Expression of carnitine palmitoyl-CoA transferase-1B is influenced by a cis-acting eQTL in two chicken lines selected for high and low body weight

Sojeong Ka, Ellen Markljung, Henrik Ring, Frank W. Albert, Mohammad Harun-Or-Rashid, Per Wahlberg, Pablo M. Garcia-Roves, Juleen R. Zierath, D. Michael Denbow, Svante Pääbo, Paul B. Siegel, Leif Andersson, Finn Hallböök

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Carnitine palmitoyl-CoA transferase-1B is a mitochondrial enzyme in the fatty acid oxidation pathway. In a previous study, CPT1B was identified as differentially expressed in the hypothalamus of two lines of chickens established by long-term selection for high (HWS) or low (LWS) body weight. Mammals have three paralogs (CPT1a, b and c) while nonmammalian vertebrates only have two (CPT1A, B). CPT1A is expressed in liver and CPT1B in muscle. CPT1c is expressed in hypothalamus, where it regulates feeding and energy expenditure. We identified an intronic length polymorphism, fixed for different alleles in the two populations, and mapped the hitherto missing CPT1B locus in the chicken genome assembly, to the distal tip of chromosome 1p. Based on molecular phylogeny and gene synteny we suggest that chicken CPT1B is pro-orthologous of the mammalian CPT1c. Chicken CPT1B was differentially expressed in both muscle and hypothalamus but in opposite directions: higher levels in hypothalamus but lower levels in muscle in the HWS than in the LWS line. Using an advanced intercross population of the lines, we found CPT1B expression to be influenced by a cis-acting expression quantitative trait locus in muscle. The increased expression in hypothalamus and reduced expression in muscle is consistent with an increased food intake in the HWS line and at the same time reduced fatty acid oxidation in muscle yielding a net accumulation of energy intake and storage. The altered expression of CPT1B in hypothalamus and peripheral tissue is likely to be a mechanism contributing to the remarkable difference between lines.

Original languageEnglish (US)
Pages (from-to)367-376
Number of pages10
JournalPhysiological genomics
Volume45
Issue number9
DOIs
StatePublished - 2013

Keywords

  • Body weight
  • Chromosomal mapping
  • Fatty acid
  • Genotyping
  • Hypothalamus
  • Lipid metabolism
  • Malonyl-CoA
  • Mitochondria
  • Pectoral muscle
  • Skeletal muscle
  • mRNA expression

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