Isolation of a Genomic Region Affecting Most Components of Metabolic Syndrome in a Chromosome-16 Congenic Rat Model

PLoS One. 2016 Mar 31;11(3):e0152708. doi: 10.1371/journal.pone.0152708. eCollection 2016.

Abstract

Metabolic syndrome is a highly prevalent human disease with substantial genomic and environmental components. Previous studies indicate the presence of significant genetic determinants of several features of metabolic syndrome on rat chromosome 16 (RNO16) and the syntenic regions of human genome. We derived the SHR.BN16 congenic strain by introgression of a limited RNO16 region from the Brown Norway congenic strain (BN-Lx) into the genomic background of the spontaneously hypertensive rat (SHR) strain. We compared the morphometric, metabolic, and hemodynamic profiles of adult male SHR and SHR.BN16 rats. We also compared in silico the DNA sequences for the differential segment in the BN-Lx and SHR parental strains. SHR.BN16 congenic rats had significantly lower weight, decreased concentrations of total triglycerides and cholesterol, and improved glucose tolerance compared with SHR rats. The concentrations of insulin, free fatty acids, and adiponectin were comparable between the two strains. SHR.BN16 rats had significantly lower systolic (18-28 mmHg difference) and diastolic (10-15 mmHg difference) blood pressure throughout the experiment (repeated-measures ANOVA, P < 0.001). The differential segment spans approximately 22 Mb of the telomeric part of the short arm of RNO16. The in silico analyses revealed over 1200 DNA variants between the BN-Lx and SHR genomes in the SHR.BN16 differential segment, 44 of which lead to missense mutations, and only eight of which (in Asb14, Il17rd, Itih1, Syt15, Ercc6, RGD1564958, Tmem161a, and Gatad2a genes) are predicted to be damaging to the protein product. Furthermore, a number of genes within the RNO16 differential segment associated with metabolic syndrome components in human studies showed polymorphisms between SHR and BN-Lx (including Lpl, Nrg3, Pbx4, Cilp2, and Stab1). Our novel congenic rat model demonstrates that a limited genomic region on RNO16 in the SHR significantly affects many of the features of metabolic syndrome.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Congenic / genetics*
  • Animals, Congenic / metabolism
  • Animals, Congenic / physiology
  • Chromosomes, Human, Pair 16 / genetics*
  • Genome
  • Glucose Tolerance Test
  • Hemodynamics
  • Humans
  • Male
  • Metabolic Syndrome / genetics*
  • Metabolic Syndrome / metabolism
  • Metabolic Syndrome / physiopathology
  • Metabolome
  • Rats, Inbred BN / genetics*
  • Rats, Inbred BN / metabolism
  • Rats, Inbred BN / physiology
  • Rats, Inbred SHR / genetics*
  • Rats, Inbred SHR / metabolism
  • Rats, Inbred SHR / physiology

Grants and funding

This work was supported by Project LK11217 and LL1204 (within ERC CZ program) from the Ministry of Education, Youth and Sports of the Czech Republic; Charles University in Prague [PRVOUK-P25/LF1/2, UNCE 204022] and by the project “BIOCEV – Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University” (CZ.1.05/1.1.0/02.0109), from the European Regional Development Fund. MP was supported by grants 301/12/0696 from Czech Science Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.