<div>Insulin-like growth factor 1 receptor (IGF1R) is one component of insulin-like growth factor system, which has biological functions of growth traits. The aim of this study is to investigate the entire exons of IGF1R in the three commercial pig breeds, Duroc, Yorkshire and Landrace, to identify novel single nucleotide polymorphisms and their correlation with growth traits. One novel SNP (c.3678C&gt;T) in the exon 20 was detected. This SNP caused the change of amino acid (Ser1217Phe), a portion of cytoplasmic tyrosine kinase domain of IGF1R. At the c.3678C&gt;T site, three genotypes were significantly associated with average daily gain at different growth stage in Yorkshire and Landrace breeds. Meanwhile, we identified the differently expressed pattern of IGF1R in muscle of Yorkshire and Jinhua pigs at different growth stages. Our results provide useful information on understanding the effect of porcine IGF1R gene on growth. The novel IGF1R polymorphism may be useful as molecular markers in pig selection but future studies are required.</div>


<div>Association of <em>IGF1R</em> Polymorphisms with Growth Traits and its Expression Profiles in Different Pig Breeds</div>


<div style="text-align: justify;">Insulin like growth factor 1receptors (IGF-1R) are the proteins which are expressed on the cell surface of almost all tissues in human as well as domestic animals with major involvement in growth, cancer, aging, production and in early embryonic development. Due to above importance, this protein needs to be characterized both in physiochemical and phylogenetically for further exploration in livestock research. &nbsp;In this study, the IGF1R amino acid sequences of selected domestic animals are retrieved from UniProt database and various physiochemical parameters were compared through ProtParam insilco tool. The multiple sequence alignment (MSA) and phylogenetic analysis was performed through Clustal omega and Molecular evolutionary genetics analysis (MEGA) application platform respectively. It was found that this protein is an unstable, hydrophilic in all domestic animals with amino acids varied from 1307 to 1412 in number. The phylogenetic analysis showed that highest time of divergence occurs in killer whale and rabbit, but least time of divergence occurs between goat and bovine. So this study will provide a better platform for the development of suitable anticancer therapeutics in domestic animals in nearest future as IGF-1R is implicated in several cancers, including breast, prostate, and lung cancers.</div>

Association of IGF1R Polymorphisms with Growth Traits and its Expression Profiles in Different Pig Breeds

Comparative Insilco physiochemical and phylogenetic analysis of Insulin like growth factor 1 receptor (IGF-1R) in domestic animals