Antenna-like cell appendage may help turtle embryos sense sex-deciding nest temperatures
When most baby turtles hatch, their sex depends on the temperature of the sand or soil where their mother laid her eggs. Warm incubation produces females, while cool nests produce males.
A groundbreaking study led by Iowa State University evolutionary biologist Nicole Valenzuela reveals that a previously overlooked cellular component—primary cilia—may play a crucial role in helping turtle embryos sense the temperatures of their nesting environment and determine their sex. This discovery marks the first time that primary cilia have been linked to sex determination in turtles, a trait that has long been known to be influenced by temperature in most turtle species.
Primary cilia, antenna-like protrusions found on most animal cells, are now being recognized for their importance in development and disease, making this research particularly significant. Valenzuela's team compared gene expression, protein interactions, and cell signaling in two turtle species: painted turtles, which use temperature to determine sex, and spiny softshell turtles, which have sex chromosomes.
The analysis showed that while the two species share many of the same transcription factor hubs responsible for sex determination, there were significant differences in the role of primary cilia between the species. These findings suggest that primary cilia may help turtles detect the critical temperature cues needed for proper sex development.
The study, published in PLOS One, opens up new avenues for research into the molecular mechanisms of sex determination and the potential therapeutic applications of understanding primary cilia function, which has also been implicated in various human diseases.
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