Systematic Analysis of Gene Expression and Molecular Interactions in Cardiac and non-cardiac Gastric Carcinomas
HEPATO-GASTROENTEROLOGY
Authors: Ju, Fang; Lu, Lin; Zhao, Qing-ye; Du, Guo-wei; Yuan, Hai-cheng; Yu, Jin-ming
Abstract
Background/Aims: This study aims to comparing the gene expression profiles and molecular interactions among gastric cardiac adenocarcinomas (GCA), gastric noncardiac adenocarcinomas (GNCA) and their adjacent normal tissues. Methodology: Gene expression profile of GSE29272 was downloaded from Gene expression omnibus. Differentially expressed genes (DEGs) were identified at the cut-off of p-value <= 0.01. Gene ontology (GO) enrichment analysis was further performed for the DEGs, and then the binding sites of the transcriptional factors and the specific protein-protein interactions were analyzed. Results: Total 1024 DEGs were screened, including 741 up-regulated genes and 283 down-regulated genes. VSNL1 (visinin-like protein-1) is expressed relatively higher in the GNCA and could be its molecular biomarker, as KRT14 (cytokeratin 14) in the GCA. GO analysis showed that the analogous cancer-relevant factors network appears in these two cancer subgroups. The DEGs in the GCA tend to be bound by SPIB and ZNF354C. FN1 lies in the center of the protein-protein interaction networks of the two cancer subgroups. Conclusions: We found out the RNA expression level of the two gastric cancers varied greatly from the normal tissues while gene expression profile of them were very similar, however, the different biomarker and transcriptional factors indicate the differences of two mechanisms.
Comprehensive spatiotemporal transcriptomic analyses of the ganglionic eminences demonstrate the uniqueness of its caudal subdivision
MOLECULAR AND CELLULAR NEUROSCIENCE
Authors: Willi-Monnerat, Susan; Migliavacca, Eugenia; Surdez, Didier; Delorenzi, Mauro; Luthi-Carter, Ruth; Terskikh, Alexey V.
Abstract
The elucidation of mechanisms underlying telencephalic neural development has been limited by the lack of knowledge regarding the molecular and cellular aspects of the ganglionic eminence (GE), an embryonic structure that supplies the brain with diverse sets of GABAergic neurons. Here, we report a comprehensive transcriptomic analysis of this structure including its medial (MGE), lateral (LGE) and caudal (CGE) subdivisions and its temporal dynamics in 12.5 to 16 day-old rat embryos. Surprisingly, comparison across subdivisions showed that CGE gene expression was the most unique providing unbiased genetic evidence for its differentiation from MGE and LGE. The molecular signature of the CGE comprised a large set of genes, including Rwdd3, Cyp26b1, Nr2f2, Egr3, Cpta1, Slit3, and Hod, of which several encode cell signaling and migration molecules such as WNT5A, DOCK9, VSNL1 and PRG1. Temporal analysis of the MGE revealed differential expression of unique sets of cell specification and migration genes, with early expression of Hes1, Lhx2, Ctgf and Mdk, and late enrichment of Olfm3, SerpinE2 and Wdr44. These GE profiles reveal new candidate regulators of spatiotemporally governed GABAergic neuronogenesis. (c) 2008 Elsevier Inc. All rights reserved.