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Screening for candidate genes related with histological microstructure, meat quality and carcass characteristic in pig based on RNA-seq data

  • Ropka-Molik, Katarzyna (Department of Genomics and Animal Molecular Biology, National Research Institute of Animal Production) ;
  • Bereta, Anna (Department of Animal Genetics and Breeding, National Research Institute of Animal Production) ;
  • Zukowski, Kacper (Department of Animal Genetics and Breeding, National Research Institute of Animal Production) ;
  • Tyra, Miroslaw (Department of Animal Genetics and Breeding, National Research Institute of Animal Production) ;
  • Piorkowska, Katarzyna (Department of Genomics and Animal Molecular Biology, National Research Institute of Animal Production) ;
  • Zak, Grzegorz (Department of Animal Genetics and Breeding, National Research Institute of Animal Production) ;
  • Oczkowicz, Maria (Department of Genomics and Animal Molecular Biology, National Research Institute of Animal Production)
  • 투고 : 2017.09.21
  • 심사 : 2018.03.05
  • 발행 : 2018.10.01

초록

Objective: The aim of the present study was to identify genetic variants based on RNA-seq data, obtained via transcriptome sequencing of muscle tissue of pigs differing in muscle histological structure, and to verify the variants' effect on histological microstructure and production traits in a larger pig population. Methods: RNA-seq data was used to identify the panel of single nucleotide polymorphisms (SNPs) significantly related with percentage and diameter of each fiber type (I, IIA, IIB). Detected polymorphisms were mapped to quantitative trait loci (QTLs) regions. Next, the association study was performed on 944 animals representing five breeds (Landrace, Large White, Pietrain, Duroc, and native Puławska breed) in order to evaluate the relationship of selected SNPs and histological characteristics, meat quality and carcasses traits. Results: Mapping of detected genetic variants to QTL regions showed that chromosome 14 was the most overrepresented with the identification of four QTLs related to percentage of fiber types I and IIA. The association study performed on a 293 longissimus muscle samples confirmed a significant positive effect of transforming acidic coiled-coil-containing protein 2 (TACC2) polymorphisms on fiber diameter, while SNP within forkhead box O1 (FOXO1) locus was associated with decrease of diameter of fiber types IIA and IIB. Moreover, subsequent general linear model analysis showed significant relationship of FOXO1, delta 4-desaturase, sphingolipid 1 (DEGS1), and troponin T2 (TNNT2) genes with loin 'eye' area, FOXO1 with loin weight, as well as FOXO1 and TACC2 with lean meat percentage. Furthermore, the intramuscular fat content was positively associated (p<0.01) with occurrence of polymorphisms within DEGS1, TNNT2 genes and negatively with occurrence of TACC2 polymorphism. Conclusion: This study's results indicate that the SNP calling analysis based on RNA-seq data can be used to search candidate genes and establish the genetic basis of phenotypic traits. The presented results can be used for future studies evaluating the use of selected SNPs as genetic markers related to muscle histological profile and production traits in pig breeding.

키워드

QTLs;Candidate Genes;Polymorphism;Histological Traits;Fibers Types

과제정보

연구 과제 주관 기관 : National Research Institute of Animal Production

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