Genetic correlations between suicide attempts and psychiatric and intermediate phenotypes adjusting for mental disorders.

BACKGROUND: Suicide attempts are a moderately heritable trait, and genetic correlations with psychiatric and related intermediate phenotypes have been reported. However, as several mental disorders as well as major depressive disorder (MDD) are strongly associated with suicide attempts, these genetic correlations could be mediated by psychiatric disorders. Here, we investigated genetic correlations of suicide attempts with psychiatric and related intermediate phenotypes, with and without adjusting for mental disorders. METHODS: To investigate the genetic correlations, we utilized large-scale genome-wide association study summary statistics for suicide attempts (with and without adjusting for mental disorders), nine psychiatric disorders, and 15 intermediate phenotypes. RESULTS: Without adjusting for mental disorders, suicide attempts had significant positive genetic correlations with risks of attention-deficit/hyperactivity disorder, schizophrenia, bipolar disorder, MDD, anxiety disorders and posttraumatic stress disorder; higher risk tolerance; earlier age at first sexual intercourse, at first birth and at menopause; higher parity; lower childhood IQ, educational attainment and cognitive ability; and lower smoking cessation. After adjusting for mental disorders, suicide attempts had significant positive genetic correlations with the risk of MDD; earlier age at first sexual intercourse, at first birth and at menopause; and lower educational attainment. After adjusting for mental disorders, most of the genetic correlations with psychiatric disorders were decreased, while several genetic correlations with intermediate phenotypes were increased. CONCLUSIONS: These findings highlight the importance of considering mental disorders in the analysis of genetic correlations related to suicide attempts and suggest that susceptibility to MDD, reproductive behaviors, and lower educational levels share a genetic basis with suicide attempts after adjusting for mental disorders.

Causal associations between female reproductive behaviors and psychiatric disorders: a lifecourse Mendelian randomization study.

BACKGROUND: The timings of reproductive life events have been examined to be associated with various psychiatric disorders. However, studies have not considered the causal pathways from reproductive behaviors to different psychiatric disorders. This study aimed to investigate the nature of the relationships between five reproductive behaviors and twelve psychiatric disorders. METHODS: Firstly, we calculated genetic correlations between reproductive factors and psychiatric disorders. Then two-sample Mendelian randomization (MR) was conducted to estimate the causal associations among five reproductive behaviors, and these reproductive behaviors on twelve psychiatric disorders, using genome-wide association study (GWAS) summary data from genetic consortia. Multivariable MR was then applied to evaluate the direct effect of reproductive behaviors on these psychiatric disorders whilst accounting for other reproductive factors at different life periods. RESULTS: Univariable MR analyses provide evidence that age at menarche, age at first sexual intercourse and age at first birth have effects on one (depression), seven (anxiety disorder, ADHD, bipolar disorder, bipolar disorder II, depression, PTSD and schizophrenia) and three psychiatric disorders (ADHD, depression and PTSD) (based on p<7.14×10-4), respectively. However, after performing multivariable MR, only age at first sexual intercourse has direct effects on five psychiatric disorders (Depression, Attention deficit or hyperactivity disorder, Bipolar disorder, Posttraumatic stress disorder and schizophrenia) when accounting for other reproductive behaviors with significant effects in univariable analyses. CONCLUSION: Our findings suggest that reproductive behaviors predominantly exert their detrimental effects on psychiatric disorders and age at first sexual intercourse has direct effects on psychiatric disorders.

The impact of the COVID-19 pandemic on contraceptive methods, abortion, and unintended pregnancy: a cross-sectional study.

BACKGROUND AND AIM: By creating an international emergency, the COVID-19 pandemic may have led to compromised reproductive health care, including family planning services, and thus increased unintended pregnancies and unsafe abortions. This study was conducted to compare methods of contraception, abortion, and unintended pregnancies in those served by the health centers of Babol city in Iran, both before and during the COVID-19 pandemic. METHODS: A cross-sectional study was conducted including 425 participants registered to the health centers of Babol city, Mazandaran province, Iran. Using a multi-stage method, 6 urban health centers and 10 rural centers were selected for inclusion. Proportional allocation method was used for sampling those who met the inclusion criteria. A questionnaire was used to collect data in relation to individual characteristics and reproductive behaviors via 6 questions focused upon methods and preparation of contraception, number and type of abortions, and number and causes of unintended pregnancy from July to November 2021. The data were analyzed using SPSS software version 26. Significance level was considered to be p < 0.05 in all tests. RESULTS: Most participants aged between 20 and 29 years old had a diploma level of education, were housewives and lived in the city. Prior to the pandemic, 32.0% used modern contraceptive methods and 31.6% used these during the pandemic. No change in the combination of contraceptive methods used was observed between these two periods. Approximately two-thirds used the withdrawal method in both periods. The majority of participants in both periods purchased their contraceptives from a pharmacy. Unintended pregnancy increased from 20.4% prior to the pandemic to 25.4% during the pandemic. Abortions increased from 19.1% prior to the pandemic to 20.9% during the pandemic, although these findings were not found to be statistically significant. Contraceptive methods had a statistically significant relationship with age, education, spouse's education, spouse's occupation, and place of residence. The number of unintended pregnancies had a significant relationship with age, the educational level of both participants and their spouses and socio-economic status, and the number of abortions had a statistically significant relationship with the age and education level of the spouse (p > 0.05). CONCLUSION: Despite there being no change in contraceptive methods compared to the pre-pandemic period, an increase in the number of unintended pregnancies, abortions and illegal abortions was observed. This may be indicative of an unmet need for family planning services during the COVID-19 pandemic.

Comparing reproductive intentions before and during the COVID-19 pandemic: a cross-sectional study.

BACKGROUND AND AIM: Reproductive behaviors and intentions are affected by several factors, including the COVID-19 pandemic crisis. This study was conducted with the aim of comparing the intention to reproduce and its causes in Iran during the period prior to and during the COVID-19 pandemic. METHODS: This descriptive-comparative study included 425 cisgender women from 6 urban health centers and 10 rural centers in Babol city, Mazandaran province, Iran. Urban and rural health centers were selected using a multi-stage approach with proportional allocation. A questionnaire was used to collect data in relation to individual characteristics and reproductive intentions. RESULTS: Most participants aged between 20 and 29 years had a diploma level of education, were housewives and lived in the city. The intention to reproduce decreased from 11.4% before the pandemic to 5.4% during the pandemic (p = 0.006). The most common reason for wanting to have children prior to the pandemic was not having children (54.2%). During the pandemic, a desire to reach the ideal number of children was the most common reason to want to have children (59.1%), though no statistically significant difference was observed between the two periods (p = 0.303). The most common reason for not wanting to have children in both periods was having enough children already (45.2% before and 40.9% during the pandemic). The reasons for not wanting to have children had a statistically significant difference between the two periods (p < 0.001). Reproductive intentions had a statistically significant relationship with the variables of age (p < 0.001), the education level of both participants (p < 0.001) and spouses (p = 0.006), occupation (p = 0.004), and socio-economic status (p < 0.001). CONCLUSION: Despite restrictions and lockdowns, the COVID-19 pandemic had a negative impact on people's desire to reproduce in this context. Economic problems caused by the sanctions which increased during the COVID-19 crisis may be one of the reasons for a reduction in people's intentions to become parents. Future research could usefully investigate whether this decrease in the desire to reproduce will lead to significant changes in population level and future birth rates.

Menstrual and Reproductive Factors in Association With Breast Cancer Risk in Vietnamese Women: A Case-Control Study.

OBJECTIVES: Though menstrual and reproductive factors have been associated with the risk of breast cancer in many populations, very few studies have been conducted among Vietnamese women. This study aimed to assess the association between menstrual and reproductive factors and the risk of breast cancer in Vietnamese women. METHODS: A retrospective case-control study of 490 breast cancer cases and 468 controls was conducted in Northern Vietnam. Unconditional logistic regression models adjusting for confounders were used to estimate odds ratios (ORs) and their 95% confidence intervals (CIs) for the associations of menstrual and reproductive factors with the risk of breast cancer; overall and by cancer subtype. RESULTS: Among breast cancer patients, the luminal B subtype was the most frequent (48.6%), followed by HER2-overexpressing (24.5%), luminal A (16.7%), and triple-negative breast cancer (TNBC; 10.2%). Among menopausal women, menopausal age at 50 years or older (OR = 1.71, 95% CI: 1.15-2.57 vs. <50 y) was associated with an increased risk of breast cancer. Earlier age at menarche (<13 y) was associated with a significantly increased risk of breast cancer (OR = 2.66, 95% CI: 1.08-7.51) among premenopausal women only and the luminal A subtype of breast cancer (OR = 3.06, 95% CI: 1.04-8.16). Having more than two children was associated with a reduced risk of premenopausal (OR = .42, 95%CI: .21-.83), luminal B (OR = .43, 95% CI: .24-.79), and TNBC (OR = .34, 95% CI: .14-.89). Later menopause was positively associated with the risk of breast cancer with HER2 overexpression (OR = 2.19, 95% CI: 1.14-4.23). CONCLUSION: Associations of menstrual and reproductive factors with breast cancer among Vietnamese women, particularly for among premenopausal women and for the luminal A subtype, are generally consistent with those reported from other countries. These findings suggest that changes in menstrual and reproductive patterns among young Vietnamese women may contribute to the recent rising incidence of breast cancer in Vietnam.

Medial Amygdala Arginine Vasopressin Neurons Regulate Innate Aversion to Cat Odors in Male Mice.

Aversion to environmental cues of predators is an integral part of defensive behaviors in many prey animals. It enhances their survival and probability of future reproduction. At the same time, animals cannot be maximally defended because imperatives of defense usually trade-off with behaviors required for sexual reproduction like display of dominance and production of sexual pheromones. Here, we approach this trade-off through the lens of arginine vasopressin (AVP) neurons within the posterodorsal medial amygdala (MePD) of mice. This neuronal population is known to be involved in sexual behaviors like approach to sexually salient cues. We show that chemogenetic partial ablation of this neuronal population increases aversion to predator odors. Moreover, overexpression of AVP within this population is sufficient to reduce aversion to predator odors. The loss of fear of the predator odor occurs in parallel with increased recruitment of AVP neurons within the MePD. These observations suggest that AVP neurons in the medial aspect of the extended amygdala are a proximate locus for the reduction in innate fear during life stages dominated by reproductive efforts.

Explanatory Model of Voluntary Childlessness among Iranian Couples in Tehran: A Grounded Theory Approach.

BACKGROUND: Global and Iranian statistics indicate a rise in the newly emerging phenomenon of voluntary childlessness as a permanent status among couples. Childlessness is one of the main challenges of modern society. In Iran, studies on the process of voluntary permanent childlessness are scarce. The present study aimed to investigate the causes and underlying factors of voluntary childlessness and to provide an explanatory model of this phenomenon among Iranian couples. METHODS: The present qualitative study was conducted using the grounded theory approach proposed by Strauss and Corbin. Married couples from Tehran (Iran) with no infertility problems who chose to be permanently childless were invited to take part in this research. Theoretical saturation was reached after 33 semi-structured in-depth interviews. RESULTS: Based on the results, the causal conditions of childlessness included the high-risk society and adverse experiences. Contextual and intervening conditions included social problems, social support, transitional society, natural resources, social presence of women, and marriage age. The strategies and interactions observed in childless couples included the suppression of feelings, conflicts, rationality, and malingering. The core phenomenon was individualism. CONCLUSION: Increased social problems and reduced social support endanger a society in transition toward modernity. Individualists resort to permanent childlessness by suppressing parental feelings, overcoming doubts about childbearing, and becoming nonchalant by running away from child-rearing responsibilities. Such people may resort to child adoption or to have pets in order to cope with loneliness.

Regulation of sensory motor circuits used in C. elegans male intromission behavior.

Intromission of a male's copulatory organ into his mate's genital orifice is a behavioral step that is conserved in most terrestrial mating behaviors. The behavior serves to anchor the male to his mate and aids in the transmission of the male's gametes into the female. In all animals, the successful execution of intromission likely involves coordinated sensory/motor regulation coupled with constant self-monitoring. The compact male C. elegans reproductive nervous system provides an accessible experimental model for identification and dissection of the molecular and cellular circuit components that promote different motor outputs required for the transfer of the male's genetic material into the self-fertilizing hermaphrodite. The C. elegans male tail contains forty-one sex-specific muscles and 81 sex-specific neurons, which promote different steps of mating behavior. In this review, I will outline the functional contributions of the male-specific sensory-motor neurons and their postsynaptic muscles that control the motions of the male copulatory spicules during the various phases of intromission behavior and ejaculation. In addition, I will summarize the roles of neurotransmitter receptors and ion channels that regulate the outputs of individual circuit components and describe how the intromission circuit uses these molecules to regulate reproductive behavior during male aging and nutritional deprivation.

Reproductive function and behaviors: an update on the role of neural estrogen receptors alpha and beta.

Infertility is becoming a major public health problem, with increasing frequency due to medical, environmental and societal causes. The increasingly late age of childbearing, growing exposure to endocrine disruptors and other reprotoxic products, and increasing number of medical reproductive dysfunctions (endometriosis, polycystic ovary syndrome, etc.) are among the most common causes. Fertility relies on fine-tuned control of both neuroendocrine function and reproductive behaviors, those are critically regulated by sex steroid hormones. Testosterone and estradiol exert organizational and activational effects throughout life to establish and activate the neural circuits underlying reproductive function. This regulation is mediated through estrogen receptors (ERs) and androgen receptor (AR). Estradiol acts mainly via nuclear estrogen receptors ERα and ERß. The aim of this review is to summarize the genetic studies that have been undertaken to comprehend the specific contribution of ERα and ERß in the neural circuits underlying the regulation of the hypothalamic-pituitary-gonadal axis and the expression of reproductive behaviors, including sexual and parental behavior. Particular emphasis will be placed on the neural role of these receptors and the underlying sex differences.

Age at first sexual intercourse, age at menarche, and age at menopause: a mendelian randomization study on lung cancer risk.

Background: There is increasing evidence that sex hormones are involved in the development of lung cancer, but the correlation between the reproductive behavior that changes sex hormone levels and lung cancer is not yet clear. Many previous studies have investigated the association between reproductive factors and lung cancer risk, but the results have been inconsistent. Therefore, we conducted a two-sample Mendelian randomization (MR) analysis to explore the potential relationship between age at first sexual intercourse (AFS), age at menarche, and age at menopause, and lung cancer. Methods: We performed a MR analysis of the data from the genome-wide association study (GWAS) of European ancestry to evaluate the independent effects of three reproductive behaviors on lung cancer overall (LUCA), lung adenocarcinoma (LUAD), lung squamous cell carcinoma (LUSC), and small cell lung cancer (SCLC). We mainly used the inverse-variance weighting method for the MR analysis. Sensitivity was determined by a MR-pleiotropy residual sum and outlier analysis, a weighted median analysis, a MR-Egger analysis, and a leave-one-out analysis. Results: The MR analysis results revealed that older AFS had a causal relationship with LUCA [odds ratio (OR) =0.6283, 95% confidence interval (CI): 0.4959-0.7961, P=0.0001), LUAD (OR =0.7042, 95% CI: 0.4967-0.9984, P=0.049), and LUSC (OR =0.6231, 95% CI: 0.4386-0.8853, P=0.0083). Conclusions: Our results revealed a causal relationship between older AFS and a lower risk of lung cancer. Our findings emphasize the importance of providing sex education, as early sexual intercourse may have undesirable effects. In addition, early psychological treatment is also essential.

Embryonic benzophenone-3 exposure inhibited fertility in later-life female zebrafish and altered developmental morphology in offspring embryos.

Benzophenone-3 (BP3), an organic UV filter widely used in personal care products, is ubiquitous in aquatic environments. Previous studies have shown that BP3 can interfere with oocytes development in the ovary. The current study was conducted to evaluate the effects of embryonic BP3 exposure on reproductive outcomes in later life. Zebrafish embryos were exposed to different concentrations of BP3 (0, 1, 10, 100 µg/L) for 5 days in the developmental stage and subsequently fed for 4 months without any toxins. The body length, body weight, and ovary weight in F0 female adult zebrafish and morphology indices in F1 offspring embryos were measured. The reproductive behaviors of adult zebrafish were recorded by a digital camera. HE staining was used to estimate the development of oocytes and the proportion of different phases was calculated. qPCR was used to detect the expression levels of reproduction-related genes of the hypothalamic-pituitary-gonadal (HPG) axis. Our findings revealed that the body length and body weight were not changed with embryonic BP3 exposure, but BP3 exposure inhibited the development and maturation of ovaries in later-life female zebrafish, accompanied by an increased proportion of follicles in the primary growth and early vitellogenic stages, and a decline in the full-growth stage in ovaries. Meanwhile, reduced egg production, delayed hatching rate, altered somite count and increased mortality rate were observed at 100 µg/L in offspring embryos. Behavioral results showed that BP3 exposure reduced the frequency of chasing, touching, entering the spawning area, and the duration of fish entering the spawning area later in life, qPCR analysis showed that the expression levels of reproduction-related genes of the HPG axis were downregulated in females, following a decreasing trend in plasma E2 and 11-KT levels. These results suggested that embryonic BP3 exposure negatively affected the fertility of fish and the development of their offspring embryos, which may cause potential risks to aquatic ecosystems and human health.

Proximate causes and ultimate effects of common antidepressants, fluoxetine and venlafaxine, on fish behavior.

Antidepressant (AD) drugs are widely prescribed for the treatment of psychiatric disorders, including depression and anxiety disorders. The continuous use of ADs causes significant quantities of these bioactive chemicals to enter the aquatic ecosystems mainly through wastewater effluent discharge. This may result in many aquatic organisms being inadvertently affected by these drugs. Fluoxetine (FLX) and venlafaxine (VEN) are currently among the most widely detected ADs in aquatic systems. A growing body of experimental evidence demonstrates that FLX and VEN have a substantial capacity to induce neurotoxicity and cause behavioral dysfunctions in a wide range of teleost species. At the same time, these studies often report seemingly contradictory results that are confounding in nature. Hence, we clearly require comprehensive reviews that attempt to find overarching patterns and establish possible causes for these variable results. This review aims to explore the current state of knowledge regarding the neurobehavioral effects of FLX and VEN on fishes. This study also discusses the potential mechanistic linkage between the neurotoxicity of ADs and behavioral dysfunction and identifies key knowledge gaps and areas for future research.

Sex-Specific Movement Responses of Reeves's Pheasant to Human Disturbance: Importance of Body Characteristics and Reproductive Behavior.

Human disturbance has a strong impact on the movement of wild animals. However, it remains unclear how the movement patterns of the Reeves's Pheasant (Syrmaticus reevesii) respond to human disturbance in human-dominated landscapes. We tracked the movement of 40 adult individual Reeves's Pheasants during the breeding season, and used the dynamic Brownian bridge motion model and kernel density estimation to analyze the diurnal movement patterns of Reeves's Pheasants and their response to human presence. We analyzed the paths of Reeves's Pheasants based on a partial least squares path model, considering habitat conditions, body characteristics, and reproductive behaviors. We found that males had two clear diurnal movement peaks, whereas reproductive and non-reproductive females did not show such movement peaks. Males shifted their movement peaks to earlier times in the day to avoid the presence peaks of humans. The correlation between human-modified habitat and the movement intensity of Reeves's Pheasant differed between sexes. For males, the distance to forest paths had a positive correlation with their movement intensity through affecting body conditions. For females, the distance to forest paths and farmland had a negative correlation with their movement intensity through affecting habitat conditions and reproductive behaviors. Our study provides a scientific basis for the protection of the Reeves's Pheasant and other related terrestrial forest-dwelling birds.

Endocrine disrupting pesticides impair the neuroendocrine regulation of reproductive behaviors and secondary sexual characters of red munia (Amandava amandava).

The exposure effects of two endocrine disrupting pesticides (EDPs), mancozeb/MCZ and imidacloprid/IMI of the group dithiocarbamate and neonicotinoid respectively, on reproductive behaviors and secondary sexual characters have been studied in a seasonally breeding wildlife bird, red munia (Amandava amandava). Adult male birds were exposed to both the pesticides individually (0.25% LD50 of each) as well as co-exposed (MIX-I: 0.25% LD50 of each and MIX-II: 0.5% LD50 of each) through food for 30d in preparatory (July-August) and breeding (September-October) phase of reproductive cycle. Singing and pairing patterns started decreasing from 2nd week to complete disappearance during 4th week of pesticides exposures at both the phases of reproductive cycles. Similar trend was observed in the disappearance of spots on the plumage as well as color of both plumage and beak which turned black/gray from red. Pesticides caused impairment of the lactotropic as well as hypothalamic-pituitary-testicular (HPT) axes as there was increased plasma PRL and decreased LH, FSH and testosterone levels. Testicular expressions of GnRH and androgen receptor/AR were significantly decreased but that of GnIH significantly increased as compared to control. Significant differences among individually- and co-exposed groups were also present. Abnormalities in sexual behaviors and secondary sexual characteristics could be linked to inhibition of HPT axis and/or direct toxicity at the level of hypothalamus, pituitary and testis. In addition, pesticide-induced hyperprolactinemia as well as impaired thyroid hormones might have also affected maintenance of reproductive behaviors. On co-exposures, the more distinct impairments might be due to cumulative toxicity of pesticides.

Environmental factors, epigenetics, and developmental origin of reproductive disorders.

Sex-specific differentiation, development, and function of the reproductive system are largely dependent on steroid hormones. For this reason, developmental exposure to estrogenic and anti-androgenic endocrine disrupting chemicals (EDCs) is associated with reproductive dysfunction in adulthood. Human data in support of "Developmental Origins of Health and Disease" (DOHaD) comes from multigenerational studies on offspring of diethylstilbestrol-exposed mothers/grandmothers. Animal data indicate that ovarian reserve, female cycling, adult uterine abnormalities, sperm quality, prostate disease, and mating behavior are susceptible to DOHaD effects induced by EDCs such as bisphenol A, genistein, diethylstilbestrol, p,p'-dichlorodiphenyl-dichloroethylene, phthalates, and polyaromatic hydrocarbons. Mechanisms underlying these EDC effects include direct mimicry of sex steroids or morphogens and interference with epigenomic sculpting during cell and tissue differentiation. Exposure to EDCs is associated with abnormal DNA methylation and other epigenetic modifications, as well as altered expression of genes important for development and function of reproductive tissues. Here we review the literature exploring the connections between developmental exposure to EDCs and adult reproductive dysfunction, and the mechanisms underlying these effects.

Imigração, fronteiras étnicas e sociabilidades: questões teóricas / Immigration, ethnic borders and sociabilities: theoretical issues / Inmigración, fronteras étnicas y sociabilidades: cuestiones teóricas

O texto tem como referência sujeitos agrupados social e culturalmente a partir de um processo de emigração/imigração, cujas estruturas remontam às sociedades emissoras. Transcendendo o estabelecimento no município de Curitiba, Paraná, o grupo transforma-se gradativamente em contato com a sociedade brasileira e com outros agrupamentos de origem imigrante, erigindo fronteiras étnicas. Um dos direcionamentos da investigação foi conduzido por análises de comportamentos reprodutivos dos imigrantes e descendentes. O objetivo, neste estágio, é ultrapassar o porquê para tentar resolver o problema do como, apesar da ausência de documentação "qualitativa" que permitiria discernir a intimidade dos casais amostrados. Desse modo, colocam-se algumas questões teórico-metodológicas considerando o papel dos indivíduos, no âmbito do conceito das sociabilidades. Ou seja, na esfera das relações indivíduo-sociedade, investiga-se quais seriam as variáveis teóricas que poderiam ajudar a entender o que os números parecem denunciar. Para isso, consideram-se as relações interpessoais - incluindo o convívio intra e intergeracional - nos limites das mencionadas fronteiras. Com essa finalidade, a análise privilegia contextos que permitem sintetizar a dinâmica da etnicidade. Igualmente, propõe-se um balanço teórico-metodológico tendo como foco as minhas pesquisas, orientadas, num sentido epistemológico mais lato, por estudos "demográficos"; os dados de base foram amostrados a partir da metodologia da reconstituição de famílias.

The reference for this text are the subjects grouped socially and culturally from a process of emigration/immigration, whose structures refer back to the migrant societies. Following the settlement in Curitiba, the group gradually transforms itself when in contact with Brazilian society and with other groups of immigrant origin, erecting ethnic boundaries. One of the directions of the research involved conducting an analysis of reproductive behaviors of immigrants and descendants. The goal, at this stage, is to overcome the why to try to solve the problem of how, despite the absence of "qualitative" documentation that would allow us to discern the intimacy of the sampled couples. The purpose of the text is to pose some theoretical and methodological questions considering the role of individuals within the concept of sociability. That is, in the sphere of individual-society relations, the idea is to consider the theoretical variables that could help understand what the numbers seem to expose. For this, interpersonal relationships are taken into consideration - including intra and intergenerational living - within the boundaries of the aforementioned borders. To this end, the analysis favors contexts that allow for the synthesizing of ethnicity dynamics. The text also seeks a theoretical-methodological balance focusing on my research, oriented, in a broader epistemological sense, by "demographic" studies; baseline data were sampled from the methodology of family reconstitution.

El texto tiene como referencia sujetos agrupados social y culturalmente a partir de un proceso de emigración/inmigración, cuyas estructuras remontan a las sociedades emisoras. Transcendiendo el establecimiento en Curitiba, el grupo, en contacto con la sociedad brasileña y con otros agrupamientos de origen inmigrante, se transforma gradualmente y erige fronteras étnicas. Uno de los direccionamientos de la investigación fue conducido por el análisis de los comportamientos reproductivos de los inmigrantes y sus descendientes. El objetivo, en esta etapa, es adelantar el porqué para intentar resolver el problema del cómo, a pesar de la ausencia de documentación cualitativa que permitiría discernir la intimidad de las parejas muestrados. De ese modo, se presentan algunas cuestiones teórico-metodológicas al considera el papel de los individuos, en el ámbito del concepto de las sociabilidades. O sea, en la esfera de las relaciones individuo-sociedad, se investiga cuáles serían las variables teóricas que podrían ayudar a entender lo que los números parecen denunciar. Para eso, se consideran las relaciones interpersonales —incluyendo la convivencia intra e intergeneracional— en los límites de las mencionadas fronteras. Con esa finalidad, el análisis privilegia contextos que permiten sintetizar la dinámica de la etnicidad. Igualmente, se propone un balance teórico-metodológico teniendo como foco mis investigaciones, orientadas, en un sentido epistemológico más laxo, por estudios demográficos. Los datos de base fueron recogidos a partir de la metodología de la reconstitución de familias.

Environmental Health Factors and Sexually Dimorphic Differences in Behavioral Disruptions.

Mounting evidence suggests that environmental factors-in particular, those that we are exposed to during perinatal life-can dramatically shape the organism's risk for later diseases, including neurobehavioral disorders. However, depending on the environmental insult, one sex may demonstrate greater vulnerability than the other sex. Herein, we focus on two well-defined extrinsic environmental factors that lead to sexually dimorphic behavioral differences in animal models and linkage in human epidemiological studies. These include maternal or psychosocial stress (such as social stress) and exposure to endocrine-disrupting compounds (such as one of the most prevalent, bisphenol A [BPA]). In general, the evidence suggests that early environmental exposures, such as BPA and stress, lead to more pronounced behavioral deficits in males than in females, whereas female neurobehavioral patterns are more vulnerable to later in life stress. These findings highlight the importance of considering sex differences and developmental timing when examining the effects of environmental factors on later neurobehavioral outcomes.