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1. Severe drought exposure in utero associates to children’s epigenetic age acceleration in a global climate change hot spot

   https://doi.org/10.1038/s41467-024-48426-7  

   Qiao, Xi ; Straight, Bilinda ; Ngo, Duy ; Hilton, Charles E ; Owuor_Olungah, Charles ; Naugle, Amy ; Lalancette, Claudia ; Needham, Belinda L ( May 2024 , Nature Communications)

   The goal of this study is to examine the association between in utero drought exposure and epigenetic age acceleration (EAA) in a global climate change hot spot. Calculations of EAA in adults using DNA methylation have been found to accurately predict chronic disease and longevity. However, fewer studies have examined EAA in children, and drought exposure in utero has not been investigated. Additionally, studies of EAA in low-income countries with diverse populations are rare. We assess EAA using epigenetic clocks and two DNAm-based pace-of-aging measurements from whole saliva samples in 104 drought-exposed children and 109 same-sex sibling controls in northern Kenya. We find a positive association between in utero drought exposure and EAA in two epigenetic clocks (Hannum’s and GrimAge) and a negative association in the DNAm based telomere length (DNAmTL) clock. The combined impact of drought’s multiple deleterious stressors may reduce overall life expectancy through accelerated epigenetic aging.

    

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2. Maternal reactions to children’s negative emotions: Relations to children's socio-emotional development among European American and Chinese immigrant children

   https://doi.org/10.1177/1363461520905997  

   Yang, Yang ; Song, Qingfang ; Doan, Stacey N. ; Wang, Qi ( February 2020 , Transcultural Psychiatry)

   This study examined the relations between maternal reactions to children’s negative emotions and children’s socio-emotional outcomes, including psychological adjustment, emotion knowledge, and coping strategies. European American and Chinese immigrant mothers reported on their reactions to children’s ( N = 117, M = 7.14 years) negative emotions and on children’s psychological adjustment. One year later, children were interviewed for emotion knowledge and mothers reported on children’s use of coping strategies. Mothers from the two cultural groups reported the same level of supportive reactions to their children’s negative emotions, whereas Chinese immigrant mothers more often adopted what are commonly considered to be non-supportive strategies than did European American mothers. Whereas supportive maternal reactions were associated with better child outcomes in both cultures, maternal non-supportive reactions were negatively associated with children’s functioning for European American children but not for Chinese immigrant children. The findings shed critical light on the functional meaning of parenting practices in specific cultural contexts in shaping developmental outcomes.

    

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3. Explaining Income Disparities in Young Children’s Development: The Role of Community Contexts and Family Processes

   Coley, R. L. ( January 2019 , Early childhood research quarterly)

   null (Ed.)

   Growing economic disparities and the increased sorting of families into economically segregated communities have heightened the need to clearly delineate pathways through which family income promotes children’s development. Combining hypotheses from investment and stress theories, we developed and tested a multi-context and cross-domain conceptual model assessing how community and family contexts mediate links between family income and children’s cognitive and behavioral skills at kindergarten entry. We drew data on family income, parenting processes, and child functioning from the Early Childhood Longitudinal Study– Birth Cohort (ECLS-B; N ≈ 10,650), following children from infancy through age 5. We used Geographic Information Systems technology to create and validate community measures using administrative data from the Economic Census, Decennial Census, National Center of Education Statistics, Federal Bureau of Investigations, and Environmental Protection Agency, which were then linked to each child in the ECLS-B. Using structural equation modeling, our analyses revealed three primary lessons. First, lower-income children have limited access to community educational and cultural resources and heightened exposure to community stressors including concentrated disadvantage and violent crime. Second, these community features are associated with parenting processes, such that parent-child interactions tend to be less stimulating and supportive and more punitive in communities with fewer resources and heightened stressors. And third, community and family contexts together mediate connections between family income and children’s cognitive and behavioral functioning. Results, albeit showing small effect sizes, provide a more complex, multi-contextual view than prior research, delineating the role of both resources and stressors at community and family levels in explaining income disparities in young children’s developmental success. 

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4. Associations between prenatal substance exposure, prenatal violence victimization, unintended pregnancy, and trauma exposure in childhood in a clinical setting

   https://doi.org/10.1002/imhj.21815  

   Cohodes, Emily M. ; Gee, Dylan G. ; Lieberman, Alicia F. ( September 2019 , Infant Mental Health Journal)

   Given the importance of early prevention and intervention strategies for children exposed to trauma, detection of early risk factors for exposure to traumatic events in childhood is critical. The present study examined associations between three known prenatal risk factors that characterize environmental instability in utero—prenatal substance exposure, prenatal violence victimization, and unintended pregnancy—and child exposure to interparental violence and other adverse experiences in a sample of 198 mother–child dyads (Mchild age = 44.48 months) referred to a hospital clinic for treatment following exposure to trauma. Prenatal substance and violence exposure were associated with child trauma exposure, and prenatal violence victimization was also associated with maternal severity ratings of traumatic exposures. Unintended pregnancy was not associated with child trauma exposure or severity. These findings expand our understanding of prenatal risk factors for trauma exposure in childhood and, specifically, highlight prenatal substance exposure and violence victimization as risk factors for subsequent exposure to trauma in early childhood. Results suggest that prenatal prevention and intervention programs should target reducing maternal substance use and in‐utero exposure to violence.

    

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5. Local groundwater decline exacerbates response of dryland riparian woodlands to climatic drought

   https://doi.org/10.1111/gcb.16376  

   Williams, Jared ; Stella, John C. ; Voelker, Steven L. ; Lambert, Adam M. ; Pelletier, Lissa M. ; Drake, John E. ; Friedman, Jonathan M. ; Roberts, Dar A. ; Singer, Michael Bliss ( January 2022 , Global Change Biology)

   Dryland riparian woodlands are considered to be locally buffered from droughts by shallow and stable groundwater levels. However, climate change is causing more frequent and severe drought events, accompanied by warmer temperatures, collectively threatening the persistence of these groundwater dependent ecosystems through a combination of increasing evaporative demand and decreasing groundwater supply. We conducted a dendro-isotopic analysis of radial growth and seasonal (semi-annual) carbon isotope discrimination (Δ13C) to investigate the response of riparian cottonwood stands to the unprecedented California-wide drought from 2012 to 2019, along the largest remaining free-flowing river in Southern California. Our goals were to identify principal drivers and indicators of drought stress for dryland riparian woodlands, determine their thresholds of tolerance to hydroclimatic stressors, and ultimately assess their vulnerability to climate change. Riparian trees were highly responsive to drought conditions along the river, exhibiting suppressed growth and strong stomatal closure (inferred from reduced Δ13C) during peak drought years. However, patterns of radial growth and Δ13C were quite variable among sites that differed in climatic conditions and rate of groundwater decline. We show that the rate of groundwater decline, as opposed to climate factors, was the primary driver of site differences in drought stress, and trees showed greater sensitivity to temperature at sites subjected to faster groundwater decline. Across sites, higher correlation between radial growth and Δ13C for individual trees, and higher inter-correlation of Δ13C among trees were indicative of greater drought stress. Trees showed a threshold of tolerance to groundwater decline at 0.5 m year−1 beyond which drought stress became increasingly evident and severe. For sites that exceeded this threshold, peak physiological stress occurred when total groundwater recession exceeded 3 m. These findings indicate that drought-induced groundwater decline associated with more extreme droughts is a primary threat to dryland riparian woodlands and increases their susceptibility to projected warmer temperatures. 

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