Otros datos de este estudio:
El gen DMRT3 demuestra un origen comun de muchas razas consolidadas y reconocidas en America:
Furthermore, the DMRT3 mutation is very common in horse breeds from both South and North America, particularly in the USA, as proved by several of the American breeds showing complete fixation of the mutant allele (Fig. 1, Table 1). All American breeds are derived from horses originating from Europe, particularly the Iberian Peninsula (Rodero et al. 1992; Vega-Pla et al. 2005; Luis et al. 2006). Although we observed the mutation in Spanish horses, it was present at a very low frequency. Nevertheless, we did not have any samples of the extinct jennet type, which might have been the type of horse first taken to the Western Hemisphere by the early colonisers and which was known to be gaited (Hendricks 1995). Thus, a possible reason for the low frequency of the gait mutation in modern Spanish horses is that ambling is considered a negative trait in most Spanish breeds because the use of horses has changed since the time Spanish conquistadores arrived in the Americas.
En cuanto a nuestro Paso Fino Colombiano, sus parientes (Puertoriqueño y Peruano) y sus descendientes (PFHA) la expresion de este gen DMRT3 en el Paso fino colombiano es del 94,4% (80 caballos), en el Paso fino americano del 95,6% (34 caballos), en el Paso fino puertorriqueño del 99,4% (78 caballos) y en el Paso peruano del 100% (22 caballos).
En nuestros diagonales se expresa este mismo gen en menor frecuencia: 10,4% en la Trocha pura colombiana (entre 67 caballos), del 25% en Trocha y galope (solo 4 caballos) y del 14,3% en Trote y galope colombiano (35 caballos). Es de resaltar que esta muestra es del banco de sangre de la universidad de Davis en
lo reportado en el momento del registro, no representa necesariamente el andar definitivo. http://www.ucm.es/data/cont/docs/345-2014-10-07-gait_keeper_mutation.pdfAhora bien este gen se expresa en razas consolidadas: The researchers demonstrated that a single base change in DMRT3, which resulted in the production of a truncated form of the DMRT3 protein, was the mutation associated with pacing in horses. They developed a diagnostic test for the mutation and discovered that it is widespread among horses that show alternate gaits like Tennessee Walking Horse from the USA and Paso Fino from South America. Moreover, to their surprise, the mutation is very common in horses bred for harness racing.
Un saludo
