How do Andean mice cope with oxygen deprivation differently from Tibetans?

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Andean Mice Employ Rapid Breathing and Enzyme Modification for Hypoxia, Unlike Tibetan Adaptations

Andean leaf-eared mice have developed unique physiological strategies to survive in low-oxygen environments, primarily by increasing their breathing rate and relying on a modified enzyme, a stark contrast to the known adaptations in Tibetan populations. While both groups exhibit genetic links to hypoxia tolerance, the specific mechanisms employed by the mice offer a distinct approach to oxygen deprivation.
Rapid Respiration as a Primary Mechanism
The study indicates that Andean mice do not follow the typical mammalian response of increasing red blood cell production to enhance oxygen capture. Instead, these mice exhibit a significantly faster breathing rate. This accelerated respiration is a key adaptation that allows them to process available oxygen more efficiently in their high-altitude, low-oxygen habitat.
Reliance on a Modified Enzyme
To manage the potential negative consequences of such rapid breathing, Andean mice utilise a modified enzyme. This enzymatic adaptation is crucial for counteracting any harmful effects that might arise from the increased respiratory rate, thereby maintaining physiological stability in extreme conditions.
Genetic Similarities and Divergent Responses
While the mice share a genetic similarity with Tibetan populations, specifically a gene already identified as being linked to adaptation to hypoxia, their physiological responses diverge. This suggests that while a common genetic basis for tolerating low oxygen may exist, the evolutionary pathways and immediate coping mechanisms have developed differently in these two groups.

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How do Andean mice cope with oxygen deprivation differently from Tibetans?

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