Multiple single-cell and transcriptomic studies confirm that distinct neural circuits and brain regions express unique patterns of genes and regulatory programs.
The claim posits that separate neural circuits express separate genes within the same general type of brain matter or tissue. Papers [1], [5], and [7] directly support this by showing that different neural circuits, nuclei, or neuronal subtypes display distinct gene expression profiles and transcriptional combinatorial codes. There is no contradictory evidence in the retrieved literature.