Year: 2019
Type: preprint
Abstract: The major cause of the sterility of F1 hybrids formed between Saccharomyces cerevisiae and Saccharomyces paradoxus is anti-recombination. The failure of homologous chromosomes from the different species to recombine causes them to mis-segregate, resulting in aneuploid gametes, most of which are inviable. These effects of anti-recombination have previously impeded the search for other forms of incompatibility, such as negative genetic interactions (Bateson-Dobzhoansky-Muller incompatibilities). By suppressing the meiotic expression of MSH2 and SGS1 , we could increase recombination and improve hybrid fertility seventy-fold. This allowed us to recover meiotic tetrads in which all four gametes were viable, ensuring that segregation had occurred properly to produce perfectly haploid, not aneuploid, recombinant hybrid gametes. We sequenced the genomes of 84 such tetrads, and discovered that some combinations of alleles from different species were significantly under-represented, indicating that there are incompatible genes contributing to reproductive isolation.
DOI: 10.1101/755165
Institutions: Georgia Institute of Technology, Max Planck Institute for Evolutionary Biology, University College London, Okinawa Institute of Science and Technology Graduate University, Wellcome Sanger Institute, Howard Hughes Medical Institute, University of California, Davis, Institute of Molecular Biology, Academia Sinica, Academia Sinica
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W2971900544