A paternally imprinted QTL for mature body mass on mouse Chromosome 8 |
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Authors: | Kellie A Rance Jean-Michel Fustin Gillian Dalgleish Catherine Hambly Lutz Bünger John R Speakman |
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Institution: | (1) Aberdeen Centre for Energy Regulation and Obesity (ACERO), School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK;(2) ACERO, Division of Energy Balance and Obesity, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, AB21 9BS, UK;(3) School of Biological Sciences, Institute of Evolutionary Biology, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JT, UK;(4) Present address: Scottish Agricultural College, Sustainable Livestock Systems Group, Bush Estate, Penicuik, EH26 0PH, UK |
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Abstract: | Body mass (BM) is a classic polygenic trait that has been extensively investigated to determine the underlying genetic architecture.
Many previous studies looking at the genetic basis of variation in BM in murine animal models by quantitative trait loci (QTL)
mapping have used crosses between two inbred lines. As a consequence it has not been possible to explore imprinting effects
which have been shown to play an important role in the genetic basis of early growth with persistent effects throughout the
growth curve. Here we use partially inbred mouse lines to identify QTL for mature BM by applying both Mendelian and Imprinting
models. The analysis of an F2 population (n ≈ 500) identified a number of QTL at 14, 16, and 18 weeks explaining in total 31.5%, 34.4%, and 30.5% of total phenotypic
variation, respectively. On Chromosome 8 a QTL of large effect (14% of the total phenotypic variance at 14 weeks) was found
to be explained by paternal imprinting. Although Chromosome 8 has not been previously associated with imprinting effects,
features of candidate genes within the QTL confidence interval (CpG islands and direct clustered repeats) support the hypothesis
that Insulin receptor substrate 2 may be associated with imprinting, but as yet is unidentified as being so. |
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