Abstract
Metallothioneins (MTs) are encoded by a multigene family in man. We have isolated those genes and analyzed the structure of some of them. The MT-II variant is encoded by a single functional gene: MT-IIA. The MT-IIB gene is a processed pseudogene derived from a reverse transcript of MT-II mRNA. On the other hand, the MT-I class of variants are encoded by a large number of genes, arranged in tandem. The MT-IIA and the MT-IA genes show a differential response to glucocorticoid hormones and heavy metals, yet they are both expressed in primary human fibroblasts and in HeLa cells. Expression of both of those genes, in high level after transfer on bovine papilloma virus vectors, leads to increased resistance of the host cells to cadmium-induced toxicity.
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