Hot compost piles may push a common mold toward risky sex
Stanislaw JM, Momany M
Composting
If you turn a compost pile that's cooking at 50°C, you're creating exactly the conditions this fungus uses to swap genes sexually and potentially evolve resistance to the antifungal drugs doctors rely on.
This mold lives in soil, compost, and plant debris everywhere, and most of the time it just makes simple clone-like spores that float through the air. But researchers discovered that when the fungus grows in really hot spots, like deep inside a steaming compost pile, it switches on a completely different set of genes tied to sexual reproduction instead. That matters because sexual reproduction lets fungi shuffle their genes and adapt faster, including potentially becoming resistant to the limited antifungal medicines we have.
Key Findings
Spores produced at 37°C versus 50°C have distinct shapes, germination speeds, and gene expression patterns, set by a narrow window late in spore formation
37°C spore formation activates brlA, the master gene controlling normal asexual (clonal) spore production
50°C spore formation instead activates MAT1-1-1, the master gene controlling sexual reproduction, suggesting heat primes the fungus for sex over cloning
chevron_right Technical Summary
Scientists found that a common mold found in compost and soil, Aspergillus fumigatus, makes different kinds of spores depending on whether it grows at human body temperature or at hot composting temperatures, and the hotter temperature pushes the fungus toward sexual reproduction, which could speed up its evolution of resistance to antifungal drugs.
Abstract Preview
Original paper
Temperature during conidiophore development primes Aspergillus fumigatus spore transcriptome for asexual or sexual reproduction.
Aspergillus fumigatus is a thermotolerant saprobe found in soils and plant debris worldwide and an important pathogen of humans, causing two million deaths annually. A. fumigatus makes abundant ase...
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