idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo
Science Video Project

idw-News App:


Google Play Store

Share on: 
02/24/2022 10:51

Sex pays off: Asexual reproduction can have negative effects on genome evolution in stick insects

Gabriele Meseg-Rutzen Presse und Kommunikation
Universität zu Köln

    Stick insects that reproduce asexually cannot adapt as quickly in the course of evolution as sexually reproducing species, leading to a decrease in biological diversity / publication in ‘Science Advances’

    An international research team has shown that parthenogenesis, a form of asexual reproduction, negatively affects the genome evolution of the animals that practise it. In this type of reproduction, the offspring are produced from a single unfertilized egg. The study was led by Professor Dr Tanja Schwander and Professor Dr Marc Robinson-Rechavi at the University of Lausanne in cooperation with partners at the University of Edinburgh and Dr Jens Bast at the University of Cologne. The results have been published on 23 February under the title ‘Convergent consequences of parthenogenesis on stick insect genomes’ in Science Advances.
    Offspring are produced via two main reproductive pathways: sexual, i.e. fertilization between male and female gametes, or asexual, for example parthogenesis. In parthenogenesis, females pass on their genes without a male being involved. Timema are a genus of stick insects native to western North America, and includes both sexually and asexually reproducing species. The biologists discovered that in asexually reproducing Timema, beneficial mutations cannot be passed on as efficiently in the long term.
    Like humans, Timema have a double set of chromosomes. The extent to which these two genome copies differ is described as heterozygosity. During parthenogenesis, however, this difference is lost and the two genome copies become very similar. This reduces variability, which can be important for species to adapt to their environment.
    The research team analysed the genomes of five asexual Timema species and closely related sexually species that reproduce sexually. ‘The results show that genetic exchange during sexual reproduction promotes the speed of adaptation and genetic diversity in the insects' natural populations,’ said Dr Jens Bast.
    Bast researches the processes of sexual reproduction and the mechanisms of asexuality in the University of Cologne’s ‘Sex Lab’.
    Media Contact:
    Dr Jens Bast
    Institute of Zoology, University of Cologne
    +49 221 470 2929
    Press and Communications Team:
    Eva Schissler
    +49 221 470 4030


    Criteria of this press release:
    Biology, Zoology / agricultural and forest sciences
    transregional, national
    Research results



    Search / advanced search of the idw archives
    Combination of search terms

    You can combine search terms with and, or and/or not, e.g. Philo not logy.


    You can use brackets to separate combinations from each other, e.g. (Philo not logy) or (Psycho and logy).


    Coherent groups of words will be located as complete phrases if you put them into quotation marks, e.g. “Federal Republic of Germany”.

    Selection criteria

    You can also use the advanced search without entering search terms. It will then follow the criteria you have selected (e.g. country or subject area).

    If you have not selected any criteria in a given category, the entire category will be searched (e.g. all subject areas or all countries).