(Title in Polish - 'Polimorfizm w genie transportera dopaminy (DAT 1) i postrzegalny stopien zagrozenia zycia a zaburzenie po stresie traumatycznym w grupie powodzian'). In this study thye authors examined possible associations between polymorphism in the dopamine transporter gene (DAT 1) and perceived threat of life and PTSD in the group of flood victims aged from 14 to 62. The participants of the study were asked to fill in two questionnaires measuring the intensity of PTSD symptoms. They were also asked to appraise the threat of life during traumatic event. The genotype of the participants were analyzed using PCR method. The authors demonstrated the association between perceived threat of life and the intensity of PTSD symptoms. Additionally, they showed the interaction between the DAT 1 genotype and perceived threat of life with respect to the intensity of PTSD symptoms.