A multicentre study on the epidemiology of perinatal depression was conducted among Japanese women expecting the first baby (N = 290). The incidence rate of the onset of the DSM-III-R Major Depressive Episode during pregnancy (antenatal depression) and within 3 months after delivery (postnatal depression) were 5.6% and 5.0%, respectively. Women with antenatal depression were characterised by young age and negative attitude towards the current pregnancy, whereas women with postnatal depression were characterised by poor accommodation, dissatisfaction with sex of the newborn baby and with the emotional undermining. Antenatal depression was a major risk factor for postnatal depression.

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Although an increasing number of studies show an association between adult attachment style and mood disorders, the relationship between adult attachment style and depression associated with childbirth is largely unknown. This study investigated the association between women's attachment style, postpartum depression (PPD), and other risk factors. During the 32nd week of pregnancy, 84 women were interviewed using the Attachment Style Interview. Participants also completed self-report questionnaires about reaction to pregnancy, family relationships, current life stresses, and symptoms of depression and anxiety. At one-month postpartum, they were evaluated for postpartum depressive symptoms using the Mini-International Neuropsychiatric Interview. Eighty-two women completed the second self-report questionnaires and were evaluated for PPD. The data of 76 women were eligible for analysis. PPD was present in 21%. An insecure attachment style was significantly related to depression. A multiple logistic regression analysis showed significant effects for insecure attachment, social economic status, and antenatal depression on PPD. Adding the insecure attachment style factor to the logistic model that predicted PPD increased the area under the curve to 0.87 (95% CI .77-.98; p < .05). The inclusion of attachment styles in assessments of perinatal depressive disorders could improve screening and the design of interventions.

Mechanisms for morphogenetic processes that generate complex patterns in a reproducible manner remain elusive. Live imaging provides a powerful tool to record cell behaviors. The appendicularian, Oikopleura dioica, is a planktonic tunicate that has a rapid developmental speed, small number of cells (less than 3500 cells in a juvenile), and a transparent body. The trunk epidermis, called the oikoplastic epithelium (OE), has elaborate cellular arrangements showing a complex pattern to secrete so-called "house" made of extracellular components. The OE is characterized by invariant number, size, and shape of the monolayer epithelial cells. Pattern formation is achieved during 5h of larval development without growth of the body, making this a suitable system for live imaging of a two-dimensional (2D) sheet. First, we subdivided the OE and defined several domains by cellular resolution, and systematically gave names to the constituent cells, since there is no variation among individuals. Time-lapse imaging of the epidermal cells revealed region-specific pattern formation processes. Each identified domain served as a compartment into which distribution of descendant cells of founder cells is restricted. Regulation of orientation, timing, and the number of rounds of cell divisions, but not cell death and migration, was a critical mechanism for determination of final cell arrangement and size. In addition, displacement of epithelial sheet plates was observed in the Eisen domain. Stem-cell-like cell divisions, whereby large mother stem cells generate a chain of small daughter cells, were involved in formation of the Nasse region and ventral sensory organ. These are the first examples of this kind of stem-cell-like cell division in deuterostomes. Furthermore, labeling of the left or right blastomere of the two-cell-stage embryo, which roughly gives rise to the left or right side of the body, respectively, revealed that the boundary of the descendant cells does not match with the midline of the trunk epidermis. Left and right descendants largely invade into the opposite side in an invariant way, suggesting the possibility that specification of the OE cell identities may occur later in development, most probably around hatching, and depending on cell position in the OE epithelial sheet. These detailed descriptions of OE patterning processes provide basic and essential information to analyze further cell behaviors in the generation of elaborate and intricate but stereotyped 2D cellular patterns in this advantageous model system for developmental and cell biological studies in chordates.

Larvaceans are chordates with a tadpole-like morphology. In contrast to most chordates of which early embryonic morphology is bilaterally symmetric and the left–right (L–R) axis is specified by the Nodal pathway later on, invariant L–R asymmetry emerges in four-cell embryos of larvaceans. The asymmetric cell arrangements exist through development of the tailbud. The tail thus twists 90° in a counterclockwise direction relative to the trunk, and the tail nerve cord localizes on the left side. Here, we demonstrate that larvacean embryos have nonconventional L–R asymmetries: 1) L- and R-cells of the two-cell embryo had remarkably asymmetric cell fates; 2) Ca2+ oscillation occurred through embryogenesis; 3) Nodal, an evolutionarily conserved left-determining gene, was absent in the genome; and 4) bone morphogenetic protein gene (Bmp) homolog Bmp.a showed right-sided expression in the tailbud and larvae. We also showed that Ca2+ oscillation is required for Bmp.a expression, and that BMP signaling suppresses ectopic expression of neural genes. These results indicate that there is a chordate species lacking Nodal that utilizes Ca2+ oscillation and Bmp.a for embryonic L–R patterning. The right-side Bmp.a expression may have arisen via cooption of conventional BMP signaling in order to restrict neural gene expression on the left side.

Defense styles have a close relationship with ego development and psychopathology. The purpose of the present paper was to examine the reliability and validity of the Japanese edition of the Defense Style Questionnaire (DSQ-40; Andrews et al. 1993). Six hundred and six Japanese university students (348 female) completed the DSQ-40 and Maudsley Personality Inventory (MPI). The neurotic tendency had positive correlations with immature and neurotic defense styles and a negative correlation with the mature defense style. The extroversion tendency had positive correlations with the mature and neurotic defense styles and a negative correlation with the immature defense style. There was a significant test-retest correlation for all items of the DSQ-40 (n = 284). The results show that the Japanese version of the DSQ-40 had concurrent validity with the MPI and a test-retest reliability of 2 months, although there was some doubt about the validity of the factor structure of the DSQ-40. Therefore, the DSQ-40 is a useful scale in Japan to measure ego development and ego function through defense styles.

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