Mammalian Genome

, 22:563

Fine-mapping alleles for body weight in LG/J × SM/J F2 and F34 advanced intercross lines

  • Clarissa C. Parker
  • Riyan Cheng
  • Greta Sokoloff
  • Jackie E. Lim
  • Andrew D. Skol
  • Mark Abney
  • Abraham A. Palmer
Article

DOI: 10.1007/s00335-011-9349-z

Cite this article as:
Parker, C.C., Cheng, R., Sokoloff, G. et al. Mamm Genome (2011) 22: 563. doi:10.1007/s00335-011-9349-z

Abstract

The present study measured variation in body weight using a combined analysis in an F2 intercross and an F34 advanced intercross line (AIL). Both crosses were derived from inbred LG/J and SM/J mice, which were selected for large and small body size prior to inbreeding. Body weight was measured at 62 (±5) days of age. Using an integrated GWAS and forward model selection approach, we identified 11 significant QTLs that affected body weight on ten different chromosomes. With these results we developed a full model that explained over 18% of the phenotypic variance. The median 1.5-LOD support interval was 5.55 Mb, which is a significant improvement over most prior body weight QTLs. We identified nonsynonymous coding SNPs between LG/J and SM/J mice in order to further narrow the list of candidate genes. Three of the genes with nonsynonymous coding SNPs (Rad23b, Stk33, and Anks1b) have been associated with adiposity, waist circumference, and body mass index in human GWAS, thus providing evidence that these genes may underlie our QTLs. Our results demonstrate that a relatively small number of loci contribute significantly to the phenotypic variance in body weight, which is in marked contrast to the situation in humans. This difference is likely to be the result of strong selective pressure and the simplified genetic architecture, both of which are important advantages of our system.

Supplementary material

335_2011_9349_MOESM1_ESM.tif (857 kb)
Supplementary material 1 (TIF 857 kb)
335_2011_9349_MOESM2_ESM.pdf (324 kb)
Supplementary material 2 (PDF 324 kb)
335_2011_9349_MOESM3_ESM.xls (45 kb)
Supplementary material 3 (XLS 45 kb)
335_2011_9349_MOESM4_ESM.xlsx (14 kb)
Supplementary material 4 (XLSX 14 kb)

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Clarissa C. Parker
    • 1
  • Riyan Cheng
    • 1
  • Greta Sokoloff
    • 1
  • Jackie E. Lim
    • 2
  • Andrew D. Skol
    • 3
  • Mark Abney
    • 1
  • Abraham A. Palmer
    • 1
    • 4
  1. 1.Department of Human GeneticsUniversity of ChicagoChicagoUSA
  2. 2.Departments of Pharmacology and Cancer BiologyDuke University School of MedicineDurhamUSA
  3. 3.Department of Medicine, Section for Genetic MedicineUniversity of ChicagoChicagoUSA
  4. 4.Departments of Psychiatry and Behavioral NeuroscienceUniversity of ChicagoChicagoUSA