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A group including Osaka Metropolitan University researchers discovered that the rhodopsin a protein in the eye that detects light of whale sharks has changed to efficiently detect blue light, which penetrates deep-sea water easily. The amino acid substitutions–one of which is counterintuitively associated with congenital stationary night blindness in humans aid in detecting the low levels of light in the deep-sea. Although these changes make the whale shark rhodopsin less thermally stable the deep-sea temperature, allows their rhodopsin to keep working. This suggests that the unique adaptation evolved to function in the low-light low-temperature environment where whale sharks live.

Mitsumasa koyanagiAkihisa terakitaProceedings of the national academy sciencesOsaka city universityOsaka prefecture universityOsaka metropolitan universityOsaka metropolitan university graduate school of scienceMethod of researchProfessors mitsumasa koyanagiOsaka metropolitan university graduate schoolNational academyMetropolitan universityOsaka prefecture