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Discovery and refinement of muscle weight QTLs in B6 X D2 advanced intercross mice

Carbonetto, P; Cheng, Riyan; Gyekis, J P; Parker, C C; Blizard, David A; Palmer, A A; Lionikas, Arimantas

Description

The genes underlying variation in skeletal muscle mass are poorly understood. Although many quantitative trait loci (QTLs) have been mapped in crosses of mouse strains, the limited resolution inherent in these conventional studies has made it difficult to reliably pinpoint the causal genetic variants. The accumulated recombination events in an advanced intercross line (AIL), in which mice from two inbred strains are mated at random for several generations, can improve mapping resolution. We...[Show more]

dc.contributor.authorCarbonetto, P
dc.contributor.authorCheng, Riyan
dc.contributor.authorGyekis, J P
dc.contributor.authorParker, C C
dc.contributor.authorBlizard, David A
dc.contributor.authorPalmer, A A
dc.contributor.authorLionikas, Arimantas
dc.date.accessioned2015-12-13T22:30:57Z
dc.identifier.issn1094-8341
dc.identifier.urihttp://hdl.handle.net/1885/75078
dc.description.abstractThe genes underlying variation in skeletal muscle mass are poorly understood. Although many quantitative trait loci (QTLs) have been mapped in crosses of mouse strains, the limited resolution inherent in these conventional studies has made it difficult to reliably pinpoint the causal genetic variants. The accumulated recombination events in an advanced intercross line (AIL), in which mice from two inbred strains are mated at random for several generations, can improve mapping resolution. We demonstrate these advancements in mapping QTLs for hindlimb muscle weights in an AIL (n = 832) of the C57BL/6J (B6) and DBA/2J (D2) strains, generations F8 -F13. We mapped muscle weight QTLs using the high-density MegaMUGA SNP panel. The QTLs highlight the shared genetic architecture of four hindlimb muscles and suggest that the genetic contributions to muscle variation are substantially different in males and females, at least in the B6D2 lineage. Out of the 15 muscle weight QTLs identified in the AIL, nine overlapped the genomic regions discovered in an earlier B6D2 F2 intercross. Mapping resolution, however, was substantially improved in our study to a median QTL interval of 12.5 Mb. Subsequent sequence analysis of the QTL regions revealed 20 genes with nonsense or potentially damaging missense mutations. Further refinement of the muscle weight QTLs using additional functional information, such as gene expression differences between alleles, will be important for discerning the causal genes.
dc.publisherAmerican Physiological Society
dc.sourcePhysiological Genomics
dc.titleDiscovery and refinement of muscle weight QTLs in B6 X D2 advanced intercross mice
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume46
dc.date.issued2014
local.identifier.absfor060412 - Quantitative Genetics (incl. Disease and Trait Mapping Genetics)
local.identifier.ariespublicationU3488905xPUB4456
local.type.statusPublished Version
local.contributor.affiliationCarbonetto, P , University of Chicago
local.contributor.affiliationCheng, Riyan, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationGyekis, J P , Pennsylvania State University
local.contributor.affiliationParker, C C , Middlebury College
local.contributor.affiliationBlizard, David A, Pennsylvania State University
local.contributor.affiliationPalmer, A A , University of Chicago
local.contributor.affiliationLionikas, Arimantas , University of Aberdeen
local.description.embargo2037-12-31
local.bibliographicCitation.issue16
local.bibliographicCitation.startpage571
local.bibliographicCitation.lastpage582
local.identifier.doi10.1152/physiolgenomics.00055.2014
local.identifier.absseo970106 - Expanding Knowledge in the Biological Sciences
dc.date.updated2015-12-11T08:58:06Z
local.identifier.scopusID2-s2.0-84906077788
local.identifier.thomsonID000340830700001
CollectionsANU Research Publications

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