What role does genetic risk play in shaping the developmental patterns of depressive symptoms?

Last updated 21 October 2021
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Depression with onset during childhood or adolescence is associated with a worse course of illness than depression with onset during adulthood.1 However, the role of genetic factors in the risk for childhood or adolescent onset depression is unclear. Now, Alexandre Lussier and colleagues in the USA have examined developmental patterns of depressive symptoms and the influence of genetic factors.

Specifically, Lussier et al. examined the relationship between genetic risk for depression and depressive symptom trajectories in >7,000 youths involved in the Avon Longitudinal Study of Parents and Children across a 13-year period from childhood to adolescence — one of the longest periods studied to date. By constructing trajectories of depressive symptoms across development, Lussier et al. were able to classify youth into six classes: high/renitent (27.9%), high/reversing (9.1%), childhood decrease (7.3%), late childhood peak (3.3%), adolescent spike (2.5%), and minimal symptoms (49.9%).

“Fluctuations in symptoms between different ages may reflect environmental or learned coping mechanisms, rather than genetic risk”

Alexandre Lussier

“We found that genetic risk for depression can differentiate between youths with high or low symptoms during early-adolescence, highlighting a period when symptoms linked to genetic risk for depression may be more likely to emerge”, says Lussier. “What’s more, this association holds true regardless of age-associated patterns of responding (i.e., changes due to life events). This means that fluctuations in symptoms between different ages may reflect environmental or learned coping mechanisms, rather than genetic risk”.

Overall, it seems that genetic risk for depression might influence the trajectory of symptoms across development. Going forward, Lussier et al. hope that this finding will ultimately lead to the identification of the genetic risk factors that might help identify those at higher risk for early-onset depression. However, more research is needed to understand the environmental and biological mechanisms driving these depressive symptom trajectories.

Referring to

Lussier AA et al (2020). Genetic susceptibility for major depressive disorder associates with trajectories of depressive symptoms across childhood and adolescence. J Child Psychol Psychiatry, 62, 895–904.

References

  1. McLaughlin KA et al (2012). Childhood adversities and first onset of psychiatric disorders in a national sample of US adolescents. Arch Gen Psychiatry, 69, 1151–1160

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Dr Jessica Edwards
Jessica received her MA in Biological Sciences and her DPhil in Neurobehavioural Genetics from the University of Oxford (Magdalen College). After completing her post-doctoral research, she moved into scientific editing and publishing, first working for Spandidos Publications (London, UK) and then moving to Nature Publishing Group. Jessica is now a freelance editor and science writer, and started writing for “The Bridge” in December 2017.

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