Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling by array of microsatellite stable stage III Colorectal Adenocarcinoma (MSS-CRC) with wild type or mutant p53 to study the prognostic significance of the mutation

ABSTRACT: Clinical Significance: Understanding the differences in colorectal cancer (CRC) aggressiveness and clinical outcomes in relation to tumor stage and different molecular subsets is at most important for designing treatment regimens. However, molecular signatures for specific phenotypic subsets that predict the aggressiveness and clinical outcomes of CRC, specifically in advanced disease stage are lacking. Therefore, for the first time, the current study has identified a set of molecular markers that are associated with aggressive Stage III CRCs that exhibited microsatellite stable and mutant p53 phenotypic features. These findings might aid in designing aggressive treatment regimens and help to provide insights into the development of novel therapeutic targets. Results: Increased incidence of p53 mutations in MSS CRCs (58%) was associated with higher CRC-specific mortality than MSS-p53 wild-type phenotypes (log-rank, P=0.025; and hazard ratio, 2.52; 95% confidence interval, 1.25-5.08). Of 49 down-regulated genes, LPAR6, PDLIM3 and PLAT and of 35 up-regulated genes, TRIM29, FUT3, IQGAP3, and SLC6A8, were confirmed by qNPA, qRT-PCR, and IHC platforms. Conclusions: p53 mutations are associated with poor prognosis of Stage III microsatellite stable CRCs. p53 wild type vs. mutant tumor samples

ORGANISM(S): Homo sapiens

SUBMITTER: Dongquan Chen

PROVIDER: E-GEOD-27157 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Prognostic significance and gene expression profiles of p53 mutations in microsatellite-stable stage III colorectal adenocarcinomas.

Katkoori Venkat R VR Shanmugam Chandrakumar C Jia Xu X Vitta Swaroop P SP Sthanam Meenakshi M Callens Tom T Messiaen Ludwine L Chen Dongquan D Zhang Bin B Bumpers Harvey L HL Samuel Temesgen T Manne Upender U

PloS one 20120119 1

Although the prognostic value of p53 abnormalities in Stage III microsatellite stable (MSS) colorectal cancers (CRCs) is known, the gene expression profiles specific to the p53 status in the MSS background are not known. Therefore, the current investigation has focused on identification and validation of the gene expression profiles associated with p53 mutant phenotypes in MSS Stage III CRCs. Genomic DNA extracted from 135 formalin-fixed paraffin-embedded tissues, was analyzed for microsatellite ...[more]

PMID: 22276141

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Project description:Gene expression profiling in soybean under aluminum stress: Transcriptome response to Al stress in roots of Al-tolerant genotype (PI 416937). Aluminum (Al) toxicity is a major constraint of crop production on acid soils. Many commercial soybean cultivars and advanced breeding lines have been evaluated for Al tolerance. Aluminum tolerance is quantitatively inherited trait in soybean making it difficult for genetic improvement. Understanding the molecular and genetic mechanisms of tolerance is crucial for developing efficient and effective programs aimed at improving Al tolerance trait The molecular mechanisms of Al tolerance is poorly understood in soybean. The objective of the research was to identify candidate aluminum tolerance genes in soybean Al-tolerant soybean genotype PI 416937 seedlings were exposed to zero or 10 µM Al in growth chamber under hydroponic conditions for four time span of 2, 12, 48 and 72 hrs in a randomized complete block design with three replications. Microarray analysis was made on mRNA isolated from 1 cm log tap root tips using Affymetrix soybean array with over 68,000 probe sets Glycine max L and wild soybean combined. Both novel and known genes were discovered in response to Al treatment. They include Al tolerance relevant proteins, families of transcription factors, zinc finger, bZIP, WRKY, MYB, ADR6, and NAC domain proteins were induced likely regulating Al tolerance downstream genes. Stress related proteins, cytochrome P450, glutathione-s transferase, glutaredoxin family and ascorbic acid biosynthesis protein were induced as signatures of cellular detoxification mechanisms. An ABC type multidrug resistance protein that could act as citrate transporter or Al exporter was up-regulated, a key Al tolerance mechanisms in several species. A cell wall loosening enzyme endoxylglucan hydrolases were also up-regulated probably reversing the wall rigidification caused by Al and promoting root growth under Al stress. Phytosulfokines growth factor involved in cell division and proliferation was up-regulated likely as a direct counter action to Al toxicity which inhibits root growth by limiting cell division and elongation. In conclusion, the Al tolerance candidate genes identified herein are potential targets for future genetic engineering and molecular breeding work on Al tolerance trait in soybean which in turn would contribute to gain in soybean productivity on acid soils. One genotype PI 416937 (p); four time points: (2, 12, 48, and 72 hrs), with replicates (2 or 3)

Dataset Information

Transcription profiling by array of microsatellite stable stage III Colorectal Adenocarcinoma (MSS-CRC) with wild type or mutant p53 to study the prognostic significance of the mutation

Publications

Prognostic significance and gene expression profiles of p53 mutations in microsatellite-stable stage III colorectal adenocarcinomas.

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