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Candidate genes within known QTL of type 1 diabetes from mouse models


Quantitative trait loci (QTL) are often positioned within large genomic regions that contain dozens to hundreds of genes. It proves difficult to identify underlying genes by direct experiments. Nevertheless, identification of candidate genes by database mining can be productive by defining the size of the subregion around the optimum QTL map position, coupled with q systematic key word search of genetic and published information. Using a recently developed software package, PGMapper [1], a systematic study has been conducted to examine candidate genes of QTL of type 1 diabetes according to all available literature reports in PubMed and Online Mendelian Inheritance in Man (OMIM).

Materials and methods

Literature search was conducted with key words "diabetes" and "QTL" in PubMed for every publication up to December 2007. Candidate gene search was conducted with PGMapper [1]. Genes within a QTL region were obtained from the Ensembl database For every known gene in a QTL, their potential connection with type 1 diabetes was evaluated by searching information from OMIM and PubMed

Results and conclusions

Our search produced some unexpected results. We examined 9038 genes within the interval of 26 QTL of type 1 diabetes, of which 138 genes were considered to be candidate genes for those QTL. On one hand, there are a large number of candidate genes located in each of those QTL; on the other hand, we also found that some obvious candidate genes of QTL have not yet been investigated. Thus, the comprehensive search of candidate genes for known QTL may yield unexpected benefit for identification of responsive genes underlying diabetes QTL. Our search also indicated that genome resources such as Ensembl database and bioinformatics tools such as PGMapper could be great assistance in searching for candidate genes of QTL.


  1. Xiong Q, Qiu Y, Gu W: PGMapper: a web-based tool linking phenotype to genes. Bioinformatics 2008, 24(7):1011–1013. 10.1093/bioinformatics/btn002

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We wish to acknowledge an NIH, National Institute of Arthritis and Musculoskeletal and Skin Diseases, grant AR51190 (To WG).

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Correspondence to Qing Xiong.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Gu, W., Gerling, I., Jiao, Y. et al. Candidate genes within known QTL of type 1 diabetes from mouse models. BMC Bioinformatics 9 (Suppl 7), P2 (2008).

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