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Growth is a priority trait from the point of view of genetic improvement. Molecular markers linked to quantitative trait loci (QTL) have been regarded as useful for marker-assisted selection in complex traits as growth. Polymorphisms have been studied in five candidate genes influencing growth in gilthead seabream ( Sparus aurata ): the growth hormone ( GH ), insulin-like growth factor-1 ( IGF-1 ), myostatin ( MSTN-1 ), prolactin ( PRL ), and somatolactin ( SL ) genes. Specimens evaluated were from a commercial broodstock comprising 131 breeders (from which 36 males and 44 females contributed to the progeny). In all samples eleven gene fragments, covering more than 13,000 bp, generated by PCR-RFLP, were analyzed; tests were made for significant associations between these markers and growth traits. ANOVA results showed a significant association between  MSTN-1  gene polymorphism and growth traits. Pairwise tests revealed several RFLPs in the  MSTN-1  gene with significant heterogeneity of genotypes among size groups.  PRL  and  MSTN-1  genes presented linkage disequilibrium. The  MSTN-1  gene was mapped in the centromeric region of a medium-size acrocentric chromosome pair.

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Assessment of Tools for Marker-Assisted Selection in a Marine Commercial Species: Significant Association between MSTN-1 Gene Polymorphism and Growth Traits