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Homo sapiens

ABSTRACT: Ileal immune maturation in Pediatric Crohn's Disease

PROVIDER: PRJNA263476 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1609360.fastq.gz	Fastqsanger.gz
	SRR1609370.fastq.gz	Fastqsanger.gz
	SRR1609380.fastq.gz	Fastqsanger.gz
	SRR1609390.fastq.gz	Fastqsanger.gz
	SRR1609400.fastq.gz	Fastqsanger.gz

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Homo sapiens

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Transcriptomic profile of intestinal epithelial cells obtained from ileal endoscopic biopsies from newly-diagnosed, pediatric Crohn's disease patients and healthy controls.

Project description:Purpose: To uncover differentially-regulated transcripts and pathways/biological processes in newly-diagnosed, pediatric Crohn's disease in comparison to healthy controls. Methods: Intestinal epithelial cells were dissociated from ileal endoscopic biopsies, and stored at -80C in RNAlater. The polyA RNA fraction was purified, and single-end, 50 bp reads were sequenced and aligned to the Hg19 genome using the TopHat2 aligner. Differential analysis was performed using Bioconductor packages including edgeR, where significance was defined as p<0.05 and fold change>2. Results: We obtained 15788 reasonably-expressed transcripts that were included in differential analyses. Conclusions: Our study characterizes the dysregulation of intestinal epithelial cells in treatment-naïve Crohn's disease using RNA sequencing for transcriptomic profile of cells obtained through ileal endoscopic biopsies.

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Project description:Association between colonic level of microRNA 31 and subtypes of adult and pediatric Crohn's disease [pediatric]

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Developing biomarkers incorporating high throughput RNA, DNA, small RNA sequencing and protein expression in Inflammatory Bowel Disease using formalin-fixed, paraffin-embedded (FFPE) tissue samples.

Project description:This dataset includes RNA-seq data from ileal and colonic biopsies at time of diagnosis for treatment-naive, uncomplicated Crohn's disease (CD) patients and matched controls. This is includes 56 CD patients each for ileal and colonic tissue and for controls, 46 colonic samples and 45 ileal samples. Clinical characteristics such as development of complications, disease remission, or progression to surgery were recorded with a mean follow-up of 6 years.

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Project description:Differential early pathogenic changes in human ileal gene expression in Crohn's disease and ulcerative colitis

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Crystal structure of Homo sapiens kynureninase.

Project description:Kynureninase is a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes known as the aspartate aminotransferase superfamily or alpha-family. The Homo sapiens and other eukaryotic constitutive kynureninases preferentially catalyze the hydrolytic cleavage of 3-hydroxy-l-kynurenine to produce 3-hydroxyanthranilate and l-alanine, while l-kynurenine is the substrate of many prokaryotic inducible kynureninases. The human enzyme was cloned with an N-terminal hexahistidine tag, expressed, and purified from a bacterial expression system using Ni metal ion affinity chromatography. Kinetic characterization of the recombinant enzyme reveals classic Michaelis-Menten behavior, with a Km of 28.3 +/- 1.9 microM and a specific activity of 1.75 micromol min-1 mg-1 for 3-hydroxy-dl-kynurenine. Crystals of recombinant kynureninase that diffracted to 2.0 A were obtained, and the atomic structure of the PLP-bound holoenzyme was determined by molecular replacement using the Pseudomonas fluorescens kynureninase structure (PDB entry 1qz9) as the phasing model. A structural superposition with the P. fluorescens kynureninase revealed that these two structures resemble the "open" and "closed" conformations of aspartate aminotransferase. The comparison illustrates the dynamic nature of these proteins' small domains and reveals a role for Arg-434 similar to its role in other AAT alpha-family members. Docking of 3-hydroxy-l-kynurenine into the human kynureninase active site suggests that Asn-333 and His-102 are involved in substrate binding and molecular discrimination between inducible and constitutive kynureninase substrates.

| S-EPMC2531291 | biostudies-literature

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