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Insect developmental transitions are precisely coordinated by ecdysone and juvenile hormone (JH). We previously revealed that accumulated H3K27 trimethylation (H3K27me3) at the locus encoding JH signal transducer Hairy is involved in the larval-pupal transition in insects, but the underlying mechanism remains to be fully defined. Here, we show in Drosophila and Bombyx that Rpd3-mediated H3K27 deacetylation in the prothoracic gland during the last larval instar promotes ecdysone biosynthesis and the larval-pupal transition by enabling H3K27me3 accumulation at the Hairy locus to induce its transcriptional repression. Importantly, we find that the homeodomain transcription factor Schlank acts to switch active H3K27 acetylation (H3K27ac) to repressive H3K27me3 at the Hairy locus by directly binding to the Hairy promoter and then recruiting the histone deacetylase Rpd3 and the histone methyltransferase PRC2 component Su(z)12 through physical interactions. Moreover, Schlank inhibits Hairy transcription to facilitate the larval-pupal transition, and the Schlank signaling cascade is suppressed by JH but regulated in a positive feedback manner by ecdysone. Together, our data uncover that Schlank mediates epigenetic reprogramming of H3K27 modifications in hormone actions during insect developmental transition. [ABSTRACT FROM AUTHOR]

Although it is widely accepted that human beings have an ingrained 'need to belong,' there seem to be a substantial subset of young people who seclude themselves for most of the time at home and no longer engage in education or work, ultimately withdrawing from participation in society. In Japan, this phenomenon has been labeled as 'hikikomori,' but given its global presence it may be preferable to use the term 'extreme social withdrawal' (ESW). In this qualitative review, we provide a description and definition of ESW, provide figures on its prevalence, and discuss a number of associated concepts, including loneliness and "aloneliness," school absenteeism and dropout, the 'new' developmental stage of adultolescence, and the labor force categories of freeter ('freelance arbeiter') and NEET (a young person not in employment, education, or training). The core of the paper is focused on the origins of ESW in young people and provides a narrative overview of relevant etiological factors, such as aberrant brain processes, unfavorable temperament, psychiatric conditions, adverse family processes including detrimental parenting, negative peer experiences, societal pressures, and excessive internet and digital media use, which are all placed within a comprehensive developmental psychopathology framework. We will close with a discussion of possible interventions for young people with ESW and formulate a guideline that describes (the temporal order of) various components that need to be included in such a treatment. [ABSTRACT FROM AUTHOR]

Interaction between the embryo and endosperm affects seed development, an essential process in yield formation in crops such as rice. Signals that mediate communication between embryo and endosperm are largely unknown. We used the notched-belly (NB) mutant with impaired communication between embryo and endosperm to investigate the effect of the embryo on developmental staging of the endosperm and signaling pathways in the embryo that regulate endosperm development. Hierachical clustering of mRNA datasets from embryo and endosperm samples collected during development in NB and a wild type showed a delaying effect of the embryo on the developmental transition of the endosperm by extension of the middle stage. K-means clustering further identified coexpression modules of gene sets specific to embryo and endosperm development. Combined gene expression and biochemical analysis showed that T6P–SnRK1, gibberellin and auxin signaling by the embryo regulate endosperm developmental transition. We propose a new seed developmental staging system for rice and identify the most detailed signature of rice grain formation to date. These will direct genetic strategies for rice yield improvement.

Hosts can defend themselves against parasites either by preventing or limiting infections (resistance) or by limiting parasite-induced damage (tolerance). However, it remains underexplored how these defense types vary over host development with shifting patterns of resource allocation priorities. Here, we studied the role played by developmental stage in resistance and tolerance in Atlantic salmon (Salmo salar). This anadromous fish has distinct life stages related to living in freshwater and seawater. We experimentally exposed 1-year-old salmon, either at the freshwater stage or at the stage transitioning to the marine phase, to the trematode Diplostomum pseudospathaceum. Using 56 pedigreed families and multivariate animal models, we show that developmental transition is associated with reduced resistance but does not affect tolerance. Furthermore, by comparing tolerance slopes (host fitness against parasite load) based on additive genetic effects among infected and unexposed control relatives, we observed that the slopes can be largely independent of the infection, that is, they may not reflect tolerance. Together, our results suggest that the relative importance of different defense types may vary with host development and emphasize the importance of including control treatments for more confident interpretations of tolerance estimates. [ABSTRACT FROM AUTHOR]

Insect developmental transitions are precisely coordinated by ecdysone and juvenile hormone (JH). We previously revealed that accumulated H3K27 trimethylation (H3K27me3) at the locus encoding JH signal transducer Hairy is involved in the larval-pupal transition in insects, but the underlying mechanism remains to be fully defined. Here, we show in Drosophila and Bombyx that Rpd3-mediated H3K27 deacetylation in the prothoracic gland during the last larval instar promotes ecdysone biosynthesis and the larval-pupal transition by enabling H3K27me3 accumulation at the Hairy locus to induce its transcriptional repression. Importantly, we find that the homeodomain transcription factor Schlank acts to switch active H3K27 acetylation (H3K27ac) to repressive H3K27me3 at the Hairy locus by directly binding to the Hairy promoter and then recruiting the histone deacetylase Rpd3 and the histone methyltransferase PRC2 component Su(z)12 through physical interactions. Moreover, Schlank inhibits Hairy transcription to facilitate the larval-pupal transition, and the Schlank signaling cascade is suppressed by JH but regulated in a positive feedback manner by ecdysone. Together, our data uncover that Schlank mediates epigenetic reprogramming of H3K27 modifications in hormone actions during insect developmental transition., Competing Interests: Competing interests statement:The authors declare no competing interest.

Development of sexual characters and generation of gametes are tightly coupled with growth. Platynereis dumerilii is a marine annelid that has been used to study germline development and gametogenesis. P. dumerilii has germ cell clusters found across the body in the juvenile worms, and the clusters eventually form the gametes. Like other segmented worms, P. dumerilii grows by adding new segments at its posterior end. The number of segments reflect the growth state of the worms and therefore is a useful and measurable growth state metric to study the growth‐reproduction crosstalk. To understand how growth correlates with progression of gametogenesis, we investigated germline development across several developmental stages. We discovered a distinct transition period when worms increase the number of germline clusters at a particular segment number threshold. Additionally, we found that keeping worms short in segment number, by manipulating environmental conditions or via amputations, supported a segment number threshold requirement for germline development. Finally, we asked if these clusters in P. dumerilii play a role in regeneration (as similar free‐roaming cells are observed in Hydra and planarian regeneration) and found that the clusters were not required for regeneration in P. dumerilii, suggesting a strictly germline nature. Overall, these molecular analyses suggest a previously unidentified developmental transition dependent on the growth state of juvenile P. dumerilii leading to substantially increased germline expansion. HIGHLIGHTS: Total segment number predicts the state of germline development and the abundance of germline clusters in Platynereis dumerilii.Changing environmental conditions or amputating worms do not alter the segment number threshold requirement for germline development.The vasa‐expressing germ clusters are not required for regeneration in Platynereis dumerilii. [ABSTRACT FROM AUTHOR]

Varroa destructor is a major pathogenic driver of the Western honeybee colony losses globally. Understanding the developmental regulation of V. destructor is critical to develop effective control measures. Development is a complex biological process regulated by numerous genes and long non-coding RNAs (lncRNAs); however, the underlying regulation of lncRNAs in the development of V. destructor remains unknown. In this study, we analyzed the RNA sequencing (RNA-Seq) data derived from the four stages of female V. destructor in the reproductive phase (i.e., egg, protonymph, deutonymph, and adult). The identified differentially expressed mRNAs and lncRNAs exhibited a stage-specific pattern during developmental transitions. Further functional enrichment established that fat digestion and absorption, ATP-binding cassette (ABC) transporters, mitogen-activated protein kinase (MAPK) signaling pathway, and ubiquitin-proteasome pathway play key roles in the maturation of female V. destructor. Moreover, the lncRNAs and mRNAs of some pivotal genes were significantly upregulated at the deutonymph stage, such as cuticle protein 65/6.4/63/38 and mucin 5AC, suggesting that deutonymph is the key stage of metamorphosis development and pathogen resistance acquisition for female V. destructor. Our study provides novel insights into a foundational understanding of V. destructor biology.

As the primary caregivers for children with congenital heart disease (CHD), parents' perceptions are important for emerging adults to achieve independence. This integrative review of qualitative studies aimed to describe parents' perceptions of emerging adults with CHD. Seven electronic databases were searched. Data extraction and quality assessment were performed. A meta-synthesis was conducted to inductively develop essential themes from five included studies. Three essential themes encompassing the parents' perspective of emerging adults with CHD were: (1) concerns about emerging adults' ability to be independent; (2) concerns about emerging adults' future; and (3) impact of disease on family. The themes depicted parents' concerns and worries about their children's ability to successfully achieve independence, especially in disease self-management and life goals. This review highlights parents' concerns about their emerging adult children's independence. Understanding these concerns allows for developing interventions to facilitate emerging adults' independence and ease parents' worries. [ABSTRACT FROM AUTHOR]

Adult psychosocial difficulties, including psychiatric disorders, are often preceded by childhood psychosocial vulnerabilities, presenting critical windows of opportunity for preventative intervention. The present study aimed to identify longitudinal patterns (representing transitions between profiles) of childhood socio-emotional and cognitive vulnerability in the general population from early to middle childhood, in relation to key risk factors (e.g. parental mental illness and offending). Data were drawn from the New South Wales Child Development Study, which combines intergenerational multi-agency administrative records with cross-sectional assessments using data linkage methods. We analysed data from childhood assessments of socio-emotional and cognitive functioning at two time points (ages 5–6 and 10–11 years) that were linked with administrative data from government departments of health, child protection, and education for 19,087 children and their parents. Latent profile analyses were used to identify socio-emotional and cognitive profiles at each time point, and latent transition analyses were used to determine the probability and potential moderators of transition between profiles at each age. Three developmental profiles were identified in early childhood, reflecting typically developing, emotionally vulnerable, and cognitively vulnerable children, respectively; two profiles were identified in middle childhood, reflecting typically developing and vulnerable children. Child's sex, child protection services contact, parental mental illness, and parental offending influenced children's transitions between different vulnerability profiles, with the strongest effects for parental mental illness and child protection contact. Early detection of vulnerable children and factors promoting resilience are important steps in directing future health and social policy, and service planning for vulnerable children. [ABSTRACT FROM AUTHOR]

Introduction: Residential immersive life skills (RILS) programs are designed for youth with disabilities and facilitate the development of adaptive behaviors for life skills required to navigate adulthood. This study explored parents' experiences of the RILS program journey, shifts in parenting approaches, and the implications of those shifts.Methods: This study draws on twenty-three qualitative interviews that were conducted with nine parents of youth who attended RILS programs in Ontario, Canada. Three rounds of interviews were conducted at three different time points: Pre-program, 3 months post-program, and 12 months post-program. Data were analyzed using a constructivist grounded theory approach.Results: The interviews captured parents' experiences of the RILS program journey and how their parenting changed as a result. Three overarching themes emerged: (1) Anticipation of RILS programs served as a catalyst for experiencing positive and negative tensions in parenting; (2) Parenting shifted following RILS programs; and (3) Where parenting shifts were limited, challenges for youth arose and reduced youth future growth.Conclusion: Parenting approaches can shift as a result of youth attending RILS programs. These shifts can create complex and challenging implications for parents as they seek to further encourage youths' development. This study offers an understanding of the implications of parenting during youths' developmental transition of adolescence to adulthood, and offers recommendations to further support parents in sustaining youth development of life skills during this developmental transition. [ABSTRACT FROM AUTHOR]

Summary: Ethylene is the main hormone controlling climacteric fruit ripening; however, the mechanisms underlying the developmental transition leading to the initiation of the ripening process remain elusive, although the presumed role of active hormone interplay has often been postulated.To unravel the putative role of auxin in the unripe‐to‐ripe transition, we investigated the dynamics of auxin activity in tomato fruit and addressed the physiological significance of Sl‐SAUR69, previously identified as a RIN target gene, using reverse genetics approaches.Auxin signalling undergoes dramatic decline at the onset of ripening in wild‐type fruit, but not in the nonripening rin mutant. Sl‐SAUR69 exhibits reduced expression in rin and its up‐regulation results in premature initiation of ripening, whereas its down‐regulation extends the time to ripening. Overexpression of Sl‐SAUR69 reduces proton pump activity and polar auxin transport, and ectopic expression in Arabidopsis alters auxin transporter abundance, further arguing for its active role in the regulation of auxin transport.The data support a model in which Sl‐SAUR69 represses auxin transport, thus generating auxin minima, which results in enhanced ethylene sensitivity. This defines a regulation loop, fed by ethylene and auxin as the main hormonal signals and by RIN and Sl‐SAUR69 as modulators of the balance between the two hormones. [ABSTRACT FROM AUTHOR]

Abstract The complex interplay between genetic and environmental factors, such as diet and lifestyle, defines the initiation and progression of multifactorial diseases, including cancer, cardiovascular and metabolic diseases, and neurological disorders. Given that most of the studies have been performed in controlled experimental settings to ensure the consistency and reproducibility, the impacts of environmental factors, such as dietary perturbation, on the development of animals with different genotypes and the pathogenesis of these diseases remain poorly understood. By analyzing the cdk8 and cyclin C (cycC) mutant larvae in Drosophila , we have previously reported that the CDK8-CycC complex coordinately regulates lipogenesis by repressing dSREBP (sterol regulatory element-binding protein)-activated transcription and developmental timing by activating EcR (ecdysone receptor)-dependent gene expression. Here we report that dietary nutrients, particularly proteins and carbohydrates, modulate the developmental timing through the CDK8/CycC/EcR pathway. We observed that cdk8 and cycC mutants are sensitive to the levels of dietary proteins and seven amino acids (arginine, glutamine, isoleucine, leucine, methionine, threonine, and valine). Those mutants are also sensitive to dietary carbohydrates, and they are more sensitive to monosaccharides than disaccharides. These results suggest that CDK8-CycC mediates the dietary effects on lipid metabolism and developmental timing in Drosophila larvae. Highlights • The cdk8 and cycC mutant Drosophila larvae are hypersensitive to increased levels of dietary proteins. • Of the 20 kinds of amino acids, the cdk8 and cycC mutants are particularly sensitive to the levels of 7 specific amino acids. • Compared to disaccharides, the cdk8 and cycC mutants are more sensitive to increased dietary monosaccharides. • CDK8-CycC may mediate the dietary effects on lipid metabolism and developmental transition in Drosophila larvae. [ABSTRACT FROM AUTHOR]

Leading research argues the distinct importance of earliest detection of childhood behavior problems and the value of discovering subsequent change patterns as children transition through the early education years. This study examined the relative contributions of earliest assessments of children's problem behaviors as compared to the changes in those behaviors over time for the prediction of important later outcomes. Focusing on the representative national sample from the Head Start Impact Study (n = 3,827), classroom behavior problems were assessed across 4 years spanning prekindergarten through first grade. Individual child indices were derived in multilevel growth modeling to reflect initial assessments and subsequent change patterns. These indices were thereafter applied in multilevel logistic regression and receiver operating characteristic curve analyses to predict later academic and social difficulties. Both children's initial assessments and their transitional changes proved to be good predictors of most outcomes, where the accuracy for initial assessments and transitional changes was effectively equivocal. The evidence clarifies that initial assessment of behavior problems is sufficient to predict later outcomes; additional assessments did not augment forecasting accuracy nor did the combination of both initial assessment and information about subsequent change improve accuracy. Implications are discussed for assessment theory and practice. [ABSTRACT FROM AUTHOR]

In this study, we explored the molecular alterations in the developmental switch from the L3 to the exsheathed L3 (xL3) and to the L4 stage of Haemonchus contortus in vitro using an integrated transcriptomic, proteomic and bioinformatic approach. Totals of 9,754 mRNAs, 88 microRNAs (miRNAs) and 1,591 proteins were identified, and 6,686 miRNA-mRNA pairs inferred in all larval stages studied. Approximately 16% of transcripts in the combined transcriptome (representing all three larval stages) were expressed as proteins, and there were positive correlations ( r  = 0.39–0.44) between mRNA transcription and protein expression in the three distinct developmental stages of the parasite. Of the predicted targets, 1,019 (27.0%) mRNA transcripts were expressed as proteins, and there was a negative correlation ( r  = −0.60 to −0.50) in the differential mRNA transcription and protein expression between developmental stages upon pairwise comparison. The changes in transcription (mRNA and miRNA) and protein expression from the free-living to the parasitic life cycle phase of H. contortus related to enrichments in biological pathways associated with metabolism (e.g., carbohydrate and lipid degradation, and amino acid metabolism), environmental information processing (e.g., signal transduction, signalling molecules and interactions) and/or genetic information processing (e.g., transcription and translation). Specifically, fatty acid degradation, steroid hormone biosynthesis and the Rap1 signalling pathway were suppressed, whereas transcription, translation and protein processing in the endoplasmic reticulum were upregulated during the transition from the free-living L3 to the parasitic xL3 and L4 stages of the nematode in vitro. Dominant post-transcriptional regulation was inferred to elicit these changes, and particular miRNAs (e.g., hco-miR-34 and hco-miR-252 ) appear to play roles in stress responses and/or environmental adaptations during developmental transitions of H. contortus . Taken together, these integrated results provide a comprehensive insight into the developmental biology of this important parasite at the molecular level in vitro. The approach applied here to H. contortus can be readily applied to other parasitic nematodes. [ABSTRACT FROM AUTHOR]

Oryza longistaminata, the African wild rice, can propagate vegetatively through rhizomes. Rhizomes elongate horizontally underground as sink organs, however, they undergo a developmental transition that shifts their growth to the surface of the ground to become aerial stems. This particular stage is essential for the establishment of new ramets. While several determinants such as abiotic stimuli and plant hormones have been reported as key factors effecting developmental transition in aerial stem, the cause of this phenomenon in rhizome remains elusive. This study shows that depletion of nutrients, particularly sucrose, is the key stimulus that induces the developmental transition in rhizomes, as indicated by the gradient of sugars from the base to the tip of the rhizome. Sugar treatments revealed that sucrose specifically represses the developmental transition from rhizome to aerial stem by inhibiting the expression of sugar metabolism and hormone synthesis genes at the bending point. Sucrose depletion affected several factors contributing to the developmental transition of rhizome including signal transduction, transcriptional regulation and plant hormone balance. [ABSTRACT FROM AUTHOR]

The reproductive success of plants largely depends on the correct programming of developmental phase transitions, particularly the shift from vegetative to reproductive growth. The timing of this transition is finely regulated by the integration of an array of environmental and endogenous factors. Nitrogen is the mineral macronutrient that plants require in the largest amount, and as such its availability greatly impacts on many aspects of plant growth and development, including flowering time. We found that nitrate signaling interacts with the age-related and gibberellic acid pathways to control flowering time in Arabidopsis thaliana. We revealed that repressors of flowering time belonging to the AP2-type transcription factor family including SCHLAFMUTZE (SMZ) and SCHNARCHZAPFEN (SNZ) are important regulators of flowering time in response to nitrate. Our results support a model whereby nitrate activates SMZ and SNZ via the gibberellin pathway to repress flowering time in Arabidopsis thaliana. [ABSTRACT FROM AUTHOR]

Self-efficacy is a key personal resource in individual development and successful adaptation, and it can serve innumerable purposes. Our study investigated levels and change rates in self-efficacy among newcomer and more experienced immigrant adolescents and tested whether acculturation-related and developmental variables explained inter-individual differences in self-efficacy in both groups. The sample comprised 480 newcomer (59% female, 15.8 years old) and 483 experienced (55% female, 15.9 years old) immigrant adolescents, assessed in four annual waves. Latent growth curve models showed newcomers to have lower levels and more pronounced increases of self-efficacy as compared to experienced immigrant adolescents. Both acculturation-related and developmental variables predicted self-efficacy. The results highlight the need for focusing on immigration stages and support the notion of combining developmental and acculturative factors in the study of immigrant adolescents. [ABSTRACT FROM AUTHOR]

Establishing new social relationships is important for mastering developmental transitions in young adulthood. In a 2-year longitudinal study with four measurement occasions (T1: n = 245, T2: n = 96, T3: n = 103, T4: n = 85), we investigated the role of social motives in college students' mastery of the transition of moving out of the parental home, using loneliness as an indicator of poor adjustment to the transition. Students with strong social approachmotivation reported stable and low levels of loneliness. In contrast, students with strong social avoidance motivation reported high levels of loneliness. However, this effect dissipated relatively quickly as most of the young adults adapted to the transition over a period of several weeks. The present study also provides evidence for an interaction between social approach and social avoidance motives: Social approach motives buffered the negative effect on social well-being of social avoidance motives. These results illustrate the importance of social approach and social avoidance motives and their interplay during developmental transitions. [ABSTRACT FROM AUTHOR]

Our study was designed to address a gap in the literature on parents’ perception and motivation to protect their infants from potential risk of injury in the transition from crawling to walking. The participants were 260 Italian subjects, of whom 158 were women and 102 men, aged between 20 and 45 years. They were asked to draw two domestic objects to assess the possible alterations in the perception of environmental elements seen by the parents as a potentially dangerous cause of unintentional injury for their child. Analysis showed that the group of mothers with children aged 9 to 18 months had drawn the largest tables, while the table areas of the other two categories of women were much smaller.Concerning males, the group that drew the largest tables was the one with children, but not in the age range of 9-18 months, while there was no great difference between the other two groups. The final descriptive analysis concerned the average scores on the STAI-Y tests both for state and trait anxiety. In all groups a substantial parity was observed, except for the non-parent men, who had a lower a lower level of state anxiety. Both the fathers and the mothers of children of 9-18 months obtained lower scores, both for state and trait anxiety. Based on the findings, we demonstrate that children transitioning from crawling to walking can elicit a perceptive reactivity their mothers, which satisfies their natural need to protect their offspring.

Our study was designed to address a gap in the literature on parents' perception and motivation to protect their infants from potential risk of injury in the transition from crawling to walking. The participants were 260 Italian subjects, of whom 158 were women and 102 men, aged between 20 and 45 years. They were asked to draw two domestic objects (a kitchen table and a CD cover) to assess the possible alterations in the perception of environmental elements seen by the parents as a potentially dangerous cause of unintentional injury for their child. Analysis showed that the group of mothers with children aged 9-18 months had drawn the largest tables, while the table areas of the other two categories of women were much smaller. As for the males, the group that drew the largest tables was the one with children, but not in the age range of 9-18 months, while there was little difference between the other two groups. The final descriptive analysis concerned the average scores on the STAI-Y tests both for state and trait anxiety. In all groups a substantial parity was observed, except for the non-parent men, who had a lower level of state anxiety. Both the fathers and the mothers of children aged 9-18 months obtained lower scores, both for state and trait anxiety. Based on the findings, we demonstrate that children transitioning from crawling to walking can elicit a perceptive reactivity in their mothers, which satisfies their natural need to protect their offspring. [ABSTRACT FROM AUTHOR]

During vegetative and embryonic developmental transitions, plant cells are massively reorganized to support the activities that will take place during the subsequent developmental phase. Studying cellular and subcellular changes that occur during these short transitional periods can sometimes present challenges, especially when dealing with Arabidopsis thaliana embryo and seed tissues. As a complementary approach, cellular reprogramming can be used as a tool to study these cellular changes in another, more easily accessible, tissue type. To reprogram cells, genetic manipulation of particular regulatory factors that play critical roles in establishing or repressing the seed developmental program can be used to bring about a change of cell fate. During different developmental phases, vacuoles assume different functions and morphologies to respond to the changing needs of the cell. Lytic vacuoles (LVs) and protein storage vacuoles (PSVs) are the two main vacuole types found in flowering plants such as Arabidopsis. Although both are morphologically distinct and carry out unique functions, they also share some similar activities. As the co-existence of the two vacuole types is short-lived in plant cells, how they replace each other has been a long-standing curiosity. To study the LV to PSV transition, LEAFY COTYLEDON2 (LEC2), a key transcriptional regulator of seed development, was overexpressed in vegetative cells to activate the seed developmental program. At the cellular level, Arabidopsis leaf LVs were observed to convert to PSV-like organelles. This presents the opportunity for further research to elucidate the mechanism of LV to PSV transitions. Overall, this example demonstrates the potential usefulness of cellular reprogramming as a method to study cellular processes that occur during developmental transitions.

Longitudinal studies have demonstrated that youth with mental health problems tend to have poor outcomes in adulthood. Moreover, many young adults do not make the transition from child- to adult-focused care even when they acknowledge their need for support. This study is an investigation of the needs and experiences of late adolescents with emotional and/or behavioral problems who accessed mental health services at a local child and adolescent clinic. In general, participants did not appear ready for an institutional transition. Adolescents disclosed their fears, underscoring the importance of supportive relationships, and stated the negative expectations they had concerning adult-focused care. The implementation of clinical supports to increase adolescents’ mental health self-efficacy may promote successful service transitions. [ABSTRACT FROM AUTHOR]

Procrastination as putting off until tomorrow what one had intended to do today is well-known tendency in everyday life. In an attempt to understand the character of procrastination in different life-domains, a large body of research has been accumulated over the last decades. This article was aimed to evaluate a specific decisional procrastination of school-to-work transition (SWT) that is treated as maturity postponement. Two studies are reported examining SWT procrastination defined as career indecision among Polish students graduating universities. In Study 1 (N=366), attitudinal and identity statuses were analyzed as correlates of career procrastination. A path analysis conducted for the model, which was aimed to explain the influence of career self-efficacy and occupational commitment on career indecision (dependent variable), revealed its very good fitness (RMSEA=.000). Those two independent variables explain 10% of career indecision variance. Stepwise multiple regression analyses conducted to ascertain relationship of five identity statuses (Brzezińska, Piotrowski, 2010) to procrastination measure (career indecision) showed that Commitment Making and Ruminative Exploration are strongest predictor variables. In study 2 (N=157), the stepwise multiple regression analyses conducted to ascertain the independent relationship of each of Big Five personality factor revealed that Neuroticism and Extraversion accounts of the most of explained variance of school-to-work transition procrastination. [ABSTRACT FROM AUTHOR]

This research provides insight into the interaction between SlAGO1s and miR168 in determining growth rate, phase change, leaf epinasty, fruit initiation and expansion, and other developmental processes in tomato.In Arabidopsis thaliana, ARGONAUTE1 (AGO1) interacts with miR168 to modulate the small RNA regulatory pathway. However, the underlying mechanism of regulation and relationship between AGO1 and miR168 is poorly understood in the cash crop Solanum lycopersicum (tomato). We previously found that SlAGO1A and SlAGO1B were cleaved by miR168 in tomato. In this study, we show that SlAGO1A and SlAGO1B accumulate in miR168-sponge transgenic plants, and that expression of miR168-resistant SlAGO1A (4m-SlAGO1A) and SlAGO1B (4m-SlAGO1B) in tomato results in a series of defects affecting growth rate, floral timing, leaves, and fruit. Accumulation of miR156 was found when 4m-SlAGO1A was at an early developmental stage compared to the wild type and original SlAGO1A transgenic plants, and miR172 was highly expressed in adult 4m-SlAGO1A compared to the controls. In addition, the expression of multiple small RNAs was altered in 4m-SlAGO1A. Taken together, our data provide novel insights into the interaction between SlAGO1s and miR168 in determining growth rate, phase change, leaf epinasty, fruit initiation and expansion, and other developmental processes in tomato. [ABSTRACT FROM AUTHOR]

During vegetative and embryonic developmental transitions, plant cells are massively reorganized to support the activities that will take place during the subsequent developmental phase. Studying cellular and subcellular changes that occur during these short transitional periods can sometimes present challenges, especially when dealing with Arabidopsis thaliana embryo and seed tissues. As a complementary approach, cellular reprogramming can be used as a tool to study these cellular changes in another, more easily accessible, tissue type. To reprogram cells, genetic manipulation of particular regulatory factors that play critical roles in establishing or repressing the seed developmental program can be used to bring about a change of cell fate. During different developmental phases, vacuoles assume different functions and morphologies to respond to the changing needs of the cell. Lytic vacuoles (LVs) and protein storage vacuoles (PSVs) are the two main vacuole types found in flowering plants such as Arabidopsis. Although both are morphologically distinct and carry out unique functions, they also share some similar activities. As the co-existence of the two vacuole types is short-lived in plant cells, how they replace each other has been a long-standing curiosity. To study the LV to PSV transition, LEAFY COTYLEDON2, a key transcriptional regulator of seed development, was overexpressed in vegetative cells to activate the seed developmental program. At the cellular level, Arabidopsis leaf LVs were observed to convert to PSV-like organelles. This presents the opportunity for further research to elucidate the mechanism of LV to PSV transitions. Overall, this example demonstrates the potential usefulness of cellular reprogramming as a method to study cellular processes that occur during developmental transitions. [ABSTRACT FROM AUTHOR]

An 11-month longitudinal study (T1:N = 520,Mage= 19 years) investigated the role of gender-related self-concept and goal clarity during the transition period surrounding graduation from upper secondary school in Switzerland. The first assessment took place a few months before graduation and assessed participants' gender-related self-concept (instrumentality, expressivity), gender-role attitudes, goal clarity, and job-related aspirations. Despite the high level of education, gender-related differences in attitudes and self-concept showed that boys endorsed more traditional gender-role attitudes than girls. Relationships between gender-related self-concept and attitudes showed different patterns for girls and boys. Regarding adaptation to the transition, gender-related self-concept predicted change in career-related goal clarity, which, in turn, predicted an increase in life satisfaction over time. Our results highlight the important role of instrumentality, expressivity, and career-related goal clarity during the transition of graduating from high school. [ABSTRACT FROM AUTHOR]

The present research focuses on 2 factors that might help or hurt women to cope with the uncertainties associated with developmental transitions in modern societies (i.e., starting one's first job, graduating from high school, reentry to work after parental leave). We investigate (a) the role of openness to experience in coping with challenging transitions and (b) the (mal)adaptive consequences of adopting a traditional gender ideology. Starting with the assumption that transitional uncertainty has different consequences for women high or low in openness to experience, a first experiment (Af = 61; 18-30 years) demonstrated that self-efficacy and well-being decrease after being confronted with transitional uncertainty among women low in openness. Two longitudinal studies investigated the (mal)adaptive consequences of adopting a traditional gender ideology for women high or low in openness in dealing with challenging transitions. Study 2 examined whether endorsing or rejecting traditional gender role beliefs might help female (but not male) students to maintain a sense of self-efficacy and subjective well-being during the transition of graduating from high school (N = 520, 17-22 years). Study 3 (N = 297; 20-53 years) tested the same model for women in middle adulthood during the transition from parental leave to reentry into work life. For both studies, latent growth analyses showed that endorsing traditional gender role beliefs contributed to self-efficacy and subjective well-being among women low in openness. By contrast, for women high in openness, rejecting traditional gender role beliefs had a positive effect on their relative level of self-efficacy and subjective well-being. Functions of ideologies in the context of challenging transitions are discussed. [ABSTRACT FROM AUTHOR]

PICKLE ( PKL) codes for a CHD3 chromatin remodeling factor that plays multiple roles in Arabidopsis growth and development. Previous analysis of the expression of genes that exhibit PKL-dependent regulation suggested that PKL acts during germination to repress expression of embryonic traits. In this study, we examined the expression of PKL protein to investigate when and where PKL acts to regulate development. A PKL:eGFP translational fusion is preferentially localized in the nucleus of cells, consistent with the proposed role for PKL as a chromatin remodeling factor. A steroid-inducible version of PKL [a fusion of PKL to the glucocorticoid receptor (PKL:GR)] was used to examine when PKL acts to repress expression of embryonic traits. We found that activation of PKL:GR during germination was sufficient to repress expression of embryonic traits in the primary roots of pkl seedlings, whereas activation of PKL:GR after germination had little effect. In contrast, we observed that PKL is required continuously after germination to repress expression of PHERES1, a type I MADS box gene that is normally expressed during early embryogenesis in wild-type plants. Thus, PKL acts at multiple points during development to regulate patterns of gene expression in Arabidopsis. [ABSTRACT FROM AUTHOR]

Mark Tappan (2005) utilizes the autobiography of Malcolm X to exemplify how dialogical processes such as `ideological becoming' act on the development of identity considering at the same time the role of sociocultural dynamics of domination and subordination. Concentrating on this dialogical process, I seek to help its interpretation with a focus that emphasizes the necessity of studying the processes tied to the transitions of development and turning points, situating the `ideological becoming' process within a larger model which, in my opinion differentiates more clearly the different experiential aspects that can be implicated in the development of a new identity At the same time I use elements of the autobiography of Malcolm X to illustrate these processes. [ABSTRACT FROM AUTHOR]

Between 10 and 24 months of age, children progress from communicating through conventional signals to communicating through symbols in a variety of situations. The present study investigates this transition analysing mother–child communication frames and the child's communicative acts, and tracing the developmental changes in both frames and communicative acts. Four children (2 girls, 2 boys) and their mothers were observed longitudinally and extensively, from 10 to 24 months of age, using a multiple case-study method. Through the detailed investigation of these single cases, clear developmental rajectories were found, showing that conventional frames and representational gestures ‘bridge’ the transition from attentional to symbolic communication. There were significant differences between dyads and children in the developmental trajectories for several frames and communicative acts. The results not only confirm previous findings on the development of verbal and gestural communication, but provide new insights into the transition to symbolic communication in the second year of life, first because of the use of frame analysis and second because of a focus on individual trajectories in development. Copyright © 2003 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Across cultures, the majority of individuals will have a sibling relationship in their lifetime. Of particular importance to parents and children is the transition to siblinghood, which refers to the process wherein a child becomes a sibling. Although many parents are concerned about how their children will adjust during the transition to siblinghood, scant empirical work on this subject exists. Available empirical work on the transition to siblinghood has stemmed from developmental psychology; however, social work researchers have yet to deeply explore this body of work. The transition to siblinghood is a topic that is rife with opportunity for social work researchers, who have the ability to study this transition from culturally sensitive, person-in-environment, and social justice perspectives. This article provides an overview of the elements and importance of the transition to siblinghood, introduces a theoretical framework relevant to social workers, reviews existent empirical work on the transition to siblinghood, and elucidates limitations in the literature that social work researchers are adept to address. The article concludes with four recommendations to researchers who are interested in studying the transition to siblinghood through a social work lens., (© 2022 National Association of Social Workers.)