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By Elizabeth Corning Dudley

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And Lovell-Badge, R. (1990). Expression of a candidate sex-determining gene during mouse testis differentiation. Nature (London) 348, 450-452. Kreidberg, J. , Loring, J. , and Jaenisch, R. (1993). WT-1 is required for early kidney development. Cell 74, 679-691. , Weller, P. , Guioli, S . Foster, J. , Mansour, S . , Punnett, H. , Dominguez-Steglich, M. , Brook, J. , Young, I. , Goodfellow, P. , and Schafer, A. J. (1995). Mutations in SOX9, the gene responsible for campomelic dysplasia and autosomal sex reversal.

Autosomal sex reversal and campomelic dysplasia are caused by mutations in and around the SRY-related gene SOX9. Cell 79, 11 I I- 1120. Washburn, L. , and Eicher, E. M. (1983). Sex reversal in XY mice caused by dominant mutation on chromosome 17. Nature (London) 303, 338-340. Washbum, L. , and Eicher, E. M. (1989). Normal testis determination in the mouse depends on genetic interaction of locus on chromosome 17 and the Y chromosome. Genetics 123, 173-179. Washbum, L. , Lee, B. , and Eicher, E. M.

For example, it is not known if SP proteins are phosphorylated in vivo before removal but phosphorylation in vitro facilitates their removal (Katagiri and Ohsumi, 1994). In vitro, Bufo sperm chromatin loses its protamines within 1 min in egg extracts (Ohsumi and Katagiri, 1991a). , 1994). The protamine removing activity has been isolated. Oocyte cytosol (but not postneurula or adult cytosol) contains an activity which removes protamines in vitro (Ohsumi and Katagiri, 1991). It purifies as a protein running at 36 kDa on SDS gels which induces decondensation and has been identified as nucleoplasmin, a protein previously characterized as an assembly factor for histones.

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