Category: Uncategorized

EDITING. "It is also possible that stringent synapsis checkpoints evolved, in part, to prevent the formation of defective gametes due to transposable element activity, along with other possible causes of meiotic errors." https://lnkd.in/e2tp_G5 View in LinkedIn

TRANSITION TO ASEXUALITY. "In many cases, the initial evolution of asexuality may thus resemble the evolution of self-fertilisation, and several traits may pre-exist (such as low recombination rates) that make the successful transition to asexuality more likely in some taxa." https://lnkd.in/e2tp_G5 View in LinkedIn

RESETTING. "Alternative transposable element silencing mechanisms, such as those involving small RNAs, may have evolved to ensure proper transposable element control during epigenetic resetting. For example, these mechanisms involve piRNA and/or endo-siRNA in mammal male and female germ lines, respectively, and transfer of siRNA from the central cell to the egg cell in plant female gametophytes." https://lnkd.in/e2tp_G5 View in LinkedIn

SECONDARY ASEXUALITY. "Unless meiosis can be entirely bypassed (as e.g. with vegetative reproduction), secondary asexuality is likely to evolve via modification of meiosis, keeping much of the cell signalling and machinery intact." https://lnkd.in/e2tp_G5 View in LinkedIn

VULNERABILITY. "Meiosis may be specifically vulnerable to transposable element activity for several reasons. These include (1) deficient synapsis and repair due to the reshuffling of meiotic machinery towards transposable element-induced double strand breaks, (2) ectopic recombination among transposable elements, (3) interference with synapsis due to transposable element transcriptional activity." https://lnkd.in/e2tp_G5 View in LinkedIn

ASEXUAL MUTANTS. "The question of how a mitotic asexual mutant can invade a sexual species is at the heart of the debate on the evolutionary maintenance of sex, as this is what is investigated in most theoretical models, and is the situation where the cost of sex is most evident." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

RESETTING RISKS. "Many epigenetic pathways repress the activity of transposable elements, and so resetting epigenetic marks exposes the genome to mobilisation of these elements, which may be particularly detrimental when producing gametes." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

SEXUAL REVERSAL. "Examples of meiosis-derived modes of asexual reproduction include chromosome doubling prior to meiosis (“endomitosis” or “pre-meiotic doubling”), fusion of two of the four products of a single meiosis (“automixis” in animals, “within-tetrad mating” in fungi), and suppression of one of the two meiotic divisions." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

Wildflower planting on farms boosts birds, from skylarks to starlings View in LinkedIn

ESCAPING RESETTING. "There are exceptions, and some genes specifically escape an epigenetic 2n→n ‘meiotic resetting’, leading to transgenerational epigenetic inheritance." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn