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Heterologous expression of mating-type genes in filamentous fungi
Abstract:
Podospora anserina and Neurospora crassa, two filamentous heterothallic ascomycetes, have a single mating-type locus with two alternate forms called mat+ and mat- and A and a, respectively. Mating type controls entry into the sexual cycle, events subsequent to fertilization, and, in N. crassa, prevents the formation of mixed mating-type heterokaryons. The mating types of these two organisms display similarity in their DNA structure and in the encoded polypeptides involved in fertilization. Here we show that this molecular similarity reflects a functional homology with respect to mating identity. Transformation experiments show that the N. crassa mating-type genes can provide the fertilization functions in P. anserina strains devoid of mating specificity as well as in mat+ and mat- strains. Reciprocally, the introduction of P. anserina mating-type genes confers mating activity in N. crassa. Functional identity between the mating types is not observed for vegetative incompatibility or for post-fertilization events such as meiosis and ascosporogenesis.
Insights
The mating-type genes of Podospora anserina and Neurospora crassa are functionally homologous for fertilization. This means genes from one species can restore mating ability in the other, demonstrating conserved function.
Area of Science:
- Mycology
- Genetics
- Molecular Biology
Background:
- Podospora anserina and Neurospora crassa are filamentous fungi with a single mating-type locus.
- Mating type regulates sexual reproduction and, in N. crassa, prevents mixed-mating-type heterokaryons.
- Previous studies indicated molecular similarities in mating-type DNA and encoded proteins.
Purpose of the Study:
- To investigate the functional homology of mating-type genes between P. anserina and N. crassa.
- To determine if mating-type genes from one species can restore mating functions in the other.
Main Methods:
- Transformation experiments were conducted using mating-type genes.
- N. crassa mating-type genes were introduced into P. anserina strains.
- P. anserina mating-type genes were introduced into N. crassa.
Main Results:
- N. crassa mating-type genes restored fertilization functions in P. anserina strains lacking mating specificity.
- Introduction of P. anserina mating-type genes conferred mating activity in N. crassa.
- Functional identity was not observed for vegetative incompatibility or post-fertilization events.
Conclusions:
- The mating-type genes of P. anserina and N. crassa exhibit functional homology specifically for mating identity and fertilization.
- This functional conservation highlights a shared evolutionary basis for sexual reproduction regulation in these fungi.