Fecha/hora: 07/06/2024 20:24:49

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	14/06/2022	
Fecha de la última actualización: 	14/06/2022	
Autoria: 	JARA, E.; PEÑAGARICANO, F.; ARMSTRONG, E.; CIAPPESONI, G.; IRIARTE, A.; NAVAJAS, E.	
Afiliación: 	EUGENIO JARA, Unidad de Genética y Mejora Animal, Departamento de Producción Animal, Facultad de Veterinaria, Universidad de la República, Montevideo 11600, Uruguay; FRANCISCO PEÑAGARICANO, Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706, United State; EILEEN ARMSTRONG, Unidad de Genética y Mejora Animal, Departamento de Producción Animal, Facultad de Veterinaria, Universidad de la República, 11600, Montevideo, Uruguay; CARLOS GABRIEL CIAPPESONI SCARONE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ANDRÉS IRIARTE, Laboratorio de Biología Computacional, Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, 11600, Montevideo, Uruguay; ELLY ANA NAVAJAS VALENTINI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Revealing the genetic basis of eyelid pigmentation in Hereford cattle.	
Año de publicación: 	2022	
Fuente/Imprenta: 	Journal of Animal Science, 2022, Volume 100, Issue 5. doi: https://doi.org/10.1093/jas/skac110	
ISSN: 	1525-3163	
DOI: 	10.1093/jas/skac110	
Idioma: 	Inglés	
Notas: 	Article history: Received December 14, 2021; Accepted April 4, 2022; Advance access publication 7 April 2022.
Corresponding author: Eugenio Jara, email: eugeniojara19@gmail.com --	
Contenido: 	ABSTRACT - Ocular squamous cell carcinoma and infectious keratoconjunctivitis are common ocular pathologies in Hereford cattle with considerable economic impact. Both pathologies have been associated with low eyelid pigmentation, and thus, genetic selection for higher eyelid pigmentation could reduce their incidence. The objective of the present study was to reveal the genetic basis of eyelid pigmentation in Hereford cattle. The analysis included a single-step genome-wide association study (ssGWAS) and a subsequent gene-set analysis in order to identify individual genes, genetic mechanisms, and biological pathways implicated in this trait. Data consisted of eyelid pigmentation records in 1,165 Hereford bulls and steers, visually assessed in five categories between 0% and 100%. Genotypic data for 774,660 single-nucleotide polymorphism markers were available for 886 animals with pigmentation records. Pedigree information of three generations of ancestors of animals with phenotype was considered in this study, with a total of 4,929 animals. Our analyses revealed that eyelid pigmentation is a moderately heritable trait, with heritability estimates around 0.41. The ssGWAS identified at least eight regions, located on BTA1, BTA3, BTA5, BTA14, BTA16, BTA18, BTA19, and BTA24, associated with eyelid pigmentation. These regions harbor genes that are directly implicated in melanocyte biology and skin pigmentation, such as ADCY8, PLD1, KITLG, and PRKCA. The gene-set analysis revealed several functional terms closely related to melanogenesis, such as positive regulation of melanocyte differentiation and regulation of ERK1 and ERK2 cascade. Overall, our findings provide evidence that eyelid pigmentation is a heritable trait influenced by many loci. Indeed, the ssGWAS detected several candidate genes that are directly implicated in melanocyte biology, including melanogenesis. This study contributes to a better understanding of the genetic and biological basis of eyelid pigmentation and presents novel information that could aid to design breeding strategies for reducing the incidence of ocular pathologies in cattle. Additional research on the genetic link between eyelid pigmentation and ocular pathologies is needed. © The Author(s) 2022.	
Palabras-Clave: 	Beef cattle; Melanocyte biology; Ocular pathologies.	
Categoría del tema: 	L01 Ganadería	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103099-1) - PXI - AP - DD - Jr.Animal Science/2022 -  -  - DIS