Examining feasibility, acceptability, and participant experiences of an anti-racist parenting intervention for White U.S. parents

Many White parents engage in minimal discussion of race and racism with their children, instead engaging in color-evasive practices that communicate that race is unimportant and that White people are racially neutral. Even White parents who express a commitment to anti-racist parenting frequently struggle to act on this commitment and feel underprepared to do so. The current mixed methods pilot study focused on the feasibility, acceptability, and participant experiences of an intervention ("CounterACT") that aimed to address this gap in White U.S.-based parents' skills and knowledge. Participants in the study were 27 White U.S.-based parents of 4- to 6-year-old White children who completed pre- and postintervention surveys as well as postintervention interviews. Findings suggest that the CounterACT model was feasible and acceptable. Parent self-report further suggests that CounterACT had beneficial effects on parenting, parents' beliefs regarding White privilege, and children's critical reflection. Parents reported positive experiences of CounterACT, particularly group components of the intervention. Key elements of participants' experience included learning to understand their own and their children's experience of Whiteness; learning to better tolerate and regulate emotional discomfort; connecting with others for motivation, accountability, and learning; and approaching racial socialization with greater intentionality. However, parents also experienced limits in their progress toward anti-racist parenting. Many indicated a desire for more concrete guidance and greater support enacting what they were learning in their own parenting. A particular concern was how to discuss White racial identities effectively. Our discussion highlights the implications of these findings for future work in this area. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Field Evidence of Mosquito Population Regulation by a Gregarine Parasite

Although parasites are by definition costly to their host, demonstrating that a parasite is regulating its host abundance in the field can be difficult. Here we present an example of a gregarine parasite, Ascogregarina taiwanensis Lien and Levine (Apicomplexa: Lecudinidae), regulating its mosquito host, Aedes albopictus Skuse (Diptera: Culicidae), in Bermuda. We sampled larvae from container habitats over 2 yr, assessed parasite prevalence, and estimated host abundance from egg counts obtained in neighboring ovitraps. We regressed change in average egg count from 1 yr to the next on parasite prevalence and found a significant negative effect of parasite prevalence. We found no evidence of host density affecting parasite prevalence. Our results demonstrate that even for a parasite with moderate virulence, host regulation can occur in the field.

An Angelman syndrome substitution in the HECT E3 ubiquitin ligase C-terminal Lobe of E6AP affects protein stability and activity

Angelman syndrome (AS) is a rare neurodevelopmental disorder characterized by speech impairment, intellectual disability, ataxia, and epilepsy. AS is caused by mutations in the maternal copy of UBE3A located on chromosome 15q11-13. UBE3A codes for E6AP (E6 Associated Protein), a prominent member of the HECT (Homologous to E6AP C-Terminus) E3 ubiquitin ligase family. E6AP catalyzes the posttranslational attachment of ubiquitin via its HECT domain onto various intracellular target proteins to regulate DNA repair and cell cycle progression. The HECT domain consists of an N-lobe, required for E2~ubiquitin recruitment, while the C-lobe contains the conserved catalytic cysteine required for ubiquitin transfer. Previous genetic studies of AS patients have identified point mutations in UBE3A that result in amino acid substitutions or premature termination during translation. An AS transversion mutation (codon change from ATA to AAA) within the region of the gene that codes for the catalytic HECT domain of E6AP has been annotated (I827K), but the molecular basis for this loss of function substitution remained elusive. Here, we demonstrate that the I827K substitution destabilizes the 3D fold causing protein aggregation of the C-terminal lobe of E6AP using a combination of spectropolarimetry and nuclear magnetic resonance (NMR) spectroscopy. Our fluorescent ubiquitin activity assays with E6AP-I827K show decreased ubiquitin thiolester formation and ubiquitin discharge. Using 3D models in combination with our biochemical and biophysical results, we rationalize why the I827K disrupts E6AP-dependent ubiquitylation. This work provides new insight into the E6AP mechanism and how its malfunction can be linked to the AS phenotype.