Genetic association studies have implicated neural adhesion-related genes in suicidal behaviour and related psychiatric phenotypes, whereas postmortem brain transcriptomic studies have yielded heterogeneous findings with limited support after multiple-testing correction. We synthesized genetic evidence and examined IgLON expression in bilateral anterior midcingulate cortex (aMCC) samples from 14 suicide and 10 non-suicide donors. RT-qPCR measured eight transcripts from five IgLON genes, including alternative promoter-derived transcripts of LSAMP, NTM and OPCML. We additionally reanalysed published dorsolateral prefrontal cortex (DLPFC) expression data and examined public transcriptomic datasets. The genetic synthesis identified several adhesion-related candidate genes, while exploratory DLPFC reanalysis suggested potentially informative promoter-specific differences in LSAMP expression. In the aMCC, NEGR1 expression was lower in the right hemisphere of suicide donors (suicide/non-suicide ratio = 0.54; FDR-adjusted q = 0.027), but not significantly different in the left. Directional NEGR1 asymmetry also differed between groups (q = 0.026), although this result was sensitive to covariate adjustment and the scope of multiple-testing correction. Blood ethanol adjustment minimally changed effect estimates. No other aMCC transcript or public transcriptomic comparison showed FDR-significant differences. Our findings support anatomically focused, bilateral and transcript-specific investigation of neural adhesion genes in larger, independent cohorts.