Analyses of expressed sequence tags in Neurospora reveal rapid evolution of genes associated with the early stages of sexual reproduction in fungi

被引:10
作者
Nygren, Kristiina [1 ,5 ]
Wallberg, Andreas [2 ]
Samils, Nicklas [1 ]
Stajich, Jason E. [3 ]
Townsend, Jeffrey P. [4 ]
Karlsson, Magnus [1 ]
Johannesson, Hanna [5 ]
机构
[1] Swedish Univ Agr Sci, Dept Forest Mycol & Plant Pathol, SE-75007 Uppsala, Sweden
[2] Uppsala Univ, Dept Med Biochem & Microbiol, SE-751 Uppsala, Sweden
[3] Univ Calif Riverside, Dept Plant Pathol & Microbiol, Riverside, CA 92521 USA
[4] Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06520 USA
[5] Uppsala Univ, Evolutionary Biol Ctr, Dept Evolutionary Biol, SE-75236 Uppsala, Sweden
基金
瑞典研究理事会;
关键词
Neurospora; Reproductive genes; dN/dS; Speciation; Microarray; SPOTTED DNA MICROARRAYS; GENOME-WIDE; CODON USAGE; PHYLOGENETIC ANALYSIS; SPECIES RECOGNITION; PROTEIN; FERTILITY; ALIGNMENT; ACCURACY; HYBRIDIZATION;
D O I
10.1186/1471-2148-12-229
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Background: The broadly accepted pattern of rapid evolution of reproductive genes is primarily based on studies of animal systems, although several examples of rapidly evolving genes involved in reproduction are found in diverse additional taxa. In fungi, genes involved in mate recognition have been found to evolve rapidly. However, the examples are too few to draw conclusions on a genome scale. Results: In this study, we performed microarray hybridizations between RNA from sexual and vegetative tissues of two strains of the heterothallic (self-sterile) filamentous ascomycete Neurospora intermedia, to identify a set of sex-associated genes in this species. We aligned Expressed Sequence Tags (ESTs) from sexual and vegetative tissue of N. intermedia to orthologs from three closely related species: N. crassa, N. discreta and N. tetrasperma. The resulting four-species alignments provided a dataset for molecular evolutionary analyses. Our results confirm a general pattern of rapid evolution of fungal sex-associated genes, compared to control genes with constitutive expression or a high relative expression during vegetative growth. Among the rapidly evolving sex-associated genes, we identified candidates that could be of importance for mating or fruiting-body development. Analyses of five of these candidate genes from additional species of heterothallic Neurospora revealed that three of them evolve under positive selection. Conclusions: Taken together, our study represents a novel finding of a genome-wide pattern of rapid evolution of sex-associated genes in the fungal kingdom, and provides a list of candidate genes important for reproductive isolation in Neurospora.
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页数:17
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