Abstract
The development of the mammalian germ line has been well studied, from the designation of primordial germ cells and their migration in the embryo to their progression through gametogenesis. The pattern of germ cell development, as established through classical studies, is now being overlaid with molecular, genetic and epigenetic data. Eventually, proteonomics will lead to a deeper understanding of the function of these genes. Through knowledge of germ cell gene expression patterns, it is now possible to develop transgenic molecular tools for the isolation of germ cells at different stages of development. By linking stage-specific germ cell promoter regions to the green fluorescent protein (GFP) reporter gene it is possible to tag these cells genetically for histological identification and cell sorting. Our long-term goal is to develop male germ cells as stem cells for therapeutic purposes. It is hoped that this goal will be achieved by purifying germ cells at different stages in development and gaining a deeper understanding of them by studying their gene expression patterns, potency and plasticity, both in vivo and in vitro.
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