Regulation of the Th1 genomic locus from Ifng through Tmevpg1 by T-bet.

Long noncoding RNAs (lncRNAs), critical regulators of protein-coding genes, are likely to be coexpressed with neighboring protein-coding genes in the genome. How the genome integrates signals to achieve coexpression of lncRNA genes and neighboring protein-coding genes is not well understood. The lncRNA Tmevpg1 (NeST, Ifng-AS1) is critical for Th1-lineage-specific expression of Ifng and is coexpressed with Ifng. In this study, we show that T-bet guides epigenetic remodeling of Tmevpg1 proximal and distal enhancers, leading to recruitment of stimulus-inducible transcription factors, NF-κB and Ets-1, to the locus. Activities of Tmevpg1-specific enhancers and Tmevpg1 transcription are dependent upon NF-κB. Thus, we propose that T-bet stimulates epigenetic remodeling of Tmevpg1-specific enhancers and Ifng-specific enhancers to achieve Th1-lineage-specific expression of Ifng.

Cutting edge: influence of Tmevpg1, a long intergenic noncoding RNA, on the expression of Ifng by Th1 cells.

The majority of the genome is noncoding and was thought to be nonfunctional. However, it is now appreciated that transcriptional control of protein coding genes resides within these noncoding regions. Thousands of genes encoding long intergenic noncoding RNAs (lincRNAs) have been recently identified throughout the genome, which positively or negatively regulate transcription of neighboring target genes. Both TMEVPG1 and its mouse ortholog encode lincRNAs and are positioned near the IFN-γ gene (IFNG). In this study, we show that transcription of both mouse and human TMEVPG1 genes is Th1 selective and dependent on Stat4 and T-bet, transcription factors that drive the Th1 differentiation program. Ifng expression is partially restored in Stat4-/-Tbx21-/- cells through coexpression of T-bet and Tmevpg1, and Tmevpg1 expression contributes to, but alone is not sufficient to, drive Th1-dependent Ifng expression. Our results suggest that TMEVPG1 belongs to the general class of lincRNAs that positively regulate gene transcription.

More than Our Enemy: Making Space for the Microbiome in Pharmacy Education.

The microbiome is the collection of commensal microorganisms along with their genomes inhabiting the human body. Despite the many known beneficial effects of these microbes on human health, the 2016 ACPE Standards for Doctor of Pharmacy curricula describe Medical Microbiology in Appendix 1 with a pathogen-centered focus. Over the last twenty years, evolving biotechnology has enabled a deeper understanding of the microbiome in the context of both wellness and disease. Retail stores are allocating increasing shelf space to commercial probiotic products, while the approach to PharmD training on the selection and use of these natural care products remains static, creating a disproportionate footprint between PharmD curricula and consumer markets. Looking to the future of patient care, we brief pharmacy educators on the current evidence and invite discussion around a proposed revision to the 2025 ACPE Standards that would add language recognizing the beneficial role of the commensal microbiota and expanding therapeutic applications of microbiome supplementation. We suggest a variety of opportunities within Doctor of Pharmacy curricula as leverage points for including relevant aspects of the microbiome in the training of future pharmacists.

Variation in the α2A-adrenergic receptor gene and risk of gestational diabetes.

AIM: Sympathetic activation suppresses insulin secretion via pancreatic ADRA2A.  Because sympathetic activity and insulin demand increase during pregnancy, we tested the hypothesis  that ADRA2A variants are associated with gestational diabetes (GDM). PATIENTS & METHODS: Among Caucasian pregnant women without pre-existing diabetes, we genotyped 458 who had GDM and 1537 without GDM for seven ADRA2A variants. RESULTS: rs1800038 (OR: 2.34; p = 0.020) and rs3750625 (OR: 1.56; p = 0.010) increased the risk of GDM, and rs11195418 decreased it (OR: 0.62; p = 0.025). The associations remained significant after adjustment for maternal age, maternal BMI, parity and a genetic risk score that included variants previously associated with Type 2 diabetes mellitus and GDM. CONCLUSION: ADRA2A genetic variation contributes independently to the risk of GDM in Caucasian women.

Expression and functions of long noncoding RNAs during human T helper cell differentiation.

Long noncoding RNAs (lncRNAs) regulate an array of biological processes in cells and organ systems. Less is known about their expression and function in lymphocyte lineages. Here we have identified >2000 lncRNAs expressed in human T-cell cultures and those that display a TH lineage-specific pattern of expression and are intragenic or adjacent to TH lineage-specific genes encoding proteins with immunologic functions. One lncRNA cluster selectively expressed by the effector TH2 lineage consists of four alternatively spliced transcripts that regulate the expression of TH2 cytokines, IL-4, IL-5 and IL-13. Genes encoding this lncRNA cluster in humans overlap the RAD50 gene and thus are contiguous with the previously described TH2 locus control region (LCR) in the mouse. Given its genomic synteny with the TH2-LCR, we refer to this lncRNA cluster as TH2-LCR lncRNA.

Phenotype-Driven Plasma Biobanking Strategies and Methods.

Biobank development and integration with clinical data from electronic medical record (EMR) databases have enabled recent strides in genomic research and personalized medicine. BioVU, Vanderbilt's DNA biorepository linked to de-identified clinical EMRs, has proven fruitful in its capacity to extensively appeal to numerous areas of biomedical and clinical research, supporting the discovery of genotype-phenotype interactions. Expanding on experiences in BioVU creation and development, we have recently embarked on a parallel effort to collect plasma in addition to DNA from blood specimens leftover after routine clinical testing at Vanderbilt. This initiative offers expanded utility of BioVU by combining proteomic and metabolomic approaches with genomics and/or clinical outcomes, widening the breadth for potential research and subsequent future impact on clinical care. Here, we describe the considerations and components involved in implementing a plasma biobank program from a feasibility assessment through pilot sample collection.

Epigenetic Activation and Silencing of the Gene that Encodes IFN-γ.

Transcriptional activation and repression of genes that are developmentally regulated or exhibit cell-type specific expression patterns is largely achieved by modifying the chromatin template at a gene locus. Complex formation of stable epigenetic histone marks, loss or gain of DNA methylation, alterations in chromosome conformation, and specific utilization of both proximal and distal transcriptional enhancers and repressors all contribute to this process. In addition, long non-coding RNAs are a new species of regulatory RNAs that either positively or negatively regulate transcription of target gene loci. IFN-γ is a pro-inflammatory cytokine with critical functions in both innate and adaptive arms of the immune system. This review focuses on our current understanding of how the chromatin template is modified at the IFNG locus during developmental processes leading to its transcriptional activation and silencing.

The invasive chytrid fungus of amphibians paralyzes lymphocyte responses.

The chytrid fungus, Batrachochytrium dendrobatidis, causes chytridiomycosis and is a major contributor to global amphibian declines. Although amphibians have robust immune defenses, clearance of this pathogen is impaired. Because inhibition of host immunity is a common survival strategy of pathogenic fungi, we hypothesized that B. dendrobatidis evades clearance by inhibiting immune functions. We found that B. dendrobatidis cells and supernatants impaired lymphocyte proliferation and induced apoptosis; however, fungal recognition and phagocytosis by macrophages and neutrophils was not impaired. Fungal inhibitory factors were resistant to heat, acid, and protease. Their production was absent in zoospores and reduced by nikkomycin Z, suggesting that they may be components of the cell wall. Evasion of host immunity may explain why this pathogen has devastated amphibian populations worldwide.