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Effect of the porcine IGF2-intron3-G3072A substitution in an outbred Large White population and in an Iberian x Landrace cross¹

J. Estellé^*,2, A. Mercadé^*, J. L. Noguera, M. Pérez-Enciso^*,, C. Óvilo, A. Sánchez^* and J. M. Folch^*

^* Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain; and Àrea de Producció Animal, Centre UdL-IRTA, C/Alcalde Rovira Roure 177, 25198, Lleida, Spain; and Institut Català de Recerca i Estudis Avançats, C/Lluis Companys 23, 08010, Barcelona, Spain; and and Dpto. Mejora Genética Animal SGIT-INIA, Ctra. De la Coruña Km. 7, 28040, Madrid, Spain

² Correspondence—phone: 34 93 581 4260; fax: 34 93 581 2106; e-mail: Jordi.Estelle{at}uab.es.

The IGF2-intron3-G3072A substitution has been recently described as the causal factor of the imprinted QTL for fat deposition and muscle growth detected within the porcine IGF2 region. The objective of this study was to investigate the IGF2 substitution effect in a Large White outbred population and in an Iberian x Landrace F₂ cross. The results showed that the substitution has significant effects on fatness, growth, and shape traits with estimated effects in the expected direction. These results agree with those obtained in the F₂ cross, where the IGF2-intron3-G3072A substitution is segregating only in a small family. In addition, a QTL scan has been performed in the F₂ population for the traits used in the IGF2 substitution effect validation. Results of this study demonstrated that there are QTL segregating in swine chromosome 2 other than the IGF2 substitution for carcass weight, LM area, and pH measured at 24 h after slaughter. The results confirm the relevance of the IGF2 substitution, but they also show that there are still valuable mutations to be revealed in this chromosome.

Key Words: Fatness • Growth • IGF2 • Pig • Quantitative Trait Loci

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