In:
eLife, eLife Sciences Publications, Ltd, Vol. 9 ( 2020-08-25)
Abstract:
Previously, we showed that the evolution of high acuity vision in fishes was directly associated with their unique pH-sensitive hemoglobins that allow O 2 to be delivered to the retina at PO 2 s more than ten-fold that of arterial blood (Damsgaard et al., 2019). Here, we show strong evidence that vacuolar-type H + -ATPase and plasma-accessible carbonic anhydrase in the vascular structure supplying the retina act together to acidify the red blood cell leading to O 2 secretion. In vivo data indicate that this pathway primarily affects the oxygenation of the inner retina involved in signal processing and transduction, and that the evolution of this pathway was tightly associated with the morphological expansion of the inner retina. We conclude that this mechanism for retinal oxygenation played a vital role in the adaptive evolution of vision in teleost fishes.
Type of Medium:
Online Resource
ISSN:
2050-084X
Language:
English
Publisher:
eLife Sciences Publications, Ltd
Publication Date:
2020
detail.hit.zdb_id:
2687154-3
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