RGD Reference Report - Identification of a novel gene for diabetic traits in rats, mice, and humans. - Rat Genome Database

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Identification of a novel gene for diabetic traits in rats, mice, and humans.

Authors: Tsaih, SW  Holl, K  Jia, S  Kaldunski, M  Tschannen, M  He, H  Andrae, JW  Li, SH  Stoddard, A  Wiederhold, A  Parrington, J  Ruas da Silva, M  Galione, A  Meigs, J  Hoffmann, RG  Simpson, P  Jacob, H  Hessner, M  Solberg Woods, LC  Solberg Woods, LC 
Citation: Tsaih SW, etal., Genetics. 2014 Sep;198(1):17-29. doi: 10.1534/genetics.114.162982.
RGD ID: 9587420
Pubmed: PMID:25236446   (View Abstract at PubMed)
PMCID: PMC4174929   (View Article at PubMed Central)
DOI: DOI:10.1534/genetics.114.162982   (Journal Full-text)

The genetic basis of type 2 diabetes remains incompletely defined despite the use of multiple genetic strategies. Multiparental populations such as heterogeneous stocks (HS) facilitate gene discovery by allowing fine mapping to only a few megabases, significantly decreasing the number of potential candidate genes compared to traditional mapping strategies. In the present work, we employed expression and sequence analysis in HS rats (Rattus norvegicus) to identify Tpcn2 as a likely causal gene underlying a 3.1-Mb locus for glucose and insulin levels. Global gene expression analysis on liver identified Tpcn2 as the only gene in the region that is differentially expressed between HS rats with glucose intolerance and those with normal glucose regulation. Tpcn2 also maps as a cis-regulating expression QTL and is negatively correlated with fasting glucose levels. We used founder sequence to identify variants within this region and assessed association between 18 variants and diabetic traits by conducting a mixed-model analysis, accounting for the complex family structure of the HS. We found that two variants were significantly associated with fasting glucose levels, including a nonsynonymous coding variant within Tpcn2. Studies in Tpcn2 knockout mice demonstrated a significant decrease in fasting glucose levels and insulin response to a glucose challenge relative to those in wild-type mice. Finally, we identified variants within Tpcn2 that are associated with fasting insulin in humans. These studies indicate that Tpcn2 is a likely causal gene that may play a role in human diabetes and demonstrate the utility of multiparental populations for positionally cloning genes within complex loci.



Objects referenced in this article
QTL Gluco56 Glucose level QTL 56 Rattus norvegicus
QTL Gluco64 Glucose level QTL 64 Rattus norvegicus
QTL Insul18 Insulin level QTL 18 Rattus norvegicus
QTL Insul19 Insulin level QTL 19 Rattus norvegicus
Strain NMcwi:HS Heterogeneous stock Rattus norvegicus

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