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This fish species survived 100,000 years without males. Scientists thought it should be long dead – but it's thriving
- The Amazon molly, an all-female fish, has survived roughly 100,000 years without males, challenging evolutionary expectations.
- Researchers identify gene conversion as a key mechanism that helps the molly repair DNA and curb mutation accumulation.
- The species began from a single hybrid event about 100,000 years ago, giving it mixed ancestral genetics for resilience.
- Researchers note that gene conversion targets the most dangerous mutation-prone genome areas, helping maintain health.
- The Amazon molly carries genetic material from two closely related species, providing variation from the outset.
- Horizontal gene transfer is discussed as another potential source of diversity in ancient asexuals like the Amazon molly.
- Experts say the Amazon molly’s longevity informs broader biology, including potential human mutation research.
- The bdelloid rotifer is cited as another ancient asexual with long survival and horizontal gene transfer.
- The study frames Muller’s ratchet as a broader constraint on life, not a simple rule that asexuality always fails.
- The article highlights future research to determine how long gene conversion can sustain the genome without sex.
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