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The Correlation Of Coat Color On Olfactory Bulb Layering In The Female American Mink (Neovison Vison Var. Spec.)

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Weiler,  E
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Bennegger, W., & Weiler, E. (2018). The Correlation Of Coat Color On Olfactory Bulb Layering In The Female American Mink (Neovison Vison Var. Spec.). Poster presented at 40th Annual Meeting of the Association for Chemoreception Sciences: AChemS XL, Bonita Springs, FL, USA.


Cite as: https://hdl.handle.net/21.11116/0000-0001-7DF6-E
Abstract
The neuronal system is only in a few areas a „colored“ system, such as the substantia nigra, which received its
name by the dark color based on the neuromelanin of dopaminergic neurons. Melanin is a pigment of skin and
hair, so the question arose, if there might be a correlation of the coat color and brain areas containing dopaminergic neurons such as the olfactory bulb. Therefore we investigated the olfactory bulbs of female American minks bred specifically for their coat color and measured the absolute layer volumes of the four color varieties: dark black “standard” (Neovison vison var. atratus, a), light black “silverblue” (Neovison vison var. glaucus, g), light brown “pastel” (Neovison vison var. suffuscus, s), dark brown “wild” (Neovison vison var. carinum, c) using a morphometric system. The volume of the glomerular layer, including the periglomerular dopaminergic neurons, revealed a significant difference between the pale brown variety (suffuscus: 20.68±4.73mm3) versus the black varieties (glaucus: 14.79±0.91mm3 and atratus: 15.35±1.21mm3). Significant differences were also observed in the mitral cell layer (including passing periglomerular cells) of suffuscus (5.30±1.55mm3) versus the black varieties glaucus (3.54±0.65mm3) and atratus (3.78±0.37mm3) and in the
internal plexiform layer (s: 5.36±0.86mm3; significant different vs g: 3.54±0.65 mm3 and a: 2.90±0.33mm3). No
differences were found among any of the color varieties in the volumes of the fila, external plexiform, granule
cell and subependymal layer, which are all composed of much fewer or no dopaminergic neurons. Our results indicate that, based on gene expression, the coat color might reflect neuronal structures.