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Sunday, July 7, 2019

Human gene-centered transcription factor networks for enhancers and disease variants.

Gene regulatory networks (GRNs) comprising interactions between transcription factors (TFs) and regulatory loci control development and physiology. Numerous disease-associated mutations have been identified, the vast majority residing in non-coding regions of the genome. As current GRN mapping methods test one TF at a time and require the use of cells harboring the mutation(s) of interest, they are not suitable to identify TFs that bind to wild-type and mutant loci. Here, we use gene-centered yeast one-hybrid (eY1H) assays to interrogate binding of 1,086 human TFs to 246 enhancers, as well as to 109 non-coding disease mutations. We detect both loss and…

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Sunday, July 7, 2019

The complete genome sequence of Clostridium indolis DSM 755(T.).

Clostridium indolis DSM 755(T) is a bacterium commonly found in soils and the feces of birds and mammals. Despite its prevalence, little is known about the ecology or physiology of this species. However, close relatives, C. saccharolyticum and C. hathewayi, have demonstrated interesting metabolic potentials related to plant degradation and human health. The genome of C. indolis DSM 755(T) reveals an abundance of genes in functional groups associated with the transport and utilization of carbohydrates, as well as citrate, lactate, and aromatics. Ecologically relevant gene clusters related to nitrogen fixation and a unique type of bacterial microcompartment, the CoAT BMC,…

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Sunday, July 7, 2019

Complete genome sequence of the lignin-degrading bacterium Klebsiella sp. strain BRL6-2.

In an effort to discover anaerobic bacteria capable of lignin degradation, we isolated Klebsiella sp. strain BRL6-2 on minimal media with alkali lignin as the sole carbon source. This organism was isolated anaerobically from tropical forest soils collected from the Bisley watershed at the Ridge site in the El Yunque National Forest in Puerto Rico, USA, part of the Luquillo Long-Term Ecological Research Station. At this site, the soils experience strong fluctuations in redox potential and are characterized by cycles of iron oxidation and reduction. Genome sequencing was targeted because of its ability to grow on lignin anaerobically and lignocellulolytic…

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Sunday, July 7, 2019

Replication of the Escherichia coli chromosome in RNase HI-deficient cells: multiple initiation regions and fork dynamics.

DNA replication in Escherichia coli is normally initiated at a single origin, oriC, dependent on initiation protein DnaA. However, replication can be initiated elsewhere on the chromosome at multiple ectopic oriK sites. Genetic evidence indicates that initiation from oriK depends on RNA-DNA hybrids (R-loops), which are normally removed by enzymes such as RNase HI to prevent oriK from misfiring during normal growth. Initiation from oriK sites occurs in RNase HI-deficient mutants, and possibly in wild-type cells under certain unusual conditions. Despite previous work, the locations of oriK and their impact on genome stability remain unclear. We combined 2D gel electrophoresis…

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