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Birch sap samples

ABSTRACT: Metagenomes of birch sap samples

PROVIDER: PRJNA685386 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13790900_1.fastq.gz	Fastqsanger.gz
	SRR13790900_2.fastq.gz	Fastqsanger.gz
	SRR13790901_1.fastq.gz	Fastqsanger.gz
	SRR13790901_2.fastq.gz	Fastqsanger.gz
	SRR13790902_1.fastq.gz	Fastqsanger.gz

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Birch sap samples

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Gene expression analysis of nasal mucosa in birch pollen allergic and non-allergic individuals upon nasal provocation with birch pollen

Project description:Birch pollen is a significant cause of allergic rhinitis, yet the mechanisms of sensitization is to be understood completely. Here, we investigate the changes in gene expression of birch pollen allergic and non-allergic individuals that occur as a result of nasal provocation with birch pollen.

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Antigen specific human conventional T cells (CD154+) or regulatory T cells (CD137+) directed agains A. fumigatus or Birch pollen lysate isolated from Birch pollen allergic patients or healthy controls.

Project description:Foxp3+ regulatory T cells (Treg) play a central role for tolerance against self and innocuous environmental antigens. However, the role of antigen-specificity for Treg-mediated tolerance is only incompletely understood. Here we show by direct ex vivo characterization of human CD4+ T cells, that the response against innocuous airborne antigens, such as plant pollen or fungal spores, is dominated by memory-like antigen-specific Treg. Surprisingly, breakdown of tolerance in atopic donors was not accompanied by a quantitatively or qualitatively altered Treg response, but instead correlated with a striking dichotomy of Treg versus Th2 target specificity. Allergenic proteins, are selectively targeted by Th2 cells, but not Treg. Thus human Treg specific for airborne antigens maintain tolerance at mucosal sites and the failure to generate specific Treg against a subgroup of antigens provides a window of opportunity for allergy development. PBMCs from sex and age matched birch pollen allergic patients and healthy controls, were stimulated (7h) with airborne fungal (A. fumigatus) or birch pollen antigen (birch) and sorted into antigen specific conventional and regulatory T cells according to their expression of CD154+ and CD137+ on CD4+ T cells, respectively. Number of samples per group in parentheses: Healthy controls stimulated with A. fumigatus (n=5), allergic patients stimulated with A. fumigatus (n=6), healthy controls stimulated with birch (n=6), allergic patients stimulated with birch (n=4).

2016-10-25 | E-GEOD-77018 | biostudies-arrayexpress

silver birch succession

Project description:silver birch succession Metagenomic assembly

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Role of the SAF-A SAP domain in X inactivation, transcription, splicing, and cell proliferation [CutandRun]

Project description:SAF-A is conserved throughout vertebrates and has emerged as an important factor regulating a multitude of nuclear functions, including lncRNA localization, gene expression, and splicing. SAF-A has several functional domains, including an N-terminal SAP domain that binds directly to DNA. Phosphorylation of SAP domain serines S14 and S26 are important for SAF-A localization and function during mitosis, however whether these serines are involved in interphase functions of SAF-A is not known. In this study we tested for the role of the SAP domain, and SAP domain serines S14 and S26 in X chromosome inactivation, protein dynamics, gene expression, splicing, and cell proliferation. Here we show that the SAP domain serines S14 and S26 are required to maintain XIST RNA localization and polycomb-dependent histone modifications on the inactive X chromosome in female cells. In addition, we present evidence that an Xi localization signal resides in the SAP domain. We found that that the SAP domain is not required to maintain gene expression and plays only a minor role in mRNA splicing. In contrast, the SAF-A SAP domain, in particular serines S14 and S26, are required for normal protein dynamics, and to maintain normal cell proliferation. We propose a model whereby dynamic phosphorylation of SAF-A serines S14 and S26 mediates rapid turnover of SAF-A interactions with DNA during interphase.

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Role of the SAF-A SAP domain in X inactivation, transcription, splicing, and cell proliferation [DNA-seq]

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Role of the SAF-A SAP domain in X inactivation, transcription, splicing, and cell proliferation [ATAC-seq]

2025-05-14 | GSE277216 | GEO

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Project description:Human BEAS-2B were exposed to whole birch pollen using a Pollen Sedimentation Chamber. The chamber was designed to be able to dose cells to dry whole pollen. The goal was to understand the reaction of human epithelial cells to a human real life pollen exposure.

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