Genes and Development

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GENES & DEVELOPMENT 5:38-48, 1991
ISSN 0890-9369
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Research Papers

Germ-line intrachromosomal recombination restores fertility in transgenic MyK-103 male mice.

T M Wilkie, R E Braun, W J Ehrman, R D Palmiter, and R E Hammer

Biology Division, California Institute of Technology, Pasadena 91125.

Abstract

Males of the MyK-103 line of transgenic mice are fertile and sire litters of normal size, but they never transmit the transgene, whereas females transmit the transgene with normal frequency. The chromosome originally bearing the transgene can be transmitted through the male germ line, but only after the transgene is deleted or rearranged by intrachromosomal recombination. The transgene encodes a functional herpes simplex virus (HSV) thymidine kinase gene that causes sperm infertility when expressed in postmeiotic germ cells. Immunocytochemistry revealed clones of germ cells that fail to express HSV thymidine kinase. We postulate that these cells arose by transgene deletion in embryonic germ cells and postnatal spermatogonial stem cells and that they are responsible for the normal fertility of MyK-103 males. The frequency of recombination events at the integration locus suggests that it contains a hotspot for mitotic recombination.


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