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Expression Of Bacterial Cysteine Biosynthesis Genes In Transgenic Mice And Sheep: Toward A Newin Vivo Amino Acid Biosynthesis Pathway And Improved Wool Growth

C. Bawden, A. V. Sivaprasad, P. Verma, S. K. Walker, G. Rogers
Published 2005 · Medicine, Biology

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It is possible to improve wool growth through increasing the supply of cysteine available for protein synthesis and cell division in the wool follicle. As mammals can only synthesis cysteine indirectly from methionine via trans-sulphuration, expression of transgenes encoding microbial cysteine biosynthesis enzymes could provide a more efficient pathway to cysteine synthesis in the sheep. If expressed in the rumen epithelium, the abundant sulphide, produced by ruminal microorganisms and normally excreted, could be captured for conversion to cysteine. This paper describes the characterisation of expression of the cysteine biosynthesis genes ofSalmonella typhimurium, cysE,cysM andcysK, and linkedcysEM,cysME andcysKE genes as transgenes in mice and sheep. The linked transgenes were constructed with each gene driven by a separate promoter, either with the Rous sarcoma virus long terminal repeat (RSVLTR) promoter or the mouse phosphoglycerate kinase-1 (mPgk-1) promoter, and with human growth hormone (hGH) polyadenylation sequences. Transgenesis of mice with the RSVLTR-cysE gene afforded tissue-specific, heritable expression of the gene. Despite high levels of expression in a number of tissues, extremely low levels of expression occurred in the stomach and small intestine. Results of a concurrent sheep transgenesis experiment using the RSVLTR-cysEM and-cysME linked transgenes revealed that the RSVLTR promoter was inadequate for expression in the rumen. Moreover, instability of transgenes containing the RSVLTR sequence was observed. Expression of mPgk-cysME and-cysKE linked transgenes in most tissues of the mice examined, including the stomach and small intestine, suggested this promoter to be a better candidate for expression of these transgenes in the analogous tissues of sheep. However, a subsequent sheep transgenesis experiment indicated that use of the mPgk-1 promoter, active ubiquitously and early in development, may be inappropriate for expression of the cysteine biosynthesis transgenes. In summary, these results indicate that enzymically active bacterial cysteine biosynthesis gene products can be coexpressed in mammalian cellsin vivo but that expression of the genes should be spatio-temporally restricted to the adult sheep rumen epithelium.
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