Three-way interaction effects of early life stress, positive parenting and FKBP5 in the development of depressive symptoms in a general population

Genetic Variants Associated with Suicide Risk in the Mexican Population: A Systematic Literature Review

Suicide is defined as the action of harming oneself with the intention of dying. It is estimated that worldwide, one person dies by suicide every 40 s, making it a major health problem. Studies in families have suggested that suicide has a genetic component, so the search for genetic variants associated with suicidal behavior could be useful as potential biomarkers to identify people at risk of suicide. In Mexico, some studies of gene variants related to neurotransmission and other important pathways have been carried out and potential association of variants located in the following genes has been suggested: SLC6A4, SAT-1, TPH-2, ANKK1, GSHR, SCARA50, RGS10, STK33, COMT, and FKBP5. This systematic review shows the genetic studies conducted on the Mexican population. This article contributes by compiling the existing information on genetic variants and genes associated with suicidal behavior, in the future could be used as potential biomarkers to identify people at risk of suicide.

Role of FKBP5 and its genetic mutations in stress-induced psychiatric disorders: an opportunity for drug discovery

Stress-induced mental health disorders are affecting many people around the world. However, effective drug therapy for curing psychiatric diseases does not occur sufficiently. Many neurotransmitters, hormones, and mechanisms are essential in regulating the body's stress response. One of the most critical components of the stress response system is the hypothalamus-pituitary-adrenal (HPA) axis. The FKBP prolyl isomerase 51 (FKBP51) protein is one of the main negative regulators of the HPA axis. FKBP51 negatively regulates the cortisol effects (the end product of the HPA axis) by inhibiting the interaction between glucocorticoid receptors (GRs) and cortisol, causing reduced transcription of downstream cortisol molecules. By regulating cortisol effects, the FKBP51 protein can indirectly regulate the sensitivity of the HPA axis to stressors. Previous studies have indicated the influence of FKBP5 gene mutations and epigenetic changes in different psychiatric diseases and drug responses and recommended the FKBP51 protein as a drug target and a biomarker for psychological disorders. In this review, we attempted to discuss the effects of the FKBP5 gene, its mutations on different psychiatric diseases, and drugs affecting the FKBP5 gene.

Longitudinal relation between maladaptive parenting and nonsuicidal self-injury among Chinese early adolescents: The roles of internalizing symptoms and FKBP5 gene variation

BACKGROUND

While increasing research has effectively documented that maladaptive parenting is a significant risk factor for adolescent nonsuicidal self-injury, the process mechanism and gene-by-environment interaction in this relation among Chinese early adolescents are still poorly understood.

METHODS

In this study, a multi-informant longitudinal design was applied to investigate the indirect effect of internalizing symptoms in the relation between maladaptive parenting and nonsuicidal self-injury, and to examine how FKBP5 gene variation moderates these association. A total of 1718 Chinese Han early adolescents (44.30 % girls; M_age at Wave 1 = 10.35) and their parents participated this study.

RESULTS

The results showed that maladaptive parenting significantly predicts adolescent nonsuicidal self-injury after six months. Maladaptive parenting was also indirectly related to nonsuicidal self-injury via internalizing symptoms. Moreover, using a cumulative genetic score approach, the results showed that FKBP5 gene variation moderates the predictive effect of maladaptive parenting on internalizing symptoms and also moderates the indirect effect of internalizing symptoms between maladaptive parenting and nonsuicidal self-injury. These effects were more salient among adolescents with high (versus low) FKBP5 gene related cumulative genetic score linked to heightened stress reactivity.

LIMITATIONS

Our study only obtained two waves of data. Three waves of data would be more suitable for examining a mediation model.

CONCLUSION

This study reveals the process mechanism between maladaptive parenting and nonsuicidal self-injury and highlights the significance of gene-by-environment interaction to explain the emergence of nonsuicidal self-injury among adolescents.