitemia, increased survival) of blood stage malaria induced by infection with Plasmodium chabaudi AS. Likewise, studies in human erythrocytes infected ex vivo with P. falciparum show that presence of host PK-deficiency alleles reduces infection phenotypes. We have characterized the genetic diversity of the PKLR gene, including haplotype structure and presence of rare coding variants in two populations from malaria endemic areas of Thailand and Senegal. We investigated the effect of PKLR genotypes on rich longitudinal datasets including haematological and malaria-associated phenotypes. A coding and possibly damaging variant (R41Q) was identified in the Thai population with a minor allele frequency of ~4.7%. Arginine 41 (R41) is highly conserved in the pyruvate kinase family and its substitution to Glutamine (R41Q) affects protein stability. Heterozygosity for R41Q is shown to be associated with a significant reduction in the number of attacks with Plasmodium falciparum, while correlating with an increased number of Plasmodium vivax infections. These results strongly suggest that PKLR protein variants may affect the frequency, and the intensity of malaria episodes induced by different Plasmodium parasites in humans living in areas of endemic malaria.

Attachment and Temperament Revisited: Infant Distress, Attachment Disorganization, and the Serotonin Transporter Polymorphism

OBJECTIVE

This study's aim was to evaluate whether infant disorganized attachment and infant proneness to distress exhibited differential relations to infant genetic factors as indexed by the serotonin transporter polymorphism.

BACKGROUND

The role of the short allele of the serotonin transporter polymorphism (5-HTTLPR) in enhancing sensitivity to fearful and negative affect has been well-established (Canli & Lesch, 2007). In the current study, we used this known property of the short allele to provide a test of an important postulate of attachment theory, namely that infant attachment security or disorganization is not a function of the infant's proneness to distress.

METHODS

Participants were 39 parents and infants assessed between 12 and 18 months in the Strange Situation procedure. Genotype categories for the 5-HTTLPR (and rs25531) were created by both the original and the reclassified grouping system; infant proneness to distress was assessed directly in the Strange Situation Procedure. We also assessed maternal behavior at 18 months to evaluate whether any observed genetic effect indicated a passive effect through the mother.

RESULTS

Consistent with previous findings, the 5-HTTLPR short allele was significantly related to the infant's wariness and distress, but was not related to attachment security or attachment disorganization. In addition, maternal disrupted interaction with the infant was not related to infant genotype or infant distress.

CONCLUSION

Results support the concept that infant proneness to distress is associated with serotonergic factors while infant attachment security or disorganization is not a function of either 5-HTTLPR or behaviorally rated proneness to distress.

Emotion dysregulation mediates the influence of relationship difficulties on non-suicidal self-injury behavior in young adults

This study examined associations between relationship difficulties with parents and peers and non-suicidal self-injury (NSSI). Particular emphasis was placed on examining mediating pathways through emotion dysregulation, as per commonly accepted theory. Participants were 1153 university students (905 females; Mage=19.35 years, S.D.=1.49); 79 of these participants had engaged in NSSI during the previous 6 months (63 females, Mage=19.35 years, S.D.=1.51). Participants completed questionnaires assessing NSSI, quality of relationships with parents and peers, and emotion dysregulation. Hierarchical logistic regressions suggest that the quality of parent-child relationships has a greater impact on the prediction of NSSI engagement than the quality of peer relationships. Results of a structural equation model showed that feelings of alienation in both parent and peer relationships had indirect effects on NSSI through deficits in emotion regulation (ER). Results suggest the importance of examining emotion dysregulation in association with NSSI, and that both parent and peer relationships are implicated in NSSI engagement through emotion regulation deficits. Important clinical implications regarding the need to acknowledge both emotion dysregulation and interpersonal difficulties when treating NSSI in young adults are discussed.

Filter-free exhaustive odds ratio-based genome-wide interaction approach pinpoints evidence for interaction in the HLA region in psoriasis

Background

Deciphering the genetic architecture of complex traits is still a major challenge for human genetics. In most cases, genome-wide association studies have only partially explained the heritability of traits and diseases. Epistasis, one potentially important cause of this missing heritability, is difficult to explore at the genome-wide level. Here, we develop and assess a tool based on interactive odds ratios (I_OR), Fast Odds Ratio-based sCan for Epistasis (FORCE), as a novel approach for exhaustive genome-wide epistasis search. I_OR is the ratio between the multiplicative term of the odds ratio (OR) of having each variant over the OR of having both of them. By definition, an I_OR that significantly deviates from 1 suggests the occurrence of an interaction (epistasis). As the I_OR is fast to calculate, we used the I_OR to rank and select pairs of interacting polymorphisms for P value estimation, which is more time consuming.

Results

FORCE displayed power and accuracy similar to existing parametric and non-parametric methods, and is fast enough to complete a filter-free genome-wide epistasis search in a few days on a standard computer. Analysis of psoriasis data uncovered novel epistatic interactions in the HLA region, corroborating the known major and complex role of the HLA region in psoriasis susceptibility.

Conclusions

Our systematic study revealed the ability of FORCE to uncover novel interactions, highlighted the importance of exhaustiveness, as well as its specificity for certain types of interactions that were not detected by existing approaches. We therefore believe that FORCE is a valuable new tool for decoding the genetic basis of complex diseases.

Electronic supplementary material

The online version of this article (doi:10.1186/s12863-015-0174-3) contains supplementary material, which is available to authorized users.

Psychometric properties of the mother and father compulsive caregiving scales: a brief measure of current young adult caregiving behaviors toward parents

This study assessed the psychometric properties of the Mother and Father Compulsive Caregiving Scales (MFCC). Exploratory (N = 1283, 71.5% Caucasian) and confirmatory (N = 2203, 76.6% Caucasian) factor analyses revealed two-factor structures for each parent: burden and autonomy. Correlational analyses with retrospective self-reports of parent-child relationship quality, family risk indicators, and psychological symptoms demonstrated similar convergent validity for both mother and father burden factors while, interestingly, the findings for mother and father autonomous factors showed different patterns. Results support that the MFCC is a short and convenient measure that would be clinically useful for the assessment of controlling/caregiving behaviors in young adulthood.

Psychometric properties of the functions and addictive features scales of the Ottawa Self-Injury Inventory: a preliminary investigation using a university sample

Nonsuicidal self-injury (NSSI) is an issue primarily of concern in adolescents and young adults. Thus far, no single NSSI self-report measure offers a fully comprehensive assessment of NSSI, particularly including measurement of both its functions and potential addictive features. The Ottawa Self-Injury Inventory (OSI) permits simultaneous assessment of both these characteristics; the current study examined the psychometric properties of this measure in a sample of 149 young adults in a university student sample (82.6% girls, Mage = 19.43 years). Exploratory factor analyses revealed 4 functions factors (internal emotion regulation, social influence, external emotion regulation, and sensation seeking) and a single addictive features factor. Convergent evidence for the functions factor scores was demonstrated through significant correlations with an existing measure of NSSI functions and indicators of psychological well-being, risky behaviors, and context and frequency of NSSI behaviors. Convergent evidence was also shown for the addictive features scores, through associations with NSSI frequency, feeling relieved following NSSI, and inability to resist NSSI urges. Additional comment is made regarding the potential for addictive features of NSSI to be both negatively and positively reinforcing. Results show preliminary psychometric support for the OSI as a valid and reliable assessment tool to be used in both research and clinical contexts. The OSI can provide important information for case formulation and treatment planning, given the comprehensive and all-inclusive nature of its assessment capacities.

The NeST long ncRNA controls microbial susceptibility and epigenetic activation of the interferon-γ locus

Long noncoding RNAs (lncRNAs) are increasingly appreciated as regulators of cell-specific gene expression. Here, an enhancer-like lncRNA termed NeST (nettoie Salmonella pas Theiler's [cleanup Salmonella not Theiler's]) is shown to be causal for all phenotypes conferred by murine viral susceptibility locus Tmevp3. This locus was defined by crosses between SJL/J and B10.S mice and contains several candidate genes, including NeST. The SJL/J-derived locus confers higher lncRNA expression, increased interferon-γ (IFN-γ) abundance in activated CD8(+) T cells, increased Theiler's virus persistence, and decreased Salmonella enterica pathogenesis. Transgenic expression of NeST lncRNA alone was sufficient to confer all phenotypes of the SJL/J locus. NeST RNA was found to bind WDR5, a component of the histone H3 lysine 4 methyltransferase complex, and to alter histone 3 methylation at the IFN-γ locus. Thus, this lncRNA regulates epigenetic marking of IFN-γ-encoding chromatin, expression of IFN-γ, and susceptibility to a viral and a bacterial pathogen.

High number of previous Plasmodium falciparum clinical episodes increases risk of future episodes in a sub-group of individuals

There exists great disparity in the number of clinical P. falciparum episodes among children of the same age and living in similar conditions. The epidemiological determinants of such disparity are unclear. We used a data-mining approach to explore a nineteen-year longitudinal malaria cohort study dataset from Senegal and identify variables associated with increased risk of malaria episodes. These were then verified using classical statistics and replicated in a second cohort. In addition to age, we identified a novel high-risk group of children in whom the history of P. falciparum clinical episodes greatly increased risk of further episodes. Age and a high number of previous falciparum clinical episodes not only play major roles in explaining the risk of P. falciparum episodes but also are risk factors for different groups of people. Combined, they explain the majority of falciparum clinical attacks. Contrary to what is widely believed, clinical immunity to P. falciparum does not de facto occur following many P. falciparum clinical episodes. There exist a sub-group of children who suffer repeated clinical episodes. In addition to posing an important challenge for population stratification during clinical trials, this sub-group disproportionally contributes to the disease burden and may necessitate specific prevention and control measures.

A comparison of invalidating family environment characteristics between university students engaging in self-injurious thoughts & actions and non-self-injuring university students

Individuals experiencing non-suicidal self-injurious (NSSI) thoughts only are greatly overlooked by current research. This investigation aimed at determining how three groups of university students differed in their reported quality of childhood relationships with parents, and histories of physical and sexual abuses. These groups included students experiencing only NSSI thoughts (n = 126), students engaging in NSSI actions (n = 90), and students exhibiting neither (n = 1,080). Results showed that individuals experiencing NSSI thoughts only, and those engaging in NSSI actions reported poorer relationships with parents and more physical abuse than the No NSSI group; however, NSSI thoughts and NSSI action groups had similar outcomes to one another for most variables. These findings suggest that individuals experiencing only NSSI thoughts share similar negative childhood environments associated with engagement in NSSI action and that they should be included in future research, particularly investigations aimed at identifying protective factors that could prevent them from engaging in NSSI.

Behavioural precursors of attachment representations in middle childhood and links with child social adaptation

Concordance between age-6 attachment behaviour and age-8 doll play attachment representations during the school-age period, and associations between these measures and child social adaptation at school were examined. One hundred and twenty-nine 6-year-olds and their mothers participated in a separation/reunion protocol. Two years later, 104 children completed a doll play narrative task. Teachers evaluated child behaviour problems and prosocial behaviour at both ages. Results showed a significant four-way concordance between age-6 attachment behaviour and age-8 doll play classifications. Each of the four attachment classifications was concordant in the absence of major negative life-events, but only the disorganized classifications remained concordant when at least one negative life-event occurred between the two assessment times. Children with a disorganized attachment classification or representation had higher externalizing scores than secure and avoidant children at both timepoints. Finally, the avoidant and disorganized behavioural classifications predicted avoidant and disorganized representations, respectively, even when controlling for age-6 teacher reports of social adaptation.

Links between children's attachment behavior at early school-age, their attachment-related representations, and behavior problems in middle childhood

The objective of the present study was to examine associations between children's attachment behavior at early school-age, dimensions of narrative performance, and behavior problems as assessed in middle childhood. Children's attachment patterns with mother were assessed at age 6 ( N = 127) using the Main and Cassidy (1988) separation—reunion classification system. Two years later, these children ( N = 109) completed the Narrative Story Stem Battery (Bretherton, Oppenheim, Buchsbaum, Emde, & The MacArthur Narrative Group, 1990), and teachers rated their level of behavior problems using the Social Behavior Questionnaire (Tremblay, Vitaro, Gagnon, Piché, & Royer, 1992). Results indicated that secure children depicted fewer conflict themes in their narratives than did disorganized/controlling children, produced more discipline themes than avoidant children, and had higher coherence scores than ambivalent children. Avoidant children also depicted fewer conflict themes than disorganized/controlling children. Finally, children's narrative conflict themes significantly predicted both level of externalizing and total behavior problems, even after controlling for variance explained by gender and disorganized/controlling attachment behavior. Girls' narratives were more likely to evoke discipline and affection/affiliation themes, and to be more coherent than boys' narratives.

Maternal depressive symptoms in infancy: unique contribution to children's depressive symptoms in childhood and adolescence?

This prospective 20-year study assessed associations between maternal depressive symptoms in infancy, childhood, and adolescence, and child and adolescent depressive symptoms in a sample of families at high psychosocial risk. Maternal symptomatology was assessed with the Center for Epidemiological Studies Depression Scale (CES-D) when children were infants (12 months), school-aged (age 8), and adolescents (age 19). Children's depressive symptoms were measured at age 8 (Dimensions of Depression Profile for Children and Adolescents) and age 19 (CES-D). Maternal depressive symptoms during infancy contributed to the prediction of child depressive symptoms at age 8, after controlling for concurrent maternal depressive symptoms, clinical risk in infancy, and gender. Clinical risk in infancy marginally contributed to the prediction model. Disorganization of attachment in infancy and maternal hostility were independent predictors of depressive symptoms at age 8 and did not mediate the relation between maternal and child depressive symptoms. Depressive symptoms in adolescence were predicted by gender, children's depressive symptoms at age 8, maternal depressive symptoms in adolescence, and maternal depressive symptoms in infancy. There was no moderating effect of gender. Adding to previous evidence on the importance of early maternal depression, maternal depressive symptoms during infancy were related to the development of depressive symptoms in childhood and adolescence even when other variables of potential relevance were controlled.

Cortisol response to interpersonal stress in young adults with borderline personality disorder: a pilot study

Hypothalamic-pituitary-adrenal axis dysregulation after stress was found to be associated with borderline personality disorder (BPD). Nine female BPD young adults and 12 control subjects were investigated for stress reactivity and recovery after an interpersonal conflict discussion with their mothers. BPD subjects showed a delayed cortisol response after psychosocial stress.

Cortisol response to interpersonal stress in young adults with borderline personality disorder: a pilot study

Hypothalamic-pituitary-adrenal axis dysregulation after stress was found to be associated with borderline personality disorder (BPD). Nine female BPD young adults and 12 control subjects were investigated for stress reactivity and recovery after an interpersonal conflict discussion with their mothers. BPD subjects showed a delayed cortisol response after psychosocial stress.

Interleukin 22 is a candidate gene for Tmevp3, a locus controlling Theiler's virus-induced neurological diseases

After intracerebral inoculation, Theiler's virus induces in its natural host, the mouse, an acute encephalomyelitis followed, in susceptible animals, by chronic inflammation and primary demyelination. Susceptibility to demyelination among strains of laboratory mice is explained by the capacity of the immune system to control viral load during persistence. Also, differences of susceptibility to viral load between the susceptible SJL strain and the resistant B10.S strain are mainly due to two loci, Tmevp2 and Tmevp3, located close to the Ifng locus on chromosome 10. In this article, we show that the Tmevp3 locus controls both mortality during the acute encephalomyelitis and viral load during persistence. Most probably, two genes located in the Tmevp3 interval control these two different phenotypes with efficiencies that depend on the age of the mouse at inoculation. Il22, a member of the IL-10 cytokine family, is a candidate gene for the control of mortality during the acute encephalomyelitis.