scholarly journals The Almond plumage color pattern is associated with eye pigmentation defects in the domestic pigeon (Columba livia)

2020 ◽  
Author(s):  
Rebecca Bruders ◽  
Max Sidesinger ◽  
Michael D. Shapiro
Keyword(s):  
Ciliary Body ◽  
Mutant Allele ◽  
Anterior Segment ◽  
Columba Livia ◽  
Color Pattern ◽  
Retinal Pigmented Epithelium ◽  
Plumage Color ◽  
Domestic Pigeon ◽  
Pigmented Epithelium ◽  
Eye Pigmentation

AbstractChanges in epidermal pigmentation are associated with eye defects in humans and other vertebrates. In the rock pigeon (Columba livia), the sex-linked Almond color pattern is characterized by hypopigmentation of epidermal structures. The trait is controlled by the classical Stipper (St) locus, and homozygous (ZStZSt) Almond males often have severe eye defects. Heterozygous (ZStZ+) and hemizygous (ZStW) pigeons do not typically have obvious eye defects, suggesting that higher dosage of the mutant allele is deleterious. Because Almond pigeons have pronounced hypopigmentation in epidermal structures, we hypothesized that they might also have reduced eye pigmentation. Here, we examined pigmentation in the iris, ciliary body, anterior retinal pigmented epithelium (RPE), and posterior RPE in pigeons with and without Almond alleles. We found that pigmentation of anterior segment structures was reduced in birds with at least one Almond allele. However, posterior eye pigmentation was substantially reduced only in homozygous Almond birds. We postulate that the gradient of effects on eye pigmentation is due to the different embryological origins of anterior and posterior eye pigment-producing cells.

scholarly journals Two Genomic Loci Control Three Eye Colors in the Domestic Pigeon (Columba livia)

2021 ◽  
Author(s):  
Emily T. Maclary ◽  
Bridget Phillips ◽  
Ryan Wauer ◽  
Elena F. Boer ◽  
Rebecca Bruders ◽  
...  
Keyword(s):  
Genetic Basis ◽  
Single Species ◽  
Columba Livia ◽  
Color Pattern ◽  
Color Variation ◽  
Domestic Pigeon ◽  
Eye Color ◽  
Solute Carrier ◽  
Neural Crest Migration ◽  
Domestic Pigeons

ABSTRACTThe iris of the eye shows striking color variation across vertebrate species, and may play important roles in crypsis and communication. The domestic pigeon (Columba livia) has three common iris colors, orange, pearl (white), and bull (dark brown), segregating in a single species, thereby providing a unique opportunity to identify the genetic basis of iris coloration. We used comparative genomics and genetic mapping in laboratory crosses to identify two candidate genes that control variation in iris color in domestic pigeons. We identified a nonsense mutation in the solute carrier SLC2A11B that is shared among all pigeons with pearl eye color, and a locus associated with bull eye color that includes EDNRB2, a gene involved in neural crest migration and pigment development. However, bull eye is likely controlled by a heterogeneous collection of alleles across pigeon breeds. We also found that the EDNRB2 region is associated with regionalized plumage depigmentation (piebalding). Our results establish a genetic link between iris and plumage color, two traits that were long known by pigeon breeders to co-occur, and demonstrate the importance of gene duplicates in establishing possibilities and constraints in the evolution of color and color pattern among vertebrates.

scholarly journals EFFECTS OF CYCLIC AMP AND SEPHADEX FRACTIONS OF CHICK EMBRYO EXTRACT ON CLONED RETINAL PIGMENTED EPITHELIUM IN TISSUE CULTURE

1974 ◽  
Vol 61 (2) ◽  
pp. 369-382 ◽  
Author(s):  
D. A. Newsome ◽  
R. T. Fletcher ◽  
W. G. Robison ◽  
K. R. Kenyon ◽  
G. J. Chader
Keyword(s):  
Molecular Weight ◽  
Chick Embryo ◽  
Adenosine Monophosphate ◽  
Cell Number ◽  
Retinal Pigmented Epithelium ◽  
Culture Dish ◽  
Adhesive Properties ◽  
Embryo Extract ◽  
Chick Embryo Extract ◽  
Pigmented Epithelium

The effects of dibutyryl cyclic 3',5'-adenosine monophosphate (BcAMP) and Sephadex G-25 fractions of chick embryo extract on the growth rate, morphology, and pigmentation of normal chick retinal pigmented epithelium (PE) were investigated. Seven cloned PE cell lines were each grown in modified Ham's F-12 medium alone (F-12), or in F-12 supplemented with either high molecular weight (H) or low molecular weight (L) fractions of chick embryo extract. Cells grown in F-12 alone or in L medium formed compact epithelial sheets, whereas cells grown in H had a fibrocytic appearance and formed poorly organized monolayers. In H plus BcAMP, cell morphology was more epithelioid than in H alone, and generally the monolayers appeared more differentiated. Under each of these three culture conditions, 2 x 10-4 M BCAMP retarded the increase in cell number and decreased the final number of cells per culture dish, but had little effect on plating efficiency. BcAMP also increased the rate of cell adhesion to a plastic substratum. Pigmentation was marked in cultures grown in F-12 or in L alone, but the addition of BcAMP dramatically reduced visible pigmentation. This effect was reversed when BcAMP was removed from the culture medium. Thus BcAMP modifies cell and colonial morphology, rate of cell accumulation, adhesive properties, and pigmentation of normal PE cells.

scholarly journals Five Recombinant Simian Immunodeficiency Virus Pseudotypes Lead to Exclusive Transduction of Retinal Pigmented Epithelium in Rat

2002 ◽  
Vol 6 (4) ◽  
pp. 446-454 ◽  
Author(s):  
Ghislaine Duisit ◽  
Hervé Conrath ◽  
Sylvie Saleun ◽  
Sebastien Folliot ◽  
Nathalie Provost ◽  
...  
Keyword(s):  
Simian Immunodeficiency Virus ◽  
Retinal Pigmented Epithelium ◽  
Immunodeficiency Virus ◽  
Pigmented Epithelium

AGEs Promote Oxidative Stress and Induce Apoptosis in Retinal Pigmented Epithelium Cells RAGE-dependently

2015 ◽  
Vol 56 (2) ◽  
pp. 449-460 ◽  
Author(s):  
Xin-Ling Wang ◽  
Tao Yu ◽  
Qi-Chang Yan ◽  
Wei Wang ◽  
Nan Meng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Retinal Pigmented Epithelium ◽  
Pigmented Epithelium ◽  
Epithelium Cells

scholarly journals transatlantic Movement of Domestic PIGEONS Columba livia domestica

2020 ◽  
Vol 24 (04) ◽  
pp. 781-790
Author(s):  
Gabriel Silva Santos ◽  
◽  
Maurício Brandão Vecchi ◽  
Maria Alice Santos Alves
Keyword(s):  
Scientific Literature ◽  
Columba Livia ◽  
Decision Makers ◽  
Flight Performance ◽  
Intermediate Hosts ◽  
Southwest Atlantic ◽  
Domestic Pigeon ◽  
Scientific Databases ◽  
Eastern Brazil ◽  
Domestic Pigeons

Historically, Domestic pigeon (Columba livia domestica Gmelin,1789) (Columbiformes, Columbidae) breeders use the species to promotes race competitions which over the time could select traits to increase the flight performance and spatial orientation capabilities. Although the species has remarkable navigational abilities, it is possible that these birds sometimes become disoriented pushing the individuals to fly off-course and over distances larger than usual. Here we report a Domestic Pigeon ringed in the Canary Islands (Spain) observed in the Abrolhos Archipelago, eastern Brazil, and compiled similar events (N = 5) in the Southwest Atlantic Ocean coast. Our results indicate that these events are largely unnoticed in the scientific literature as most of them were found in non-scientific newspaper and academic conferences, thus, untraceable from scientific databases as Scopus and Google Scholar. As domestic pigeons are possible intermediate hosts of diseases, we encourage the creation of a systematized database of this kind of movements of these birds, including the profile of these vagrants and the circumstances in which these events occur, which can be a basis to be used for scientists and decision makers.

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