Is Depression/Annnxiety from the Bullshit You Experience or are You Prone to it?

[Aroura]

Also, this is for a specific personality disorder (sadly...mine), but ALL the class B ones seem to have this new information emerging, that they are more genetic than previously thought.



BPD article

Genetic Studies
There is substantial scientific evidence that BPD is highly heritable—a finding that suggests that brain abnormalities of this disorder are a consequence of genes involved in brain development (similar to what is known about schizophrenia, bipolar disorder, and autism).
A systematic review of the heritabil­ity of BPD examined 59 published stud­ies that were categorized into 12 family studies, 18 twin studies, 24 association studies, and 5 gene-environment inter­action studies.3 The authors concluded that BPD has a strong genetic compo­nent, although there also is evidence of gene-environment (G.E) interactions (ie, how nature and nurture influence each other).
The G.E interaction model appears to be consistent with the theory that ex­pression of plasticity genes is modified by childhood experiences and environ­ment, such as physical or sexual abuse. Some studies have found evidence of hypermethylation in BPD, which can ex­ert epigenetic effects. Childhood abuse might, therefore, disrupt certain neuro­plasticity genes, culminating in morpho­logical, neurochemical, metabolic, and white-matter aberrations—leading to pathological behavioral patterns identi­fied as BPD.

Looking into anything regarding the Class B Personality disorders, and you'll see similar findings.

It used to be thought that only class A were very heritable, so these are all relatively new findings.  But over 100 studies done all back each other up.