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Prospecting candidate SNPs for backfat in Canchim beef cattle
G B Veneroni1, S L Meirelles, D A Grossi
1Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP, Brasil.
Genetics and Molecular Research : GMR
|October 20, 2010
Summary
Researchers identified genetic markers in Canchim cattle to improve beef production by increasing fat deposition. A specific DDEF1 gene SNP significantly impacted backfat thickness, offering a potential tool for breeding programs.
Area of Science:
- Animal Genetics
- Beef Cattle Breeding
- Genomics
Background:
- Canchim cattle, a Brazilian composite breed, are bred for beef production with an emphasis on increasing fat deposition.
- Quantitative Trait Loci (QTLs) associated with fat thickness and marbling are located on cattle chromosomes BTA4 and BTA14.
- The Insulin-like Growth Factor Binding Protein 3 (IGFBP3) and Developmental Downstream Regulatory Protein 1 (DDEF1) genes, located on BTA4 and BTA14 respectively, play roles in adipogenesis.
Purpose of the Study:
- To identify Single Nucleotide Polymorphisms (SNPs) within the IGFBP3 and DDEF1 genes in Canchim cattle.
- To investigate the association between these identified SNPs and backfat thickness, a key trait for beef production.
Main Methods:
- Selection of extreme sires (highest and lowest breeding values for fat thickness) for SNP discovery.
- Sequencing of specific regions within the IGFBP3 and DDEF1 genes using the Sanger method.
- Genotyping of selected SNPs (DDEF1g.279401A>G and IGFBP3c.4394T>C) in the entire Canchim population.
Main Results:
- Nine SNPs were identified in IGFBP3 and 76 SNPs in DDEF1.
- A significant effect (P ≤ 0.05) of allele substitution was observed for the DDEF1g.279401A>G SNP on backfat thickness.
- The IGFBP3c.4394T>C SNP did not show a significant association with backfat thickness in this study.
Conclusions:
- The DDEF1 gene contains SNPs that are significantly associated with backfat thickness in Canchim cattle.
- The identified DDEF1 SNP offers a potential genetic marker for marker-assisted selection in beef cattle breeding programs aimed at enhancing fat deposition.
