Wt10q2^MH
QTL Variant Detail

Summary

• QTL variant: Wt10q2^MH
• Name: body weight, 10 weeks, QTL 2; MH
• MGI ID: MGI:2155593
• QTL: Wt10q2 Location: unknown Genetic Position: Chr3, Syntenic

Variant origin

• Strain of Specimen: MH line

Variant description

• Allele Type: QTL
• Mutation: Undefined
• This allele confers increased body weight at 10 weeks compared to C57BL/6J. (J:55483)
• Inheritance: Not Specified

Expression

In Structures Affected by this Mutation:

1 anatomical structure(s)

Notes

Candidate Genes

J:91835

The correlation between gene expression and dietary interaction was examined in a population of (BALB/cStCrlfC3H/Nctr x VY/WffC3Hf/Nctr-A(vy)/a)F1 animals. A/a and A/A^vy animals were placed on a 70% (calorie restricted) or 100% (non-restricted) diet andliver mRNA levels were assessed for over 18,000 genes using DNA microarrays. Twenty-eight known genes showing statistically significant differential expression between the 70% and 100% calorie diets and A/a and A/A^vy genotypes mapped near known diabesity QTLs. These genes may be considered further for candidate genes.

On mouse Chromosome 3, Hps3 (12.5 cM) showed differential expression between A/a and A/A^vy animals on the unrestricted diet. Diabesity QTL Insq3 (2.6 cM) maps near this candidate gene.Candidate genes for diabesity QTLs Bglq3 (49 cM) and Wt10q2 (61 cM) are Fabp2 (55 cM) and Ampd2 (50.4 cM). Fabp2 shows differential expression between the restricted and unrestricted diets on the A/a background and Ampd2 shows differential expression between the restricted and unrestricted diets on the A/A^vy background.

Mapping and Phenotype information for this QTL, its variants and associated markers

J:55483

Authors used a composite base population from four outbred strains (NIH, ICR, CF-1 and CFW) to select for lines showing a difference in heat loss. After 15 generations of selection, the MH line showed higher heat loss, consumed more feed, were leaner and more active than the ML line of mice. C57BL/6J was chosen as the inbred line to create a resource population from a cross between a selection line and an inbred line. Average heat loss and feed intake of the C57BL/6J mice were similar to that of mice from the ML line but their body composition was similar to the MH line. To identify QTLs that are responsible for heat loss and other phenotypes related to energy balance, a complete genome wide scan was conducted in a (MH x C57BL/6J)F2 intercross (n = 560). Regions harboring QTL with the greatest effects were then evaluated in a (MH x ML)F2 intercross (n = 560). A QTL influencing body weight at 10 weeks, Wt10q2 (LOD = 4.76, 3.8% of residual variance explained) was identified with a peak at 61 cM on Chromosome 3 in the (MH x C57BL/6J)F2 intercross. The MH allele was responsible for increased body weight at 10 weeks for this QTL.

References

• Original: J:55483 Moody DE, et al., Identification of quantitative trait loci influencing traits related to energy balance in selection and inbred lines of mice. Genetics. 1999 Jun;152(2):699-711
• All: 1 reference(s)