The IGF2-intron3-G3072A substitution explains a major imprinted QTL effect on backfat thickness in a Meishan x European white pig intercross.
A paternally expressed QTL for muscle growth and backfat thickness (BFT) has previously been identified near the IGF2 locus on the distal tip of pig chromosome 2 (SSC2p) in three experimental F2 populations. Recently, a mutation in a regulatory element of the IGF2 gene was identified as the quantitative trait nucleotide (QTN) underlying the major QTL effect on muscle growth and BFT in crosses between Large White and Wild Boar or Pietrain. This study demonstrates that the IGF2 mutation also controls the paternally expressed QTL for backfat thickness in a cross between Meishan and European Whites. In addition, a comparison of QTL of backfat thickness measured by Hennessy grading probe (HGP) and by ultrasound measurement (USM) was made. In the USM analyses, the IFG2 mutation explains the entire QTL effect on SSC2p, whereas in the HGP analysis the presence of a second minor QTL can not be excluded. Finally, this study shows that this particular IGF2 mutation does not cause the paternally expressed QTL for teat number mapping to the same region of SSC2p as the BFT QTL.
Jungerius
Bart J
BJ
Department of Animal Breeding and Genetics, Wageningen University, P.O. Box 40, 6700 AH Wageningen, The Netherlands. bart.jungerius@wur.nl
van Laere
Anne-Sophie
AS
Te Pas
Marinus F W
MF
van Oost
Bernard A
BA
Andersson
Leif
L
Groenen
Martien A M
MA
D000818:Animals; D001824:Body Constitution / Q000235:genetics; D003433:Crosses, Genetic; D005260:Female; D018392:Genomic Imprinting; D007335:Insulin-Like Growth Factor II / Q000235:genetics* / Q000378:metabolism; D008297:Male; D008321:Mammary Glands, Animal / Q000033:anatomy & histology; D008461:Meat Products; D010641:Phenotype; D017354:Point Mutation; D040641:Quantitative Trait Loci; D013552:Swine / Q000033:anatomy & histology / Q000235:genetics*
D007335:Insulin-Like Growth Factor II