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Read the latest from GENETICS Early Online

Melting dsDNA Donor Molecules Greatly Improves Precision Genome Editing in Caenorhabditis elegans [Investigation]

CRISPR genome editing has revolutionized genetics in many organisms. In the nematode Caenorhabditis elegans one injection into each of the two gonad arms of an adult hermaphrodite exposes hundreds of meiotic germ cells to editing mixtures, permitting the recovery of multiple indels or small precision edits from each successfully injected animal. Unfortunately, particularly for long insertions, editing efficiencies can vary widely, necessitating multiple injections, and often requiring co-selection strategies. Here we show that melting double...

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by Ghanta, K. S., Mello, C....

Defining the Boundaries of Polycomb Domains in Drosophila [Investigation]

Polycomb group (PcG) proteins are an important group of transcriptional repressors that act by modifying chromatin. PcG target genes are covered by the repressive chromatin mark H3K27me3. Polycomb repressive complex 2 (PRC2) is a multiprotein complex that is responsible for generating H3K27me3. In Drosophila, PRC2 is recruited by Polycomb Response Elements (PREs) and then tri-methylates flanking nucleosomes, spreading the H3K27me3 mark over large regions of the genome, the "Polycomb domains". What defines the boundary of...

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by De, S., Gehred, N. D.,...

Evolved Differences in cis and trans Regulation Between the Maternal and Zygotic mRNA Complements in the Drosophila Embryo [Investigation]

How gene expression can evolve depends on the mechanisms driving gene expression. Gene expression is controlled in different ways in different developmental stages; here we ask whether different developmental stages show different patterns of regulatory evolution. To explore the mode of regulatory evolution, we used the early stages of embryonic development controlled by two different genomes, that of the mother and that of the zygote. During embryogenesis in all animals, initial developmental processes are driven...

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by Cartwright, E. L., Lott, S....

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