Validating psychosocial pathways of risk between neuroticism and late life depression using a polygenic score approach

Association of polygenic scores for depression and neuroticism with perceived stress in daily life during a long-lasting stress period

Genetic factors contribute significantly to interindividual differences in the susceptibility to stress-related disorders. As stress can also be conceptualized as environmental exposure, controlled gene-environment interaction (GxE) studies with an in-depth phenotyping may help to unravel mechanisms underlying the interplay between genetic factors and stress. In a prospective-longitudinal quasi-experimental study, we investigated whether polygenic scores (PGS) for depression (DEP-PGS) and neuroticism (NEU-PGS), respectively, were associated with responses to chronic stress in daily life. We examined law students (n = 432) over 13 months. Participants in the stress group experienced a long-lasting stress phase, namely the preparation for the first state examination for law students. The control group consisted of law students without particular stress exposure. In the present manuscript, we analyzed perceived stress levels assessed at high frequency and in an ecologically valid manner by ambulatory assessments as well as depression symptoms and two parameters of the cortisol awakening response. The latter was only assessed in a subsample (n = 196). No associations between the DEP-PGS and stress-related variables were found. However, for the NEU-PGS we found a significant GxE effect. Only in individuals experiencing academic stress a higher PGS for neuroticism predicted stronger increases of perceived stress levels until the exam. At baseline, a higher NEU-PGS was associated with higher perceived stress levels in both groups. Despite the small sample size, we provide preliminary evidence that the genetic disposition for neuroticism is associated with stress level increases in daily life during a long-lasting stress period.

Neuroticism is associated with increase in depression symptoms over time in older adults with type 2 diabetes

OBJECTIVES

The likelihood of depression symptoms in those with type 2 diabetes (T2D) is high. Psychological risk factors enhancing comorbidity of depression symptoms in T2D are yet to be determined. The present study examines the cross-sectional and longitudinal relationship between personality traits and distinct depression dimensions in older adults with T2D.

METHODS

Participants were older adults (age ≥65yeas) with T2D from the Israel Diabetes and Cognitive Decline (IDCD) study (N = 356), with complete data on depression [Geriatric Depression Scale (GDS) - 15 item version] and its dimensions- namely, dysphoric mood, apathy, hopelessness, memory complains and anxiety, and on personality [Big Five Inventory (BFI)]. Logistic and mixed linear regression models examined cross-sectional and longitudinal associations while adjusting for socio-demographics, cognition, cardiovascular and diabetes-related factors.

RESULTS

Cross-sectionally, high neuroticism was associated with high scores in total GDS and in all depression-dimensions, except memory complaints. Higher extroversion was associated with lower total GDS and with lower scores on all depression dimensions, except anxiety. High levels of neuroticism were associated with increase in total number of depression symptoms over time.

CONCLUSIONS

In older adults with T2D, neuroticism and extroversion are associated with most depression dimensions suggesting that these traits relate to a global depression symptomatology rather than to any specific dimension or phenomenology. High neuroticism was associated with increase in depression symptoms over time, highlighting its role in the development of depression symptoms in older adults with T2D.

The shattered "Iron Rice Bowl": effects of Chinese state-owned enterprise reform on depressive symptoms in later life

OBJECTIVES

The SOE reform was the first time that economic insecurity was introduced since 1949 in China, with hundreds of million employees affected by the laid off. This study took the State-Owned Enterprises (SOE) reform in China as a natural experiment to explore the impact of economic insecurity on depressive symptoms in later life.

METHODS

Data were obtained from the China Health and Retirement Longitudinal Survey (CHARLS), 2014 and 2015. CHARLS is a nationally representative survey covering 28 provinces in China. CHARLS used the probabilities proportional to size (PPS) sampling method and involved 450 villages/resident committees, 150 counties/districts and 12,400 households. A total of 5113 urban dwellers born earlier than 1971 (aged 25 years old and above at the start of the SOE reform, 1995) were involved. Using the province-level  economic loss from the layoffs, we examined the impact of economic insecurity exposure on the score of depressive symptoms using a difference-in-differences model (DID).

RESULTS

Individuals with economic insecurity exposure had a significantly increased risk of higher depressive symptoms scores, in which a 1 percentage point increase in expected economic loss would increase the CESD-10 score by 0.10. For an individual at the median distribution (CESD-10 = 5), this implies a shift to the 58th percentile (CESD-10 = 6). Given that the average intensity of expected economic loss is 10.22% and the mean CESD-10 is 6.92, exposure to the SOE reform led to an average increase in the CESD-10 score by 1.02 and by at least 14.74%. The heterogeneity analyses showed that the role of SOE reform in depressive symptoms scores was robust in both female and male groups and groups with different educational attainment.

CONCLUSIONS

Economic insecurity exposure increased the depressive symptoms score later in life in the context of China. Programs, such as adequate unemployment insurance benefits, can protect individuals against the risk of financial loss, thereby reducing their negative impact on depressive symptoms. Providing mental symptoms surveillance and psychological counseling to those experienced at a time of great uncertainty is important for preventing depression in times of economic insecurity.

Associations Between Personality Traits, Perceived Stress and Depressive Symptoms in Gynecological Cancer Patients Characterized by the Short and Long Allele Variant of the 5-HTTLPR Genotype: Preliminary Results

Objective

The study explored associations between personality traits, perceived stress and symptoms of depression in oncological patients characterized by the two variants of the serotonin transporter (5-HTTLPR) polymorphisms.

Method

The sample was composed of 41 gynecological cancer patients who completed self-reported questionnaires including the NEO Five-Factor Inventory, the dimension of depression-dejection (D/D) of the Profile of Moods State and the Perceived Stress Scale (PSS). The polymerase chain reaction was also employed to identify genotypes in the serotonin (5HTT) polymorphism.

Results

The one-way ANOVA test, across the 5-HTTLPR genotype groups, showed significant effects of the short variants on neuroticism (p=0.009) and of the long variant on agreeableness (p=0.022), as well as a tendency to a statistical significance of the l/l variant on consciousness (p=0.074). Bivariate correlations showed positive correlations of neuroticism with both psychopathological symptoms (D/D r=0.522; PSS r=0.586) in the combined group S, negative association of agreeableness with depression (D/D r=-0.613) and of consciousness with depression (D/D r=-0.750) and perceived stress (PSS r=-0.702) in the group of the long variant of 5-HT-TLPR genotype.

Conclusions

Personalized medicine should consider the interaction between genotype and phenotype in reducing levels of clinical psychological distress, highlighting how psychotherapeutic processes should improve patients' quality of life.

Stressful Life Events and Chinese Older People Depression: Moderating Role of Social Support

Aim: This study analyzes the effects of retrospective stressful life events on current depression among Chinese older people and how these effects are moderated by social support. Stressful life events comprise bereavement, divorce, health adversities, accidents, and financial losses due to fraud.

Data and Method: Data were drawn from the China Health and Retirement Longitudinal Study (CHARLS) of the 2015 panel, and responses from 9,619 older people aged over 60 years were used. The least-squares regression method was applied to measure the linear effects. Propensity score matching minimized selection bias and enabled the measurement of the net effects of stressful life events. The bias-corrected matching estimator was also used to correct the inexact matching bias from propensity score matching.

Result: Experienced stressful life events and exposure to cumulative stressful life events were found to lead to depression in older people. When older people experienced stressful life events but with more social activities, and higher satisfaction and frequent contact with children, their depressive levels were lower. The results of the propensity score matching showed that stressful life events resulted in depression in older people. Furthermore, individuals with family support were able to moderate stressful life events effects; however, the moderating effects of social activity separately were negligible. In sum, with the moderating role of family support and social activity, the average differences in older people depression caused by stressful life events decreased.

Conclusion: Experiencing stressful life events is detrimental to the psychological health of the older people. Social support, including family support and social activity, has buffered detrimental effects on depression caused by stressful life events.

Interpretations: The study underscores the need to supply effective interventions for the older people who experienced stressful life events. First, society should improve the capability of community care centers to supply mental health services. Second, family members should pay attention to mental condition of older people, and specific support should concord with the needs of Chinese older people. In addition, support suppliers can move from being confined to kinship relationships to close relationships, such as the community partners and neighbors.

Impairments of Social Interaction in Depressive Disorder

OBJECTIVE

Despite the numerous findings on the altered emotion recognition and dysfunctional social interaction behavior of depressive patients, a lot of the relationships are not clearly clarified.

METHODS

In this pilot study, 20 depressive patients (mean±SD, 38.4±14.2) and 20 healthy subjects (mean±SD, 38.9±15.3) (each in dyads) were videographed. We then analyzed their social interaction behavior and emotion processing in terms of emotion recognition, their own emotional experience, and the expression of emotions under the conditions of a semi-structured experimental paradigm.

RESULTS

Patients showed more significant impairment regarding the dimensions of social interaction behavior (i.e., attention, interest, and activity) and their interaction behavior was characterized by neutral affectivity, silence, and avoidance of direct eye contact. This interactive behavioral style was statistically related to depressive psychopathology. There were no differences concerning emotion recognition.

CONCLUSION

Impairments of non-verbal and verbal social interaction behavior of depressive patients seem to be less associated with disturbances of basic skills of emotion recognition.

The short- and long-term effects of the Great Recession on late-life depression in Europe: The role of area deprivation

INTRODUCTION

The prevalence of depression increases in times of economic crises. Less is known about whether people living in advantaged or disadvantaged areas suffer equally from negative effects of crisis.

OBJECTIVE

To explore the role of area deprivation on the short- and long-term effects of the Great Recession in Europe on late-life depression.

METHODS

Individual panel data from Austria, Belgium, Denmark, France, Germany, Italy, Spain, Sweden, Switzerland of the SHARE (age 50+, n = 6866) between 2004 and 2017 were used. Late-life depression (LLD) was measured by the EURO-D scale (4+ symptoms). Area deprivation was assessed by a country-specific z-standardized scale measuring perceived access to various services and quality of the social and built environment. Quarterly country-level GDP and yearly unemployment data were explored to define country-specific durations of the Great Recession. Individual fixed effects panel regressions were estimated controlling for time-varying socioeconomic and health-related confounders.

RESULTS

Prevalence and incidence of late-life depression was generally higher in deprived than in non-deprived areas, and these differences in prevalence and incidence increased during the Great Recession. Regressions showed that the Great Recession was related to a 23% higher long-term risk of late-life depression (OR: 1.23, CI: 1.05-1.44) for all study participants. In the short-term of the Great Recession, people from deprived areas had a 22% higher risk of late-life depression (OR: 1.22, CI: 1.02-1.46) than people from non-deprived areas.

CONCLUSION

The findings suggest that older adults exposed to adverse area determinants suffer more from the negative short-term effects of a severe economic crisis on depression and mental health inequalities may have increased between people living in deprived versus non-deprived areas. This potential increase in mental health inequalities warrants particular attention for those people living in deprived areas.

Identifying risk factors involved in the common versus specific liabilities to substance use: A genetically informed approach

Individuals most often use several rather than one substance among alcohol, cigarettes or cannabis. This widespread co-occurring use of multiple substances is thought to stem from a common liability that is partly genetic in origin. Genetic risk may indirectly contribute to a common liability to substance use through genetically influenced mental health vulnerabilities and individual traits. To test this possibility, we used polygenic scores indexing mental health and individual traits and examined their association with the common versus specific liabilities to substance use. We used data from the Avon Longitudinal Study of Parents and Children (N = 4218) and applied trait-state-occasion models to delineate the common and substance-specific factors based on four classes of substances (alcohol, cigarettes, cannabis and other illicit substances) assessed over time (ages 17, 20 and 22). We generated 18 polygenic scores indexing genetically influenced mental health vulnerabilities and individual traits. In multivariable regression, we then tested the independent contribution of selected polygenic scores to the common and substance-specific factors. Our results implicated several genetically influenced traits and vulnerabilities in the common liability to substance use, most notably risk taking (bstandardised = 0.14; 95% confidence interval [CI] [0.10, 0.17]), followed by extraversion (bstandardised = -0.10; 95% CI [-0.13, -0.06]), and schizophrenia risk (bstandardised = 0.06; 95% CI [0.02, 0.09]). Educational attainment (EA) and body mass index (BMI) had opposite effects on substance-specific liabilities such as cigarette use (bstandardised-EA = -0.15; 95% CI [-0.19, -0.12]; bstandardised-BMI = 0.05; 95% CI [0.02, 0.09]) and alcohol use (bstandardised-EA = 0.07; 95% CI [0.03, 0.11]; bstandardised-BMI = -0.06; 95% CI [-0.10, -0.02]). These findings point towards largely distinct sets of genetic influences on the common versus specific liabilities.

Structural brain changes and neuroticism in late-life depression: a neural basis for depression subtypes

The neurobiological basis of neuroticism in late-life depression (LLD) is understudied. We hypothesized that older depressed subjects scoring high in measures of neuroticism would have smaller hippocampal and prefrontal volumes compared with non-neurotic older depressed subjects and with nondepressed comparison subjects based on previous research. Non-demented subjects were recruited and were either depressed with high neuroticism (n = 65), depressed with low neuroticism (n = 36), or never depressed (n = 27). For imaging outcomes focused on volumetric analyses, we found no significant between-group differences in hippocampal volume. However, we found several frontal lobe regions for which depressed subjects with high neuroticism scores had smaller volumes compared with non-neurotic older depressed subjects and with nondepressed comparison subjects, controlling for age and gender. These regions included the frontal pole, medial orbitofrontal cortex, and left pars orbitalis. In addition, we found that non-neurotic depressed subjects had a higher volume of non-white matter hypointensities on T1-weighted images (possibly related to cerebrovascular disease) than did neurotic depressed subjects. Our finding that depressed subjects low in neuroticism had higher volumes of non-white matter hypointensities is consistent with prior literature on "vascular depression." In contrast, the finding that those high in neuroticism had smaller frontal volume than depressed subjects low in neuroticism and never-depressed subjects highlight the importance of frontal circuitry in the subgroup of older depressed individuals with comorbid neuroticism. Together, these results implicate different neural mechanisms in older neurotic and non-neurotic depressed groups and suggest that multiple biological pathologies may lead to different clinical expressions of LLD.

The impact of parenting a child with serious mental illness: Accounting for the parent's genetic vulnerability to mental illness

Parents of adults with serious mental illness (SMI) often are primary caregivers for their affected relative. Prior work has suggested that the toll of caregiving is associated with poorer well-being in family caregivers, particularly parents of affected adults. However, due to methodological limitations, it has not been possible to assess these family caregivers' own genetic vulnerability to mental and physical health problems, and thus the impact of caregivers' genetic risk on well-being may not have been accounted for. With the addition of genetic data to large survey samples, family caregivers' genetic vulnerability to mental and physical health problems can now be estimated. Parents from the Wisconsin Longitudinal Study who have an adult child with an SMI (n = 265) and a comparison group of parents with a child without disabilities (n = 5,036) reported their psychological well-being and mental and physical health across 4 measures. Genetic vulnerability was assessed using polygenic risk scores of neuroticism, bipolar disorder, schizophrenia, and depression. Results indicate that the effect of having a child with an SMI still had significant effects for all 4 parental health outcomes even after controlling for these measures of genetic vulnerability. This study's results affirm the negative health impact of parenting a child with SMI, above and beyond genetic vulnerability. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Polygenic Scores for ADHD: A Meta-Analysis

Attention-deficit/hyperactivity disorder (ADHD) is a highly heritable neurodevelopmental disorder that is known to have a polygenic (i.e., many genes of individually small effects) architecture. Polygenic scores (PGS), which characterize this polygenicity as a single score for a given individual, are considered the state-of-the-art in psychiatric genetics research. Despite the proliferation of ADHD studies adopting this approach and its clinical implications, remarkably little is known about the predictive utility of PGS in ADHD research to date, given that there have not yet been any systematic or meta-analytic reviews of this rapidly developing literature. We meta-analyzed 12 unique effect sizes from ADHD PGS studies, yielding an N = 40,088. These studies, which included a mixture of large population-based cohorts and case-control samples of predominantly European ancestry, yielded a pooled ADHD PGS effect size of r_random = 0.201 (95% CI = [0.144, 0.288]) and an r_fixed = 0.190 (95% CI = [0.180, 0.199]) in predicting ADHD. In other words, ADHD PGS reliably account for between 3.6% (in the fixed effects model) to 4.0% (in the random effects model) of the variance in broadly defined phenotypic ADHD. Findings provide important insights into the genetics of psychiatric outcomes and raise several key questions about the impact of PGS on psychiatric research moving forward. Our review concludes by providing recommendations for future research directions in the use of PGS, including new methods to account for comorbidities, integrating bioinformatics to elucidate biological pathways, and leveraging PGS to test mechanistic models of ADHD.

A Correlative Study Between Personality Traits and the Preference of Site Selection in Cosmetic Treatment

Background: Cosmetic treatment was closely associated with beauty seekers' psychological well-being. Patients who seek cosmetic surgery often show anxiety. Nevertheless, not much is known regarding how personality traits relate to the selection of body parts that receive cosmetic treatment. Aims: This study aims to investigate the correlation between personality traits and various selection sites for cosmetic treatment via Eysenck Personality Questionnaire (EPQ). Methods: A cross-sectional approach was adopted to randomly recruited patients from a general hospital planning to undergo cosmetic treatments. All respondents completed the EPQ and provided their demographic information. The EPQ involves four scales: the extraversion (E), neuroticism (N), psychoticism (P), and lying scales (L). Psychological scales were evaluated to verify that people who selected different body sites for cosmetic intervention possessed different personality portraits. Results: A total of 426 patients with an average age of 32.14 ± 8.06 were enrolled. Among them, 384 were females, accounting for more than 90% of patients. Five treatment sites were analyzed, including the body, eye, face contour, nose, and skin. Comparatively, patients with neuroticism were more likely to undergo and demand rhinoplasty (OR 1.15, 95% CI 1.07-1.24, P < 0.001). Face contour treatment was commonly associated with extraversion (OR 1.05, 95% CI 1.00-1.11, P = 0.044), psychoticism (OR 1.13, CI 1.03-1.25, P = 0.013), and neuroticism (OR 1.05, CI 1.01-1.10, P = 0.019). Conclusions: This novel study attempted to determine the personality profiles of beauty seekers. The corresponding assessments may provide references for clinical treatment options and enhance postoperative satisfaction for both practitioners and patients.

Dispositional negativity, cognition, and anxiety disorders: An integrative translational neuroscience framework

When extreme, anxiety can become debilitating. Anxiety disorders, which often first emerge early in development, are common and challenging to treat, yet the underlying mechanisms have only recently begun to come into focus. Here, we review new insights into the nature and biological bases of dispositional negativity, a fundamental dimension of childhood temperament and adult personality and a prominent risk factor for the development of pediatric and adult anxiety disorders. Converging lines of epidemiological, neurobiological, and mechanistic evidence suggest that dispositional negativity increases the likelihood of psychopathology via specific neurocognitive mechanisms, including attentional biases to threat and deficits in executive control. Collectively, these observations provide an integrative translational framework for understanding the development and maintenance of anxiety disorders in adults and youth and set the stage for developing improved intervention strategies.