Identification of a new susceptibility locus for insulin-dependent diabetes mellitus by ancestral haplotype congenic mapping.

H Ikegami; S Makino; E Yamato; Y Kawaguchi; H Ueda; T Sakamoto; K Takekawa; T Ogihara

doi:10.1172/JCI118239

Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Department of Geriatric Medicine, Osaka University Medical School, Japan.

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Published in Volume 96, Issue 4 on October 1, 1995
J Clin Invest. 1995;96(4):1936–1942. https://doi.org/10.1172/JCI118239.
© 1995 The American Society for Clinical Investigation

Published October 1, 1995 - Version history

The number and exact locations of the major histocompatibility complex (MHC)-linked diabetogenic genes (Idd-1) are unknown because of strong linkage disequilibrium within the MHC. By using a congenic NOD mouse strain that possesses a recombinant MHC from a diabetes-resistant sister strain, we have now shown that Idd-1 consists of at least two components, one in and one outside the class II A and E regions. A new susceptibility gene (Idd-16) was mapped to the < 11-centiMorgan segment of chromosome 17 adjacent to, but distinct from, previously known Idd-1 candidates, class II A, E, and Tap genes. The coding sequences and splicing donor and acceptor sequences of the Tnfa gene, a candidate gene for Idd-16, were identical in the NOD, CTS, and BALB/c alleles, ruling out amino acid changes in the TNF molecule as a determinant of insulin-dependent diabetes mellitus susceptibility. Our results not only map a new MHC-linked diabetogenic gene(s) but also suggest a new way to fine map disease susceptibility genes within a region where strong linkage disequilibrium exists.

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Identification of a new susceptibility locus for insulin-dependent diabetes mellitus by ancestral haplotype congenic mapping.

H Ikegami, S Makino, E Yamato, Y Kawaguchi, H Ueda, T Sakamoto, K Takekawa, and T Ogihara

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Identification of a new susceptibility locus for insulin-dependent diabetes mellitus by ancestral haplotype congenic mapping.

H Ikegami, S Makino, E Yamato, Y Kawaguchi, H Ueda, T Sakamoto, K Takekawa, and T Ogihara

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