한빛사논문
- 조회516
Yeon Jin Kim 1, Orin Packer 1, Andreas Pollreisz 2, Paul R Martin 3, Ulrike Grünert 3, Dennis M Dacey 1, 4
1Department of Biological Structure, University of Washington, Seattle, WA 98195.
2Department of Ophthalmology, Medical University of Vienna, Vienna 1090, Austria.
3Save Sight Institute and Department of Ophthalmology, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2000, Australia.
4Washington National Primate Research Center, University of Washington, Seattle, WA 98195.
To whom correspondence may be addressed.: Dennis M Dacey
Abstract
The Old World macaque monkey and New World common marmoset provide fundamental models for human visual processing, yet the human ancestral lineage diverged from these monkey lineages over 25 Mya. We therefore asked whether fine-scale synaptic wiring in the nervous system is preserved across these three primate families, despite long periods of independent evolution. We applied connectomic electron microscopy to the specialized foveal retina where circuits for highest acuity and color vision reside. Synaptic motifs arising from the cone photoreceptor type sensitive to short (S) wavelengths and associated with "blue-yellow" (S-ON and S-OFF) color-coding circuitry were reconstructed. We found that distinctive circuitry arises from S cones for each of the three species. The S cones contacted neighboring L and M (long- and middle-wavelength sensitive) cones in humans, but such contacts were rare or absent in macaques and marmosets. We discovered a major S-OFF pathway in the human retina and established its absence in marmosets. Further, the S-ON and S-OFF chromatic pathways make excitatory-type synaptic contacts with L and M cone types in humans, but not in macaques or marmosets. Our results predict that early-stage chromatic signals are distinct in the human retina and imply that solving the human connectome at the nanoscale level of synaptic wiring will be critical for fully understanding the neural basis of human color vision.
논문정보
- Research article
- 2023년 05월 (BRIC 등록일 2023-05-03)
- 국외 연구진
- 생명과학 > 세포생물학
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