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The aim of the present study was to investigate relationships between insertion/deletion ( I/D ) polymorphism at angiotensin-converting enzyme gene ( ACE ) and post-traumatic stress disorder (PTSD), as well as their interactions on blood pressure. Variants of  ACE I/D  were identified by polymerase chain reaction method and verified by DNA sequencing. PTSD symptoms were assessed by the PTSD Checklist-Civilian Version (PCL-C) based on DSM-IV-TR criteria among high school students at 6 months after the 2008 Wenchuan earthquake. Female subjects were found to have higher prevalence of PTSD and PCL-C scores than male counterparts in the II homozygotes ( p  = .038 for PTSD and  p  = .003 for PCL-C scores) and the ID heterozygotes ( p  = .000 for PTSD and  p  = .000 for PCL-C scores), but not in the DD homozygotes. Male subjects with the ID ( p  = .046) or the DD genotype ( p  = .039) had lower pulse pressure (PP) than the male II homozygotes, while the female II homozygotes had lower diastolic blood pressure (DBP) than the female DD homozygotes ( p  = .036).  ACE I/D , PTSD, or PCL-C scores, as well as gender and BMI, were found to be the predictors of PP. These results indicate that there are interactions of  ACE I/D  and PTSD, together with gender and BMI, on PP. This finding may be the additional explanation for the heterogeneous relationships between PTSD and blood pressure, and suggest psychiatry care and different medication strategies for patients with comorbidities of PTSD and hypertension and with different genotypes of  ACE I/D .

Insertion/deletion polymorphism at angiotensin-converting enzyme gene in PTSD individuals and their reciprocal effects on blood pressure