Physiological and Genetic Adaptations to Diving in Sea Nomads

Area of Science:

• Human physiology
• Genetics
• Evolutionary biology

Background:

• Human hypoxia tolerance is medically significant but primarily studied in high-altitude populations.
• Breath-hold diving populations, like the Bajau people, represent an unexplored system for studying adaptation to low oxygen conditions.
• The Bajau's exceptional breath-holding abilities suggest potential genetic underpinnings.

Purpose of the Study:

• To investigate the genetic basis of extraordinary breath-holding abilities in the Bajau people.
• To explore novel human adaptations to hypoxia tolerance through the study of a diving population.

Main Methods:

• Comparative genomic study of the Bajau people.
• Analysis of genetic variants and their association with physiological traits related to hypoxia tolerance.

Main Results:

• Evidence of natural selection on the PDE10A gene, leading to increased spleen size in the Bajau.
• A larger spleen provides a greater reservoir of oxygenated red blood cells.
• Strong, Bajau-specific selection was found on BDKRB2, a gene influencing the human diving reflex.

Conclusions:

• The Bajau exhibit genetic adaptations for hypoxia tolerance, including increased spleen size and modified diving reflex.
• These findings highlight the Bajau as a valuable model for studying human adaptation to low oxygen environments.
• This research opens new avenues for understanding the genetic mechanisms of survival in challenging physiological conditions.