Short motif sequences determine the targets of the prokaryotic CRISPR defence system

Clustered regularly interspaced short palindromic repeats (CRISPR) and their associated CRISPR-associated sequence (CAS) proteins constitute a novel antiviral defence system that is widespread in prokaryotes. Repeats are separated by spacers, some of them homologous to sequences in mobile genetic elements. Although the whole process involved remains uncharacterized, it is known that new spacers are incorporated into CRISPR loci of the host during a phage challenge, conferring specific resistance against the virus. Moreover, it has been demonstrated that such interference is based on small RNAs carrying a spacer. These RNAs would guide the defence apparatus to foreign molecules carrying sequences that match the spacers. Despite this essential role, the spacer uptake mechanism has not been addressed. A first step forward came from the detection of motifs associated with spacer precursors (proto-spacers) of Streptococcus thermophilus, revealing a specific recognition of donor sequences in this species. Here we show that the conservation of proto-spacer adjacent motifs (PAMs) is a common theme for the most diverse CRISPR systems. The PAM sequence depends on the CRISPR-CAS variant, implying that there is a CRISPR-type-specific (motif-directed) choice of the spacers, which subsequently determines the interference target. PAMs also direct the orientation of spacers in the repeat arrays. Remarkably, observations based on such polarity argue against a recognition of the spacer precursors on transcript RNA molecules as a general rule.

Diversity of CRISPR loci in Escherichia coli

CRISPR (clustered regularly interspaced short palindromic repeats) and CAS (CRISPR-associated sequence) proteins are constituents of a novel genetic barrier that limits horizontal gene transfer in prokaryotes by means of an uncharacterized mechanism. The fundamental discovery of small RNAs as the guides of the defence apparatus arose as a result of Escherichia coli studies. However, a survey of the system diversity in this species in order to further contribute to the understanding of the CRISPR mode of action has not yet been performed. Here we describe two CRISPR/CAS systems found in E. coli, following the analysis of 100 strains representative of the species' diversity. Our results substantiate different levels of activity between loci of both CRISPR types, as well as different target preferences and CRISPR relevances for particular groups of strains. Interestingly, the data suggest that the degeneration of one CRISPR/CAS system in E. coli ancestors could have been brought about by self-interference.

Risky online behaviors among adolescents: Longitudinal relations among problematic Internet use, cyberbullying perpetration, and meeting strangers online

Background and aims This study aims to analyze the cross-sectional and longitudinal relationship between three major risky online behaviors during adolescence: problematic Internet use, cyberbullying perpetration, and meeting strangers online. An additional objective was to study the role of impulsivity-irresponsibility as a possible explanatory variable of the relationships between these risky online behaviors. Methods The study sample was 888 adolescents that completed self-report measures at time 1 and time 2 with an interval of 6 months. Results The findings showed a significant cross-sectional relationship between the risky online behaviors analyzed. At the longitudinal level, problematic Internet use at time 1 predicted an increase in the perpetration of cyberbullying and meeting strangers online at time 2. Furthermore, meeting strangers online increased the likelihood of cyberbullying perpetration at time 2. Finally, when impulsivity-irresponsibility was included in the model as an explanatory variable, the relationships previously found remained significant. Discussion These results extend traditional problem behavior theory during adolescence, also supporting a relationship between different risky behaviors in cyberspace. In addition, findings highlighted the role of problematic Internet use, which increased the chances of developing cyberbullying perpetration and meeting strangers online over time. However, the results suggest a limited role of impulsivity-irresponsibility as an explicative mechanism. Conclusions The findings suggest that various online risk activities ought to be addressed together when planning assessment, prevention and intervention efforts.

Spanish validation of the Family Questionnaire (FQ) in families of patients with an eating disorder

BACKGROUND

The objective of this study is to evaluate the psychometric properties of the Spanish version of the Family Questionnaire (FQ) and to further examine the differences between mothers' and fathers' emotional response to an eating disorder (ED).

METHOD

A total of 382 carers of patients with an ED participated in the study, with ages ranging from forty to fifty-three years old.

RESULTS

The use of confirmatory factor analysis according to gender supported both factor models of the FQ, with only minor differences in comparison to the original study performed in 2002 by Wiedemann and collegues. The internal consistency of the Spanish version of the FQ was good. Mothers displayed significantly higher levels of emotional over-involvement than fathers, while gender differences in critical comments were nonsignificant. The correlation of the two subscales of the FQ with a conceptually related measure (Expressed Emotion) and two unrelated ones (negative caregiving experience, distress) supports the convergent and concurrent validity of the instrument in both samples.

CONCLUSIONS

The FQ has adequate psychometric properties and may be of value in assessing the impact of ED symptoms on the family environment. Finally, interventions that aim to reduce Expressed Emotion in carers may consider a gender-specific approach.

Interparental Violence and Children's Long-Term Psychosocial Adjustment: The Mediating Role of Parenting Practices

The objectives of this study were: (a) to examine the direct and indirect relationships among witnessing interparental violence, parenting practices, and children's long-term psychosocial adjustment; (b) to analyze the possible gender differences in the relationships specified. The sample consisted of 1295 Spanish university students (M age = 21.21, SD = 4.04). We performed statistical analyses using structural equation modeling. The results showed that witnessing parental violence as a child is related to poor long-term psychosocial adjustment during the child's adult years. Furthermore, we found that parenting practices fully mediated the relation between witnessing interparental violence and the child's long-term adjustment. The multigroup analyses showed that most of the relations among the variables did not differ significantly by gender. However, the relation between harsh discipline and antisocial behavior was stronger for males, whereas the relation between harsh discipline and depressive symptoms was stronger for females. Finally, we discuss the implications of these findings for the clinicians and specialists who plan and develop intervention programs for populations at risk.

Development and validation of the scale of psychological abuse in intimate partner violence (EAPA-P)

BACKGROUND

In the context of intimate partner violence, psychological abuse (PA) has progressively gained scientific relevance. Even so, a greater effort is needed to define and evaluate psychological intimate partner abuse. A new exhaustive and operative taxonomy of PA strategies leads to the contribution of a new evaluation instrument.

METHOD

Participants were 101 women between 24 and 82 years old, who were abused by their partners and attended to in different municipal Catalan services, specialized in the topic.

RESULTS

The analyses have shown the suitability of a 19-item instrument divided into two factors: (1) direct PA strategies and (2) indirect PA strategies. The former includes strategies that affect the emotional, cognitive and behavioral dimension of the victim. The latter includes items that measure the amount of control and domination over the victim’s context. This scale has adequate psychometric properties in terms of score reliability and the validity of the relationship with other women’s health variables.

CONCLUSIONS

The EAPA-P, created based on a new definition and taxonomy of the forms of PA, is presented as a valid instrument to detect and measure intimate partner PA.

Are Sexist Attitudes and Gender Stereotypes Linked? A Critical Feminist Approach With a Spanish Sample

This study aims to verify the psychometric properties of the Spanish versions of the Social Roles Questionnaire (SRQ; Baber and Tucker, 2006), Modern Sexism Scale (MS), and Old-Fashioned Sexism Scale (OFS; Swim et al., 1995; Swim and Cohen, 1997). Enough support was found to maintain the original factor structure of all instruments in their Spanish version. Differences between men and women in the scores are commented on, mainly because certain sexist attitudes have been overcome with greater success in the current Spanish society, while other issues, such as distribution of power in organizational hierarchies or distribution of tasks in the household, where traditional unequal positions are still maintained. In all cases, it was found that men showed greater support for sexist attitudes. The correlations between the three instruments were as expected in assessing sexist attitudes that tend to relate to each other. Eventually, we found no empirical evidence for the postulated link between sexist attitudes and traditional gender stereotypes. Our results call for the validity and effectiveness of the classic theories of gender psychology, such as gender schema theories (Bem, 1981; Markus et al., 1982) and the notion of a gender belief system (Deaux and Kite, 1987; Kite, 2001).

Group Psychological Abuse and Psychopathological Symptoms: The Mediating Role of Psychological Stress

In the context of the long-term effects of psychological abuse, this study examined psychological stress and psychopathological symptoms in survivors of groups with cultic dynamics where abusive behaviors take place on an ongoing basis. We specifically tested the mediating role of psychological stress suffered after the departure from the group between the group psychological abuse experienced and current psychopathology. An online questionnaire was administered to 608 Spanish-speaking former members of different groups. We distributed participants into a sample of victims (N = 365) and a sample of nonvictims (N = 243), according to whether or not they reported having experienced group psychological abuse. Moderate associations were found among group psychological abuse, psychological stress, and psychopathological symptoms. Greater differences in psychological stress intensity between samples were related to personal conflicts (ηp2 = .30) and social relations (ηp2 = .29). Greater differences in psychopathological symptoms were related to paranoid ideation (ηp2 = .17), psychoticism (ηp2 = .15), depression (ηp2 = .15), and interpersonal sensitivity (ηp2 = .13). Moreover, mediation testing demonstrated that psychological stress partially mediated the impact of group psychological abuse on psychopathological symptoms. These findings contribute to a better understanding of the long-term effects of group psychological abuse. Survivors of abusive groups not only need help in dealing with psychopathological symptoms, but also need resources to cope with stressful environmental demands. Interventions should address both psychological stress and clinical symptoms to promote survivors' health and well-being during their integration process into the outgroup society.

Psychometric properties of the Spanish version of the Experience of Caregiving Inventory (ECI) among caregivers of individuals with an eating disorder

PURPOSE

The aim of this study was to examine the psychometric properties of the Spanish version of the Experience of Caregiving Inventory (ECI-S), which is designed to assess the caregiver's appraisal of the impact of caring for a relative with a serious mental illness.

METHODS

A cross-sectional study was conducted among 320 caregivers of a relative with an eating disorder to examine: (a) descriptive statistics; (b) internal consistency reliability; (c) the fit of the original ten-factor structure of the ECI through exploratory factor analysis, using a semi-confirmatory approach, for each subscale individually, and (d) concurrent validity. A total of 307 caregivers completed the scale.

RESULTS

Reliability of the ECI subscales scores was acceptable (α = 0.63-0.89). Results replicated the original ten-factor structure of the instrument. The concurrent validity was supported by correlations of the ECI-negative subscale with psychological distress (GHQ-12, 0.43), and with depression and anxiety (HADS, 0.48 and 0.49, respectively).

CONCLUSIONS

The Spanish version of the ECI (ECI-S) demonstrated good psychometric properties in terms of validity and reliability that were similar to the original version. It is an acceptable and valid instrument for assessing the impact on family members of caring for a relative with an eating disorder and can be recommended for use in clinical settings in Spain.

LEVEL OF EVIDENCE

Level V, cross-sectional descriptive study.

Corporal punishment and long-term behavior problems: the moderating role of positive parenting and psychological aggression

The aims of this study were: (a) to examine the prevalence of corporal punishment (CP) of children in Spain; (b) to analyze the extent to which CP is used in combination with psychological aggression and positive parenting among Spanish parents; and (c) to investigate whether the relation between CP and behavior problems is moderated by a positive parenting context in which CP may be used, and by the co-occurrence of psychological aggression. The sample comprised 1,071 Spanish university students (74.8% female; 25.2% male). Findings indicate a high prevalence of CP of Spanish students, revealing that significantly more mothers than fathers used CP. Furthermore, more CP is related to more use of psychological aggression and less of positive parenting. Regression analyses revealed that CP was associated with an increased probability of antisocial traits and behaviors regardless of whether there was positive parenting and psychological aggression. These results highlight that, though many Spanish parents use CP as a disciplinary strategy, it appears to be related to negative outcomes for children regardless the parental context in which it is used.

[Psychometric properties of the Spanish version of the Dimensions of Discipline Inventory (DDI) in university students]

Psychometric properties of the Spanish version of the Dimensions of Discipline Inventory (DDI) in university students. Discipline is a central aspect of parenting that includes the behaviors that parents use to correct children's misbehavior or to achieve their compliance. The aim of this study was to analyze the psychometric properties of the Dimensions of Discipline Inventory (DDI), a multidimensional instrument to measure parental discipline, in a sample of 1097 Spanish university students. Results support the 9-factor structure originally proposed by the DDI authors, clustered in four second-order scales. In order to analyze the convergent validity, the relationship between the types of parental discipline and the presence of physical abuse in childhood were examined. Lastly, practical applications of the DDI were discussed and it was concluded that this instrument is a useful tool to assess the disciplinary techniques used by parents.