title: Identification of candidate genes related to bovine marbling using protein-protein interaction networks.
abstract: Complex traits are determined by the combined effects of many loci and are affected by gene networks or biological pathways. Systems biology approaches have an important role in the identification of candidate genes related to complex diseases or traits at the system level. The present study systemically analyzed genes associated with bovine marbling score and identified their relationships. The candidate nodes were obtained using MedScan text-mining tools and linked by protein-protein interaction (PPI) from the Human Protein Reference Database (HPRD). To determine key node of marbling, the degree and betweenness centrality (BC) were used. The hub nodes and biological pathways of our network are consistent with the previous reports about marbling traits, and also suggest unknown candidate genes associated with intramuscular fat. Five nodes were identified as hub genes, which was consistent with the network analysis using quantitative reverse-transcription PCR (qRT-PCR). Key nodes of the PPI network have positive roles (PPARγ, C/EBPα, and RUNX1T1) and negative roles (RXRA, CAMK2A) in the development of intramuscular fat by several adipogenesis-related pathways. This study provides genetic information for identifying candidate genes for the marbling trait in bovine.
authors.affiliation: Division of Animal Genomics and Bioinformatics, National Institute of Animal Science, Rural Development Administration, Suwon, Republic of Korea.
authors.forename: Dajeong
authors.initials: D
authors.lastname: Lim
authors.forename: Nam-Kuk
authors.initials: NK
authors.lastname: Kim
authors.forename: Hye-Sun
authors.initials: HS
authors.lastname: Park
authors.forename: Seung-Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Yong-Min
authors.initials: YM
authors.lastname: Cho
authors.forename: Sung Jong
authors.initials: SJ
authors.lastname: Oh
authors.forename: Tae-Hun
authors.initials: TH
authors.lastname: Kim
authors.forename: Heebal
authors.initials: H
authors.lastname: Kim
mesh_terms: D050154:Adiposity / Q000235:genetics*; D000818:Animals; D002417:Cattle / Q000235:genetics*; D010641:Phenotype; D060066:Protein Interaction Maps; D040641:Quantitative Trait Loci; D012044:Regression Analysis