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Homo sapiens

ABSTRACT: single-cell BCR repertoire from seven healthy donors

PROVIDER: PRJDB13013 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	DRR346905_1.fastq.gz	Fastqsanger.gz
	DRR346905_2.fastq.gz	Fastqsanger.gz
	DRR346906_1.fastq.gz	Fastqsanger.gz
	DRR346906_2.fastq.gz	Fastqsanger.gz
	DRR346907_1.fastq.gz	Fastqsanger.gz

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Homo sapiens

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Homo sapiens foetal mesenchymal stem cell miRNA transcriptome

Project description:We have sequenced miRNA libraries from human embryonic, neural and foetal mesenchymal stem cells. We report that the majority of miRNA genes encode mature isomers that vary in size by one or more bases at the 3’ and/or 5’ end of the miRNA. Northern blotting for individual miRNAs showed that the proportions of isomiRs expressed by a single miRNA gene often differ between cell and tissue types. IsomiRs were readily co-immunoprecipitated with Argonaute proteins in vivo and were active in luciferase assays, indicating that they are functional. Bioinformatics analysis predicts substantial differences in targeting between miRNAs with minor 5’ differences and in support of this we report that a 5’ isomiR-9-1 gained the ability to inhibit the expression of DNMT3B and NCAM2 but lost the ability to inhibit CDH1 in vitro. This result was confirmed by the use of isomiR-specific sponges. Our analysis of the miRGator database indicates that a small percentage of human miRNA genes express isomiRs as the dominant transcript in certain cell types and analysis of miRBase shows that 5’ isomiRs have replaced canonical miRNAs many times during evolution. This strongly indicates that isomiRs are of functional importance and have contributed to the evolution of miRNA genes

2014-08-06 | GSE58734 | GEO

Homo sapiens

Project description:B cell repertoire sequencing in healthy individuals

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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

Homo sapiens whole blood.

Project description:RNA extracted at 240min. Samples are rRNA depleted. Expression measurement of Homo sapiens genes.

2019-07-31 | GSE114179 | GEO

RNA-seq of variable heavy and light IgG fragments of CD19(+)CD24(high)CD38(high) subpopulation isolated from peripheral blood of patients with multiple sclerosis and healthy donors.

Project description:To date nothing is known about the specificity of regulatory B cells. Here we analyzed the B cell repertoire at the Ig gene level of regulatory transitional CD24(high)CD38(high) B cells of patients with multiple sclerosis (MS) in comparison with healthy donors. 5 patients with highly active MS, 4 patients with benign MS and 6 healthy donors were examined. Mononuclear cells from peripheral blood were stained against CD19, CD24 and CD38 surface markers. Subpopulation CD19(+)CD24(high)CD38(high) and total pool of CD19(+) cells were sorted individually for subsequent RNA isolation and BCR sequences comparison. Variable heavy (VH) and light (VL) chains genes of each patient were amplified from cDNA and deep sequencing of the VH and VL genes was carried out.

2020-09-24 | E-MTAB-9573 | biostudies-arrayexpress

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