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Friday, July 19, 2019

Amplification and thrifty single-molecule sequencing of recurrent somatic structural variations.

Deletion of tumor-suppressor genes as well as other genomic rearrangements pervade cancer genomes across numerous types of solid tumor and hematologic malignancies. However, even for a specific rearrangement, the breakpoints may vary between individuals, such as the recurrent CDKN2A deletion. Characterizing the exact breakpoints for structural variants (SVs) is useful for designating patient-specific tumor biomarkers. We propose AmBre (Amplification of Breakpoints), a method to target SV breakpoints occurring in samples composed of heterogeneous tumor and germline DNA. Additionally, AmBre validates SVs called by whole-exome/genome sequencing and hybridization arrays. AmBre involves a PCR-based approach to amplify the DNA segment containing an…

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Sunday, July 7, 2019

An amoebal grazer of cyanobacteria requires cobalamin produced by heterotrophic bacteria.

Amoebae are unicellular eukaryotes that consume microbial prey through phagocytosis, playing a role in shaping microbial foodwebs. Many amoebal species can be cultivated axenically in rich media or monoxenically with single bacterial prey species. Here we characterize heterolobosean amoeba LPG3, a recent natural isolate, which is unable to grow on unicellular cyanobacteria, its primary food source, in the absence of a heterotrophic bacterium, a Pseudomonas species coisolate. To investigate the molecular basis of this requirement for heterotrophic bacteria, we performed a screen using a defined non-redundant transposon library of Vibrio cholerae which implicated genes in corrinoid uptake and biosynthesis. Furthermore,…

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Sunday, July 7, 2019

Genomewide Dam methylation in Escherichia coli during long-term stationary phase.

DNA methylation in prokaryotes is widespread. The most common modification of the genome is the methylation of adenine at the N-6 position. In Escherichia coli K-12 and many gammaproteobacteria, this modification is catalyzed by DNA adenine methyltransferase (Dam) at the GATC consensus sequence and is known to modulate cellular processes including transcriptional regulation of gene expression, initiation of chromosomal replication, and DNA mismatch repair. While studies thus far have focused on the motifs associated with methylated adenine (meA), the frequency of meA across the genome, and temporal dynamics during early periods of incubation, here we conduct the first study on…

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