Association for psychological science: Comorbidity among mental disorders

Might there be a single, common factor predisposing a person to all types of psychopathology?  Referencing an article written by Caspi et al. in Clinical Psychological Science, March 2014.

http://www.psychologicalscience.org/index.php/publications/observer/obsonline/comorbidity-among-mental-disorders-a-new-approach.html