Here are half a dozen papers with anxiety relevance.  The first couple are about the interaction between genetic vulnerability (or resilience) and childhood experience.  The Stevens et al paper is an update on the large body of research looking at psychological genetic vulnerability/resilience in macaque monkeys and how this interacts with parenting quality to lead, or not lead, to emotional and neurophysiological disturbances in adulthood.  The Battaglia paper particularises this gene/environment investigation by looking at the connections between early human childhood separation anxiety, loss of a parent, and panic disorder in adulthood.