Multiple convergent supergene evolution events in mating-type chromosomes
نویسندگان
چکیده
منابع مشابه
Mating-type locus of Cryptococcus neoformans: a step in the evolution of sex chromosomes.
The sexual development and virulence of the fungal pathogen Cryptococcus neoformans is controlled by a bipolar mating system determined by a single locus that exists in two alleles, alpha and a. The alpha and a mating-type alleles from two divergent varieties were cloned and sequenced. The C. neoformans mating-type locus is unique, spans >100 kb, and contains more than 20 genes. MAT-encoded pro...
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Fungi often mate as haploids, and sex chromosomes (i.e., mating-type chromosomes) that are dimorphic for their size or overall DNA content have never been reported in this kingdom. Using electrophoretic techniques for karyotype analysis, a highly dimorphic chromosome pair that determines mating compatibility is shown to occur in populations of the fungus Microbotryum violaceum. This substantiat...
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Females frequently mate with more than one male, but it is rarely clear why. In species where related individuals frequently meet, multiple mating may allow females to avoid fertilising their eggs with sperm from a close relative. A new study suggests that promiscuous females do indeed suffer lower costs of inbreeding, but that this is because of interactions between embryos.
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Predictions about the evolution of sex determination mechanisms have mainly focused on animals and plants, whereas unicellular eukaryotes such as fungi and ciliates have received little attention. Many taxa within the latter groups can stochastically switch their mating type identity during vegetative growth. Here, we investigate the hypothesis that mating type switching overcomes distortions i...
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ژورنال
عنوان ژورنال: Nature Communications
سال: 2018
ISSN: 2041-1723
DOI: 10.1038/s41467-018-04380-9