BDNF and Borderline personality disorder: Subjects: outpatients with BPD (n = 115, 108 female), HC (n = 52, 24 female). All patients received psychotropic medication. Diagnostics: DSM-IV, SCID-II, BDI-II, BHS, BIS-10, CTQ. Methods: intervention with I-DBT for 4 weeks. Methylation analysis of two CpG regions within BDNF exon 1 (9 CpG; chr11:27743473–27744564) and exon 4 (17 CpG; chr11:27723060–27723294). DNA bisulfite treatment, PCR amplification, methylation analysis by high-resolution melt assay. Quantizing BDNF plasma protein levels (ELISA).