A Cambrian origin for vertebrate rods
Vertebrates acquired dim-light vision when an ancestral cone evolved into the rod photoreceptor at an unknown stage preceding the last common ancestor of extant jawed vertebrates (∼420 million years ago Ma). The jawless lampreys provide a unique opportunity to constrain the timing of this advance, a...
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doaj-4075c03c3c6641c7b23707b4ad6cd1de2021-05-04T23:52:55ZengeLife Sciences Publications LtdeLife2050-084X2015-06-01410.7554/eLife.07166A Cambrian origin for vertebrate rodsSabrina Asteriti0Sten Grillner1Lorenzo Cangiano2Department of Translational Research, University of Pisa, Pisa, ItalyDepartment of Neuroscience, Karolinska Institute, Stockholm, SwedenDepartment of Translational Research, University of Pisa, Pisa, ItalyVertebrates acquired dim-light vision when an ancestral cone evolved into the rod photoreceptor at an unknown stage preceding the last common ancestor of extant jawed vertebrates (∼420 million years ago Ma). The jawless lampreys provide a unique opportunity to constrain the timing of this advance, as their line diverged ∼505 Ma and later displayed high-morphological stability. We recorded with patch electrodes the inner segment photovoltages and with suction electrodes the outer segment photocurrents of Lampetra fluviatilis retinal photoreceptors. Several key functional features of jawed vertebrate rods are present in their phylogenetically homologous photoreceptors in lamprey: crucially, the efficient amplification of the effect of single photons, measured by multiple parameters, and the flow of rod signals into cones. These results make convergent evolution in the jawless and jawed vertebrate lines unlikely and indicate an early origin of rods, implying strong selective pressure toward dim-light vision in Cambrian ecosystems.https://elifesciences.org/articles/07166photoreceptorlampreyrodretinaevolution |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sabrina Asteriti Sten Grillner Lorenzo Cangiano |
spellingShingle |
Sabrina Asteriti Sten Grillner Lorenzo Cangiano A Cambrian origin for vertebrate rods eLife photoreceptor lamprey rod retina evolution |
author_facet |
Sabrina Asteriti Sten Grillner Lorenzo Cangiano |
author_sort |
Sabrina Asteriti |
title |
A Cambrian origin for vertebrate rods |
title_short |
A Cambrian origin for vertebrate rods |
title_full |
A Cambrian origin for vertebrate rods |
title_fullStr |
A Cambrian origin for vertebrate rods |
title_full_unstemmed |
A Cambrian origin for vertebrate rods |
title_sort |
cambrian origin for vertebrate rods |
publisher |
eLife Sciences Publications Ltd |
series |
eLife |
issn |
2050-084X |
publishDate |
2015-06-01 |
description |
Vertebrates acquired dim-light vision when an ancestral cone evolved into the rod photoreceptor at an unknown stage preceding the last common ancestor of extant jawed vertebrates (∼420 million years ago Ma). The jawless lampreys provide a unique opportunity to constrain the timing of this advance, as their line diverged ∼505 Ma and later displayed high-morphological stability. We recorded with patch electrodes the inner segment photovoltages and with suction electrodes the outer segment photocurrents of Lampetra fluviatilis retinal photoreceptors. Several key functional features of jawed vertebrate rods are present in their phylogenetically homologous photoreceptors in lamprey: crucially, the efficient amplification of the effect of single photons, measured by multiple parameters, and the flow of rod signals into cones. These results make convergent evolution in the jawless and jawed vertebrate lines unlikely and indicate an early origin of rods, implying strong selective pressure toward dim-light vision in Cambrian ecosystems. |
topic |
photoreceptor lamprey rod retina evolution |
url |
https://elifesciences.org/articles/07166 |
work_keys_str_mv |
AT sabrinaasteriti acambrianoriginforvertebraterods AT stengrillner acambrianoriginforvertebraterods AT lorenzocangiano acambrianoriginforvertebraterods AT sabrinaasteriti cambrianoriginforvertebraterods AT stengrillner cambrianoriginforvertebraterods AT lorenzocangiano cambrianoriginforvertebraterods |
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