2,283 results found
    1. Evolutionary Biology

    Free-living human cells reconfigure their chromosomes in the evolution back to uni-cellularity

    Jin Xu et al.
    Human cell lines regress to become ‘de-sexualized’ by reconfiguring to a 2:3 X/A ratio of high fitness, thus shedding light on the evolution of mammalian sex chromosomes.
    1. Chromosomes and Gene Expression

    Chromosome-wide mechanisms to decouple gene expression from gene dose during sex-chromosome evolution

    Bayly S Wheeler et al.
    A chromosome-wide mechanism balances X-linked gene expression between the sexes in C. elegans, but no similar chromosome-wide mechanism balances gene expression between X chromosomes and autosomes.
    1. Chromosomes and Gene Expression

    High-resolution, genome-wide mapping of positive supercoiling in chromosomes

    Monica S Guo et al.
    GapR-seq enables the global mapping of positive supercoiling in bacteria and yeast, revealing positive supercoils downstream of highly expressed genes and, in yeast, associated with centromeres, pericentromeres, telomeres, replication origins, and R-loops.
    1. Evolutionary Biology
    2. Genetics and Genomics

    Evolution of gene dosage on the Z-chromosome of schistosome parasites

    Marion A L Picard et al.
    An analysis of gene dosage at the DNA, RNA and protein level yields new insights into the early stages of Z-chromosome dosage compensation in schistosome parasites.
    1. Evolutionary Biology

    The rise and fall of the ancient northern pike master sex-determining gene

    Qiaowei Pan et al.
    Tracing the evolution of an old master sex determination gene reveals a diversity of sex determination transitions, including a complete Y chromosome loss, among an old teleost order (Esociformes).
    1. Evolutionary Biology

    Evolutionary stasis of the pseudoautosomal boundary in strepsirrhine primates

    Rylan Shearn et al.
    A larger non-recombining region in sexually dimorphic primates compared to sexually monomorphic ones supports the view that sexually antagonistic mutations have influenced the evolution of sex chromosomes in primates.
    1. Chromosomes and Gene Expression

    Successful transmission and transcriptional deployment of a human chromosome via mouse male meiosis

    Christina Ernst et al.
    Transmission of an entire human chromosome through the mouse male germline reveals an unexpectedly high tolerance of aneuploidy during male meiosis and results in accurate transcriptional deployment despite massive epigenetic remodeling during spermatogenesis.
    1. Genetics and Genomics

    Loss of centromere function drives karyotype evolution in closely related Malassezia species

    Sundar Ram Sankaranarayanan et al.
    The centromeres in Malassezia species, by breakage or inactivation, facilitate genome rearrangements that can result in varying karyotypes and contribute to the evolution of these species.
    1. Evolutionary Biology
    2. Genetics and Genomics

    Gene flow mediates the role of sex chromosome meiotic drive during complex speciation

    Colin D Meiklejohn et al.
    Selfish genetic elements may either promote or prevent the evolution of reproductive barriers, depending on the extent of gene flow between species.
    1. Chromosomes and Gene Expression
    2. Genetics and Genomics

    A map of human PRDM9 binding provides evidence for novel behaviors of PRDM9 and other zinc-finger proteins in meiosis

    Nicolas Altemose et al.
    In humans, specific sequence features can predict whether meiotic recombination occurs at sites bound by the protein PRDM9, whose DNA-binding zinc-finger domain can unexpectedly bind to gene promoters and to other copies of PRDM9.

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