Polimorfismos en genes candidatos a la composición de ácidos grasos y su efecto en carne Wagyu-Cross

Candidate gene polymorphism effects on the fatty acid composition of Wagyu-Cross beef

Objetivo. Comparar la composición de ácidos grasos (FA) en la carne Wagyu y sus cruzas con Angus, Beefmaster, Brangus y Hereford, y analizar su relación con marcadores genéticos del metabolismo lipídico. Materiales y metodos. Se colectaron 111 muestras de Longissimus dorsi, las cuales se agruparon por grupo genético, se cuantificaron los FA (cromatografía de gases líquidos) y se tipificaron marcadores de ADN asociados teóricamente a FA. Se examinó el equilibrio de Hardy-Weinberg y desequilibrio de ligamiento de los marcadores y se estimó el efecto de las cruzas y el efecto de los genotipos. Resultados. Las cruzas no mostraron diferencias substanciales en la composición de FA con respecto a Wagyu. Nueve SNPs mostraron asociación con la composición de FA, y se encontró un efecto importante en el marcador SLC2A4 ss62538460, el cual influyó sobre SFA, MUFA y MUFA/SFA. Los marcadores, PLTP ss77832104 y IGF2R ss77831885 influyeron sobre C16:0, MYOZ1 ss77832104 sobre C17:1 y PPARGC1A c.1892+19 sobre C18:2. Además, se comprobaron efectos previamente descritos de MEF2C ss38329156 y SCD c.878. Conclusiones. Los presentes resultados representan una de las primeras evidencias sobre la deposición de FA en ganado Wagyu y sus cruzas y propone algunos loci en genes candidatos con posibilidad de implementación en estrategias de mejoramiento asistido.

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