Interactions between ABC gene polymorphisms and processing speed in predicting depression severity.

Area of Science:

• Genetics
• Neuroscience
• Psychiatry

Background:

• ATP-binding cassette (ABC) family genes are implicated in substance transport and have associations with major depressive disorder (MDD).
• The precise clinical significance of ABC family genes in MDD, particularly concerning cognitive function and depression severity, remains largely undetermined.
• This research addresses the need to clarify the role of ABC genes in the complex interplay between genetics, cognition, and depression.

Purpose of the Study:

• To investigate the association between ABC family gene variants and cognitive function in patients with MDD.
• To examine the combined effects of ABC family genes and cognitive function on the severity of depression.
• To identify potential genetic markers for MDD.

Main Methods:

• Employed linear and logistic regression models to analyze data from 805 MDD patients and 1493 healthy controls (HCs).
• Focused on seven single nucleotide polymorphisms (SNPs) in ABCB1 and ABCB6 genes: rs28401781, rs4148739, rs3747802, rs1109866, rs1109867, rs3731885, and rs3755047.
• Assessed cognitive functions using standardized tests: Wisconsin Card Sorting Test (WCST), Tower of Hanoi Test (TOH), Trail Making Test (TMT), and Verbal Fluency Test (VF).

Main Results:

• Significant differences in gene and genotype frequencies for rs1109866 and rs1109867 were found between MDD patients and HCs, even after correction.
• The SNPs rs28401781 and rs4148739 showed significant associations with performance on the Tower of Hanoi Test (TOH).
• A significant interaction between the SNPs rs1109866, rs1109867, and Trail Making Test (TMT) results was observed, influencing depression severity in MDD patients.

Conclusions:

• ABC family genes play a role in influencing depression severity, potentially mediated through their impact on cognitive functioning.
• The identified gene variants and their interaction with cognitive tests may serve as valuable genetic markers for major depressive disorder.
• Further research is warranted to elucidate the specific mechanisms underlying these genetic influences on depression and cognition.