Germline genomes--a biological fountain of youth?

The fusion of male- and female-derived gametes initiates the phenomenal process of producing a highly complex mammalian organism. Successful reproduction is so important that mammals invoke a battery of protective mechanisms for the germ cell lineages that function to maximize genetic integrity while still allowing genetic diversity and adaptation. Protective mechanisms likely include, but are not limited to, robust DNA repair to safeguard genetic integrity and apoptosis to remove cells with intolerable levels of DNA damage. Analyses of spontaneous mutant frequencies are generally consistent with germline DNA being stringently maintained relative to somatic tissues. Despite the rigorous protection afforded germ cells, genetic integrity is observed to decline with increased maternal and paternal age. It is not yet clear whether cells in the germ line truly age or whether other processes decline or become dysfunctional with age. For example, in a younger animal, the differentiation and/or utilization of germ cells with lower genetic integrity might be disallowed, whereas in an older animal, such cells might slip past these quality-control mechanisms.     

Maternal foster families provide more stable placements than paternal families

The use of kinship families to provide foster care has been increasing due to changes in legislation and the hope that it will provide better quality placements, but there has been little consideration of differential outcomes based on sub-types of kin. Using data from one Ontario, Canada, child protection agency we compared the frequency and stability of placements with maternal versus paternal kin. We found that maternal relatives provided placements much more often than paternal kin and this was most striking with single grandmothers. 90% of genetically related kinship caregivers were grandparents or other equally close kin. Maternal and paternal kin placements had similar durations, but maternal placements ended significantly more frequently by the child returning home or obtaining a permanent placement, whereas paternal placements more often broke down. A Cox proportional hazards analysis, controlling for child sex, age, reason for placement and caregiver attributes, showed that paternal kin placements were more than twice as likely to break down as maternal kin placements, within a given interval. We discuss whether placement stability should be considered a proxy for placement quality and policy implications, and we comment on aspects of assessing prospective placements.     

Timing of Parental Separation and Attachment to Parents in Adolescence: Results of a Prospective Study from Birth to Age 16

Using prospective longitudinal data from the Christchurch Health and Development Study (CHDS), this paper examines the effects of parental separation on the quality of adolescents' attachment to parents and their perceptions of parental care and overprotection during childhood. Exposure to parental separation was significantly associated with lower attachment to parents in adolescence and more negative perceptions of maternal and paternal care and protection during childhood. When examined in relation to the developmental timing of first separation, a linear relationship between the age at first separation and later parental attachment and perceived parent–child relations was found. The younger the age of the child at the time of separation, the lower their subsequent parental attachment and the more likely they were to perceive both their mother and father as less caring and more overprotective. No gender differences were found in children's responses to parental separation. These findings persisted after control for the confounding effects of family social background, marital conflict, parenting, child behavior, and remarriage. Results supported the importance of the early childhood years for the development of a secure and enduring attachment relationship between children and their parents.     

Parental style,parental practices,and socialization outcomes: An investigation of their linkages in the consumer socialization context

This study aims to generate insights into the mechanisms through which parental style influences adolescent consumer socialization. Toward this end, it examines two alternative conceptual frameworks: (1) The mediation model which posits two key dimensions of parental style (responsiveness and demandingness) as antecedent variables affecting adolescent consumer socialization directly and indirectly through parental socialization practices and (2) the moderation model which posits each parental style dimension as a moderator of the link between parental socialization practices and adolescent socialization outcomes. The influences of maternal and paternal parental styles on adolescent socialization outcomes are investigated separately and compared. Results provide stronger support for the mediation model. They also show that mothers’ parental style and practices are more influential than fathers’ in shaping adolescents’ consumer socialization outcomes.     

Parental Incarceration and the Transition to Adulthood

The growing literature on the intergenerational consequences of incarceration generally neglects to consider how paternal and maternal incarceration structures offspring's transition to adulthood, a fundamental life course stage that has become increasingly unequal. In this article, the authors use data from the National Longitudinal Study of Adolescent to Adult Health to explore the relationship between parental incarceration and both subjective (e.g., respondent feels older compared to others his or her age) and behavioral (e.g., respondent is a parent) indicators of adulthood transitions among respondents younger than age 24 (N = 10,937). The results suggest that both paternal and maternal incarceration is positively associated with the number of subjective and behavioral adulthood transitions. The results also suggest that parental incarceration is associated with some individual indicators, especially subjective indicators, of adulthood. Taken together, these findings highlight that the high incarceration rate in the United States has transformative intergenerational consequences.     

Parental Death and Subjective Age: Indelible Imprints from Early in the Life Course?*

Past research suggests that sustaining a young identity helps adults maintain a greater sense of well‐being. The experience of subjective aging, however, is not a spontaneous phenomenon, but stems from lifelong developmental experiences. Drawing from writings on the life course and self‐concept, I consider how parental death in childhood shapes subjective age in adulthood. To examine the effects of maternal and paternal death on subjective age, I employ the Midlife Development in the United States Study (MIDUS). A series of linear regression analyses indicates that maternal death during childhood is associated with an older subjective age in adulthood, death of a father does not have a similar influence on subjective age, and that the effect on subjective age is stronger if maternal death occurred during childhood than during other periods of the life course. The findings highlight interconnections between timing of transitions in the life course, linked lives, and the development of self‐concept. Subjective age in adulthood seems to hinge on important biographical experiences from childhood, such as parental death, though the processes differ by the gender of the deceased parent.     

Characteristics of responding-, nonresponding- and refusing-parents in an adolescent lifestyle choice study.

The acquisition of a random sample is one of the many methodological problems that arise when conducting research with adolescent populations. Frequently, due to ethical considerations associated with collecting data from adolescents, active parental consent procedures are required. The current study examined characteristics of parents who consented, refused consent, or did not respond to an active consent request for their children to participate in a large-scale study of adolescent lifestyle behaviors. Results indicated nonresponding-parents were more likely to be employed than consenting-parents. Further, differences were found for a number of attitudinal variables and about the importance of adolescent research. There were significant differences between refusing-parents, and consenting- and nonresponding-parents who were similar in their attitudes toward adolescent research. The findings suggest that nonresponding-parents are characteristically more similar to consenting-parents than to refusing-parents, which supports the use of passive consent procedures as a reasonable alternative to requiring active parental consent in adolescent research.     

Differential Mother and Father Influences on the Educational Attainment of Black and White Women*

This study examines the impacts of maternal and paternal influences on the educational attainment of women and whether these parental effects operate similarly for white and black women. Specifically, the study measures the differential effects of mother's and father's education, occupation, and encouragement. Using data from the National Longitudinal Survey of Labor Market Experience (NLS), 428 white and 145 black women were examined. Findings indicate different patterns in the way mothers and fathers affect their daughters' educational attainments. For both groups of women, father's education was found to be a generally better predictor than mother's education, while mother's occupation was more important than father's occupation. Mother's occupation and parental expectation variables were relatively more important for black women, and parental education variables were more important for white women.     

Beyond Orphanhood: Parental Nonresidence and Child Well‐being in Tanzania

This article used data from the Rufiji Health and Demographic Surveillance System in Tanzania to examine the influence of parental nonresidence on child survival and school entry. Using survival analysis methods, the article tested variations by parent and by cause, examining parental death, nonresidence because of parental relationship status, and migration. In general, maternal nonresidence was more consequential for child survival, whereas paternal nonresidence influences school entry. This is consistent with gendered parenting patterns in the setting. There was important variation by cause and by outcome, particularly for paternal nonresidence. Paternal nonresidence because of nonmarital birth was associated with increased risk of child death, whereas paternal migration was associated with improved survival. Paternal death and migration were associated with lower odds of school entry. This article moves beyond orphanhood to consider multiple causes of parental nonresidence simultaneously, demonstrating that parental nonresidence is not uniformly deleterious for children.     

Child Care and Child Births: The Role of Grandparents in the Netherlands

This study explored the involvement of grandparents in the care for young children and its effect on subsequent child births in dual‐earner families, using data on 898 Dutch men and women aged 18–49 from the Netherlands' Kinship Panel Study. Three theoretical perspectives were used to develop hypotheses: (a) needs and opportunities, (b) normative preferences, and (c) gendered involvement of grandparents. The findings showed that needs and opportunities informed involvement of grandparents but that the availability of formal child care did not predict grandparents' involvement. Maternal grandparents were more likely to provide child care than paternal grandparents, and grandmothers were more likely to do so than grandfathers. Involvement of both maternal and paternal grandparents in turn increased the likelihood of additional child births. The authors conclude that grandparental child care may be part of an emerging reproductive strategy. Implications of these findings for the theoretical approaches used are discussed.     

Parental unemployment and children's educational attainment: How big is the role of aspirations?

Children exposed to parental unemployment have been found to lag behind in school, but research has struggled to pin down the underlying explanation. One hypothesis is that parental unemployment may dampen children's aspirations to do well and go far in school. Yet, few studies on parental unemployment have relied on actual measures of children's aspirations or devised a formal analysis of this mechanism. Using the UK Household Longitudinal Study (Waves 1–12, N = 1067), I investigate the role of educational aspirations in children's General Certificate of Secondary Education (GCSE) attainment. I compare adolescents exposed to parental unemployment before or only after the typical age at which GCSE exams are taken. In adjusted models, children exposed to parental unemployment before their GCSEs are around 6 percentage points less likely to attain any GCSE qualification by age 17. On average, children have high educational aspirations, although intentions to enrol in college or university are relatively lower among children exposed to an early spell of parental unemployment. Nevertheless, a hypothetical intervention setting these aspirations to the same level for all children only accounts for a modest portion of the educational penalty tied to an early spell of parental unemployment. Several sensitivity and robustness tests support this conclusion. This note seeks to stimulate more research on the mechanisms underpinning the intergenerational effects of unemployment. Findings cast doubts on the idea that children's aspirations, the target of broader policy discourse and interventions, are a crucial part of the equation.     

The Relations Between Parents' Smoking, General Parenting, Parental Smoking Communication, and Adolescents' Smoking

The present study examined whether the associations between general parenting practices (i.e., support, behavioral control, and psychological control) and parental smoking on the one hand and older and younger siblings' smoking on the other were mediated by parental smoking communication (i.e., frequency and quality of parent–adolescent communication concerning smoking-related issues). The focus of this paper was on examining whether these associations of parental actions and adolescents' smoking were different in older and younger siblings within the family. Participants were 428 Dutch families (mother, father, and their 2 adolescent siblings aged 13–17). The results of parent and adolescent reports indicated that general parenting practices and parental smoking were associated with parental smoking communication, which, in turn, was related with adolescent smoking. The magnitude of the associations between parenting and adolescent smoking did not differ between older and younger siblings. Supportive parents were generally more likely to engage in a high quality communication about smoking with their adolescent children; this was related to a lower likelihood to smoke. Parents who exerted psychological control were more likely to talk more frequently with their adolescents on smoking matters, which in turn, relates to a higher likelihood to smoke. Also, smoking parents were less likely to have high-quality parent–adolescent communication that relates to higher likelihoods to smoke. In general, the findings were similar across reporters. Implications for prevention are addressed.     

Chapter 6: Effects of Paternal Involvement on Fathers and Mothers

In the last two decades, average levels of paternal involvement in childcare have increased significantly (Lamb, Pleck, Charnov, & Levine, in press), albeit more slowly than many in the media would have us believe. Most professional discussions of these secular changes have focuscd on the effects of increased paternal involvement on children. In this brief chapter, we discuss the likely effects of increased paternal involvement on mothers and fathers.     

Childhood Overweight: Does Quality of Parental Childcare Time Matter?

This study investigates the impact of parental primary childcare time (quality time) and parental secondary childcare time (multi-tasking time) on children’s overweight probability using data collected from each parent and one child aged 9–16 from 311 families in Houston MSA, US. We find that the primary childcare time is not marginally more important than the secondary childcare time and paternal childcare time is especially important for young children (age 9–11). Furthermore, if parents of overweight children adopt the time inputs of parents of healthy weight children, the predicted overweight probability decreases by ~15% on average, ceteris paribus. If either one of the parents is completely uninvolved, the overweight probability increases by ~21% on average, ceteris paribus.     

Parental Divorce,Residence Arrangements,and Contact Between Grandchildren and Grandparents

When parents divorce, grandparents can play a supportive role in the lives of their grandchildren, but a parental divorce may also put grandchild–grandparent ties under pressure. In this study the authors investigated how grandchildren of married and divorced parents differ in the frequency of face‐to‐face contacts with grandparents and how this is mediated by postdivorce residence arrangements. Based on the multi‐actor survey “Divorce in Flanders,” they used reports of contact provided by more than 1,000 grandchildren and compared them with more than 1,100 grandparent reports for validation. The results showed that grandchildren from divorced parents have fewer contacts with their grandparents than grandchildren whose parents are married but that it is the postdivorce residence arrangement of grandchildren that produces this result. When grandchildren live with their divorced father or in a shared residence arrangement, they even see paternal grandparents more often than grandchildren with married parents.     

Male age and progeny

Testicular aging affects simultaneously the individual and his lineage. In the individual, changes in the vascular and endocrine systems, in the blood-testis barrier and in Sertoli cells, because of increasing age, lead to a decrease in the number of spermatozoa and an alteration in their form and motility. Gamete quality is also low in very young men. These changes lead to a gradual decrease of fertility. In the progeny, paternal aging is responsible for new dominant autosomic mutations which themselves cause different malformations such as achondroplasia, Apert's or Recklinghausen disease, Marfan's syndrome, and, perhaps, certain chromosome X-linked recessive mutations such as Duchenne's myopathy or hemophilia A. Moreover, in mouse, rat and man, a very young age and paternal aging seem to be responsible for a gradual lowering in the level of cognitive functions in the progeny. Thus, the curve corresponding to this phenomenon presents an inverted U-shape, of which the top corresponds in man to about 30 years of paternal age. Maternal age does not appear to play a part in this event. These results pose the problem of the optimum age for fatherhood.     

Familism Values,Family Time,and Mexican‐Origin Young Adults' Depressive Symptoms

Using longitudinal data across eight years, this study examined how parents' familism values in early adolescence predicted youths' depressive symptoms in young adulthood via youths' familism values and family time. We examined these processes among 246 Mexican‐origin families using interview and phone‐diary data. Findings revealed that fathers' familism values predicted male and female youths' familism values in middle adolescence. For female youth only, fathers' familism values also predicted youths' family time in late adolescence. The link between family time and young adults' depressive symptoms depended on parental acceptance and adolescent gender: Among female and male youth, family time predicted fewer depressive symptoms, but only when paternal acceptance was high. For female adolescents only, family time predicted fewer depressive symptoms when maternal acceptance was high but more depressive symptoms when maternal acceptance was low. Findings highlight family dynamics as the mechanisms through which familism values have implications for youths' adjustment.     

Paternal Incarceration and Children’s Social-Emotional Functioning at Age Nine: Why Fathers’ Violence Matters

Research documents the consequences of parental incarceration for children’s well-being, and studies have begun to explore heterogeneity in parental incarceration’s influence on child outcomes. This study investigates the effect of paternal incarceration on children’s social competence. Using data from the Fragile Families and Child Wellbeing Study, a longitudinal study of new parents in urban areas, I examine (1) the effect of recent paternal incarceration on multiple measures of children’s social-emotional functioning, including children’s social competence, and (2) whether fathers’ violence against mothers and children weakens the effect of recent paternal incarceration on children’s social-emotional functioning. The results from propensity score and multivariate regression analyses show that recent paternal incarceration is detrimental to children’s social-emotional functioning, in general. However, for some indicators of children’s social-emotional functioning, the effects of recent paternal incarceration depend on whether fathers are abusive.     

Child sexual abuse victims' perception of paternal support as a significant predictor of coping style and global self-worth

One hundred eighty-eight female participants (44 victims and 144 non-victims of CSA) from a 4-year university were recruited. The first objective examined the difference between victims and non-victims on measures of perceived social support, coping strategies, and global self-worth. Victims were more likely to report lower maternal support than non-victims of CSA. Additionally, victims who were perpetrated by a family member were more likely to report lower maternal support than those who were perpetrated by a non-family member. The second objective investigated the impact of victimization and several mediating factors on global self-worth. Victimization indirectly related to global self-worth through paternal support. Additional analyses examining non-victims showed significant direct relations between paternal, friend, and campus support leading to global self-worth. For victims, paternal support indirectly related to global self-worth through emotion- focused coping. These results indicate that paternal support and coping strategies may be important for later psychological adjustment in victims of CSA.