Disentangling structural genomic and behavioural barriers in a sea of connectivity.

Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversions act as an important mechanism maintaining isolating barriers, yet their role in sympatric populations and divergence with gene flow is not entirely understood.

Changes in posttraumatic stress symptoms, cognitions, and depression during treatment of traumatized youth.

Objective: Although there is compelling evidence that trauma-focused cognitive behavioral therapy (TF-CBT) is an effective treatment for traumatized youth, we know less about the mechanisms contributing to symptom reduction. To improve the understanding of change mechanisms in TF-CBT, this paper investigates the possible bi-directional longitudinal relationship between changes in posttraumatic stress symptoms (PTSS), cognitions and depression in a clinical sample of traumatized youth.

Methods: The study includes 79 youth (M age = 15.