The transcriptome of rat hippocampal subfields

Purpose: In this study, we used LCM and RNA-Seq to characterize differences in the rat hippocampal expression profiles of CA1, CA2, CA3, and DG subfields Methods: Each subfield was bilaterally laser microdissected, collected from the rat's hippocampus (n=4), and submitted to Illuminas for massively parallel sequencing. Results: We found evident segregation of the transcriptomic profile from different regions of the hippocampus. Gene ontology enrichment analysis of CA1 subfield results in actin regulation genes and postsynaptic membrane AMPA receptors that are indispensable for long-term potentiation and learning and memory. CA2 and CA3 transcripts were found associated with the higher metabolic processes. DG expression was enriched for ribosome and spliceosome, both required for protein synthesis and maintenance of cell life. Conclusion: The present findings contribute to a deeper understanding of the differences in the molecular machinery expressed by the rat hippocampal neuronal populations, further exploring underlying mechanisms responsible for each subflied specific functions. Hippocampal subfield mRNA profiles of Wistar Rat

研究目的：本研究采用激光捕获显微切割（Laser Capture Microdissection, LCM）与RNA测序（RNA-Seq）技术，对大鼠海马CA1、CA2、CA3及DG亚区的基因表达谱差异进行表征。
实验方法：各亚区均通过双侧激光显微切割从大鼠海马中获取样本（n=4），随后送至Illumina平台开展大规模并行测序。
研究结果：本研究发现海马不同区域的转录组谱存在显著分化。对CA1亚区进行基因本体（Gene Ontology, GO）富集分析显示，其富集的基因包括肌动蛋白调控相关基因，以及长时程增强、学习记忆过程中不可或缺的突触后膜AMPA受体。研究发现CA2与CA3的转录本与高代谢活性过程密切相关。DG亚区的表达谱则富集了核糖体与剪接体相关基因，二者均为蛋白质合成及细胞生命维持所必需。
研究结论：本研究结果有助于更深入地理解大鼠海马神经元群体所表达的分子机制差异，进一步探索各亚区特异性功能背后的潜在调控机制。
Wistar大鼠海马亚区的mRNA表达谱