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Classification of retinal ganglion cells in the southern hemisphere lamprey Geotria australis (Cyclostomata)

Overview of attention for article published in The Journal of Comparative Neurology, January 2014
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Title
Classification of retinal ganglion cells in the southern hemisphere lamprey Geotria australis (Cyclostomata)
Published in
The Journal of Comparative Neurology, January 2014
DOI 10.1002/cne.23441
Pubmed ID
Authors

Lee Norman Fletcher, João Paulo Coimbra, Jennifer Rodger, Ian C. Potter, Howard S. Gill, Sarah A. Dunlop, Shaun P. Collin

Abstract

Lampreys are one of two extant representatives of the earliest group of vertebrates, the agnathans or jawless fishes. The single species of the southern hemisphere lamprey family Geotriidae, Geotria australis, possesses the potential for pentachromatic color discrimination opposed to the mono- or dichromacy found in other lampreys. However, little is known of the retinal ganglion cell types that contribute to visual processing in G. australis. A quantitative morphological approach was used to distinguish and describe retinal ganglion cell types in G. australis. The morphology of retinal ganglion cells was revealed by retrograde biocytin labeling from the optic disc. Cells were digitally reconstructed, and somatic area and position and dendritic field size, density, tortuosity, and stratification were subjected to quantitative morphometric analyses. Cluster analysis, in conjunction with similarity profile analysis (SIMPROF), statistically identified five discrete monostratified retinal ganglion cell types, one of which may comprise two subtypes. Two bistratified types were identified separately, including a biplexiform and a bistratified subtype. The use of cluster analysis with SIMPROF provided a robust statistical technique for objectively identifying cell types whose characteristics were similar and significantly different from those of other types and thus provides an objective resolution of the problems posed by "lumpers vs. splitters" when designating cell types. The diversity of retinal ganglion cells suggests that visual information in the lamprey G. australis is processed in parallel streams, as in gnathostomes. These findings, together with the results of previous studies, indicate that the visual system of the lamprey G. australis represents the upper limit of visual complexity in extant agnathans.

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Geographical breakdown

Country Count As %
Unknown 20 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 4 20%
Student > Master 3 15%
Researcher 3 15%
Student > Doctoral Student 2 10%
Lecturer 1 5%
Other 4 20%
Unknown 3 15%
Readers by discipline Count As %
Agricultural and Biological Sciences 6 30%
Medicine and Dentistry 4 20%
Neuroscience 3 15%
Biochemistry, Genetics and Molecular Biology 2 10%
Engineering 1 5%
Other 0 0%
Unknown 4 20%