Abstract
Leprechaunism and type A diabetes represent inborn errors of insulin resistance whose phenotypes suggested causation by mutations in the insulin receptor gene. Cells cultured from patients with leprechaunism specifically lacked high-affinity insulin binding. Partial but different degrees of impairment were observed in cells cultured from first-degree relatives. Different mutations in the insulin receptor's alpha subunit were proposed in different families (Ark-1, Atl, Minn, Mount Sinai) based on phenotype, cellular insulin binding, and insulin receptor structure. Molecular cloning and sequencing of mutant insulin receptor cDNA from family Ark-1 confirmed that the proband inherited a maternal missense and a paternal nonsense mutation in the alpha subunit and was a compound heterozygote. The insulin receptor was immunologically present on the plasma membrane of fibroblasts cultured from patients Ark-1 and Atl but was markedly reduced in cells from patients Minn and Mount Sinai. In cells from patient Minn, but not from patient Mount Sinai, the decreased number of insulin receptors was associated with reduced insulin receptor mRNA. In two families with the less severe form of insulin resistance, type A diabetes, mutations altered post-translational processing of the insulin receptor molecule. At a cellular level, these mutations of the alpha subunit of the insulin receptor shared defective binding and impaired stimulation of sugar transport by insulin. In family Atl, however, glucose uptake was constitutively increased. Thus, genetic variation in the insulin receptor gene causes a spectrum of inherited insulin-resistant syndromes and altered cellular signaling.
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