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> The cells seem to differ in the anterior vs. the posterior regions:
> 
> https://medicalxpress.com/news/2021-05-difference-halves-hippocampus-gene.html
> 
> "'These new data reveal molecular-level differences that allow us to view the anterior and posterior hippocampus in a whole new way," says study leader Genevieve Konopka, Ph.D., associate professor of neuroscience at UTSW.
> 
> "She and study co-leader Bradley C. Lega, M.D., associate professor of neurological surgery, neurology, and psychiatry, explain that the human hippocampus is typically considered a uniform structure with key roles in memory, spatial navigation, and regulation of emotions. However, some research has suggested that the two ends of the hippocampus—the anterior, which points downward toward the face, and the posterior, which points upward toward the back of the head—take on different jobs.
> 
> "Scientists have speculated that the anterior hippocampus might be more important for emotion and mood, while the posterior hippocampus might be more important for cognition. However, says Konopka, a Jon Heighten Scholar in Autism Research, researchers had yet to explore whether differences in gene activity exist between these two halves.
> 
> "For the study, Konopka and Lega, both members of the Peter O'Donnell Jr. Brain Institute, and their colleagues isolated samples of both the anterior and posterior hippocampus from five patients who had the structure removed to treat epilepsy. Seizures often originate from the hippocampus, explains Lega, who performed the surgeries. Although brain abnormalities trigger these seizures, microscopic analysis suggested that the tissues used in this study were anatomically normal.
> 
> "After removal, the samples underwent single nuclei RNA sequencing (snRNA-seq), which assesses gene activity in individual cells. Although snRNA-seq showed mostly the same types of neurons and support cells reside in both sections of the hippocampus, activity of specific genes in excitatory neurons—those that stimulate other neurons to fire—varied significantly between the anterior and the posterior portions of the hippocampus. When the researchers compared this set of genes to a list of genes associated with psychiatric and neurological disorders, they found significant matches. Genes associated with mood disorders, such as major depressive disorder or bipolar disorder, tended to be more active in the anterior hippocampus; conversely, genes associated with cognitive disorders, such as autism spectrum disorder, tended to be more active in the posterior hippocampus.
> 
> ***
> 
> "'The idea that the anterior and posterior hippocampus represent two distinct functional structures is not completely new, but it's been underappreciated in clinical medicine," he says. "When trying to understand disease processes, we have to keep that in mind.'"
> 
> Comment: Isolating regions with specific functions in the brain is not usual research. Removal of one hippocampus can result in memory and visual problems:
> 
> "Of 376 patients who had the amygdalohippocampectomy procedure performed, compared to other types of temporal lobe resections, two thirds of this population were reported free of disabling seizures.[5] Some patients report defects in visual perception[6] and impaired memory function.[7]"
> 
> https://en.wikipedia.org/wiki/Amygdalohippocampectomy
> 
> Comment: How much trouble from the surgery may depend upon which hemisphere is dominant.