RT Journal Article
SR Electronic
T1 Multimetric structural covariance in first-episode major depressive disorder: a graph theoretical analysis
JF Journal of Psychiatry and Neuroscience
JO JPN
FD Canadian Medical Association
SP E176
OP E185
DO 10.1503/jpn.210204
VO 47
IS 3
A1 Chujun Chen
A1 Zhening Liu
A1 Chang Xi
A1 Wenjian Tan
A1 Zebin Fan
A1 Yixin Cheng
A1 Jun Yang
A1 Lena Palaniyappan
A1 Jie Yang
YR 2022
UL http://jpn.ca/content/47/3/E176.abstract
AB Background: Abnormalities of cortical morphology have been consistently reported in major depressive disorder (MDD), with widespread focal alterations in cortical thickness, surface area and gyrification. However, it is unclear whether these distributed focal changes disrupt the system-level architecture (topology) of brain morphology in MDD. If present, such a topological disruption might explain the mechanisms that underlie altered cortical morphology in MDD.Methods: Seventy-six patients with first-episode MDD (33 male, 43 female) and 66 healthy controls (32 male, 34 female) underwent structural MRI scans. We calculated cortical indices, including cortical thickness, surface area and local gyrification index, using FreeSurfer. We constructed morphological covariance networks using the 3 cortical indices separately, and we analyzed the topological properties of these group-level morphological covariance networks using graph theoretical approaches.Results: Topological differences between patients with first-episode MDD and healthy controls were restricted to the thickness-based network. We found a significant decrease in global efficiency but an increase in local efficiency of the left superior frontal gyrus and the right paracentral lobule in patients with first-episode MDD. When we simulated targeted lesions affecting the most highly connected nodes, the thickness-based networks in patients with first-episode MDD disintegrated more rapidly than those in healthy controls.Limitations: Our sample of patients with first-episode MDD has limited generalizability to patients with chronic and recurrent MDD.Conclusion: A systems-level disruption in cortical thickness (but not surface area or gyrification) occurs in patients with first-episode MDD.