Quantitative trait loci for biomechanical performance and femoral geometry in an intercross of recombinant congenic mice: restriction of the Bmd7 candidate interval. FASEB J 2009 Jul;23(7):2142-54
Date
03/06/2009Pubmed ID
19261723DOI
10.1096/fj.08-118679Scopus ID
2-s2.0-68549101901 (requires institutional sign-in at Scopus site) 24 CitationsAbstract
Despite steady progress in identifying quantitative trait loci (QTLs) for bone phenotypes, relatively little progress has been made in moving from QTLs to identifying the relevant gene. We exploited the genetic structure of recombinant congenic mouse strains by performing a reciprocal intercross of the strains HcB-8 and HcB-23, phenotyped for body size, femoral biomechanical performance, and femoral diaphyseal geometry and mapped with R/qtl and QTL Cartographer. Significant QTLs are present on chromosomes 1, 2, 3, 4, 6, and 10. We found significant sex x QTL and cross-direction x QTL interactions. The chromosome 4 QTL affects multiple femoral anatomic features and biomechanical properties. The known segregating segment of chromosome 4 contains only 18 genes, among which Ece1, encoding endothelin-converting enzyme 1, stands out as a candidate. Endothelin signaling has been shown to promote the growth of osteoblastic metastases and to potentiate signaling via the Wnt pathway. The colocalizing chromosome 4 QTL Bmd7 (for bone mineral density 7) increases responsiveness to mechanical loading. By exploiting the short informative segment of chromosome 4 and the known biology, we propose that Ece1 is the gene responsible for Bmd7 and that it acts by increasing responsiveness to mechanical loading through modulation of Wnt signaling.
Author List
Saless N, Litscher SJ, Lopez Franco GE, Houlihan MJ, Sudhakaran S, Raheem KA, O'Neil TK, Vanderby R, Demant P, Blank RDMESH terms used to index this publication - Major topics in bold
AnimalsAspartic Acid Endopeptidases
Biomechanical Phenomena
Bone Density
Chromosomes, Mammalian
Crosses, Genetic
Endothelin-Converting Enzymes
Female
Femur
Male
Metalloendopeptidases
Mice
Mice, Congenic
Phenotype
Quantitative Trait Loci
Sex Chromosomes
Wnt Proteins
