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Origin, Function, and Transmission of Accessory Chromosomes

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Genetics and Biotechnology

Part of the book series: The Mycota ((MYCOTA,volume 2))

Abstract

Fungal genomes are highly diverse and remarkably variable—even within species. Presence/absence polymorphisms of entire chromosomes are frequently found between individuals of a population. The affected chromosomes are considered accessory and therefore not essential for growth. How these accessory chromosomes are maintained in a population is unknown, but it may either be due to a fitness benefit or a transmission advantage during meiosis or mitosis. Although many fungal accessory chromosomes were shown to confer a fitness benefit, e.g., by encoding virulence determinants essential for virulence on specific hosts, new findings demonstrate that also transmission advantages play a role in their maintenance in fungal genomes. Here, we report the current knowledge of the origin and function of fungal accessory chromosomes with a particular focus on their modes of transmission during mitosis and meiosis. We discuss transmission advantages as possible mechanisms for the widespread occurrence of these chromosomes.

This chapter partly overlaps with a chapter in a thesis which MH submitted to the Christian-Albrechts University of Kiel, Germany, in order to obtain a PhD.

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Correspondence to Eva H. Stukenbrock .

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Habig, M., Stukenbrock, E.H. (2020). Origin, Function, and Transmission of Accessory Chromosomes. In: Benz, J.P., Schipper, K. (eds) Genetics and Biotechnology. The Mycota, vol 2. Springer, Cham. https://doi.org/10.1007/978-3-030-49924-2_2

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