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 456577
Title Regular bottlenecks and restrictions to somatic fusion prevent the accumulation of mitochondrial defects in Neurospora
Author(s) Bastiaans, E.; Aanen, D.K.; Debets, A.J.M.; Hoekstra, R.F.; Lestrada, B.; Maas, M.F.P.M.
Source Philosophical Transactions of the Royal Society B. Biological sciences 369 (2014)1646. - ISSN 0962-8436
Department(s) Laboratory of Genetics
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) vegetative incompatibility - filamentous fungi - dna mutations - hyphal fusion - evolution - populations - senescence - intermedia - selection - crassa
Abstract The replication and segregation of multi-copy mitochondrial DNA (mtDNA) are not under strict control of the nuclear DNA. Within-cell selection may thus favour variants with an intracellular selective advantage but a detrimental effect on cell fitness. High relatedness among the mtDNA variants of an individual is predicted to disfavour such deleterious selfish genetic elements, but experimental evidence for this hypothesis is scarce. We studied the effect of mtDNA relatedness on the opportunities for suppressive mtDNA variants in the fungus Neurospora carrying the mitochondrial mutator plasmid pKALILO. During growth, this plasmid integrates into the mitochondrial genome, generating suppressive mtDNA variants. These mtDNA variants gradually replace the wild-type mtDNA, ultimately culminating in growth arrest and death. We show that regular sequestration of mtDNA variation is required for effective selection against suppressive mtDNA variants. First, bottlenecks in the number of mtDNA copies from which a 'Kalilo' culture started significantly increased the maximum lifespan and variation in lifespan among cultures. Second, restrictions to somatic fusion among fungal individuals, either by using anastomosis-deficient mutants or by generating allotype diversity, prevented the accumulation of suppressive mtDNA variants. We discuss the implications of these results for the somatic accumulation of mitochondrial defects during ageing
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