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Naked mole rats may become good parents by eating their queen’s faecesīecause any young female mole rat can become the colony’s next queen, the researchers then tested the worker females’ potential fertility by removing 3-year-old females from their colonies and placing them in individual cages with a male for four weeks.
Combined with the team’s previous discovery of germ cells even in 10-year-old mole rats, the observations suggest that naked mole rats can continually replenish their egg supply. The researchers then grew ovary sections of young animals in their laboratories and observed ongoing oogenesis. At 8 days old, the naked mole rats had an average of 1.5 million egg cells – 95 times more than 8-day-old mice, says Brieño-Enríquez.
In the naked mole rats, though, Brieño-Enríquez and his colleagues found large numbers of germ cells at every stage of life they tested, with numbers steadily increasing throughout the first week of life. Those eggs gradually die over time, leading to reduced fertility with age. In humans, mice and other mammals, oogenesis only occurs before birth and, in some species, shortly afterwards, leaving newborn females with a limited lifetime supply of eggs. In particular, they were looking for germ cells that can divide and mature into oocytes – or eggs – through a process known as oogenesis. They used advanced staining and testing techniques to identify the different kinds of cells they saw. Curious about these differences in reproductive lifespans, Brieño-Enríquez and his colleagues looked at the ovaries of naked mole rats under a microscope when the animals were 1, 5, 8, 15, 28 and 90 days old.
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