Microcosm based bioremediation of AMD impacted soil
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA416924 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6320800.fastq.gz | Fastqsanger.gz | |||
| SRR6320920.fastq.gz | Fastqsanger.gz | |||
| SRR6320921.fastq.gz | Fastqsanger.gz | |||
| SRR6320602.fastq.gz | Fastqsanger.gz | |||
| SRR6320922.fastq.gz | Fastqsanger.gz |
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Project description:Age related macular degeneration (AMD) is one of the leading causes of irreversible central vision loss in the elderly population. According to the WHO estimates, AMD globally ranks third in causing vision impairment with a blindness prevalence of 8.7%.There is no cure for AMD; however,if it is diagnosed at an early stage, its progression can be slowed down by maintaining a healthy life style. Studies have been carried out to identify biomarkers in the plasma or serum of AMD patients. However, a consensus has not been reached with respect to an ideal biomarker which can predict and prognosticate the disease at an earlier stage. This can be attributed to the differences in the ethnicity and other geographical differences, which makes it important to conduct the study in specific regions.The current study aims to findnon-invasive prognostic biomarkers in the urine specimens of the AMD patients. Comparative proteomic analysis of urine samples from Early AMD, Choroidalneovascular membrane(CNVM) , Geographic atrophy(GA) and healthy controls was performed using Tandem mass tags (TMT) followed by mass spectrometry. Out of 751 proteins identified 383 proteins were found to be differentially expressed in various groups of AMD patients. Gene ontology classification of differentially expressed proteins revealed majority of them were involved in catalytic functions and binding activities. Pathway analysis showed, cell adhesion molecule pathways (CAMs), Complement and coagulation cascades, to be significantly deregulated in AMD. Upon validation by ELISA, SERPINA-1, TIMP-1, APOA-1 were significantly over expressed in AMD patients compared to the controls. A logistic model of APOA-1 in combination with CFH and C3 polymorphisms predicted the risk of developing AMD with 82% accuracy. This study gives us a preliminary data on non invasive biomarkers for AMD, which can be further validated in a large cohort and translated for diagnostic use.
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Project description:Hydrotalea sp. AMD isolate:AMD Genome sequencing and assembly
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Project description:Purpose: Age-related degeneration (AMD) is a major cause of blindness in developed countries. The molecular pathogenesis of early events in AMD is poorly understood. We investigated differential gene expression in samples of human retinal pigment epithelium (RPE)/choroid from early AMD and control maculas using exon-based arrays. Methods: Gene expression levels in nine early AMD and nine control human donor eyes were assessed using Affymetrix Human Exon ST 1.0 arrays. Two controls did not pass quality control and were removed. Differentially expressed genes were annotated using DAVID, and gene set enrichment analysis (GSEA) was performed on RPE-specific and endothelium-associated gene sets. CFH genotype was also assessed and differential expression was analyzed with respect to high AMD risk (YH/HH) and low AMD risk (YY) genotypes. Results: Seventy-five genes were identified as differentially expressed (raw p-value < 0.01; >50% fold change, mean log2 expression level in AMD or control M-bM-^IM-% median of all average gene expression values); however, no genes were significant (adj. p-value < 0.01) after correction for multiple hypothesis testing. Of 52 genes with decreased expression in AMD (fold change < 0.5; raw p-value < 0.01), 18 genes were identified by DAVID analysis as associated with vision or neurological processes. GSEA of RPE-associated and endothelium-associated genes revealed a significant decrease in genes typically expressed by endothelial cells in the early AMD group compared to controls, consistent with previous histologic and proteomic studies. Analysis with respect to CFH genotype indicated decreased expression of ADAMTS9 in eyes with high-risk genotypes (fold change = -2.61; raw p-value = 0.0008). Conclusions: GSEA results suggest that RPE transcripts are preserved or elevated in early AMD, concomitant with loss of endothelial cell marker expression. These results are consistent with the notion that choroidal endothelial cell dropout occurs early in the pathogenesis of AMD. Using AltAnalyze (ver. 2.0.7 beta), we analyzed nine early AMD and nine control eyes using Affymetrix Human Exon ST 1.0 arrays. Following initial processing in AltAnalyze, two control arrays were identified as potential outliers by tests implement in arrayQualityMetrics, a package for R.
2013-12-23 | E-GEOD-50195 | biostudies-arrayexpress
Project description:This SuperSeries is composed of the following subset Series: GSE17517: Microarray analysis of high Arctic soil bacterial response to hydrocarbon pollution and bioremediation GSE17532: RT-PCR analysis of high Arctic soil bacterial response to hydrocarbon pollution and bioremediation Refer to individual Series
2009-08-07 | E-GEOD-17533 | biostudies-arrayexpress
Project description:High Arctic soils have low nutrient availability, low moisture content and very low temperatures and, as such, they pose a particular problem in terms of hydrocarbon bioremediation. An in-depth knowledge of the microbiology involved in this process is likely to be crucial to understand and optimize the factors most influencing bioremediation. Here, we compared two distinct large-scale field bioremediation experiments, located at Alert (ex situ approach) and Eureka (in situ approach), in the Canadian high Arctic. Bacterial community structure and function were assessed using microarrays targeting the 16S rRNA genes of bacteria found in cold environments and hydrocarbon degradation genes as well as reverse-transcriptase real-time PCR targeting key functional genes. Results indicated a large difference between sampling sites in terms of both soil microbiology and decontamination rates. A rapid reorganization of the bacterial community structure and functional potential as well as rapid increases in the expression of alkane monooxygenases and polyaromatic hydrocarbon ring-hydroxylating-dioxygenases were observed one month after the bioremediation treatment commenced in the Alert soils. In contrast, no clear changes in community structure were observed in Eureka soils, while key gene expression increased after a relatively long lag period (1 year). Such discrepancies are likely caused by differences in bioremediation treatments (i.e. ex situ vs. in situ), weathering of the hydrocarbons, indigenous microbial communities, and environmental factors such as soil humidity and temperature. In addition, this study demonstrates the value of molecular tools for the monitoring of polar bacteria and their associated functions during bioremediation.
2009-08-07 | GSE17517 | GEO