Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 333293
Title The evolution of non-reciprocal nuclear exchange in mushrooms as a consequence of genomic conflict
Author(s) Aanen, D.K.; Kuyper, T.W.; Debets, A.J.M.; Hoekstra, R.F.
Source Proceedings of the Royal Society. B: Biological Sciences 271 (2004)1545. - ISSN 0962-8452 - p. 1235 - 1241.
DOI https://doi.org/10.1098/rspb.2004.2693
Department(s) Laboratory of Genetics
Sub-department of Soil Quality
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) basidiomycete coprinus-cinereus - mitochondrial-dna - uniparental inheritance - pleurotus-ostreatus - podospora-anserina - pheromone - specificities - homokaryons - speciation - mechanisms
Abstract Heterothallic mushrooms accomplish sex by exchanging nuclei without cytoplasm. Hyphal fusions occur between haploid mycelia resulting from germinated spores and subsequent reciprocal nuclear exchange without cytoplasmic mixing. The resulting dikaryon is therefore a cytoplasmic mosaic with uniformly distributed nuclei (two in each cell). Cytoplasmic inheritance is doubly uniparental: both mated monokaryons can potentially transmit their cytoplasm to the sexual spores, but normally only a single type per spore is found. Intracellular competition between mitochondria is thus limited, but at the dikaryon level, the two types of mitochondria compete over transmission. This creates the conditions for genomic conflict: within the dikaryon, a selfish mitochondrial mutant with increased relative transmission can be favoured, but selection between dikaryons will act against such a mitochondrial mutant. Moreover, because nuclear fitness is directly dependent on dikaryon fitness, a reduction in dikaryon fitness directly conflicts with nuclear interests. We propose that genomic conflict explains the frequent occurrence of non-reciprocal nuclear exchange in mushrooms. With non-reciprocal exchange, one monokaryon donates a nucleus and the other accepts it, but not vice versa as in the typical life cycle. We propose a model where non-reciprocal nuclear exchange is primarily driven by mitochondria inducing male sterility and the evolution of nuclear suppressors
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