“…Firstly, microsatellites related to behavior-related genes had a variable repeat size (or number) and affected behavioral characteristics in dog breeds (Takeuchi et al, 2009a(Takeuchi et al, , 2009bKonno et al, 2011), and could also interact with SNPs in the regulation of transcription (Chen et al, 2013). Secondly, VNTRs of the dopaminergic neurotransmitter genes such as DRD4, TH, DBH, and DAT were reviewed in dogs (Hejjas et al, 2007(Hejjas et al, , 2009, and a repeat polymorphism of the TH gene was related to behavioral tests (Kubinyi et al, 2012).…”